Optical observations of the black hole X-ray transient candidate MAXI J0637-430
ATel #13276; Kwan-Lok Li and Albert K. H. Kong (NTHU)
on 7 Nov 2019; 06:27 UT
Credential Certification: K. L. Li (lilirayhk@gmail.com)
Subjects: Optical, Black Hole, Transient
On 2019-11-05 (UT 14:00:41 - 15:42:07), we observed the X-ray transient MAXI J0637-430 (ATel #13256) with the 0.43m telescope (T17) of iTelescope.Net in Siding Spring, Australia. The optical counterpart was clearly detected at the UVOT position (ATel #13257). In our 2 x 180-sec (r- and g-band) and 17 x 120-sec (g-band) observations, the source showed ~0.1 mag variability on a timescale of ~10 minutes. By comparing to the catalog of the SkyMapper Southern Sky Survey, the colour index is (g-r)=0.28 (reddening corrected with the Galactic extinction Av = 0.198 mag; Schlafly & Finkbeiner 2011) with an average magnitude of g = 16.1 mag. Further optical observations are strongly encouraged to study the short-term variability.
The g-band light curve of MAXI J0637-430
