Optical observations of MAXI J1910-057/Swift J1910.2-0546 with ZTF
ATel #15229; A. K.H. Kong (NTHU) on behalf of the Zwicky Transient Facility Collaboration
on 19 Feb 2022; 03:48 UT
Credential Certification: Albert Kong (akong@phys.nthu.edu.tw)
Subjects: Optical, Binary, Black Hole, Transient
Referred to by ATel #: 15303
We report on the detection of the optical counterpart of the black hole candidate MAXI J1910-057/Swift J1910.2-0546 recently in an X-ray brightening with the Zwicky Transient Facility (ZTF; Bellm et. al 2019, Graham et. al 2019). ZTF detected the source (ZTF name: ZTF22aaaumci) as a transient on 2022-02-11 with a r magnitude of ~16.4. The source has become fainter on 2022-02-12 and 2022-02-18 with a r magnitude of ~16.6 and ~17.2, respectively. The brightness change of the source is consistent with the observations reported by Hosokawa et al. (ATel #15226). It strongly indicates that MAXI J1910-057/Swift J1910.2-0546 is now fading. The quiescent r-band magnitude of the source is 23.46 (Lopez et al. 2019). It is worth noting that the start of the X-ray brightening of the source is on 2022-02-04 (ATel #15214) with the first radio detection on 2022-02-07 (ATel #15219). ZTF was offline before 2022-02-11.
Public ZTF data of MAXI J1910-057 can be obtained from https://alerce.online/object/ZTF22aaaumci
A quick look of the public MAXI data indicates that MAXI J1910-057 is now fading below the detection limit for soft X-rays (http://maxi.riken.jp/pubdata/v7lrkn/J1910-057/index.html). This suggests that MAXI J1910-057 may now be returning to the quiescent state.
Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW. We acknowledge further support from the NSF under grants AST- 1812779 and the Heising-Simons Foundation under grant 2018-0908.
