We observed refined error box of X-ray afterglow detected by Swift/XRT (La Parola et al. GCN 4338) of GRB 051211B (Mereghetti et al. GCN 4327) with 1.5m telescope of Maidanak Astronomical Observatory on Dec. 12 and Dec.17. Sets of R images of 10x180 s were accumulated in both epochs. We do not detect the candidate in afterglow at coordinates RA(J2000) =RA 23:02:41.57, Dec(J2000) =DEC +55...Full Text

"We have imaged a 7' x 7' region containing the INTEGRAL error box for GRB 051211B (Mereghetti et al. GCN 4327) with the 1.5-m OSN telescope at the Observatorio de Sierra Nevada, starting on Dec 11.94 UT (i.e. 25 min after the GRB). A comparison image has been taken on Dec. 15.86 UT. At the position of the X-ray afterglow detected by Swift/XRT (La Parola et al. GCN 4338) we detect one source that...Full Text

"We used the Very Large Array to observe the INTEGRAL burst GRB 051211B (GCN 4327) at a frequency of 8.46 GHz on 2005 December 14.02 UT. We find a single weak radio source (66+/-19 uJy) coincident with the fading X-ray afterglow identified by the XRT (GCN 4338), with an error of +/-1.3 arcsec in each coordinate....Full Text

We report on further analysis of the XRT observation of GRB 051211B (Mereghetti et al., GCN 4327; Pagani et al, GCN 4332; La Parola et al., GCN 4338)....Full Text

"We have observed the field covering the error box of GRB 051211B (GCN 4327) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 10:01:06 Dec 12 10:01:06 UT on Dec.12 (about 12 hours after the burst). After co-adding a set of 10 images (10:01:06 - 10:13:59 UT) of 30 sec exposures, we have compared with the USNO A2.0 catalog. Preliminary...Full Text

We responded to GRB 051211B (INTEGRAL trig. 2712; Mereghetti et al, GCN 4327) at 2005/12/12 00:59:37 UT with two 10 minute I and R exposures centered on the position of the original INTEFRAL GRB Position under 4.6 arcsecond photometric conditions. The source was not detected in any of the above exposures in the same position reported by Klotz et al. (GCN 4328) due to detection limits....Full Text

Correction to GCN 4340 (Blustin et al.): No source was detected at the TAROT (Klotz et al., GCN 4328) position (not Magellan)....Full Text

The Swift/UVOT began observing the field of GRB 051211b at 01:05:32 on 2005-12-12, ~3 hours after the INTEGRAL trigger (Mereghetti et al., GCN 4327). No source was detected at either the XRT (Pagani et al., GCN 4332) or TAROT (Klotz et al., GCN 4328) positions in summed images down to the following 3-sigma upper limits (not corrected for extinction)....Full Text

The Swift XRT began observing GRB 051211B, detected by INTEGRAL (Mereghetti et al., GCN 4327), at 01:05:28 UT on 12 December 2005 (10.8 ks after the burst). With five orbits of data (from 11 ks to 36 ks after the burst), the uncataloged X-ray source reported in Pagani et al. (GCN 4332) is clearly fading, consistent with being the afterglow of this burst. Our updated position is ...Full Text

"The 2-m Liverpool Telescope located in La Palma, Canary Islands, observed GRB 051211B detected by INTEGRAL (Mereghetti et al. GCN 4327) ~66 min after the GRB trigger time. The observation could not commence earlier because of the weather. The "detection mode" procedure did not detect any obvious candidate brighter than about r'=16 mag from 3x10-s images. The limiting magnitude is due to...Full Text

The error box of GRB 051211b (INTEGRAL trig. 2712; Mereghetti et al, GCN 4327) was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakyrlytepe, TUBITAK National Observatory, Turkey), starting at Dec. 11, 22:23UT, i.e. 18 min after the burst. Observations were started at zenith distance Z=69 degrees and were continued until the object descended into the clouds near the horizon....Full Text

We have imaged the field of the Integral GRB 051211b (Mereghetti et al., GCN 4327) with the automated Palomar 60-inch telescope. Observations consisted of one 120 s exposure in the Kron R and one 120 s exposure in i' at approximately 12 December 03:20 UT (5.2 hours after the burst). Further observations were precluded by inclement weather....Full Text

The Swift XRT began observing GRB 051211B, detected by INTEGRAL (Mereghetti et al., GCN 4327), at 01:05:28 UT on 12 December 2005 (10.8 ks after the burst). In the first orbit of data (2.4 ks of exposure time), an uncataloged X-ray source was detected at the following position: RA,Dec = 345.6762,+55.081 {RA 23:02:42.3, DEC +55:04:51.7} (J2000) with an uncertainty of 4.5 arcsec radius (90%...Full Text

We imaged the entire field of GRB 051211b (trig 2712) detected by INTEGRAL (Mereghetti et al. GCN 4327) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. Observations started 9 seconds after the GCN notice (and 28.7 s after the GRB). The field had an elevation of 43 degrees above horizon at the begining of the observations....Full Text

A GRB lasting about 80 s has been detected by IBAS in IBIS/ISGRI data at 22:05:44 on December 11 2005. Its refined coordinates (J2000) are: ...Full Text