TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1210
SUBJECT: GRB011212: Optical observations at Gunma
DATE:    01/12/20 10:43:51 GMT
FROM:    Ken ichi Torii at RIKEN  <torii@crab.riken.go.jp>

K. Kinugasa, O. Hashimoto (Gunma Astronomical Observatory), E. Kambe
(National Defense Academy), Y. Urata, M. Kohama, K. Torii, N. Kawai,
A. Yoshida (RIKEN), and H. Yamaoka (Kyushu Univ.)
 
 We observed the central part of the error region of GRB011212 (GCN
#1194) with the Gunma Astronomical Observatory's 150-cm telescope.
Starting at 2001 December 12.547 UT, five 120-s exposures were made
(last two were affected by a cloud) in R band at a square region
within the four corners of (R.A., Dec.) = (04:59:35.5, +32:03:19),
(04:59:43.6, +32:13:52), (05:00:33.4, +32:12:09), and (05:00:25.3,
+32:01:36) (J2000). Five 120-s exposures were made at the same
position from 2001 December 13.545 UT as well as other two fields,
which covered the entire HETE + RXTE/ASM joint error region except for
a small southernmost part (Decl. < +31:57:20). Combined images of each
pointing were as deep as DPOSS plate limit. Comparison with the DPOSS
image did not show an optical afterglow candidate brighter than 20.5R
mag.