GCN Circular 23538
Subject
GRB 181213A: HMM-0.5m, NEXT-0.6m, CNEOST-1m optical observations
Event
Date
2018-12-14T11:07:54Z (7 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Z.P. Zhu, D. Xu (NAOC), X. Zhang, J.H. Liu (XAO), B. Li, H.B. Zhao
(PMO), X. Gao (Urumqi No.1 Senior High School), M. Yang (XJTS) report:
We observed the field of GRB 181213A (Evans et al., GCN 23525; Lipunov
et al., GCN 23526; Hu et al., GCN 23527) using the HMT-0.5m telescope
located at Gao-Ya-Zi, Xinjiang, China at 14:32:10 on 2018-12-13, i.e.,
1.57hr after the Swift trigger, and obtained 45x90s, 1x120s, 1x180s
unfiltered frames.
The afterglow is clearly detected in part of the HMT images, and
preliminary results are as follows:
Date Tstart (UT) T-T0(hr) Exp.(s) Mag(R)
2018-12-13 14:55:00 1.95 3x90 18.0+/-0.1
2018-12-13 15:00:25 2.03 5x90 18.1+/-0.1
We also used the NEXT-0.6m telescope located at Nanshan, Xinjiang, at
14:49:04 UT on 2018-12-13, i.e., 1.85hr after the Swift trigger and
obtained 5x90s R-band frames under cloudy weather. The afterglow is not
detected down to a limiting magnitude of R~17 mag, calibrated with the
SDSS field.
Additionally, the CNEOST-1m telescope started observation at 21:43:36 on
2018-12-13, i.e., 8.76hr after the Swift trigger and we obtained 15x90s
VR-band frames. The afterglow is not detected down to a 3-sigma upper
limit of ~20.3 mag.