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TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 1920
SUBJECT: GRB030227: Kiso optical upper limit
DATE: 03/03/04 09:26:51 GMT
FROM: Yuji Urata at RIKEN <urata@crab.riken.go.jp>
Y. Urata, T. Aoki on behalf of the Kiso GRB team
and H. Izumiura (OAO) report:
We re-examine our multi-band data obtained at Kiso observatory
starting at 2.1 hour after the burst (Izumiura et al. GCN1900).
We could not detect the optical afterglow ( S1-A ; Castro-Tirado et
al. GCN 1904, Soderberg et al. GCN 1907, Berger et al. GCN 1910,
Gorosabel et al. GCN 1915) down to limiting magnitudes estimated by
comparison with the result of field photometry by Henden (GCN1917).
Our data:
Date Time (UT) Band Exposure Limiting mag.(SN=3)
02-27 10:43-11:03 R 300s x 3 21.1
11:05-11:24 I 300s x 3 20.1
11:27-11:32 V 300s x 3 20.9
11:49-12:08 B 300s x 3 21.7
12:44-12:54 R 600s 20.6
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