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Detection of very-high-energy gamma-ray emission from GB6 J1058+2817 with the MAGIC telescopes

ATel #14506; Oscar Blanch (IFAE-BIST), on behalf of the MAGIC collaboration
on 2 Apr 2021; 18:58 UT
Credential Certification: Oscar Blanch (blanch@ifae.es)

Subjects: Gamma Ray, TeV, VHE, AGN, Blazar

Referred to by ATel #: 14511

The MAGIC collaboration reports the first detection of very-high-energy (VHE; E>100 GeV) gamma-ray emission from GB6 J1058+2817 (R.A. = 164.624562 deg, Decl. = 28.296170 deg, J2000.0; Petrov & Taylor 2011 AJ, 142, 89) . The object was observed with the MAGIC telescopes for 2.4 hours on 2021/04/01 (MJD 59305.9). The preliminary analysis of these data resulted in the detection of GB6 J1058+2817 with a statistical significance of 6 standard deviations. The preliminary VHE flux of this detection was estimated to be about 10% of the flux from the Crab nebula above 100 GeV.

GB6 J1058+2817 is a blazar. Its redshift is not well established, with a tentative value of z=0.4793 (Massaro et al. 2014 AJ, 148, 66).

The MAGIC observations were triggered by flaring activity at GeV reported by Fermi-LAT (ATel # 14491). In addition to the enhanced activity in gamma rays, increase of the flux has been seen as well in optical frequencies (ATel #14496).

MAGIC observations on GB6 J1058+2817 will continue during the next days and multiwavelength observations are encouraged. The MAGIC contact persons for these observations are O. Blanch (blanch@ifae.es) and Julian Sitarek (jsitarek@uni.lodz.pl).

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.