TITLE:   GCN CIRCULAR
NUMBER:  6223
SUBJECT: GRB070220: optical observations
DATE:    07/03/23 19:09:29 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

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

We observed error box of GRB070220 (Stamatikos  et al., GCN 6114) with Shajn
2.6m telescope of CrAO  in R-band on Feb. 8 between (UT)19:25 and 19:53. No
object is found in refined XRT error box (Beardmore et al., GCN 6118).
Limiting magnitude of a combined image is based on USANO A2.0:

Mid time (UT),  Exposure,    R_Lim (3sigma)
Feb. 8.819      22x60        23.9

The combined image can be found in
http://grb.rssi.ru/GRB070220/grb070220_R_ZTSh.gif

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