[vsnet-grb-info 8251] GRB 090812, RIMOTS optical upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9776
SUBJECT: GRB 090812, RIMOTS optical upper limits
DATE:    09/08/12 15:14:43 GMT
FROM:    Kazuhiro Noda at Miyazaki U  <kaz1206 at astro.miyazaki-u.ac.jp>

K.Noda, A.Daikyuji, K.Kono, E.Sonoda,
N.Ohmori, H.hayasi, M.Yamauchi
(University of Miyazaki)

We have observed the field covering the error circle of
GRB 090812 (Swift trigger 359711, GCN 9768, M. Stamatikos et al.)
with the unfiltered CCD camera on the 30-cm telescope 
at University of Miyazaki.
The observation was started 12:30:59 UT, about 6.5 hr
after the Swift 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 9768(M. Stamatikos et al.), GCN 9769(S. B. Cenko et al.)
 GCN 9770(R.J. Smith et al.), GCN 9772(M.R. Goad et al.)
 GCN 9773(Adria Updike et al.), GCN 9774(P. Schady et al.))

the upper limits are as follows:
--------------------------------------------------------------
Start(UT)   End(UT)    Num. of frames    Limit (mag.)
--------------------------------------------------------------
12:30:59    12:31:29          1            12.1
12:30:59    13:45:22         62            17.3
---------------------------------------------------------------