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  1. Article ; Online: Improved Hydrophobicity of Macroalgae Biopolymer Film Incorporated with Kenaf Derived CNF Using Silane Coupling Agent

    Adeleke A. Oyekanmi / N. I. Saharudin / Che Mohamad Hazwan / Abdul Khalil H. P. S. / Niyi G. Olaiya / Che K. Abdullah / Tata Alfatah / Deepu A. Gopakumar / Daniel Pasquini

    Molecules, Vol 26, Iss 2254, p

    2021  Volume 2254

    Abstract: Hydrophilic behaviour of carrageenan macroalgae biopolymer, due to hydroxyl groups, has limited its applications, especially for packaging. In this study, macroalgae were reinforced with cellulose nanofibrils (CNFs) isolated from kenaf bast fibres. The ... ...

    Abstract Hydrophilic behaviour of carrageenan macroalgae biopolymer, due to hydroxyl groups, has limited its applications, especially for packaging. In this study, macroalgae were reinforced with cellulose nanofibrils (CNFs) isolated from kenaf bast fibres. The macroalgae CNF film was after that treated with silane for hydrophobicity enhancement. The wettability and functional properties of unmodified macroalgae CNF films were compared with silane-modified macroalgae CNF films. Characterisation of the unmodified and modified biopolymers films was investigated. The atomic force microscope (AFM), SEM morphology, tensile properties, water contact angle, and thermal behaviour of the biofilms showed that the incorporation of Kenaf bast CNF remarkably increased the strength, moisture resistance, and thermal stability of the macroalgae biopolymer films. Moreover, the films’ modification using a silane coupling agent further enhanced the strength and thermal stability of the films apart from improved water-resistance of the biopolymer films compared to unmodified films. The morphology and AFM showed good interfacial interaction of the components of the biopolymer films. The modified biopolymer films exhibited significantly improved hydrophobic properties compared to the unmodified films due to the enhanced dispersion resulting from the silane treatment. The improved biopolymer films can potentially be utilised as packaging materials.
    Keywords macroalgae ; kenaf fibre ; silane treatment ; hydrophilicity ; nanocellulose ; reinforcement ; Organic chemistry ; QD241-441
    Subject code 620
    Language English
    Publishing date 2021-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: A Review on Plant Cellulose Nanofibre-Based Aerogels for Biomedical Applications

    H.P.S. Abdul Khalil / A.S. Adnan / Esam Bashir Yahya / N.G. Olaiya / Safrida Safrida / Md. Sohrab Hossain / Venugopal Balakrishnan / Deepu A. Gopakumar / C.K. Abdullah / A.A. Oyekanmi / Daniel Pasquini

    Polymers, Vol 12, Iss 1759, p

    2020  Volume 1759

    Abstract: Cellulose nanomaterials from plant fibre provide various potential applications (i.e., biomedical, automotive, packaging, etc.). The biomedical application of nanocellulose isolated from plant fibre, which is a carbohydrate-based source, is very viable ... ...

    Abstract Cellulose nanomaterials from plant fibre provide various potential applications (i.e., biomedical, automotive, packaging, etc.). The biomedical application of nanocellulose isolated from plant fibre, which is a carbohydrate-based source, is very viable in the 21st century. The essential characteristics of plant fibre-based nanocellulose, which include its molecular, tensile and mechanical properties, as well as its biodegradability potential, have been widely explored for functional materials in the preparation of aerogel. Plant cellulose nano fibre (CNF)-based aerogels are novel functional materials that have attracted remarkable interest. In recent years, CNF aerogel has been extensively used in the biomedical field due to its biocompatibility, renewability and biodegradability. The effective surface area of CNFs influences broad applications in biological and medical studies such as sustainable antibiotic delivery for wound healing, the preparation of scaffolds for tissue cultures, the development of drug delivery systems, biosensing and an antimicrobial film for wound healing. Many researchers have a growing interest in using CNF-based aerogels in the mentioned applications. The application of cellulose-based materials is widely reported in the literature. However, only a few studies discuss the potential of cellulose nanofibre aerogel in detail. The potential applications of CNF aerogel include composites, organic–inorganic hybrids, gels, foams, aerogels/xerogels, coatings and nano-paper, bioactive and wound dressing materials and bioconversion. The potential applications of CNF have rarely been a subject of extensive review. Thus, extensive studies to develop materials with cheaper and better properties, high prospects and effectiveness for many applications are the focus of the present work. The present review focuses on the evolution of aerogels via characterisation studies on the isolation of CNF-based aerogels. The study concludes with a description of the potential and challenges of developing sustainable materials for biomedical applications.
    Keywords cellulose ; nanofibre ; aerogel ; sustainable ; biomedical applications ; Organic chemistry ; QD241-441
    Subject code 621
    Language English
    Publishing date 2020-08-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: The role of silica-containing agro-industrial waste as reinforcement on physicochemical and thermal properties of polymer composites

    Samsul Rizal / H.M. Fizree / Md. Sohrab Hossain / Ikramullah / Deepu A. Gopakumar / Eunice Chong Wan Ni / H.P.S. Abdul Khalil

    Heliyon, Vol 6, Iss 3, Pp e03550- (2020)

    2020  

    Abstract: This study was conducted to determine the influence of the oil palm boiler ash (OPBA) reinforcement on the microstructural, physical, mechanical and thermal properties of epoxy polymer composites. The chemical composition analysis of OPBA revealed that ... ...

    Abstract This study was conducted to determine the influence of the oil palm boiler ash (OPBA) reinforcement on the microstructural, physical, mechanical and thermal properties of epoxy polymer composites. The chemical composition analysis of OPBA revealed that it contains about 55 wt.% of SiO2 along with other metallic oxides and elements. The surface morphology of OPBA showed angular and irregular shapes with porous structures. The influence of OPBA as a reinforcement in epoxy composite was studied with varying filler loadings (10–50 wt.%) and different particle sizes (50–150 μm). The result showed that the incorporation of OPBA in composites has improved the physical, mechanical and thermal properties of the epoxy matrix. The highest physical and mechanical properties of fabricated composites were attained with 30 wt.% loading and size of 50 μm. Also, thermal stability and the percentage of char residue of the composite increased with increasing filler loading. Furthermore, the contact angle of OPBA reinforced epoxy composites increased with the increase of filler loading. The lowest value of the contact angle was obtained at 30 wt.% of filler loading with the OPBA particle size of 50 μm. The finding of this study reveals that the OPBA has the potential to be used as reinforcement or filler as well as an alternative of silica-based inorganic fillers used in the enhancement of mechanical, physical and thermal properties of the epoxy polymer composite.
    Keywords Materials science ; Agro-industrial waste ; Inorganic SiO2 ; Oil palm boiler ash ; Micro filler ; Epoxy composites ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
    Subject code 620
    Language English
    Publishing date 2020-03-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Enhancement in the Physico-Mechanical Functions of Seaweed Biopolymer Film via Embedding Fillers for Plasticulture Application—A Comparison with Conventional Biodegradable Mulch Film

    Hasan M / E.W.N. Chong / Shima Jafarzadeh / M.T. Paridah / Deepu A. Gopakumar / H.A. Tajarudin / Sabu Thomas / H.P.S. Abdul Khalil

    Polymers, Vol 11, Iss 2, p

    2019  Volume 210

    Abstract: This study aimed to compare the performance of fabricated microbially induced precipitated calcium carbonate– (MB–CaCO 3 ) based red seaweed ( Kappaphycus alvarezii ) bio-polymer film and commercial calcium carbonate– (C–CaCO 3 ) based red seaweed bio- ... ...

    Abstract This study aimed to compare the performance of fabricated microbially induced precipitated calcium carbonate– (MB–CaCO 3 ) based red seaweed ( Kappaphycus alvarezii ) bio-polymer film and commercial calcium carbonate– (C–CaCO 3 ) based red seaweed bio-film with the conventional biodegradable mulch film. To the best of our knowledge, there has been limited research on the application of commercial CaCO 3 (C–CaCO 3 ) and microbially induced CaCO 3 (MB–CaCO 3 ) as fillers for the preparation of films from seaweed bio-polymer and comparison with biodegradable commercial plasticulture packaging. The results revealed that the mechanical, contact angle, and biodegradability properties of the polymer composite films incorporated with C–CaCO 3 and MB–CaCO 3 fillers were comparable or even superior than the conventional biodegradable mulch film. The seaweed polymer film incorporated with MB–CaCO 3 showed the highest contact angle of 100.94°, whereas conventional biodegradable mulch film showed a contact angle of 90.25°. The enhanced contact angle of MB–CaCO 3 resulted in high barrier properties, which is highly desired in the current scenario for plasticulture packaging application. The water vapor permeability of MB–CaCO 3 based seaweed films was low (2.05 ± 1.06 g·m/m 2 ·s·Pa) when compared to conventional mulch film (2.68 ± 0.35 g·m/m 2 ·s·Pa), which makes the fabricated film an ideal candidate for plasticulture application. The highest tensile strength (TS) was achieved by seaweed-based film filled with commercial CaCO 3 (84.92% higher than conventional mulch film). SEM images of the fractured surfaces of the fabricated films revealed the strong interaction between seaweed and fillers. Furthermore, composite films incorporated with MB–CaCO 3 promote brighter film, better water barrier, hydrophobicity, and biodegradability compared to C–CaCO 3 based seaweed polymer film and conventional mulch film. From this demonstrated work, it can be concluded that the fabricated MB–CaCO 3 based seaweed biopolymer film will be a ...
    Keywords bio-degradable polymer film ; seaweed polymer ; plasticulture application ; conventional film ; calcium carbonate ; Organic chemistry ; QD241-441
    Subject code 290
    Language English
    Publishing date 2019-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Robust Superhydrophobic Cellulose Nanofiber Aerogel for Multifunctional Environmental Applications

    Hasan. M. / Deepu A. Gopakumar / Vishnu Arumughan / Yasir Beeran Pottathara / Sisanth K. S. / Daniel Pasquini / Matej Bračič / Bastien Seantier / Ange Nzihou / Sabu Thomas / Samsul Rizal / Abdul Khalil H. P. S.

    Polymers, Vol 11, Iss 3, p

    2019  Volume 495

    Abstract: The fabrication of superadsorbent for dye adsorption is a hot research area at present. However, the development of low-cost and highly efficient superadsorbents against toxic textile dyes is still a big challenge. Here, we fabricated hydrophobic ... ...

    Abstract The fabrication of superadsorbent for dye adsorption is a hot research area at present. However, the development of low-cost and highly efficient superadsorbents against toxic textile dyes is still a big challenge. Here, we fabricated hydrophobic cellulose nanofiber aerogels from cellulose nanofibers through an eco-friendly silanization reaction in liquid phase, which is an extremely efficient, rapid, cheap, and environmentally friendly procedure. Moreover, the demonstrated eco-friendly silanization technique is easy to commercialize at the industrial level. Most of the works that have reported on the hydrophobic cellulose nanofiber aerogels explored their use for the elimination of oil from water. The key novelty of the present work is that the demonstrated hydrophobic cellulose nanofibers aerogels could serve as superadsorbents against toxic textile dyes such as crystal violet dye from water and insulating materials for building applications. Here, we make use of the possible hydrophobic interactions between silane-modified cellulose nanofiber aerogel and crystal violet dye for the removal of the crystal violet dye from water. With a 10 mg/L of crystal violet (CV) aqueous solution, the silane-modified cellulose nanofiber aerogel showed a high adsorption capacity value of 150 mg/g of the aerogel. The reason for this adsorption value was due to the short-range hydrophobic interaction between the silane-modified cellulose nanofiber aerogel and the hydrophobic domains in crystal violet dye molecules. Additionally, the fabricated silane-modified cellulose nanofiber hydrophobic aerogels exhibited a lower thermal conductivity value of 0.037 W·m−1 K−1, which was comparable to and lower than the commercial insulators such as mineral wools (0.040 W·m−1 K−1) and polystyrene foams (0.035 W·m−1 K−1). We firmly believe that the demonstrated silane-modified cellulose nanofiber aerogel could yield an eco-friendly adsorbent that is agreeable to adsorbing toxic crystal violet dyes from water as well as active building thermal ...
    Keywords cellulose nanofiber aerogels ; silane modification ; dye removal ; thermal insulators ; Organic chemistry ; QD241-441
    Subject code 660
    Language English
    Publishing date 2019-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Extraction of Cellulose Nanofibers via Eco-friendly Supercritical Carbon Dioxide Treatment Followed by Mild Acid Hydrolysis and the Fabrication of Cellulose Nanopapers

    M. S. Nurul Atiqah / Deepu A. Gopakumar / Owolabi F. A. T. / Yasir Beeran Pottathara / Samsul Rizal / N. A. Sri Aprilia / D. Hermawan / M. T. T. Paridah / Sabu Thomas / Abdul Khalil H. P. S.

    Polymers, Vol 11, Iss 11, p

    2019  Volume 1813

    Abstract: The conventional isolation of cellulose nanofibers (CNFs) process involves high energy input which leads to compromising the pulp fiber’s physical and chemical properties, in addition to the issue of elemental chlorine-based bleaching, which is ... ...

    Abstract The conventional isolation of cellulose nanofibers (CNFs) process involves high energy input which leads to compromising the pulp fiber’s physical and chemical properties, in addition to the issue of elemental chlorine-based bleaching, which is associated with serious environmental issues. This study investigates the characteristic functional properties of CNFs extracted via total chlorine-free (TCF) bleached kenaf fiber followed by an eco-friendly supercritical carbon dioxide (SC-CO 2 ) treatment process. The Fourier transmission infra-red FTIR spectra result gave remarkable effective delignification of the kenaf fiber as the treatment progressed. TEM images showed that the extracted CNFs have a diameter in the range of 10−15 nm and length of up to several micrometers, and thereby proved that the supercritical carbon dioxide pretreatment followed by mild acid hydrolysis is an efficient technique to extract CNFs from the plant biomass. XRD analysis revealed that crystallinity of the fiber was enhanced after each treatment and the obtained crystallinity index of the raw fiber, alkali treated fiber, bleached fiber, and cellulose nanofiber were 33.2%, 54.6%, 88.4%, and 92.8% respectively. SEM images showed that amorphous portions like hemicellulose and lignin were removed completely after the alkali and bleaching treatment, respectively. Moreover, we fabricated a series of cellulose nanopapers using the extracted CNFs suspension via a simple vacuum filtration technique. The fabricated cellulose nanopaper exhibited a good tensile strength of 75.7 MPa at 2.45% strain.
    Keywords kenaf fiber ; total chlorine free bleaching ; supercritical carbon dioxide ; cellulose nanofibers ; cellulose nanopaper ; Organic chemistry ; QD241-441
    Subject code 660
    Language English
    Publishing date 2019-11-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article: Revalorization of sunflower stalks as novel sources of cellulose nanofibrils and nanocrystals and their effect on wheat gluten bionanocomposite properties

    Fortunati, E / A. Chiralt / A. Jiménez / D. Puglia / D.A. Gopakumar / F. Luzi / J.M. Kenny / L. Torre / S. Thomas

    Carbohydrate polymers. 2016 Sept. 20, v. 149

    2016  

    Abstract: Novel gluten based bionanocomposites reinforced with cellulose nanofibrils (CNF) and cellulose nanocrystals (CNC) extracted from sunflower stalks by respectively a steam explosion treatment and a hydrolysis procedure, were prepared by casting/evaporation. ...

    Abstract Novel gluten based bionanocomposites reinforced with cellulose nanofibrils (CNF) and cellulose nanocrystals (CNC) extracted from sunflower stalks by respectively a steam explosion treatment and a hydrolysis procedure, were prepared by casting/evaporation. The extracted cellulose nanomaterials, both CNC and CNF, were embedded in gluten matrix and their effect was investigated. Morphological investigations highlighted that gluten based bionanocomposites showed a homogenous morphology, the absence of visible cellulose nanoreinforcements, and the presence of holes for Gluten_CNF nanocomposites. Gluten_CNF showed a reduction of water vapour permeability coefficients but the values are higher respect to gluten reinforced with CNC. This behaviour could be related to the ability of CNC to increase the tortuous path of gas molecules. Moreover, the results from thermal, mechanical and barrier properties confirmed the strong interactions obtained between CNC and gluten matrix during the process.The study suggested the possibility to re-valorise agricultural wastes with potential applications as reinforcement in polymer matrix bionanocomposites.
    Keywords agricultural wastes ; cellulose ; cellulosic fibers ; evaporation ; Helianthus annuus ; hydrolysis ; nanocomposites ; nanocrystals ; permeability ; polymers ; water vapor ; wheat gluten
    Language English
    Dates of publication 2016-0920
    Size p. 357-368.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1501516-6
    ISSN 1879-1344 ; 0144-8617
    ISSN (online) 1879-1344
    ISSN 0144-8617
    DOI 10.1016/j.carbpol.2016.04.120
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: A Search for QPOs in the Blazar OJ287

    S. Zola / M. Valtonen / G. Bhatta / A. Goyal / B. Debski / A. Baran / J. Krzesinski / M. Siwak / S. Ciprini / A. Gopakumar / H. Jermak / K. Nilsson / D. Reichart / K. Matsumoto / K. Sadakane / K. Gazeas / M. Kidger / V. Piirola / F. Alicavus /
    K. S. Baliyan / A. Berdyugin / D. Boyd / M. Campas Torrent / F. Campos / J. Carrillo Gómez / D. B. Caton / V. Chavushyan / J. Dalessio / D. Dimitrov / M. Drozdz / H. Er / A. Erdem / A. Escartin Pérez / V. Fallah Ramazani / A. V. Filippenko / F. Garcia / F. Gómez Pinilla / M. Gopinathan / J. B. Haislip / J. Harmanen / R. Hudec / G. Hurst / K. M. Ivarsen / M. Jelinek / A. Joshi / M. Kagitani / N. Kaur / W. C. Keel / A. P. LaCluyze / B. C. Lee / E. Lindfors / J. Lozano de Haro / J. P. Moore / M. Mugrauer / R. Naves Nogues / A. W. Neely / R. H. Nelson / W. Ogloza / S. Okano / J. C. Pandey / M. Perri / P. Pihajoki / G. Poyner / J. Provencal / T. Pursimo / A. Raj / R. Reinthal / S. Sadegi / T. Sakanoi / Sameer / J.-L. Salto González / T. Schweyer / F. C. Soldán Alfaro / N. Karaman / E. Sonbas / I. Steele / J. T. Stocke / J. Strobl / L. O. Takalo / T. Tomov / L. Tremosa Espasa / J. R. Valdes / J. Valero Pérez / F. Verrecchia / J. R. Webb / M. Yoneda / M. Zejmo / W. Zheng / J. Telting / J. Saario / T. Reynolds / A. Kvammen / E. Gafton / R. Karjalainen / P. Blay

    Galaxies, Vol 4, Iss 4, p

    Preliminary Results from the 2015/2016 Observing Campaign

    2016  Volume 41

    Abstract: We analyse the light curve in the R band of the blazar OJ287, gathered during the 2015/2016 observing season. We did a search for quasi-periodic oscillations (QPOs) using several methods over a wide range of timescales. No statistically significant ... ...

    Abstract We analyse the light curve in the R band of the blazar OJ287, gathered during the 2015/2016 observing season. We did a search for quasi-periodic oscillations (QPOs) using several methods over a wide range of timescales. No statistically significant periods were found in the high-frequency domain both in the ground-based data and in Kepler observations. In the longer-period domain, the Lomb–Scargle periodogram revealed several peaks above the 99% significance level. The longest one—about 95 days—corresponds to the innermost stable circular orbit (ISCO) period of the more massive black hole. The 43-day period could be an alias, or it can be attributed to accretion in the form of a two-armed spiral wave.
    Keywords galaxies: active ; BL Lacertae objects: individual (OJ287) ; supermassive black holes ; Science ; Q ; Astronomy ; QB1-991
    Language English
    Publishing date 2016-10-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article: Search for Gravitational Waves Associated with Gamma-Ray Bursts Detected by Fermi and Swift During the LIGO-Virgo Run O3a

    Collaboration, The LIGO Scientific / R.Abbott, the Virgo Collaboration / T.D.Abbott, / S.Abraham, / F.Acernese, / K.Ackley, / C.Adams, / R.X.Adhikari, / V.B.Adya, / C.Affeldt, / M.Agathos, / K.Agatsuma, / N.Aggarwal, / O.D.Aguiar, / A.Aich, / L.Aiello, / A.Ain, / P.Ajith, / G.Allen, /
    A.Allocca, / P.A.Altin, / A.Amato, / S.Anand, / A.Ananyeva, / S.B.Anderson, / W.G.Anderson, / S.V.Angelova, / S.Ansoldi, / S.Antier, / S.Appert, / K.Arai, / M.C.Araya, / J.S.Areeda, / M.Arene, / N.Arnaud, / S.M.Aronson, / Y.Asali, / S.Ascenzi, / G.Ashton, / M.Assiduo, / S.M.Aston, / P.Astone, / F.Aubin, / P.Aufmuth, / K.AultONeal, / C.Austin, / V.Avendano, / S.Babak, / P.Bacon, / F.Badaracco, / M.K.M.Bader, / S.Bae, / A.M.Baer, / J.Baird, / F.Baldaccini, / G.Ballardin, / S.W.Ballmer, / A.Bals, / A.Balsamo, / G.Baltus, / S.Banagiri, / D.Bankar, / R.S.Bankar, / J.C.Barayoga, / C.Barbieri, / B.C.Barish, / D.Barker, / K.Barkett, / P.Barneo, / F.Barone, / B.Barr, / L.Barsotti, / M.Barsuglia, / D.Barta, / J.Bartlett, / I.Bartos, / R.Bassiri, / A.Basti, / M.Bawaj, / J.C.Bayley, / M.Bazzan, / B.B'ecsy, / M.Bejger, / I.Belahcene, / A.S.Bell, / D.Beniwal, / M.G.Benjamin, / J.D.Bentley, / F.Bergamin, / B.K.Berger, / G.Bergmann, / S.Bernuzzi, / C.P.L.Berry, / D.Bersanetti, / A.Bertolini, / J.Betzwieser, / R.Bhandare, / A.V.Bhandari, / A.Bianchi, / J.Bidler, / E.Biggs, / I.A.Bilenko, / G.Billingsley, / R.Birney, / O.Birnholtz, / S.Biscans, / M.Bischi, / S.Biscoveanu, / A.Bisht, / G.Bissenbayeva, / M.Bitossi, / M.A.Bizouard, / J.K.Blackburn, / J.Blackman, / C.D.Blair, / D.G.Blair, / R.M.Blair, / F.Bobba, / N.Bode, / M.Boer, / Y.Boetzel, / G.Bogaert, / F.Bondu, / E.Bonilla, / R.Bonnand, / P.Booker, / B.A.Boom, / R.Bork, / V.Boschi, / S.Bose, / V.Bossilkov, / J.Bosveld, / Y.Bouffanais, / A.Bozzi, / C.Bradaschia, / P.R.Brady, / A.Bramley, / M.Branchesi, / J.E.Brau, / M.Breschi, / T.Briant, / J.H.Briggs, / F.Brighenti, / A.Brillet, / M.Brinkmann, / P.Brockill, / A.F.Brooks, / J.Brooks, / D.D.Brown, / S.Brunett, / G.Bruno, / R.Bruntz, / A.Buikema, / T.Bulik, / H.J.Bulten, / A.Buonanno, / D.Buskulic, / R.L.Byer, / M.Cabero, / L.Cadonati, / G.Cagnoli, / C.Cahillane, / Bustillo, J.Calder'on / J.D.Callaghan, / T.A.Callister, / E.Calloni, / J.B.Camp, / M.Canepa, / Santoro, G.Caneva 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    Abstract: We search for gravitational-wave transients associated with gamma-ray bursts detected by the Fermi and Swift satellites during the first part of the third observing run of Advanced LIGO and Advanced Virgo (1 April 2019 15:00 UTC - 1 October 2019 15:00 ... ...

    Abstract We search for gravitational-wave transients associated with gamma-ray bursts detected by the Fermi and Swift satellites during the first part of the third observing run of Advanced LIGO and Advanced Virgo (1 April 2019 15:00 UTC - 1 October 2019 15:00 UTC). 105 gamma-ray bursts were analyzed using a search for generic gravitational-wave transients; 32 gamma-ray bursts were analyzed with a search that specifically targets neutron star binary mergers as short gamma-ray burst progenitors. We describe a method to calculate the probability that triggers from the binary merger targeted search are astrophysical and apply that method to the most significant gamma-ray bursts in that search. We find no significant evidence for gravitational-wave signals associated with the gamma-ray bursts that we followed up, nor for a population of unidentified subthreshold signals. We consider several source types and signal morphologies, and report for these lower bounds on the distance to each gamma-ray burst.
    Keywords covid19
    Publisher ArXiv
    Document type Article
    Database COVID19

    Kategorien

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