GCN Circular 32253
Subject
GRB 220623A: NOT optical observations
Event
Date
2022-06-23T23:43:30Z (4 years ago)
From
Daniele B Malesani at Radboud U <d.malesani@astro.ru.nl>
D. B. Malesani (Radboud Univ. and DAWN/NBI), L. Izzo (DARK/NBI), J. S.
Thomsen (NOT), R. Clavero (IAC) report on behalf of a larger collaboration:
We observed the field of GRB 220623A (Sbarufatti et al., GCN 32243)
using the Nordic Optical Telescope (NOT) equipped with the ALFOSC
imager. Two sets of observations were acquired in the r and z filters,
with mid times 2022 Jun 23.890 and 23.903 UT (14.3 and 14.6 hr after the
trigger, respectively). The exposure times were 3x300 and 5x200 s in r
and z, respectively.
No source is detected in our images within or close to the GRB XRT
position (Evans et al., GCN 32248), down to the following 3-sigma limits:
r > 23.4 (AB);
z > 22.5 (AB).
Flux calibration was carried out against nearby stars from the
Pan-STARRS catalog.