Optical/UV follow-up observations of Swift J1753.5-0127

ATel #9758; A. K.H. Kong (NTHU, Taiwan), K. L. Li (Michigan State), X. Hou, J. Wang (YNAO)
on 13 Nov 2016; 23:18 UT
Credential Certification: Albert Kong (akong@phys.nthu.edu.tw)

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We observed the black hole X-ray transient Swift J1753.5-0127 currently on the way to the quiescent state (ATel #9708, #9735, #9739, #9741) with the 2.4m telescope at the Lijiang Observatory in China. We took a 600-sec SDSS r-band image with the Yunnan Faint Object Spectrograph and Camera (YFOSC) on 2016 November 9 at 11:54 UTC (MJD 57701.4965). The magnitude of the source is r = 20.97+/-0.12 by comparing with several reference stars in the AAVSO Photometric All-Sky Survey (APASS). This is consistent with the continued fading of the optical emission.

We also re-analysed the Swift/UVOT uvw1-band image taken on 2016 November 7. While there is no significant UV counterpart reported (ATel #9735), the source is seen in the combined uvw1 image with a significance of about 2.5 sigma. The derived magnitude is 21.00 +/- 0.46 (stat) +/- 0.03 (sys) in the Vega system.