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VERITAS Observations of the Unusual Extragalactic Transient Swift J164449.3+573451
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2011 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, Vol. 738, no 2, L30Article in journal (Refereed) Published
Abstract [en]

We report on very high energy (>100 GeV) gamma-ray observations of Swift J164449.3+573451, an unusual transient object first detected by the Swift Observatory and later detected by multiple radio, optical, and X-ray observatories. A total exposure of 28 hr was obtained on Swift J164449.3+573451 with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) during 2011 March 28-April 15. We do not detect the source and place a differential upper limit on the emission at 500 GeV during these observations of 1.4 × 10–12 erg cm–2 s–1 (99% confidence level). We also present time-resolved upper limits and use a flux limit averaged over the X-ray flaring period to constrain various emission scenarios that can accommodate both the radio-through-X-ray emission detected from the source and the lack of detection by VERITAS.

Place, publisher, year, edition, pages
2011. Vol. 738, no 2, L30
Keyword [en]
accretion, accretion disks, galaxies: active, gamma rays: galaxies, radiation mechanisms: non-thermal
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:lnu:diva-42808DOI: 10.1088/2041-8205/738/2/L30OAI: oai:DiVA.org:lnu-42808DiVA: diva2:807524
Available from: 2015-04-23 Created: 2015-04-23 Last updated: 2015-05-05Bibliographically approved

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Prokoph, Heike
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