TITLE:   GCN CIRCULAR
NUMBER:  44623
SUBJECT: GRB 260515A: JinShan optical counterpart candidate
DATE:    26/05/15 19:51:51 GMT
FROM:    L. B. He at NAOC <helb@bao.ac.cn>

L.B. He, Z.P. Zhu, X. Liu, D. Xu, J. An, S.Q. Jiang (NAOC), S.Y. Fu, A.D. Zhu, L. Lei (HUST), J.Z. Liu (XAO) report:

We observed the field of GRB 260515A (sb26051504; Brunet et al., GCN 44622) using the JinShan 100B telescope located at Altay, Xinjiang, China. We obtained a series of frames in the Sloan i-band.

An uncatalogued and varying source is detected within the SVOM/ECLAIRs error circle at coordinates
R.A. (J2000) = 227.6852 deg
Dec. (J2000) = 24.5562 deg
with an uncertainty of ~ 1.0 arcsec. The source had i ~ 16.5 mag at a median time of ~ 11 min post-trigger, calibrated with Pan-STARRS1 DR2 and not corrected for Galactic extinction.

We acknowledge the excellent support from T.Q. Chen, and J.F. Zhang for enabling these observations.