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

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

2012-01-19

arxiv.org/abs/1201.4181v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

12 pages, 7 figures, submitted to ApJ

Scientific paper

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.

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