Detection of flaring activity from Cygnus X-3 in soft X-ray bands by MAXI/GSC
ATel #14397; Mangal Hazra (MCC), Sabyasachi Pal (MCC/ICSP), Debasish Saha (MCC)
on 16 Feb 2021; 19:45 UT
Credential Certification: Sabyasachi Pal (sabya.pal@gmail.com)
Subjects: Request for Observations, Black Hole, Transient
Cygnus X-3 is a high mass X-ray binary that often shows flaring activity (eg., ATEL #727, #809, #952, #1092, #1100, #1483, #1486, #1881, #9444 etc). Recently it went through another outburst in the hard energy bands (15-50 keV) as observed by Swift/BAT (ATEL #14298).
We report a renewed flaring activity towards Cygnus X-3 as detected by MAXI/GSC. The flare is detectable only in the lower energy bands (2-4 keV, 4-10 keV and 2-20 keV) but no significant activity is observed by Swift/BAT and Fermi/LAT in the higher energy bands. The source flux started to increase from MJD ~59251.5 (2021-02-06) and reached 171.07±5.23 mCrab on MJD 59260.5 (2021-02-15) in the energy range 2-20 keV as observed by MAXI/GSC. The Hardness Ratio (10-20 keV/2-4 keV) varies from ~0.84 (MJD 59257.5) to ~0.24 (MJD 59260.5).
Since the flare is continuously increasing, further observations in all wavelengths are encouraged.
This research has made use of MAXI data provided by RIKEN, JAXA and the MAXI team.
Light Curve of Cygnus X-3
