{
  "bibcode": "2014GCN.16171....1G",
  "body": "K. Gazeas & K. Sapountzis (National University of Athens) report:\n\nWe performed photometric observations on DG CVn (trigger 596958)\nin R band (optical), using the University of Athens Observatory (0.4 m\nf/8 Cassegrain Reflector, equipped with a ST10XME CCD camera).\n\nDay/Time of observation: 23/24 April 2014, 22:20-03:00 UT (JD:\n2456711.45-2456711.63)\nFilters: R (Bessell)\n\nWe also conclude that the trigger is consistent with the flare star DG\nCVn , although we cannot exclude the possibility of being a field GRB.\nNevertheless, photometry of DG CVn reveals significant enhancing at\nthe OT and subsequent fading of the flare indicating an interesting\nstellar activity. The photometric variability of the DG CVn with\nrespect to the field standard star GSC 2003:0711, shows a gradual  \ndecay with a rate of 0.92 mag/hour for the first hour of observation  \nafter the peak (23:30-00:30 UT), followed by a decay rate of 0.34  \nmag/hour for the rest 2.5 hours of observation (00:30-03:00).\n\nThe R-band light variability of DG CVn, is shown in the following link:\nhttp://users.uoa.gr/~ksapountzis/DGCVn_UoA_Greece.jpg\n\n[GCN OPS NOTE(25apr14):  This circular was delayed ~5 hours until\nand entry in the vetted list was created.]\n[GCN OPS NOTE(26apr14):  Per author's request, the last paragraph\n(with the lightcurve URL) was added.]\n[GCN OPS NOTE(30apr14): Now that it is known that this is about the\nSwift-BAT trigger on the DG CVn flare star, the strings \"GRB 140423A\"\nin the Subject-line and in the first paragraph were changed to \"DG CVn\"\nto reflect that.]",
  "circularId": 16171,
  "createdOn": 1398367553000,
  "email": "kgaze@phys.uoa.gr",
  "subject": "DG CVn: optical observations",
  "submitter": "K.Gazeas at Nat U of Athens  <kgaze@phys.uoa.gr>"
}