ARGO-YBJ detects a VHE gamma-ray flare from Mrk501

Details ARGO-YBJ detects a VHE gamma-ray flare from Mrk501 ARGO-YBJ detects a VHE gamma-ray flare from Mrk501

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3801....1b&link_type=abstract

The Astronomer's Telegram, #3801

Astronomy and Astrophysics

Astronomy

Tev, Agn

Scientific paper

We report on the observation of a strong gamma-ray flare from Mrk501 at energies above 300 GeV by the ARGO-YBJ experiment, following the discovery by MAXI/GSC (ATEL #3752) of X-ray brightening starting on November 1, 2011. According to the Swift/BAT light curve at 15-50 keV, this flare started on October 17 and lasted at least until December 9. Integrating the flux from Mrk501 detected by ARGO-YBJ over the period from October 17 to November 21 (more data are still in analysis), an excess with statistical significance of 6.1 standard deviations is found.

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