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    The needle in the 100 deg2 haystack: Uncovering afterglows of Fermi GRBs with the Palomar Transient Factory

    Access Status
    Open access via publisher
    Authors
    Singer, L.
    Kasliwal, M.
    Cenko, S.
    Perley, D.
    Anderson, Gemma
    Anupama, G.
    Arcavi, I.
    Bhalerao, V.
    Bue, B.
    Cao, Y.
    Connaughton, V.
    Corsi, A.
    Cucchiara, A.
    Fender, R.
    Fox, D.
    Gehrels, N.
    Goldstein, A.
    Gorosabel, J.
    Horesh, A.
    Hurley, K.
    Johansson, J.
    Kann, D.
    Kouveliotou, C.
    Huang, K.
    Kulkarni, S.
    Masci, F.
    Nugent, P.
    Rau, A.
    Rebbapragada, U.
    Staley, T.
    Svinkin, D.
    Thöne, C.
    Postigo, A.
    Urata, Y.
    Weinstein, A.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Singer, L. and Kasliwal, M. and Cenko, S. and Perley, D. and Anderson, G. and Anupama, G. and Arcavi, I. et al. 2015. The needle in the 100 deg2 haystack: Uncovering afterglows of Fermi GRBs with the Palomar Transient Factory. The Astrophysical Journal. 806: 52.
    Source Title
    The Astrophysical Journal
    DOI
    10.1088/0004-637X/806/1/52
    ISSN
    0004-637X
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/52030
    Collection
    • Curtin Research Publications
    Abstract

    The Fermi Gamma-ray Space Telescope has greatly expanded the number and energy window of observations of gamma-ray bursts (GRBs). However, the coarse localizations of tens to a hundred square degrees provided by the Fermi GRB Monitor instrument have posed a formidable obstacle to locating the bursts' host galaxies, measuring their redshifts, and tracking their panchromatic afterglows. We have built a target-of-opportunity mode for the intermediate Palomar Transient Factory in order to perform targeted searches for Fermi afterglows. Here, we present the results of one year of this program: 8 afterglow discoveries out of 35 searches. Two of the bursts with detected afterglows (GRBs 130702A and 140606B) were at low redshift (z = 0.145 and 0.384, respectively) and had spectroscopically confirmed broad-line Type Ic supernovae. We present our broadband follow-up including spectroscopy as well as X-ray, UV, optical, millimeter, and radio observations. We study possible selection effects in the context of the total Fermi and Swift GRB samples. We identify one new outlier on the Amati relation. We find that two bursts are consistent with a mildly relativistic shock breaking out from the progenitor star rather than the ultra-relativistic internal shock mechanism that powers standard cosmological bursts. Finally, in the context of the Zwicky Transient Facility, we discuss how we will continue to expand this effort to find optical counterparts of binary neutron star mergers that may soon be detected by Advanced LIGO and Virgo. © 2015. The American Astronomical Society. All rights reserved.

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