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Title: Optical observations of GRB 060124 afterglow: a case for an injection break
Authors: Misra, Kuntal
Bhattacharya, D.
Sahu, D.K.
Sagar, R.
Anupama, G.C.
Castro-Tirado, A.J.
Guziy, S.S.
Bhatt, B.C.
Keywords: gamma rays: bursts
techniques: photometric
Issue Date: 2007
Publisher: EDP Sciences
Citation: Astronomy and Astrophysics, 2007, Vol.464, p.903-908
Abstract: Aims.We present broad band optical afterglow observations of a long duration GRB 060124 using the 1.04-m Sampurnanand Telescope at ARIES, Nainital and the 2.01-m HCT at IAO, Hanle, including the earliest ground-based observations in R band for this GRB. We determine the decay slope of the light curve at different bands and examine the reality of a proposed jet break. Methods: .We use data from our observations as well as others reported in the literature to construct light curves in different bands and make power law fits to them. The spectral slope of the afterglow emission in the optical band is estimated. Results: .Our first R-band observations were taken ~0.038 d after burst. We find that all available optical data after this epoch are well fit by a single power law, with a temporal flux decay index ᘠ0.94. We do not find any evidence of a jet break within our data, which extend till ~2 d after the burst. The X-ray light curve, however, shows a distinct break around 0.6 day. We attribute this break to a steepening of the electron energy spectrum at high energies. Conclusions: .We conclude that the above measurements are consistent with the picture of a standard fireball evolution with no jet break within t˜ 2 days after the burst. This sets a lower limit of 3× 1050 erg to the total energy released in the explosion.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0004-6361
1432-0746 (Online)
Alternative Location:
Copyright: 2007 The European Southern Observatory (ESO)
Appears in Collections:Research Papers (A&A)

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