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ATEL # 2309; Rene A. Ong (for the VERITAS Collaboration)
on 23 Nov 2009; 2:26 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Rene Ong (firstname.lastname@example.org)
Subjects: Gamma Ray, >GeV, Request for Observations, AGN
The VERITAS Collaboration recently discovered a new very high energy (VHE; E>100 GeV) source, VER J0521+211 (ATEL #2260), motivated by the identification of a high energy source at this location in the public Fermi-LAT data. The position is consistent, within errors, with the location of the radio-loud active galaxy RGB J0521.8+2112, whose redshift is unknown.
Ongoing VERITAS observations now show that the source has entered a higher emission state, at a level 3-4 times higher than at the time of the original detection. The observations were made on 22 November 2009, between 07:50 and 10:15 UTC, and the emission corresponds to a flux of 15-20% of the steady VHE flux from the Crab Nebula.
VERITAS will continue monitoring the source over the coming week, and observations at all wavelengths (including by other VHE observatories) are encouraged.