Greiner, J. and Clemens, C. and Krühler, T. and von-Kienlin, A. and Rau, A. and Sari, R. and Fox, D. B. and Kawai, N. and Afonso, P. and Ajello, M. and Berger, E. and Cenko, S. B. and Cucchiara, A. and Filgas, R. and Klose, S. and Küpcü-Yoldaş, A. and Lichti, G. G. and Löw, S. and McBreen, S. and Nagayama, T. and Rossi, A. and Sato, S. and Szokoly, G. and Yoldaş, A. and Zhang, X.-L. (2009) The redshift and afterglow of the extremely energetic gamma-ray burst GRB 080916C. Astronomy and Astrophysics, 498 (1). pp. 89-94. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20090828-080524923
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Context. The detection of GeV photons from gamma-ray bursts (GRBs) has important consequences for the interpretation and modelling of these most-energetic cosmological explosions. The full exploitation of the high-energy measurements relies, however, on accurate knowledge of the distance to the events. Aims. Here we report on the discovery of the afterglow and subsequent redshift determination of GRB 080916C, the first GRB detected by the Fermi Gamma-Ray Space Telescope with high significance detection of photons at energies >0.1 GeV. Methods. Observations were done with the 7-channel “Gamma-Ray Optical and Near-infrared Detector” (GROND) at the 2.2 m MPI/ESO telescope, the SIRIUS instrument at the Nagoya-SAAO 1.4 m telescope in South Africa, and the GMOS instrument at Gemini-S. Results. The afterglow photometric redshift of , based on simultaneous 7-filter observations with GROND, places GRB 080916C among the top 5% most distant GRBs and makes it the most energetic GRB known to date. The detection of GeV photons from such a distant event is unexpected because of the predicted opacity due to interaction with the extragalactic background light. The observed gamma-ray variability in the prompt emission, together with the redshift, suggests a lower limit for the Lorentz factor of the ultra-relativistic ejecta of . This value rivals any previous measurements of in GRBs and strengthens the extreme nature of GRB 080916C.
|Additional Information:||© 2009 ESO. Received 22 December 2008. Accepted 7 February 2009. T.K. acknowledges support by the DFG cluster of excellence “Origin and Structure of the Universe”. Part of the funding for GROND (both hardware as well as personnel) was generously granted from the Leibniz- Prize to Prof. G. Hasinger (DFG grant HA 1850/28-1). Av.K. acknowledges funding through DLR 50 QV 0301, and X.L.Z. through DLR 50 OG 0502. S.M.B. acknowledges an EUMarie Curie Fellowship in Framework 6. This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. We thank X. Wu for a discussion oon the α − β relation. Max Planck: 2.2m (GROND), Gemini: South (GMOS), SAAO: Nagoya (SIRIUS), INTEGRAL (SPI-ACS).|
|Subject Keywords:||techniques: photometric gamma rays: bursts|
|Official Citation:||The redshift and afterglow of the extremely energetic gamma-ray burst GRB 080916C J. Greiner, C. Clemens, T. Krühler, A. von Kienlin, A. Rau, R. Sari, D. B. Fox, N. Kawai, P. Afonso, M. Ajello, E. Berger, S. B. Cenko, A. Cucchiara, R. Filgas, S. Klose, A. Küpcü Yolda, G. G. Lichti, S. Löw, S. McBreen, T. Nagayama, A. Rossi, S. Sato, G. Szokoly, A. Yolda and X.-L. Zhang A&A 498 (1) 89-94 (2009) DOI: 10.1051/0004-6361/200811571|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||03 Sep 2009 17:54|
|Last Modified:||26 Dec 2012 11:16|
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