TITLE: GCN CIRCULAR NUMBER: 39325 SUBJECT: GRB 250213A：SVOM/VT optical candidate DATE: 25/02/14 15:17:24 GMT FROM: Liping Xin at NAOC, SVOM xlp@nao.cas.cn
L.P. Xin, Y.L. Qiu, H.L. Li(NAOC), Y. Wang(PMO), W.J. Xie, C. Wu, Z.H. Yao, Y.N. Ma, X.H. Han, H.B. Cai, J. Wang, J.Y. Wei (NAOC), report on behalf of the SVOM team:
The SVOM/VT conducted follow-up observations of the GRB 250213A (Wang et al., GCN 39317) in VT_B (400nm-650nm) and VT_R (650nm-1000nm) channel simultaneously.
With the X band downlinked data, an uncatalogued optical source was detected within the errorbox of XRT2 (Evens et al., GCN 39321) in VT_R stacked image, compared to the Pan-STARRS DR1 catalog.
The brightness of the source was estimated to be 22.5 +/-0.2 mag in AB magnitude in VT_R image at the mid time of 3.28 hours post the burst, with a total exposure time of 42*100 seconds.
The source is located at RA, Dec =112.55872, =-19.94929, which is equivalent to:
RA (J2000) : 07:30:14.1 Dec (J2000): -19:56:57.44 with an uncertainty of 0.5 arcsec.
Based on the data available, we are not sure wether it is a persistent source or the candidate for the burst. More deep follow-ups are encouraged to confirm the nature of the source.
The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC),CAS.
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