{
  "bibcode": "2004GCN..2545....1T",
  "body": "G. Tagliaferri, D. Malesani, G. Chincarini, S. Covino, D. Fugazza, M. \nDella Valle, L.A. Antonelli, S. Campana, A. Cucchiara, P. D'Avanzo, F. \nFiore, G.L. Israel, D. Lazzati, A. Simoncelli, L. Stella, K. Stamatis, \nF.M. Zerbi, on behalf of a larger collaboration, report:\n\nContinuous monitoring of the host galaxy of the INTEGRAL GRB 031203 \n(Gotz et al., GCN 2459; Prochaska et al., GCN 2475) has been performed \nwith the ESO telescopes at Paranal and La Silla. We acquired several \nexposures in the optical and NIR bands during the period December 03 - \nMarch 01 (up to three months after the high-energy event).\n\nWe confirm the variability reported by Bersier et al. (GCN 2544). The \nvariability pattern is fully consistent with the evolution of a \n98bw-like SN at z=0.105 (as measured in our spectra and in agreement \nwith Prochaska et al., GCN 2482), peaking approximately 20 days after \nthe burst in the R band. The contribution of such emission is roughly \n30% of that of the host galaxy, as determined from the late-time photometry.\n\nSpectra with the VLT were taken on Dec 20, Dec 30 and Mar 01 (17, 27, \nand 90 days after the GRB respectively) in an attempt to fully \ncharacterise the observed variability. Subtraction of the late-time \nspectrum (taken 90 days after the GRB) from the spectra taken close to \nthe maximum of the rebrightening reveals the emergence of a spectrum \nclosely resembling that of SN 1998bw. We therefore conclude that the \nobserved rebrightening is due to a supernova (Malesani et al. in \npreparation).\n\nWe thank the staff at the ESO telescopes (both Paranal and La Silla) for \nthe extensive work in this campaign, and in particular Malvina Billeres, \nOlivier Hainaut, Swetlana Hubrig, Chris Lidman, Gianni Marconi, and \nThomas Szeifert.\n\nThis message may be cited.",
  "circularId": 2545,
  "createdOn": 1079444929000,
  "email": "malesani@sissa.it",
  "subject": "GRB 031203: spectoscopic evidence for a 1998bw-like SN",
  "submitter": "Daniele Malesani at SISSA-ISAS,Trieste,Italy  <malesani@sissa.it>",
  "eventId": "GRB 031203"
}