{
  "createdOn": 1200049696000,
  "email": "valenti@fe.infn.it",
  "editedOn": 1746478306986,
  "subject": "Early OT detection of XRF in NGC 2770 in Asiago frames",
  "version": 2,
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
  "circularId": 7163,
  "format": "text/plain",
  "bibcode": "2008GCN..7163....1V",
  "body": "S. Valenti, M. Turatto, H. Navasardyan, S. Benetti and E. Cappellaro report:\n\nThe optical counterpart of the transient source in NGC 2270 (cfr. GCN 7159)\nwas present on images of SN2007uy taken with the 1.8m telescope of the Asiago\nObservatory (+AFOSC) on Jan. 10.01 (10.5h after the Swift detection) and\nnot visible\n(limit magnitude  ~ 21) on Jan.  7.00.\nThe transient was of mag ~ 19 in V,   fainter than SN 2007uy by 3 and 2.8\nmagnitude in V and R,\nrespectively.  Following the report of J. Deng and Y. Zhu (GCN7160) that\nthe transient was roughly 2 magnitudes  fainter than SN2007uy on Jan. 10.76,\nin R band, it seems that the luminosity of the transient is rising\nrapidly, supporting the very fortunate possibility  that Swift has\nobserved, in\nreal time, the explosion of a massive star. A image of the transient can\nbe found at:\nhttp://www.eso.org/~svalenti/homepage/transient.jpg",
  "eventId": "SN2008D",
  "submitter": "Stefano Valenti at U di Ferrara,Italy  <valenti@fe.infn.it>"
}