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GRB 090926A and Bright Late-Time Fermi Large Area Telescope Gamma-Ray Burst Afterglows

Swenson, CA; Maxham, A; Roming, PWA; Schady, P; Vetere, L; Zhang, BB; Zhang, B; ... De Pasquale, M; + view all (2010) GRB 090926A and Bright Late-Time Fermi Large Area Telescope Gamma-Ray Burst Afterglows. The Astrophysical Journal Letters , 718 (1) L14-L18. 10.1088/2041-8205/718/1/L14. Green open access

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Abstract

GRB 090926A was detected by both the Gamma-ray Burst Monitor and Large Area Telescope (LAT) instruments on board the Fermi Gamma-ray Space Telescope. Swift follow-up observations began ~13 hr after the initial trigger. The optical afterglow was detected for nearly 23 days post trigger, placing it in the long-lived category. The afterglow is of particular interest due to its brightness at late times, as well as the presence of optical flares at T0+105 s and later, which may indicate late-time central engine activity. The LAT has detected a total of 16 gamma-ray bursts; nine of these bursts, including GRB 090926A, also have been observed by Swift. Of the nine Swift-observed LAT bursts, six were detected by UVOT, with five of the bursts having bright, long-lived optical afterglows. In comparison, Swift has been operating for five years and has detected nearly 500 bursts, but has only seen ~30% of bursts with optical afterglows that live longer than 10^{5} s. We have calculated the predicted gamma-ray fluence, as would have been seen by the Burst Alert Telescope (BAT) on board Swift, of the LAT bursts to determine whether this high percentage of long-lived optical afterglows is unique, when compared to BAT-triggered bursts. We find that, with the exception of the short burst GRB 090510A, the predicted BAT fluences indicate that the LAT bursts are more energetic than 88% of all Swift bursts and also have brighter than average X-ray and optical afterglows.

Type: Article
Title: GRB 090926A and Bright Late-Time Fermi Large Area Telescope Gamma-Ray Burst Afterglows
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/2041-8205/718/1/L14
Publisher version: https://doi.org/10.1088/2041-8205/718/1/L14
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: gamma-ray burst: general, gamma-ray burst: individual (GRB 090926A), shock waves
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1339849
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