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 varing source is detected within the EP/WXT/FXT 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 (optional: at a median time of ~ 11 min post-trigger, calibrated with Pan-STARRS DR2 and not corrected for Galactic extinction. We acknowledge the excellent support from T.Q. Chen, and J.F. Zhang for enabling these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/44623. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...