GCN Circular 30275
Subject
GRB 210619B: CAHA 2.2m photometric monitoring
Event
Date
2021-06-20T15:53:18Z (4 years ago)
From
Alexander Kann at IAA-CSIC <kann@iaa.es>
D. A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC,
DARK/NBI), M. Blazek, C. Thoene, J.F. Agui Fernandez, Ginger (all
HETH/IAA-CSIC), and J. I. Vico Linares (CAHA) report:
We observed the afterglow of GRB 210619B (Swift detection: D'Avanzo et
al., GCN 30261; GECAM detection: Zhao et al., GCN 30264; Fermi-LAT
detection: Axelsson et al., GCN 30270; Afterglow detections: Lipunov et
al., GCN 30259; D'Avanzo et al., GCN 30261; Lipunov et al., GCN 30262;
Jelinek et al., GCN 30263; Kong, GCN 30265; Pellegrin et al., GCN 30268;
Perley, GCN 30271; Zheng & Filippenko, GCN 30273; Blazek et al., GCN
30274; Redshift: de Ugarte Postigo, GCN 30272) with CAFOS mounted at the
2.2m Calar Alto telescope (Almeria, Spain). After a weather-induced
delay, we obtained 80 x 60 s images in Ic. The afterglow is clearly
detected in each image.
The sequence starts at 01:23 UT and ends at 03:43 UT on 2021-06-20
(0.05836 to 0.15479 d after burst trigger). Comparing to a single star
with a magnitude derived from PanSTARRS and transformed following Lupton
(2005), we find the afterglow decays from Ic (AB) = 16.75 +/- 0.05 mag
to Ic (AB) = 17.45 +/- 0.05 mag.
Further observations are planned.