GCN Circular 31797
Subject
GRB 220325A: Tautenburg observations
Event
Date
2022-03-26T20:47:50Z (4 years ago)
From
Ana Nicuesa at TLS Tautenburg <ana@tls-tautenburg.de>
A. Nicuesa Guelbenzu, S. Klose, B. Stecklum, S. Melnikov, and
U. Laux (all Tautenburg) report:
We observed the field of GRB 220325A (Ferro et al. GCN 31787) with the
Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6k x 6k
CCD camera. Observations consisted of 3x3 min exposures using the
Sloan r, i, and z-band filter. The airmass was 2.1, the seeing
relatively poor (3 arcsec).
Inside the enhanced XRT error circle (Osborne et al., GCN 31790) we do not
find any source down to the following magnitudes:
r > 20.7 mag (AB, 3 sigma), mean time: 2022-03-26, 03:05:34 UT,
i > 20.6 mag (AB, 3 sigma), mean time: 2022-03-26, 03:16:22 UT,
z > 19.7 mag (AB, 3 sigma). mean time: 2022-03-26, 03:27:10 UT,
calibrated against the Pan-STARRS catalog.