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Upper Limits on the VHE Gamma-Ray Flux of SN2014J in M82 From Observations by MAGIC

The MAGIC collaboration observed SN2014J, the nearest supernova (SN) explosion in 10 years, located in the galaxy M82. The MAGIC observations started 6 days after the first detection by the UCL Observatory (CBET #3792) and amounted to a total of 5.4 hours. This Ia-type SN is unique and follow-up observations in all wavelengths have been pursued (i.e. ATel #5835, #5809, #5812, #5851). The SN was observed with the MAGIC telescopes from January 27 to 29 under moderate moonlight conditions and on February 1 and 2 under dark-night conditions. The preliminary analysis of these data resulted in an integral flux upper limit of 1.6e-12 cm-2 s-1 above the energy 300 GeV at 95% c.l. (this corresponds to ~1.3% of the Crab Nebula flux ; for energies above 700 GeV the corresponding limit is ~2%), assuming a Crab-like spectral index. The daily flux upper limits (~1h observation per day) vary from 1.8e-12 to 18.e-12 cm-2 s-1 (E>300 GeV, 95% c.l.), due to different observational conditions. The VHE flux contribution from the host galaxy M82 was previously measured by VERITAS (Nature, 462, 700) at the level of 0.9% of the Crab flux for E>700 GeV. The MAGIC observations covered the maximum of the SN brightening (on Jan 31, mag=10.5 AAVSO data: PSN J09554214+6940260). 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.

Gamma Ray ; TeV ; VHE ; Supernovae

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