GCN Circular 9257
Subject
GRB 090426, RIMOTS optical upper limits
Date
2009-04-26T15:53:43Z (16 years ago)
From
Kenta Kono at Miyazaki U <kenta0514@astro.miyazaki-u.ac.jp>
K.Kono, K.Noda, E.Sonoda, N.Ohmori, H.hayasi,
A.Daikyuji, Y.Nisioka, M.Yamauchi
(University of Miyazaki)
We have observed the field covering the error circle of
GRB090426 (Swift trigger 350479, GCN 9254, J. R. Cummings et al.)
with the unfiltered CCD camera on the 30-cm telescope
at University of Miyazaki.
The observation was started 12:50:29 UT (1.7 min. after the Swift trigger),
under cloudy condition.
First analyzable image was obtained at 12:57:06 UT (6.5 min. after the Swift trigger).
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 9254, J. R. Cummings et al.)
the upper limits are as follows:
--------------------------------------------------------------
Start(UT) End(UT) Num. of frames Limit (mag.)
--------------------------------------------------------------
12:57:06 12:57:36 1 15.3
12:57:06 13:17:26 10 16.8
---------------------------------------------------------------