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

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posted on 09.10.2019, 15:35 by E Troja, T Sakamoto, C Guidorzi, JP Norris, A Panaitescu, S Kobayashi, N Omodei, JC Brown, DN Burrows, PA Evans, N Gehrels, FE Marshall, N Mawson, A Melandri, CG Mundell, SR Oates, V Pal'shin, RD Preece, JL Racusin, IA Steele, NR Tanvir, V Vasileiou, C Wilson-Hodge, K Yamaoka
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.


National Aeronautics and Space Administration and the Department of Energy in the United States, the Commissariat à l'Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucléaire et de Physique des Particules in France, the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), High Energy Accelerator Research Organization (KEK) and Japan Aerospace Exploration Agency (JAXA) in Japan, and the K. A. Wallenberg Foundation, the Swedish Research Council and the Swedish National Space Board in Sweden.



Astrophysical Journal, 2012, 761 (1), pp. ?-? (12)

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/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy


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IOP Publishing





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