J
John F. Graham
Researcher at Max Planck Society
Publications - 32
Citations - 2281
John F. Graham is an academic researcher from Max Planck Society. The author has contributed to research in topics: Gamma-ray burst & Galaxy. The author has an hindex of 18, co-authored 32 publications receiving 2183 citations. Previous affiliations of John F. Graham include Space Telescope Science Institute.
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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
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
A High-metallicity Host Environment for the Long-duration GRB 020819
TL;DR: In this paper, the authors present spectroscopic observations of the host galaxy and explosion site of long-duration gamma-ray burst GRB 020819 and determine a metallicity for this host environment of log(O/H) + 12 = 9.0 {+-} 0.1.
Journal ArticleDOI
Star formation in the early universe: Beyond the tip of the iceberg
Nial R. Tanvir,Andrew J. Levan,A. S. Fruchter,Johan P. U. Fynbo,Jens Hjorth,Klaas Wiersema,Malcolm N. Bremer,James E. Rhoads,Pall Jakobsson,P. T. O'Brien,Elizabeth R. Stanway,D. Bersier,Priyamvada Natarajan,Priyamvada Natarajan,Jochen Greiner,Darach Watson,A. J. Castro-Tirado,Ralph A. M. J. Wijers,R. L. C. Starling,Kuntal Misra,John F. Graham,Chryssa Kouveliotou +21 more
TL;DR: In this article, the authors used very deep observations of the field of the most distant spectroscopically confirmed burst, GRB 090423, at z = 8.2.