Broadband study of GRB 091127: a sub-energetic burst at higher redshift?
E. Troja, T. Sakamoto, C. Guidorzi, J. P. Norris, A. Panaitescu, S., Kobayashi, N. Omodei, J. C. Brown, D. N. Burrows, P. A. Evans, N. Gehrels, F., E. Marshall, N. Mawson, A. Melandri, C. G. Mundell, S. R. Oates, V. Pal'shin,, R. D. Preece, J. L. Racusin, I. A. Steele
TL;DR
This study analyzes GRB 091127's broadband emission, revealing it as a sub-energetic burst at higher redshift with typical prompt and afterglow features but unusual spectral properties, suggesting suppressed high-energy emission.
Contribution
It provides a detailed broadband analysis of GRB 091127, highlighting its sub-energetic nature and spectral characteristics, and explores the connection to high-energy emission suppression.
Findings
GRB 091127 exhibits low energy release and soft spectrum.
The burst shows typical long GRB afterglow behavior.
Spectral lag indicates connection to sub-energetic bursts.
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.
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