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Late-time VLA reobservations rule out ULIRG-like host galaxies for most pre-Swift long-duration gamma-ray bursts

Perley, DA, Hjorth, J, Tanvir, NR and Perley, RA (2016) Late-time VLA reobservations rule out ULIRG-like host galaxies for most pre-Swift long-duration gamma-ray bursts. Monthly Notices of the Royal Astronomical Society, 465 (1). pp. 970-977. ISSN 0035-8711

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We present new Jansky Very Large Array observations of five pre-Swift gamma-ray bursts for which an ultraluminous [star formation rate (SFR) > 100 M⊙; yr-1] dusty host galaxy had previously been inferred from radio or submillimetre observations taken within a few years after the burst. In four of the five cases, we no longer detect any source at the host location to limits much fainter than the original observations, ruling out the existence of an ultraluminous galaxy hosting any of these gamma-ray bursts (GRBs). We continue to detect a source at the position of GRB 980703, but it is much fainter than it was a decade ago and the inferred radio SFR (~80M⊙) is relatively modest. The radio flattening at 200-1000 d observed in the light curve of this GRB may have been caused by a decelerating counterjet oriented 180 deg away from the viewer, although an unjetted wind model can also explain the data. Our results eliminate all well-established ultraluminous infrared galaxies (ULIRGs) among the pre-Swift host population. They also rule out all cases for which an unobscured GRB was found in a galaxy dominated by heavily obscured star formation. When GRBs do occur in ULIRGs, the afterglow is almost always observed to be heavily obscured, consistent with the large dust opacities and high dust covering fractions characteristic of these systems. © 2016 The Authors.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 23 May 2017 12:07
Last Modified: 04 Sep 2021 11:30
DOI or ID number: 10.1093/mnras/stw2789
URI: https://researchonline.ljmu.ac.uk/id/eprint/6554
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