GCN Circular 23593
Subject
GRB 181228A: possible NOT optical detection
Date
2018-12-31T00:02:45Z (5 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
D. Xu (NAOC), D.B. Malesani (DAWN/NBI/DTU and DARK/NBI), J.P.U. Fynbo
(DAWN/NBI and DAWN/DTU), M.I. Andersen (NBI), T. Pursimo (NOT) report:
We observed the field of GRB 181228A (Moss et al., GCN 23570) using the
2.56m Nordic Optical Telescope (NOT) equipped with ALFOSC, starting at
23:56:20 UT on 2018-12-28, i.e., 21.05 hr after the BAT trigger. We
obtained 3x300s unfiltered frames and 3x300s frames in the Sloan i-band.
There is a weak detection in our stacked image at the REM position
(D'Avanzo et al., GCN 23575), thus also being consistent with the
enhanced XRT error circle (Beardmore et al., GCN 23574). The above
position is not consistent with that of MASTER OT reported in Lipunov et
al. (GCN 23576). The NOT source has m(i)~25.0+/-0.5, calibrated with
nearby PanSTARRS stars, and thus it could be the optical counterpart of
GRB 181228A.