Optical outburst in the LMXB/CV CXOGBS J174623.5-310550
ATel #16148; Paul Groot (Radboud University, UCT, SAAO), Paul Vreeswijk(Radboud)
on 25 Jul 2023; 10:25 UT
Credential Certification: Paul Groot (p.groot@astro.ru.nl)
Subjects: Optical, X-ray, Binary, Black Hole, Cataclysmic Variable, Neutron Star, Transient
Paul J. Groot (Radboud/SAAO/UCT), Paul M. Vreeswijk (Radboud) report on behalf of the MeerLICHT Consortium:
"The LMXB/CV source CXOGBS J174623.5-310550 (Torres et al., 2019) was found to be in outburst in optical observations obtained with the 0.6m MeerLICHT wide-field telescope, located at the Sutherland station of the SAAO, South Africa.
The source was detected in the BlackGEM/MeerLICHT u, i and q (440-720nm) bands at a brightness of:
q= 17.09 +/- 0.02 at UT 2023-07-24 22:11:23,
u= 17.41 +/- 0.03 at UT 2023-07-24 22:12:52,
i= 16.98 +/- 0.02 at UT 2023-07-24 22:14:21.
The last 5-sigma quiescent/non-detections were
q > 21.1 at UT 2023-07-21 22:24:49,
u > 19.8 at UT 2023-07-21 22:26:17
This is the first recorded outburst of the source in MeerLICHT monitoring spanning 5 years. Archival ATLAS photometry shows one previous outburst to the same optical levels, in July 2019, after which the source declined smoothly back to quiescent levels in about 15 days.
We acknowledge the use of public data from the ATLAS consortium, made available through the fallingstar.com web-interface.
MeerLICHT is built and run by a consortium consisting of Radboud University, University of Cape Town, the South African Astronomical Observatory, the University of Oxford, the University of Manchester and the University of Amsterdam."
References:
Torres et al., 2019, MRAS 487, 2296
