[vsnet-grb-info 4181] GRB061222a: optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5986
SUBJECT: GRB061222a: optical observations
DATE:    06/12/31 14:39:16 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

Yu. Efimov, V. Rumyantsev (CrAO), A. Pozanenko (IKI), D. Sharapov (MAO) on
behalf of larger GRB follow up collaboration report:

We observed error box of GRB061222a (Grupe et al., GCN 5954)  with Shajn
2.6m telescope of CrAO. A set of  60 s exposures was taken on Dec. 22 in R
between (UT) 18:28 - 19:29.   We do not detect afterglow registered in Ks
(Cenko et al., GCN 5975, GCN 5978).  No object is also detected in refined
XRT error box (Grupe, GCN 5966). Based on the USNO A2.0 star (23 53 02.73
+46 32 18.50   17.60 R) we estimate 3 sigma limiting magnitude of a combined
image (48*60 s) as R=23.8.

Finding chart can be found in
http://grb.rssi.ru/GRB061222a/GRB061222a_R_ZTSh.GIF