The extragalactic Supernova Remnant SN2006gy and flaring activity of Mkn 421 and Mkn 501

Abstract

The observation results of the explosion of the extragalactic Supernova remnant SN2006 gy (z=0.019) are presented. NGC 1275 has been regularly observed by SHALON since 1996. NGC 1275 is being intensively studied and the γ-ray flux is found to be ( 0.78 ± 0.13 ) × 10 − 12 c m − 2 s − 1 . A flux increase was detected from the region NGC 1275 in autumn 2006. The detailed analysis of γ-shower direction resulted in the detection of a metagalactic object. This object was identified with the supernova SN 2006gy that is about 10′ away from NGC 1275. The integral γ-ray flux for SN 2006gy is found to be ( 3.51 ± 0.20 ) × 10 − 12 c m − 2 s − 1 at energies of > 0.8 TeV . The integral average γ-ray fluxes of Mkn 421 and Mkn 501 were estimated as ( 0.63 ± 0.14 ) c m − 2 s − 1 and ( 0.86 ± 0.13 ) c m − 2 s − 1 respectively. An increase of the flux over the average value was detected in the 1997 and 2004 observations of Mkn 421 by SHALON and estimated to be ( 1.01 ± 0.25 ) c m − 2 s − 1 and ( 0.96 ± 0.2 ) c m − 2 s − 1 , respectively. A significant increase of Mkn 501 flux was detected in 1997 with VHE ground telescopes worldwide.