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Will GRB 990123 perform an encore?

Blandford, Roger D. and Helfand, David J. (1999) Will GRB 990123 perform an encore? Monthly Notices of the Royal Astronomical Society, 305 (3). L45-L48. ISSN 0035-8711. doi:10.1046/j.1365-8711.1999.02530.x.

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The recent gamma-ray burst GRB 990123 has an absorption redshift z_s = 1.60, implying an apparent energy E ≥ 3 × 10^(54) erg, and a peak luminosity L_(max) ≥ 6 × 10^(53) erg s^(−1), assuming isotropic emission. This energy is 10 times larger than hitherto measured, and in excess of the rest mass of the Sun. Optical observations have revealed an associated galaxy displaced from the line of sight by ∼ 0.6 arcsec. This raises the possibility that the burst is enhanced by gravitational lensing. We argue that existing observations probably only allow magnifications μ > 400 if the galaxy is at z_d = 1.60 and the burst originates at much higher redshift. It should be possible to exclude this possibility by examining the burst time structure. Although we anticipate that multiple imaging can be excluded in GRB 990123, our analysis should be generally applicable.

Item Type:Article
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URLURL TypeDescription Paper
Blandford, Roger D.0000-0002-1854-5506
Additional Information:© 1999 RAS. Accepted 1999 February 22. Received 1999 February 18; in original form 1999 February 2. Published: 21 May 1999. We thank Martin Rees for encouragement, the Institute of Astronomy, University of Cambridge, for hospitality, and the Beverly and Raymond Sackler Foundation for support during the preparation of this paper. Support under NSF grant AST 95-29170 and NASA grant 5-2837 is also gratefully acknowledged.
Funding AgencyGrant Number
Raymond and Beverly Sackler FoundationUNSPECIFIED
NSFAST 95-29170
Subject Keywords:gravitational lensing, gamma-rays: bursts
Issue or Number:3
Record Number:CaltechAUTHORS:20190603-131841583
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Official Citation:Roger D. Blandford, David J. Helfand, Will GRB 990123 perform an encore?, Monthly Notices of the Royal Astronomical Society, Volume 305, Issue 3, 21 May 1999, Pages L45–L48,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96041
Deposited By: Tony Diaz
Deposited On:03 Jun 2019 20:40
Last Modified:16 Nov 2021 17:17

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