GCN Circular 28917
Subject
GRB 201116A: NOT optical observations
Event
Date
2020-11-17T11:25:52Z (5 years ago)
From
Daniele B Malesani at DTU Space <malesani@space.dtu.dk>
Z.P. Zhu (NAOC, HUST), D. B. Malesani (DTU Space), D. Xu (NAOC), A. de
Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), L. Izzo (DARK/NBI), P. Galindo
(NOT), report on behalf of a larger collaboration:
On 2020 Nov 17, we observed the afterglow (de Ugarte Postigo et al., GCN
28915; Tohuvavohu�� et al., GCN 28916) of GRB 201116A, detected by
Fermi/GBM and Fermi/LAT (Axelsson et al., GCN 28907), using the Nordic
Optical Telescope (NOT) equipped with the ALFOSC camera. We obtained one
and three 300-s images in the r and z bands, respectively.
An optical source is detected in both filters, respectively, being
consistent with the reported OSN position as well as with the Swift/XRT
position. Preliminary photometry results are as follows:
������ T_start������������������ T_mid���� Exptime�� Filter���� Mag���� MagErr
�������� (UT)���������������������� (day)���� (s)
2020-11-17T04:33:15�� 1.157���� 1x300������ sdss-r���� 23.18 0.20
2020-11-17T04:38:51�� 1.165���� 3x300������ sdss-z���� 22.50 0.27
calibrated against nearby PS1 stars. Our observations confirm the
presence of the source, which is a clear afterglow candidate, though the
photometric error and short time difference do not allow to establish
variability compared to the OSN measurement (de Ugarte Postigo et al.,
GCN 28915).