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Cenko, SB, Urban, AL, Perley, DA, Horesh, A, Corsi, A, Fox, DB, Cao, Y, Kasliwal, MM, Lien, A, Arcavi, I, Bloom, JS, Butler, NR, Cucchiara, A, Diego, JAD, Filippenko, AV, Gal-Yam, A, Gehrels, N, Georgiev, L, González, JJ, Graham, JF , Greiner, J, Kann, DA, Klein, CR, Knust, F, Kulkarni, SR, Kutyrev, A, Laher, R, Lee, WH, Nugent, PE, Xavier Prochaska, J, Ramirez-Ruiz, E, Richer, MG, Rubin, A, Urata, Y, Varela, K, Watson, AM and Wozniak, PR (2015) IPTF14yb: The first discovery of a gamma-ray burst afterglow independent of a high-energy trigger. The Astrophysical Journal Letters, 803 (2). ISSN 2041-8205
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Abstract
We report here the discovery by the Intermediate Palomar Transient Factory (iPTF) of iPTF14yb, a luminous(Mr ≈ -27.8 mag), cosmological (redshift 1.9733), rapidly fading optical transient. We demonstrate, based onprobabilistic arguments and a comparison with the broader population, that iPTF14yb is the optical afterglow ofthe long-duration gamma-ray burst GRB 140226A. This marks the first unambiguous discovery of a GRBafterglow prior to (and thus entirely independent of) an associated high-energy trigger. We estimate the rate ofiPTF14yb-like sources (i.e., cosmologically distant relativistic explosions) based on iPTF observations, inferringan all-sky value of Rrel = 610 yr?1 (68% confidence interval of 1102000 yr?1). Our derived rate is consistent(within the large uncertainty) with the all-sky rate of on-axis GRBs derived by the Swift satellite. Finally, webriefly discuss the implications of the nondetection to date of bona fide orphan afterglows (i.e., those lackingdetectable high-energy emission) on GRB beaming and the degree of baryon loading in these relativistic jets. © 2015. The American Astronomical Society. All rights reserved.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0201 Astronomical And Space Sciences |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | American Astronomical Society |
| Date Deposited: | 22 Feb 2017 09:15 |
| Last Modified: | 04 Sep 2021 04:04 |
| DOI or ID number: | 10.1088/2041-8205/803/2/L24 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/5693 |
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