[vsnet-grb-info 6951] GRB081118 : optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8535
SUBJECT: GRB081118 : optical upper limit
DATE:    08/11/21 09:12:42 GMT
FROM:    Hidenori Hayasi at Miyazaki U  <hayasi at astro.miyazaki-u.ac.jp>

H.hayasi, N.Ohmori, K.Kono H.Tanaka, R.Hara, M.Yamauchi, E.Sonoda,
(University of Miyazaki)

We have observed the field covering the error circle of 
GRB081118(GCN 8524, Hoversten et al.) 
with the unfiltered CCD camera on the 30-cm telescope at
University of Miyazaki.
The observation was started 14:57:54 UT, 38.1 min
after the Swift-BAT trigger time.

We have compared our data of 30 sec exposures
with the USNO-A2.0 catalog.there is no new source
at the reported position.
(GCN 8524, Hoversten et al. GCN 8526, Palmer et al. GCN 8528, D'Avanzo et al.) 


the upper limits are as follows:
--------------------------------------------------------------
Start(UT) End(UT) Num. of frames Limit (mag.)
--------------------------------------------------------------
15:35:58 15:36:28 1  16.7
15:35:58 16:11:50 32 17.6
---------------------------------------------------------------