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Images, light curves and spectra of GRB afterglow

Granot, J. and Piran, T. and Sari, R. (1999) Images, light curves and spectra of GRB afterglow. Astronomy and Astrophysics Supplement Series, 138 (3). pp. 541-542. ISSN 0365-0138. doi:10.1051/aas:1999344.

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We calculate the light curve and spectra near the peak and the self absorption break, for an adiabatic blast wave described by the Blandford-McKee solution, considering the emission from the whole region behind the shock front. The expected light curve and spectra are flat near the peak. This rules out the interpretation of the sharp peak observed in the optical afterglow of GRB 970508 as the expected peak of the light curve. The observed image of an afterglow is calculated for a broad range of frequencies. We show that for frequencies below the self absorption frequency the image is rather homogeneous, as opposed to the bright ring at the outer edge and dim center, which appear at higher frequencies. We fit the observed spectra of GRB 970508 to the detailed theory and obtain estimates of its physical parameters.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Granot, J.0000-0001-8530-8941
Piran, T.0000-0002-7964-5420
Sari, R.0000-0002-1084-3656
Additional Information:© 1999 European Southern Observatory (ESO). Received: 29 December 1998; Accepted: 9 June 1999; Published online 15 September 1999. This research was supported by the US-Israel BSF grant 95-328 and by a grant from the Israeli Space Agency. Re'em Sari thanks the Sherman Fairchild Foundation for support.
Funding AgencyGrant Number
Binational Science Foundation (USA-Israel)95-328
Israel Space AgencyUNSPECIFIED
Sherman Fairchild FoundationUNSPECIFIED
Subject Keywords:gamma-rays: bursts; gamma-rays: theory; magnetic fields; hydrodynamics; shock waves
Issue or Number:3
Record Number:CaltechAUTHORS:20180320-102241660
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Official Citation:Images, light curves and spectra of GRB afterglow. J. Granot, T. Piran and R. Sari. Astron. Astrophys. Suppl. Ser., 138 3 (1999) 541-542 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85376
Deposited By: Tony Diaz
Deposited On:02 Apr 2018 20:47
Last Modified:15 Nov 2021 20:28

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