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GCN Circular 14927

GRB 130625A: Nanshan optical upper limit
2013-06-25T18:36:32Z (11 years ago)
Dong Xu at DARK/NBI <>
D. Xu (DARK/NBI), A. Esamdin, L. Ma, C.-H. Bai, G.-J. Feng (XAO) report:

We observed the field of GRB 130625A (Grupe et al., GCN 14923) using
the 1m telescope located at Mt. Nanshan, Xinjiang Astronomical
Observatory, China. We obtained 6x300s R-band frames with a mean time
of 15:40:08 UT on 2013-06-25, (i.e., 8.658 hr after the burst).

No optical source is detected within the enhanced XRT error circle
(Goad et al., GCN 14924) in the stacked image, down to a limit
magnitude of R=21.0 mag, calibrated with the USNO B1 catalog.
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