[vsnet-grb-info 2459] GRB 051109B: GAO 150cm telescope Optical limit

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4296
SUBJECT: GRB 051109B: GAO 150cm telescope Optical limit
DATE:    05/11/22 06:13:34 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 051109B (Tagliaferri, et al. GCN 4222) was imaged
with the LN2 cooled CCD Camera atattched on the 150 cm telescope of the 
Gunma Astronomical Observatory. Starting at 15:28 UT (6.8 hours after the 
burst), V, Rc, and Ic frames were acquired.

 We do not identify an optical counterpart for the X-ray afterglow (Campana,
et al. GCN 4226). Following 3-sigma upper limits are derived for the stacked
frames relative to USNO-B1.0 magnitudes.

---------------------------------
MidUT   Filter  Mag     Exposure
---------------------------------
15:54   Rc      >20.2   180s x 5
16:10   Ic      >18.4   60s x 10
---------------------------------