B
B. L. Jensen
Researcher at University of Copenhagen
Publications - 107
Citations - 7375
B. L. Jensen is an academic researcher from University of Copenhagen. The author has contributed to research in topics: Gamma-ray burst & Galaxy. The author has an hindex of 45, co-authored 107 publications receiving 7190 citations. Previous affiliations of B. L. Jensen include Niels Bohr Institute & National Bureau of Investigation.
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Journal ArticleDOI
No supernovae associated with two long-duration gamma ray bursts
Johan P. U. Fynbo,Darach Watson,Christina C. Thöne,Jesper Sollerman,Joshua S. Bloom,Tamara M. Davis,Jens Hjorth,Pall Jakobsson,U. G. Jørgensen,John F. Graham,Andrew S. Fruchter,D. Bersier,Lisa J. Kewley,Arnaud Cassan,José María Castro Cerón,Suzanne Foley,Javier Gorosabel,Tobias C. Hinse,Keith Horne,B. L. Jensen,Sylvio Klose,Daniel Kocevski,J. B. Marquette,Daniel A. Perley,Enrico Ramirez-Ruiz,Enrico Ramirez-Ruiz,Maximilian Stritzinger,Paul Vreeswijk,Paul Vreeswijk,Ralph A. M. J. Wijers,K. Woller,Dong Xu,M. Zub +32 more
TL;DR: Zhang et al. as discussed by the authors reported that GRB 060614 was not accompanied by supernova emission down to limits hundreds of times fainter than the archetypal supernova SN 1998bw that accompanied GRB 980425, and faintter than any type Ic supernova ever observed.
Journal ArticleDOI
Low-resolution Spectroscopy of Gamma-ray Burst Optical Afterglows: Biases in the Swift Sample and Characterization of the Absorbers
Johan P. U. Fynbo,Johan P. U. Fynbo,Pall Jakobsson,Jason X. Prochaska,D. Malesani,C. Ledoux,A. de Ugarte Postigo,Marco Nardini,P. M. Vreeswijk,P. M. Vreeswijk,Klaas Wiersema,Jens Hjorth,Jesper Sollerman,Jesper Sollerman,Hsiao-Wen Chen,Christina C. Thöne,Christina C. Thöne,Gunnlaugur Björnsson,Joshua S. Bloom,A. J. Castro-Tirado,Lise Christensen,A. De Cia,A. S. Fruchter,Javier Gorosabel,John F. Graham,Andreas O. Jaunsen,Andreas O. Jaunsen,B. L. Jensen,D. A. Kann,Chryssa Kouveliotou,Andrew J. Levan,Justyn R. Maund,N. Masetti,Bo Milvang-Jensen,Eliana Palazzi,Daniel A. Perley,Elena Pian,Evert Rol,Patricia Schady,R. L. C. Starling,Nial R. Tanvir,Darach Watson,Dong Xu,T. Augusteijn,Frank Grundahl,J. H. Telting,P. O. Quirion +46 more
TL;DR: In this article, the authors presented a sample of 77 optical afterglows (OAs) of Swift detected gamma-ray bursts (GRBs) for which spectroscopic follow-up observations have been secured.
Journal ArticleDOI
Low-Resolution Spectroscopy of Gamma-ray Burst Optical Afterglows: Biases in the Swift Sample and Characterization of the Absorbers
Johan P. U. Fynbo,Pall Jakobsson,Jason X. Prochaska,D. Malesani,C. Ledoux,A. de Ugarte Postigo,Marco Nardini,P. M. Vreeswijk,Klaas Wiersema,Jens Hjorth,Jesper Sollerman,Hsiao-Wen Chen,C. C. Thoene,G. Bjoernsson,Joshua S. Bloom,A. J. Castro-Tirado,Lise Christensen,A. De Cia,A. S. Fruchter,J. Gorosabel,J. F. Graham,Andreas O. Jaunsen,B. L. Jensen,D. A. Kann,Chryssa Kouveliotou,Andrew J. Levan,Justyn R. Maund,N. Masetti,B. Milvang-Jensen,Eliana Palazzi,Daniel A. Perley,Elena Pian,E. Rol,Patricia Schady,R. L. C. Starling,Nial R. Tanvir,Darach Watson,Da Xu,T. Augusteijn,Frank Grundahl,J. H. Telting,P. O. Quirion +41 more
TL;DR: In this paper, the authors presented a sample of 77 optical afterglows (OAs) of Swift detected GRBs for which spectroscopic follow-up observations have been secured.
Journal ArticleDOI
No supernovae from two nearby long gamma ray bursts
Johan P. U. Fynbo,Darach Watson,C. C. Thoene,Jesper Sollerman,Joshua S. Bloom,Tamara M. Davis,Jens Hjorth,Pall Jakobsson,U. G. Joergensen,John F. Graham,Andrew S. Fruchter,D. Bersier,Lisa J. Kewley,Arnaud Cassan,José María Castro Cerón,Suzanne Foley,Javier Gorosabel,Tobias C. Hinse,Keith Horne,B. L. Jensen,Sylvio Klose,Daniel Kocevski,J. B. Marquette,Daniel A. Perley,Enrico Ramirez-Ruiz,Maximilian Stritzinger,Paul Vreeswijk,Ralph A. M. J. Wijers,K. Woller,Dong Xu,M. Zub +30 more
TL;DR: In this article, the authors present observations of two nearby long-duration gamma-ray bursts (GRBs) that challenge this simple view, and demonstrate that no SN emission accompanied these longduration bursts, down to limits hundreds of times fainter than the archetypal SN 1998bw that accompanied GRB 980425, and faintter than any Type Ic SN ever observed.
Journal ArticleDOI
The Afterglows of Swift-era Gamma-ray Bursts. I. Comparing pre-Swift and Swift-era Long/Soft (Type II) GRB Optical Afterglows
David Alexander Kann,Sylvio Klose,Bing Zhang,D. B. Malesani,Ehud Nakar,Ehud Nakar,A. Pozanenko,A. C. Wilson,Nathaniel R. Butler,Pall Jakobsson,Pall Jakobsson,Steve Schulze,Maksim V. Andreev,L. A. Antonelli,I. F. Bikmaev,V. Biryukov,Markus Böttcher,R. A. Burenin,J. M. Castro Cerón,J. M. Castro Cerón,A. J. Castro-Tirado,G. Chincarini,G. Chincarini,B. E. Cobb,B. E. Cobb,Stefano Covino,P. D'Avanzo,Valerio D'Elia,M. Della Valle,M. Della Valle,A. de Ugarte Postigo,Yu. S. Efimov,P. Ferrero,Dino Fugazza,Johan P. U. Fynbo,M. Gålfalk,F. Grundahl,Javier Gorosabel,S. Gupta,Sergei Guziy,B. M. Hafizov,Jens Hjorth,K. Holhjem,Mansur Ibrahimov,Myungshin Im,G. L. Israel,M. Jeĺinek,B. L. Jensen,R. Karimov,Irek Khamitov,Ü. Kızıloǧlu,E. Klunko,Petr Kubánek,Alexander Kutyrev,Peter Laursen,Andrew J. Levan,Filippo Mannucci,C. M. Martin,A. Mescheryakov,Nestor Mirabal,Jay P. Norris,J. E. Ovaldsen,D. Paraficz,Elena P. Pavlenko,Silvia Piranomonte,Andrea Rossi,Vasilij Rumyantsev,R. Salinas,A. Sergeev,D. Sharapov,Jesper Sollerman,Jesper Sollerman,Bringfried Stecklum,Luigi Stella,Gianpiero Tagliaferri,Nial R. Tanvir,J. Telting,Vincenzo Testa,Adria C. Updike,A. Volnova,Darach Watson,Klaas Wiersema,Klaas Wiersema,Dong Xu +83 more
TL;DR: The first indications of a class of long GRBs are presented, which form a bridge between the typical high-luminosity, high-redshift events and nearby low- luminosity events (which are also associated with spectroscopic supernovae) in terms of energetics and observed redshift distribution, indicating a continuous distribution overall.