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GRB 231115A—a Magnetar Giant Flare in the M82 Galaxy

Minaev, P. Yu.; Pozanenko, A. S.; Grebenev, S. A. +5 more

The results of a study of the short gamma-ray burst GRB 231115A in the X-ray and gamma-ray ranges are presented, based on data from the INTEGRAL and Fermi space observatories. The source of the burst is localized by the IBIS/ISGRI telescope of INTEGRAL observatory with an accuracy of ${≤}1.\!\!^'5$, it is located in the Cigar Galaxy (M 82). Early …

Deep Hard X-ray Survey of the M81 Field Based on INTEGRAL¹ Data

Sazonov, S. Yu.; Mereminskiy, I. A.; Krivonos, R. A.

We have carried out a deep survey of the M81 field in the 25-60 keV energy band based on long-term (2003-2023) INTEGRAL observations. A record sensitivity of 0.16 mCrab at a detection significance of $4σ$ has been achieved in the central part of the field owing to the long accumulated exposure (19.2 Ms). The total area of the survey is 1004 deg${}…