[vsnet-grb-info 4015] GRB061121, optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5830
SUBJECT: GRB061121, optical observation
DATE:    06/11/21 21:25:22 GMT
FROM:    Eri Sonoda at U of Miyazaki/Japan  <sonoda at astro.miyazaki-u.ac.jp>

E. Sonoda, S. Maeno, T. Hara, T. Matsumura,
K. Tanaka, H. Tanaka, M. Yamauchi
(University of Miyazaki)


  We have observed the field covering the error circle of
GRB061121 (GCN 5823) with the unfiltered CCD camera on
the 30-cm telescope at University of Miyazaki.
The observation was started 18:09:09 UT, 2.77 hour
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 position reported by K. L. Page et al.(GCN 5823)

The upper limits are as follows:
--------------------------------------------------------------
Start(UT)	End(UT)	    Num. of frames	Limit (mag.)	
--------------------------------------------------------------
18:09:09	18:24:29	9		~17
18:25:11	19:12:44	29		~17.2
---------------------------------------------------------------