GCN Circular 30294
Subject
GRB 210619B: NOT optical observations
Date
2021-06-21T16:41:37Z (4 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Z.P. Zhu (NAOC, HUST), A. de Ugarte Postigo (HETH, IAA-CSIC), D. B.
Malesani (DTU Space), L. Izzo (DARK/NBI), D. Alexander Kann (HETH,
IAA-CSIC), D. Xu (NAOC), A. Amanda Djupvik (NOT) report on behalf of a
larger collaboration:
We observed GRB 210619B detected by Swift/BAT (D'Avanzo et al., GCN
30261) with the Nordic Optical Telescope (NOT) equipped with StanCAM.
Observations started at 04:16:27 UT on 2021-06-21, and we obtained 3x300
s exposures in the Bessel R filter, 5x200 s in the SDSS z-filter, and
3x300 s in the i-filter (similar to SDSS i).
The previously reported optical afterglow (e.g., Lipunov et al. GCN
30259; Zhao et al. GCN 30261; Jelinek et al. GCN 30263; Kong et al. GCN
30265; Axelsson et al. GCN 30270; Perley et al. GCN 30271; de Ugarte
Postigo et al. GCN 30272; Zheng et al. GCN 30273; Blazek et al. GCN
30274; Kann et al. GCN 30275; Svinkin et al. GCN 30276; Xin et al. GCN
30277; Shrestha et al. GCN 30280; Jelinek et al. GCN 30281; Kumar et
al., GCN 30286; D'Avanzo et al., GCN 30288; D'Avanzo et al., GCN 30289;
Moskvitin et al., GCN 30291; GCN 30292) is clearly detected in our
images. Preliminary photometric results are as follows:
T_mid/d Filter Mag MagErr MagSysten
1.18338 R 19.92 0.02 Vega
1.21390 i 19.65 0.02 AB
1.20022 z 18.88 0.11 AB
calibrated by the PS1 catalogue.