Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

GRB 091024A and the Nature of Ultra-Long Gamma-Ray Bursts

Virgili, FJ and Mundell, CG and Pal'Shin, V and Guidorzi, C and Margutti, R and Melandri, A and Harrison, R and Kobayashi, S and Chornock, R and Henden, A and Updike, AC and Cenko, SB and Tanvir, NR and Steele, IA and Cucchiara, A and Gomboc, A and Levan, A and Cano, Z and Mottram, CJ and Clay, NR and Bersier, D and Kopac, D and Japelj, J and Filippenko, AV and Li, W and Svinkin, D and Golenetskii, S and Hartmann, DH and Milne, PA and Williams, G and O'Brien, PT and Fox, DB and Berger, E (2013) GRB 091024A and the Nature of Ultra-Long Gamma-Ray Bursts. Astrophysical Journal, 778 (1). ISSN 0004-637X

[img] Text
1310.0313v2.pdf - Accepted Version

Download (742kB)

Abstract

We present a broadband study of gamma-ray burst (GRB) 091024A within the context of other ultra-long-duration GRBs. An unusually long burst detected by Konus-Wind (KW), Swift, and Fermi, GRB 091024A has prompt emission episodes covering ~1300 s, accompanied by bright and highly structured optical emission captured by various rapid-response facilities, including the 2 m autonomous robotic Faulkes North and Liverpool Telescopes, KAIT, S-LOTIS, and the Sonoita Research Observatory. We also observed the burst with 8 and 10 m class telescopes and determine the redshift to be z = 1.0924 ± 0.0004. We find no correlation between the optical and γ-ray peaks and interpret the optical light curve as being of external origin, caused by the reverse and forward shock of a highly magnetized jet (RB ≈ 100-200). Low-level emission is detected throughout the near-background quiescent period between the first two emission episodes of the KW data, suggesting continued central-engine activity; we discuss the implications of this ongoing emission and its impact on the afterglow evolution and predictions. We summarize the varied sample of historical GRBs with exceptionally long durations in gamma-rays (gsim1000 s) and discuss the likelihood of these events being from a separate population; we suggest ultra-long GRBs represent the tail of the duration distribution of the long GRB population.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
Related URLs:
Date Deposited: 28 Nov 2016 11:40
Last Modified: 10 Sep 2017 07:45
DOI or Identification number: 10.1088/0004-637X/778/1/54
URI: http://researchonline.ljmu.ac.uk/id/eprint/4880

Actions (login required)

View Item View Item