{
  "submitter": "Martin Jelinek at Inst.Astrophys.Andalucia,Granada  <mates@iaa.es>",
  "eventId": "GRB 070420",
  "email": "mates@iaa.es",
  "body": "M. Jelínek (IAA-CSIC Granada), P. Tristram (MOA,\nUniv. of Canterbury), A. de Ugarte Postigo, J.\nGorosabel, (IAA-CSIC), F. Hale (Earth & Sky,\nTekapo), A. Gilmore, P. Kilmartin (Univ.  of\nCanterbury) and A. J. Castro-Tirado (IAA-CSIC), \non behalf of a larger collaboration,\n\nreport:\n\n\"Following the detection by Swift of the GRB070420\n(Stamatikos et al. GCNC 6330), we obtained V(26),\nR (14) and I (1) -band images at the 0.6m B&C\ntelescope at the Mt. John Observatory on Lake\nTekapo. They were taken starting on Apr 20.33 UT\n(i.e. 1.6 hr post-burst) and continued until Apr\n20.51 UT (~6 hours after the burst).\n\nOur preliminary V-band lightcurve shows a simple\npowerlaw decay between 1.6 and 3.5 hours after the\nburst with alpha~-1.2+-0.2 which is somewhat stee-\nper than the value reported from UVOT (Immler et al.\nGCNC 6336).\n\nAt 4 hours after the GRB we see a sudden rebrigh-\ntening of the order of 1 magnitude in 40min above\nthe value extrapolated from the previous decay.\n\nFurther analysis is in progress.\"\n\nThis message can be quoted.\n\n[GCN OPS NOTE(22apr07): Per author's request,\nthe \"(Stamatikos et al. GCNC 6330)\" was changed to\n\"(Immler et al GCNC 6336)\".]",
  "subject": "GRB 070420: optical rebrightening observed at Mt. John",
  "version": 2,
  "circularId": 6338,
  "bibcode": "2007GCN..6338....1J",
  "editedOn": 1731923484655,
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>",
  "createdOn": 1177094624000,
  "format": "text/plain"
}