[vsnet-grb-info 2992] GRB 060204B: GETS early limit

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4829
SUBJECT: GRB 060204B: GETS early limit
DATE:    06/02/25 07:19:08 GMT
FROM:    Kenzo Kinugasa at Gunma Astro. Obs/Japan  <kinugasa at astron.pref.gunma.jp>

K. Kinugasa (Gunma Astronomical Observatory) and K. Torii (Osaka U.) report:

 The error region of GRB 060204B (Falcone et al. GCN 4655) was imaged
by the robotic 0.25m GETS telescope in the Gunma Astronomical Observatory.
Unfiltered imaging started at 14:36:23 UT (119 s after the BAT trigger)
and 30 s integration was repeated.

 We did not detect the  optical afterglow (Guidorzi et al. GCN 4661; Moon
& Cenko GCN 4667) and the following 3-sigma upper limits are derived relative
to USNO-A2.0 R mag.

------------------------------------------
StartUT  EndUT    Limit  Nframes
------------------------------------------
14:36:23 14:36:53 >16.9  1
14:36:23 14:50:00 >18.4  20
------------------------------------------