{
  "eventId": "XRF 040701",
  "bibcode": "2004GCN..2638....1P",
  "submitter": "Elena Pian at IASF,CNR,Bologna  <pian@bo.iasf.cnr.it>",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
  "editedOn": 1777052988233,
  "circularId": 2638,
  "email": "pian@bo.iasf.cnr.it",
  "subject": "XRF040701: Optical Observations at ESO",
  "createdOn": 1092075333000,
  "body": "E.  Pian, J.  Fynbo , U. G. Joergensen, A. Levan, N.  Masetti, E. Palazzi,\nF. Patat, E. Rol, J. Hjorth, B. Lindgren Jensen, P. Mazzali, C.\nKouveliotou, K. Nomoto, E. Cappellaro, on behalf of a larger\ncollaboration, report:\n\nThe field of source CXOU J204816.1-401108 (Fox et al.  GCN 2626), detected\nin the error box of XRF040701 (Barraud et al., GCN 2620), was imaged with\nthe ESO Danish 1.5m telescope at La Silla on 2004 Jul\n03,15,16,17,19,23,24, Aug 4,5, and with the VLT and FORS1 on 2004 Jul\n23.16, 23.33, 30.35 UT in the R band. The VLT imaging of Jul 23 was done\nunder excellent seeing conditions (0.6\").\n\nBoth R-band photometry and PSF-matched image subtraction of the galaxy at z\n= 0.2146 underlying CXOU J204816.1-401108 (Kelson et al.  GCN 2627)  rule\nout flux variations larger than a few hundredths of a magnitude.\n\nConsidering that we determine a lower limit of R~17.9 for the galaxy\nbrightness, an event similar to supernova 1998bw would produce an observed\nvariation of about 6% from explosion to maximum light. Therefore, our data\nappear marginally to exclude a supernova similar to 1998bw (see also\nBerger et al.  GCN 2631), but not a weaker one, like SN2002ap or SN1994I.\n\nA 2hr VLT+FORS1+300V spectrum of the galaxy taken on Jul 23 does not\nreveal conspicuous supernova features. The 2 galaxies located at ~4\" West\nand ~6\" South of the galaxy underlying CXOU J204816.1-401108 have\nredshifts 0.215 and 0.17, respectively.\n\nThis message can be cited.",
  "version": 2
}