Broadband Study of GRB 091127: A Sub-Energetic Burst at Higher Redshift?
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 (E γ < 3 × 1049 erg), 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.
Norris, J. P.. (2012). "Broadband Study of GRB 091127: A Sub-Energetic Burst at Higher Redshift?". The Astrophysical Journal, 761(1), 1-12.