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GCN Circular 9257

Subject

GRB 090426, RIMOTS optical upper limits

Date

2009-04-26T15:53:43Z (15 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 9254Not found
 
 
, 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 9254Not found
 
 
, 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
---------------------------------------------------------------