Optical counterpart of the new X-ray transient SRGt J071522.1-191609
ATel #13669; Albert K. H. Kong (National Tsing Hua University, Taiwan)
on 25 Apr 2020; 17:26 UT
Credential Certification: Albert Kong (akong@phys.nthu.edu.tw)
Subjects: Optical, X-ray, Black Hole, Neutron Star, Transient
Following the discovery of the new X-ray transient SRGt J071522.1-191609 (ATel #13657), we observed the field with the iTelescope.Net T30 0.51m telescope in Siding Spring, Australia. The observation began on 2020 April 24, 8:50 UT and was carried out with a R-band filter for 300 sec. The possible optical counterpart at the X-ray position (ATel #13661) reported in ATel #13663 is clearly detected in our image and the coordinate is R.A. = 07:15:21.9, Decl. = -19:16:05.3 (J2000). We notice that both observations were taken almost at the same time. Owing to the crowded field, we performed a PSF-fitting to extract the magnitude of the counterpart. By comparing with the USNO-B1.0 catalogue, we derived a magnitude of R = 19.1+/-0.1. This new source is not seen in the Pan-STARRS archival images and we therefore conclude that the source is the optical counterpart of the new X-ray transient SRGt J071522.1-191609.
More multi-wavelength observations are encouraged to reveal the nature of this new transient.
