Optical and near-infrared sub-arcsecond observations, made with the European Southern Observatory's Very Large Telescope (VLT) at Paranal and New Technology Telescope (+ SofI) at La Silla, of the apparent host galaxy of GRB 031203 (http://gcn.gsfc.nasa.gov/gcn/gcn3/2459.gcn3; GCN 2475), made up to 3 months after the discovery of GRB 031203. The object is located at RA 8h02m30s.2, DEC...Full Text

Continuous monitoring of the host galaxy of the INTEGRAL GRB 031203 (Gotz et al., GCN 2459; Prochaska et al., GCN 2475) has been performed with the ESO telescopes at Paranal and La Silla. We acquired several exposures in the optical and NIR bands during the period December 03 - March 01 (up to three months after the high-energy event)....Full Text

Using the CTIO 4m telescope with MOSAIC2, we have obtained late-time I-band imaging data of the field of GRB 031203 (Gotz et al, GCN 2459) 19, 25, and 77 days after the burst....Full Text

"We have observed the X-ray afterglow of GRB 031203 (Tedds et al., GCN 2490) with the Chandra X-ray Observatory, in a single 21.6 ksec exposure beginning at 21:35 UT on 22 January 2004 (mean epoch 49.1 days post-burst). At the XMM position derived by Tedds et al. (GCN 2490) we observe a single point-like source with a net count rate of 0.56 +/- 0.16 counts per ksec. Converting this count...Full Text

"We have observed the INTEGRAL error box of GRB 031203 (Gotz et al. GCN 2459) with the Danish 1.5-m telescope at La Silla. We have obtained ~50 min I-band exposures at five epochs between Dec 5.6 and Dec 13.6 UT in good seeing conditions (~ 0.8"). We have performed both SExtractor photometry and PSF-matched subtraction of the galaxy (Hsia et al. GCN 2470; Prochaska et al. GCN 2475) coincident...Full Text

The XMM-Newton EPIC coordinates were refined by matching the X-ray sources in the field to the USNO-A2 catalogue. The cross-correlation is extremely good thanks to the long, clean exposure and yields a final source position (J2000) for the X-ray afterglow (the fading source, S1, GCN 2477) of ...Full Text

The first XMM-Newton observation of GRB 031203 began at 2003-12-04, UT 04:09:29 and lasted for 58211 seconds (GCN 2462). The GRB was originally detected by the IBIS instrument on Integral at 2003-12-03, UT 22:01:28 (GCN 2459). ...Full Text

Continued monitoring of the galaxy near the position of GRB 031203 (GCN 2482) with the SMARTS 1.3m telescope + ANDICAM instrument at CTIO:...Full Text

In the "standard" fireball model, ordinary GRBs, XRFs and low-inferred-luminosity GRBs, such as GRB 980425 are intrinsically different. The low-luminosity GRB 031203 (GCN 2460, GCN 2482) has thus been interpreted as a case that "may bridge GRB 980425 ... and cosmological GRBs" (GCN 2483)....Full Text

Preliminary images from both XMM-Newton observations of the field of GRB 031203 are available at the home-page of the XMM-Newton Science Operations Centre: http://xmm.vilspa.esa.es/external/xmm_news/items/grb031203/index.shtml ...Full Text

"On 2003 Dec. 7.52 UT we carried out further VLA observations at 8.5 GHz of the radio source reported earlier (GCN 2473) and which lies within the 6-arcsecond error circle of the XMM source S1 (GCN 2464). The source flux density has decreased by a factor of two since our last report. Given that S1 is also fading (GCN 2477) we conclude that likely the radio source is the afterglow of GRB 031203...Full Text

The coordinates of the galaxy in GCN 2475 were given incorrectly. The correct coordinates are: ...Full Text

"Using the recently commissioned IMACS on the Baade telescope we obtained a 300l grating spectrum of the galaxy laying within 1" of the VLA position (Frail, priv. comm.) of the radio source in the XMM error circle (Santos-Lleo & Calderon #GCN 2464) of the INTEGRAL-discovered GRB 031203 (Gotz et al. GCN 2459)....Full Text

"The position of the radio source in the XMM error box (Frail, priv. communication) is 0.43" E and 0.80" N from the bright source noted in Hsia et al. (GCN 2470). However, as explained in Bloom et al. (GCN 2472) that source itself is unlikely to be the afterglow since it was present in the DSS-II and did not vary significantly in the first night....Full Text

Using SCAM with the NIRSPEC instrument on the KeckII telescope, we imaged the ~50"x50" region surrounding GRB 031203 (Gotz et al., GCN 2459). We acquired exposures in the N3 (~J; 540s), N5 (~H; 360s), and K' (540s) bands with approximately 0.5" seeing in photometric conditions....Full Text

"The object inside the first XMM error circle (Santos-Lleo & Calderon, GCN 2464) reported in Hsia et al. (GCN 2470) is unlikely to be related to GRB 031203 (Gotz GCN 2459) by two accounts. First, as reported in Bailyn et al. (GCN 2468), the source did not vary by more than 0.1 magnitudes from about 4 to 7 hours after the GRB, as is the case for all sources I<22 mag in the XMM error boxes...Full Text

"Using the Very Large Array at 8.5 GHz, we imaged a 2-arcminute radius near the X-ray source S1, detected by the XMM (GCN 2464) within the INTEGRAL error circle (GCN 2459). A single radio source is detected close to the center of S1 at (J2000), RA 08:02:30.22, DEC -39:51:02.8, with conservative errors of +/-0.4 arcsec. This source is not detected in the NRAO VLA Sky Survey at 20-cm. The flux...Full Text

We observed in JHKs filters with SofI at the NTT telescope the field of the INTEGRAL GRB 031203 (Gotz et al. GCN 2459) starting at 4 December 04h54m UT. The object detected by the REM telescope in the H and Ks filters (see Zerbi et al. GCN 2466) was not detected in these images, with upper limits of J=22.2, H=21.1, Ks_1=20.9 and Ks_2=20.2 (we have two exposures in the Ks filter separated by...Full Text

On December 5th, at 06:12 UT, we started observing in JHKs filters with ISAAC at the VLT-UT1 telescope the XMM source S1 (Santos-Lleo & Calderon GCN 2464). In the XMM error box of 6" around S1 we detect the source already seen in the previous night with the NTT (Zerbi et al. GCN 2471, see also Hsia et al. GCN 2470)....Full Text

"We observed the location of the INTEGRAL GRB 031203(Gotz et al. GCN 2459) with 1.0m telescope at Lulin Observatory (Institute of Astronomy, National Central University, Taiwan) from 5 December 2003 18.6 UT to 19.6 UT. There are 6 images taken at I-band with exposure time 300 sec(1 frame) and 600 sec(5 frames). ...Full Text