"We observed the error region of GRB 051227 (Barbier et al. GCN 4397) with the very wide-field camera WIDGET located at Akeno, Japan. WIDGET monitored the region continuously with repeat of unfiltered 5-second exposures between 187 minutes before and 12 minutes after the burst trigger. We did not find any optical emission at the Swift XRT source position (Beardmore et al. GCN 4402). The...Full Text

We began observations of GRB 051227 (Barbier et al, GCN 4397) beginning December 28th, 06:20:31 December 28 06:20:31UT and ending 07:36:35UT approximately 12 hours after the Swift Trigger (trigger=174738). We obtained 15 300-second exposures in R-band with the SARA 0.9m telescope on Kitt Peak. Coadding all exposures and comparing with the USNO A2.0 catalog reveals no new source down to a...Full Text

"We re-observed the error circle of GRB 051227 with Gemini/GMOS starting on 2005 Dec. 30.35 UT (62.6 hr after the burst) for a total of 30 min in r-band. Source S1 is clearly detected in our summed image with r=25.8+/-0.2 mag....Full Text

"The field of GRB 051227 (Barbier et al., GCN 4397) was observed with the 3-color Mitsume 50cm Telescope at Okayama, Japan from 19:13 UT to 19:21 UT ( 1.1 to 1.4 hours after the burst), until the observation was terminated by the cloudy weather. Coadding the 14 frames of 60 sec exposure, we did not detect a source at the position of the afterglow candidate noted by Malesani et al. (GCN 4404...Full Text

"We used the Very Large Array to observe the Swift burst GRB 051227 (GCN 4397) at a frequency of 8.46 GHz on 2005 December 28.57 UT and December 29.22 UT. No radio emission is detected within the XRT error circle (GCN 4402). At the position of the optical afterglow (GCN 4408) the formal flux density values are -21 +/- 28 uJy and 18 +/- 25, respectively....Full Text

"We re-observed the error circle of GRB 051227 with Gemini/GMOS starting on 2005 Dec. 29.36 UT (38.6 hr after the burst) for a total of 25 min in r-band. Digital image subtraction performed on this image and the one obtained on the previous night (13.9 hr after the burst; GCN 4410) confirms that source S1 has faded, as indicated by Malesani et al. (GCN 4412) and D'Avanazo et al. (GCN 4413)...Full Text

We further analyzed our VLT images (Malesani et al., GCN 4404, GCN 4412) of GRB 051227 (Barbier et al., GCN 4397; Hullinger et al., GCN 4400; Barthelmy et al., GCN 4401). Optimal subtraction performed with the ISIS package on our two set of images (taken on Dec 28.2 and 29.2 UT) clearly shows a dimming of the source S1 (Malesani et al., GCN 4404). A figure showing the result of the subtraction...Full Text

We observed again the field of GRB 051227 (Barbier et al., GCN 4397; Hullinger et al., GCN 4400; Barthelmy et al., GCN 4401) with the ESO VLT-UT2 equipped with FORS1. Observations started on 2005 Dec 29.1899 (1.4 d after the GRB), and secured 1 hour of net exposure in the R band....Full Text

We have created summed images from Swift UVOT exposures of GRB 051227 (Barbier et al., GCN 4397) taken through each of the broadband filters. No source was detected at the XRT position (Beardmore et al. GCN 4402) or the R-band VLT position (Malesani, GCN 4404) down to the following 5-sigma upper limits (no correction has been made for the expected visual extinction of about 0.14 magnitudes)...Full Text

"We imaged the error circle of GRB 051227 (GCN 4397, GCN 4401) with GMOS on the Gemini-north telescope starting on 2005, Dec. 28.33 UT (13.88 hr after the burst). A total of 25 min were obtained in r-band in good seeing conditions (0.75"). Within the refined XRT position (GCN 4402) we detect source S1 (GCN 4404, GCN 4407, GCN 4408) at coordinates (J2000): ...Full Text

"We obtained 2x1500 sec spectra of the object found inside, S1 (GCN 4404, GCN 4407, GCN 4408), and the galaxy north-east, G1 (GCN 4408), of the XRT error box of GRB 051227 (GCN 4402) with Keck II (+ DEIMOS). We detect absorption lines at the position of the galaxy which we identify as Ca II H&K at z = 0.714. We also detect emission lines which we identify as [O II] 3727 and H beta. ...Full Text

"Starting at 2005-12-28 06:16:19 UT, we began imaging the field of GRB 051227 (GCN 4397, GCN 4400, GCN 4401, GCN 4403) with the Magellan 6.5m + LDSS3 instrument (*). At an airmass of 2.1 the effective seeing was 0.62 arcsec. In each five minute exposure we detect the faint VLT sources noted by Malesani et al. (GCN 4404, GCN 4407) near the XRT localization (Beardmore et al., GCN 4402)...Full Text

The field of GRB 051227 (Barbier et al., GCN 4397; Barthelmy et al., GCN 4401; Sakamoto et al., GCN 4403) was observed at two epochs with the ESO-VLT UT2, equipped with FORS1. Exposure was 20 minutes per epoch, with mean times 10.4 and 12.5 h after the GRB trigger....Full Text

We have imaged the field of GRB 051227 (Barbier et al., GCN 4397; Hullinger et al., GCN 4400; Barthelmy et al., GCN 4401; Sakamoto et al., GCN 4403) with the automated Palomar 60-inch telescope. Observations consisted of 30 x 180 s images in the Kron R filter taken at a mean epoch of approximately UT 28 December 05:50 (11.7 hours after the burst)....Full Text

"We are observing the Swift XRT position (Beardmore et al., GCN 4402) of GRB 051227 in the SDSS r filter with RETROCAM on the MDM 2.4m, a medium-sized telescope on Kitt Peak, Arizona. Beginning on Dec. 28 03:55 UT, or 9.9 hours after the burst, our first 15 minutes of exposure yields no detection to a limit R > 23, referenced to the SDSS photometry in the field (Cool et al., GCN 4399)...Full Text

We observed the field of the hard (and possibly short) GRB 051227 (Barbier et al., GCN 4397; Barthelmy et al., GCN 4401; Sakamoto et al., GCN 4403) using the ESO VLT-UT2 (Kueyen) equipped with the FORS1 instrument. Observations started on 2005 Dec 28, 04:22 UT (~10.3 h after the GRB), in the R band. Observations were conducted at high airmass and moderate seeing (1.5")....Full Text

The HETE FREGATE instrument detected the initial peak of GRB 051227 (Swift Trigger 174738; Barbier, et al., GCN 4397) as an untriggered event....Full Text

We have analysed the first 3 orbits of XRT data from GRB 051227. A 2.8ks photon counting mode image provides a refined XRT position: ...Full Text

Continuing the analysis of GRB 051227, we point out the possibility that this is a short burst. We do not have the full data set downloaded for this burst yet (only T-60 to T+120 sec), but we wish to get this speculation out to the follow-up community to facilitate observations as soon as possible (i.e. CA coast and Hawaii big glass). We base this on 2 observations: ...Full Text

Using the full data set from the recent telemetry downlink, we report further analysis of Swift-BAT GRB 051227 (trigger #174738) (Barbier, et al., GCN 4397). The ground-analysis position is RA,Dec 125.230,+31.953 {RA 08h 20m 55.2s,DEC +31d 57' 12"} (J2000) with an uncertainty of 1.8 arcmin (radius, 90%, stat+sys). T90 is 8.0 +- 0.2 sec. The partial coding fraction is 97%. The lightcurve...Full Text