We observed the field of Swift GRB 120305A (Stratta et al., GCN 13004) with the 0.5m telescope D50 in Ondrejov (Czech Republic), starting at 19:39:12.6UT i.e. 102.6s after the trigger. A sequence of 20s unfiltered images was obtained. We do not detect any new source in individual (limit Rc~17.5) nor coadded images (limit Rc~19.2). This message can be cited. ...Full Text

We report the spectral lag analysis for GRB 120305A (GCN 13004) based on the BAT data. Using 1-ms binned light curves, the spectral lag for the 15-25 keV to 50-100 keV bands is 2.0 +0.6/-0.9 msec, and -2.6 +0.6/-0.4 msec for the 25-50 keV to 100-350 keV bands for both peaks combined. These lag values place this burst in the short burst category. ...Full Text

The Swift/UVOT began settled observations of the field of GRB 120305A 72 s after the BAT trigger (Stratta et al., GCN 13004). No optical afterglow consistent with the enhanced XRT position (Beardmore et al., GCN Circular 13008) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial finding...Full Text

"We observed the location of the short-duration GRB 120305A (GCN 13004) with the EVLA starting on 2012 March 05.98 UT (3.9 hours post-burst). We obtained two hours of observations at a mean frequency of 5.8 GHz. We do not detect any radio source within the latest enhanced XRT position (improved from GCN 13008 with RA = 03:10:08.76, Dec = +28:29:30.2 (J2000), 1.9" uncertainty; http://www.swift.ac.uk/xrt_positions/00516997/)...Full Text

We have analysed 8.2 ks of XRT data for GRB 120305A (Stratta et al. GCN 13004), from 69 s to 24.9 ks after the BAT trigger. The data comprise 85 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 13008). The light curve can be modelled with a power-law decay with a decay index of alpha=2...Full Text

Using 448 s of XRT Photon Counting mode data and 1 UVOT images for GRB 120305A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 47.53639, +28.49191 which is equivalent to: RA (J2000): 03h 10m 8.73s Dec (J2000): +28d 29' 30.9" with an uncertainty of 2.0 arcsec (radius, 90% confidence). This position...Full Text

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"The 2-m Liverpool Telescope robotically followed up GRB 120305A (SWIFT trigger 516997; Stratta et al., GCN 13004) 14.00 min after the GRB trigger time. No optical counterpart is detected within the XRT error circle to the following conservative limits: r' > 21.3 mag (vs USNOB1) i' > 21.0 mag (vs USNOB1). ...Full Text

A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Krushinski, I.Zalozhnich, A. Popov Ural Federal University Hugo Levato and Carlos Saffe Instituto...Full Text

At 19:37:30 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120305A (trigger=516997). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 47.546, +28.493 which is RA(J2000) = 03h 10m 11s Dec(J2000) = +28d 29' 36" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows...Full Text