TITLE:   GCN CIRCULAR
NUMBER:  31370
SUBJECT: GRB 220101A: Tautenburg observations
DATE:    22/01/02 14:42:12 GMT
FROM:    Ana Nicuesa at TLS Tautenburg  <ana@tls-tautenburg.de>

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

We observed the field of GRB 220101A (Tohuvavohu et al., GCN 31347) with
the Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6kx6k CCD
camera.

Observations were performed on January 1, 2022, at a midtime of 22.14 UT.
For the optical transient (Tohuvavohu et al., GCN 31347; Kuin &
Tohuvavohu, GCN 31351; Fu et al., GCN 31353; Hentunen et al., GCN 31356;
Perley et al., GCN 31357; de Ugarte Postigo et al., GCN 31358; Fynbo et
al., GCN 31359; Vinko et al., GCN 31361; Tomasella et al., GCN 31363; Mao
et al., GCN 31364; Noschese et al., GCN 31366; Mao et al., GCN 31368) we
measure

r = 19.86 +/- 0.13 mag (AB),

calibrated against the SDSS catalogue.