TITLE:   GCN CIRCULAR
NUMBER:  31822
SUBJECT: GRB 220403A: Tautenburg observations
DATE:    22/04/03 22:57:37 GMT
FROM:    Ana Nicuesa at TLS Tautenburg  <ana@tls-tautenburg.de>

A. Nicuesa Guelbenzu, B. Stecklum, S. Klose, S. Melnikov, and
U. Ludwig (all Tautenburg) report:

Tautenburg started observing the field of GRB 220403A (Klingler et
al. GCN 31820) at 2022-04-03, 21:35:37 UT, using the 1.34m Schmidt
telescope equipped with the TAUKAM 6k x 6k CCD camera. Observations
are still ongoing.

At a mean time 21:36:07 UT for the optical transient discovered by
Swift/UVOT, we measure the following magnitude:

r = 19.28 +/- 0.04 mag (AB),

calibrated against the Pan-STARRS catalog. Compared to the observations
reported by Jelinek et al. (GCN 31821), the source is fading.