We observed the field of the GRB 081203A (A. M. Parsons et al., GCN 8595) in the Rc-band with the 6-m telescope of the SAO RAS in Caucasus. In total 15 3-min exposures were obtained starting from 01:42 7 Dec. 2008 UT (T-T_0 = 3.49 days). We clearly detected an object at the position of the UVOT optical transient (M. De Pasquale and A. Parsons, GCN 8603). Calibration based on the SDSS stars yields...Full Text

For these bright GRBs, a 50s UV grism exposure is now inserted following the first 150s finding chart in the white filter. Roughly half of all Swift GRBs are sufficiently bright to trigger the use of the grism. The UVOT grism covers the spectral range 1700 - 5500 A, and can provide useful spectra for GRBs brighter than about V~13. Further details are available in Kuin et al. (2008...Full Text

We observed the field of GRB 081203 (Parsons et al, GCN 8595) with the AZT-11 telescope of CrAO observatory starting Dec. 03 (UT) 15:44:29 under good weather conditions and seeing of about ~2 arcsec. Several exposures were obtained in VRI bands up to 17:13:56 and then between Dec. 04 (UT) 01:19:13 - 02:47:51. Coordinates of the afterglow are RA(J2000)= 15:32:07.58 Dec(J2000)= +63:31:14...Full Text

We have searched for optical and VHE-neutrino emission in the field of GRB 081203A (A. M. Persons et al., GCN 8595) around the BAT-triggered GRB time (T0) with one of the light collector units in the Ashra-1 detector (http://www.icrr.u-tokyo.ac.jp/~ashra) on Mauna Loa on Hawaii Island (latitude = 19.5412 deg. N, longitude =155.5676 deg. W, altitude =3330m). The Ashra-1 light collector unit has...Full Text

We observed the field of GRB 081203A(Parsons, et al., GCN 8595) with the optical 3-color imager attached to the 105cm Murikabushi Telescope at Ishigakizima Astronomical Observatory in Japan from UT 19:52, 5.9 hours after the trigger. In the co-added images of Ic, Rc, and g' bands, we detected a fading point source and measured its magnitude. Photometric calibration was performed using the GSC2...Full Text

We used the AMI large array (the rebuilt/upgraded Ryle Telescope) in the band 14 - 17 GHz to observe the field of the optically bright GRB 081203A (GCN 8595). There was no detection of the afterglow on either of two observations. The measured flux densities at the optical position are: 2008 Nov 04.26 116 +- 300 microJy 2008 Nov 05.24 80 +- 200 microJy (cf Chandra & Frail, GCN 8613, for...Full Text

We performed optical imaging observation of the field of GRB 081203A (Parsons, et al., GCN 8595) with the 3-color 50cm MITSuME Telescopes at Akeno Observatory and Okayama Astrophysical Observatory from UT 17:50 to UT 20:55, 3.9 hours after the trigger. In the co-added images of Rc, and g' bands, we detected the optical afterglow detected with UVOT (Parsons, et al., GCN 8595). Photometric calibration...Full Text

We have observed GRB 081203A (Parsons et al., GCN 8595) with Xinglong TNT telescope from Dec.03th,13:57:11(UT), 6.43 hr after the burst to Dec.03,22:19:37.67 (UT). A series of R band and V band have been obtained. The optical afterglow was clearly detected in all the images. Further observations of GRB 081203A were also made with Xinglong TNT telescope from Dec.04th,21:29:30.409(UT). The OT...Full Text

Skynet observed the localization of GRB 081203A (Parsons et al., GCN 8595) with the 14" GORT telescope at Hume Observatory in California beginning 122 seconds after the trigger (101 seconds after notification) in RI. Only five exposures were taken before morning twilight. We detect the afterglow (Parsons et al., GCN 8595) in all five exposures. Calibrated to five USNO B1 stars, we find: mean...Full Text

We observed the field of GRB 081203 (Parsons et al, GCN 8595) with the Z-600 telescope of Mt. Terskol observatory between (UT) Dec.03 14:29-14:38 (unfiltered exposures of 15 s), Dec.03 14:50 - Dec.04 01:45 (R-band exposures of 60 s), and starting (UT) Dec.04 15:27. In mid time Dec.04 (UT) 00:50 the afterglow is detected on combined images and R=19.5 +/-0.2. In mid time Dec. 04 (UT)...Full Text

"We used the Very Large Array to observe the field of view toward optically bright GRB 081203A (GCN 8595) at a frequency of 8.46 GHz on 2008 Dec 04.39 UT. The GRB radio afterglow is undetected and the peak radio flux at the UVOT position (GCN 8595) is 76 ± 54 uJy. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by...Full Text

The long GRB 081203A (Parsons et al., GCN 8595, Ukwatta et al., GCN 8599) was detected by Konus-Wind in the same trigger record as GRB 081203B (Copete et al., GCN 8600, 8602; Golenetskii et al., GCN 8610) at ~T0(KW)+260s. (T0(KW)=49890.368 s UT (13:51:30.368). Correcting for the propagation time delay from Wind to Swift of 0.7s, one sees that T0(BAT) corresponds to T0(KW)+339.9s). Since...Full Text

We have analysed the first 3 orbits of Swift-XRT data obtained for GRB 081203A (trigger #336489, Parsons et al., GCN 8595), that includes 550 s of Windowed Timing (WT) and 15.5 ks of Photon Counting (PC) mode data, respectively, between 87 s and 16 ks after the trigger. The UVOT-enhanced XRT position was given by Evans et al. in GCN 8598. The light-curve can be modelled with a broken power-law...Full Text

Igor Volkov, Astronomical Institute of the Slovak Academy of Sciences, 059 60 Tatranska Lomnica, Slovak Republic; e-mail: volkov@ta3.sk ...Full Text

Swift UVOT began settled exposures of GRB 081203 (trigger 336489, Parsons et al, GCN circular 8595) 93 s after the burst trigger. A bright optical transient is detected at the following coordinates: RA = 15h 32m 07.58s (=233.031580), Dec = +63d 31m 14.9s (=63.520810) J2000 with an uncertainty of 0.5'' (90% confidence level). This position is consistent with the XRT refined error circle (Goad...Full Text

The Swift/UVOT obtained a 49s UV grism spectrum of GRB 081203A starting 249 s after the BAT trigger (Parsons et al. GCN 8595). The spectrum covers the wavelength range from 2000-4900 A. Longward of 2850 A in the quicklook spectrum there is an approximately flat continuum of 2.5e-14 erg s-1 cm-2 A-1 with a strong absorption at 3850 A. If the 2850 A cutoff is identified with...Full Text

We report the detection of a GRB candidate by the BAT Slew Survey (BATSS) in the slew that started at 13:52:02 UT. This is 309 sec before the trigger time for the GRB that followed (A. M. Parsons et al, GCN 8595), which occurs at a different location and should hereafter be referred to as GRB 081203B. The ground-calculated position of GRB 081203A is RA, Dec = 228.789, +44.427 deg, which...Full Text

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Using 2654 s of XRT Photon Counting mode data and 4 UVOT images for GRB 081203, 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 = 233.0327, +63.5207 which is equivalent to: RA (J2000): 15h 32m 7.84s Dec (J2000): +63d 31' 14.4" with an uncertainty of 1.7 arcsec (radius, 90% confidence). This position...Full Text

We observed the field of GRB 081203 detected by SWIFT ( with the Z-600 telescope of Mt. Terskol observatory. A few first unfiltered images confirm the presence bright afterglow detected by UVOT Parsons et al, GCN Parsons) in coordinates (J2000) 15 32 07.75 +63 31 15.04. A preliminary photometry at Dec.03 (UT) 14:29:30 against USNO-A2.0 (R) is 14.9 mag. Observation is continuing. ...Full Text