VERITAS Observations of Gamma-Ray Bursts Detected by Swift

VERITAS Collaboration

doi:10.1088/0004-637X/743/1/62

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VERITAS Observations of Gamma-Ray Bursts Detected by Swift

Journal article

Open access

Peer reviewed

VERITAS Observations of Gamma-Ray Bursts Detected by Swift

VERITAS Collaboration

The Astrophysical journal, Vol.743(1), 62

08/31/2011

DOI: 10.1088/0004-637X/743/1/62

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https://doi.org/10.1088/0004-637X/743/1/62View

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Abstract

We present the results of sixteen Swift-triggered GRB follow-up observations taken with the VERITAS telescope array from January, 2007 to June, 2009. The median energy threshold and response time of these observations was 260 GeV and 320 s, respectively. Observations had an average duration of 90 minutes. Each burst is analyzed independently in two modes: over the whole duration of the observations and again over a shorter time scale determined by the maximum VERITAS sensitivity to a burst with a t^-1.5 time profile. This temporal model is characteristic of GRB afterglows with high-energy, long-lived emission that have been detected by the Large Area Telescope (LAT) on-board the Fermi satellite. No significant VHE gamma-ray emission was detected and upper limits above the VERITAS threshold energy are calculated. The VERITAS upper limits are corrected for gamma-ray extinction by the extragalactic background light (EBL) and interpreted in the context of the keV emission detected by Swift. For some bursts the VHE emission must have less power than the keV emission, placing constraints on inverse Compton models of VHE emission.

Astrophysics

Cosmology

Extragalactic Astrophysics

Galaxy Astrophysics

High Energy Astrophysical Phenomena

Details

Title: Subtitle: VERITAS Observations of Gamma-Ray Bursts Detected by Swift
Creators: VERITAS Collaboration
Contributors: P Kaaret (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.743(1), 62
DOI: 10.1088/0004-637X/743/1/62
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Institute of Physics (IOP)
Grant note: unidentified / Natural Sciences and Engineering Research Council of Canada (nserc_______::NSERC) 10/RFP/AST2748 / Science Foundation Ireland (sfi_________::SFI)
Language: English
Date published: 08/31/2011
Academic Unit: Physics and Astronomy
Record Identifier: 9984199676402771

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