TITLE:   GCN CIRCULAR
NUMBER:  33735
SUBJECT: GRB 230506C: Candidate afterglow observation by D50
DATE:    23/05/06 23:44:46 GMT
FROM:    Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek@asu.cas.cz>

M. Jelinek, J. Strobl, R. Hudec, C. Polasek (ASU CAS Ondrejov) report:

We observed the position of the Swift-detected GRB 220506C (Tohuvavohu et
al.
GCNC 33731) with the D50 telescope of the Astronomical Institute Ondrejov,
near
Prague, Czech Republic. Our observation started at 19:58 UT, i.e. 2.8 h
after
the initial trigger and was performed with an SDSS i' filter.

We confirm the presence of an object not present in the SDSS survey
reported by
Pankov et al. (GCNC 33734) in a combined image with exp. mean time ~4.0 h
after
trigger (exposed 19:58--22:35UT). The AB magnitude of the object in this
frame
is i' = 20.54 +/- 0.11.