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VERITAS Reports Markarian 421 in a High Flaring State

ATEL # 2443; Rene A Ong (UCLA) for the VERITAS Collaboration
on 18 Feb 2010; 2:21 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Rene Ong (

Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Transients

The VERITAS array of imaging atmospheric-Cherenkov telescopes has detected strong flaring in very high energy (VHE, E >100 GeV) gamma rays from the blazar Markarian 421. A preliminary analysis of approximately 5 h of observations taken last night (UT 20100217; MJD 55244) shows a variable VHE gamma-ray flux, which exceeded 3 times the Crab Nebula flux for the duration of the observations. The peak flux observed is more than 10 times that of the Crab Nebula. VERITAS will continue to observe this source tonight. Multi-wavelength observations across the electromagnetic spectrum are very much encouraged.


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R. E. Rutledge , Editor
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