New short-time radio and X-ray flare from GRS1915+105
ATel #15964; S. A. Trushkin, N. A. Nizhelskij, P. G. Tsybulev, A. V. Shevchenko (SAO RAS, Russia)
on 29 Mar 2023; 17:30 UT
Credential Certification: Sergei Trushkin (satr@sao.ru)
Subjects: Radio, Infra-Red, X-ray, Binary, Transient
The prototype microquasar GRS1915+105 has flared on 25 March 13.927 (MJD 60028.5803) according to the Swift/BAT monitoring data at https://swift.gsfc.nasa.gov/results/transients/GRS1915p105/, when flux has increased from null to 1.6 counts/cm^2/s at 15-50 keV during 9 hours. The flare decay could be estimated as less 3 hours. Indeed such an event is extremely rare in last some years. In the long-time daily monitoring of microquasars with the RATAN-600 radio telescope we have detected associated flare from GRS 1915+105: 133 +/- 10 mJy at 4.7 GHz and 67+/-10 mJy at 11.2 GHz respectively on 27 March 2023 (MJD 60030.175), meanwhile fluxes a week before were lower than 20 mJy all time. This flare was a first from 5 February 2021, when the previous bright flare with flat spectrum was detected at level nearly 600 mJy, again associated with X-ray activity, especially clearly seeing in the MAXI (http://maxi.riken.jp/star_data/J1915+109/J1915+109.html) data. The radio and hard X-ray light curves are given below.
The recent light curves at 4.7 GHz (RATAN) and at 15-50 keV (Swift/BAT) from GRS1915+105
