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American Astronomical Society, Astrophysical Journal, 1(761), p. 50, 2012

DOI: 10.1088/0004-637x/761/1/50

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Broadband study of GRB 091127: a sub-energetic burst at higher redshift?

Journal article published in 2012 by E. Troja, T. Sakamoto, A. Panaitescu, N. Omodei ORCID, V. Pal'shin, R. D. Preece, J. L. Racusin, I. A. Steele, N. R. Tanvir, V. Vasileiou, C. Wilson-Hodge, K. Yamaoka, C. Guidorzi, J. P. Norris, S. Kobayashi and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

GRB 091127 is a bright gamma-ray burst (GRB) detected by Swift at a redshift z=0.49 and associated with SN 2009nz. We present the broadband analysis of the GRB prompt and afterglow emission and study its high-energy properties in the context of the GRB/SN association. While the high luminosity of the prompt emission and standard afterglow behavior are typical of cosmological long GRBs, its low energy release, soft spectrum and unusual spectral lag connect this GRB to the class of sub-energetic bursts. We discuss the suppression of high-energy emission in this burst, and investigate whether this behavior could be connected with the sub-energetic nature of the explosion. ; Comment: 12 pages, 7 figures, submitted to ApJ