ART-XC/SRG continues to see activity from Sgr A*
ATel #13039; M. Pavlinsky on behalf of the ART-XC collaboration (Space Research Institute (IKI), Moscow, Russia)
on 18 Aug 2019; 13:11 UT
Credential Certification: Roman Krivonos (krivonos@iki.rssi.ru)
Subjects: X-ray, Request for Observations, Black Hole
ART-XC telescope onboard Spectrum-RG continues to monitor the Galactic center region after reports on Sgr A* flaring activity (ATel #13007, #12768).
Recent ART-XC observations of Sgr A* on August 15-16 (2019-08-14T23:40 - 2019-08-15T14:00 and 2019-08-15T23:40 - 2019-08-16T14:00, UTC) with total exposure of 50 ks each, demonstrate source average 5-16 keV flux at the level of 1.6x10-11 erg cm-2 s-1, which corresponds to the luminosity of 1.4x1035 erg s-1 , assuming a distance of 8.5 kpc. This measurement of the source luminosity is comparable to that observed with ART-XC on August 12 (ATel #13023). We also see a small flux variability at the level of 15% on the timescale of a few hours. More detailed information will be provided in the corresponding publication, which is under preparation.
Multi-wavelength observations are encouraged; next time when ART-XC will observe Sgr A* is between 2019-08-22T05:46 and 2019-08-22T15:20 UTC.
