X-ray upper limits from the M82 optical transient

Thomas J Maccarone, Rob Fender, Rob Beswick, Simon Garrington, Ralph Spencer, Tom Muxlow, Peter Thomasson

    Research output: Contribution to journalArticlepeer-review


    Swift observed the recent optical transient (ATel #1501) in M82 for 4900 sec and made no detection of X-rays from the source. The upper limit corresponds to approximately 2*10^-3 cts/sec (99% confidence level), which corresponds to a .1-10 keV X-ray luminosity of 1.5 * 10^38 ergs/sec for a 1 keV blackbody spectrum or for a Gamma=1.7 power law, assuming the foreground absoprtion of 5*10^20 cm^-3.
    Original languageEnglish
    JournalThe Astronomer's Telegram
    Publication statusPublished - 2008


    • Radio
    • Optical
    • X-ray
    • Globular Clusters
    • Novae
    • Transients


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