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MAGIC detection of an increased activity from NGC 1275 at very-high-energy gamma rays

ATel #9689; Razmik Mirzoyan (Max-Planck-Institute for Physics, Munich), on behalf of the MAGIC collaboration
on 30 Oct 2016; 17:28 UT
Credential Certification: Razmik Mirzoyan (Razmik.Mirzoyan@mpp.mpg.de)

Subjects: Gamma Ray, >GeV, TeV, VHE

Referred to by ATel #: 9690, 9791, 9929, 9931

Using the MAGIC telescopes, we have observed an increase in the very-high-energy (VHE; >100 GeV) gamma-ray flux from NGC 1275 (3C 84, 03:19:48.16, +41:30:42.10, J2000.0). The preliminary analysis of the MAGIC data taken on 2016 Oct 29 indicates a flux of (8.5 +/- 0.9) x 10^-11 ph/cm^2/s corresponding to 16% of the flux from the Crab nebula (C.U.) above 100 GeV. This implies an increase by a factor of about 5 with respect to the previously measured VHE flux from this object above the same energy threshold. NGC 1275 is a Fanaroff-Riley I radio galaxy located at the red shift 0.018 in the Perseus Cluster of galaxies, and was first reported as a VHE emitter in Aleksic et al., 2012 (A&A, 539, L2). It is one of only a few radio galaxies detected in the VHE range. The typical VHE flux (>100 GeV) of this object is about 3% C.U. (Aleksic et al. 2014, A&A, 564, A5). MAGIC observations of NGC 1275 will continue during the next days and multi-wavelength observations are encouraged. The MAGIC contact persons for these observations are R. Mirzoyan (Razmik.Mirzoyan@mpp.mpg.de), P. Colin (colin@mppmu.mpg.de) and D. Glawion (dorit.glawion@astro.uni-wuerzburg.de). MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located at the Canary island of La Palma, Spain, and designed to perform gamma-ray astronomy in the energy range from 50 GeV to greater than 50 TeV.