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GRB 090902B: afterglow observations and implications

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Pandey, S. B., Swenson, C. A., Perley, D. A., Guidorzi, C., Wiersema, K., Malesani, D., Akerlof, C., Ashley, M. C. B., Bersier, D., Cano, Z. et al.
(2010) GRB 090902B: afterglow observations and implications. Astrophysical Journal, Vol.714 (No.1). pp. 799-804. doi:10.1088/0004-637X/714/1/799

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Official URL: http://dx.doi.org/10.1088/0004-637X/714/1/799

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Abstract

The optical-infrared afterglow of the Large Area Telescope (LAT)-detected long-duration burst, GRB 090902B, has been observed by several instruments. The earliest detection by ROTSE-IIIa occurred 80 minutes after detection by the Gamma-ray Burst Monitor instrument on board the Fermi Gamma-Ray Space Telescope, revealing a bright afterglow and a decay slope suggestive of a reverse shock origin. Subsequent optical-IR observations followed the light curve for 6.5 days. The temporal and spectral behavior at optical-infrared frequencies is consistent with synchrotron fireball model predictions; the cooling break lies between optical and XRT frequencies similar to 1.9 days after the burst. The inferred electron energy index is p = 1.8 +/- 0.2, which would however imply an X-ray decay slope flatter than observed. The XRT and LAT data have similar spectral indices and the observed steeper value of the LAT temporal index is marginally consistent with the predicted temporal decay in the radiative regime of the forward shock model. Absence of a jet break during the first 6 days implies a collimation-corrected gamma-ray energy E-gamma > 2.2 x 10(52) erg, one of the highest ever seen in a long-duration gamma-ray bursts. More events combining GeV photon emission with multiwavelength observations will be required to constrain the nature of the central engine powering these energetic explosions and to explore the correlations between energetic quanta and afterglow emission.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Journal or Publication Title: Astrophysical Journal
Publisher: IOP Publishing
ISSN: 0004-637X
Official Date: 1 May 2010
Dates:
DateEvent
1 May 2010Published
Volume: Vol.714
Number: No.1
Number of Pages: 6
Page Range: pp. 799-804
DOI: 10.1088/0004-637X/714/1/799
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: NASA, NSF, DNRF
Grant number: NNX08AV63G, PHY-0801007

Data sourced from Thomson Reuters' Web of Knowledge

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