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arXiv:0706.1772 (astro-ph)
[Submitted on 12 Jun 2007]

Title:The GRB afterglow onset observed by REM: fireball Lorentz factor and afterglow fluence

Authors:Daniele Malesani (DARK), Emilio Molinari (INAF/Brera), Susanna Vergani (DIAS and DCU), Stefano Covino (INAF/Brera) (for the REM team)
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Abstract: We report observations of the early light curves of GRB 060418 and GRB 060607A, carried out with the pink robotic telescope REM. A clear peak is detected for both events, which is interpreted as the onset of the afterglow, that is the time at which the fireball starts decelerating. This detection allows to directly measure the initial fireball Lorentz factor, which was found to be Gamma_0 ~ 400 for both events, fully confirming the ultrarelativistic nature of gamma-ray burst fireballs. Sampling the light curve before the peak also allows to compute the bolometric fluence of the afterglow, which is 16% of the prompt one in the case of GRB 060418.
Comments: 4 pages, 1 figure, to appear in New Astronomy Reviews, proceedings of "070228: The Next Decade of Gamma-Ray Burst Afterglows", Amsterdam, 2007 March 19-23, eds. R.A.M.J. Wijers, L. Kaper, E. van Eerten
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.1772 [astro-ph]
  (or arXiv:0706.1772v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.1772

Submission history

From: Daniele Malesani [view email]
[v1] Tue, 12 Jun 2007 19:46:42 UTC (56 KB)
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