{
  "bibcode": "2013GCN.15167....1L",
  "body": "Simone Leonini, G. Guerrini, P. Rosi and L.M. Tinjaca Ramirez (Montarrenti \nObservatory, Siena, Italy) report:\n\nWe continue to observe and detect the fading optical afterglow of GRB 130831A \n(Swift trigger 568849, Hagen et al., GCN Circ. 15139) with the automatic 0.53m \nRC \ntelescope + U47 detector at Montarrenti Observatory (Siena, Italy, IAU code \nC88).\n\nWe stacked 4 unfiltered CCD exposures of 60s each and we detect the very faint \nOT at the same position previously measured (GCN 15150) obtaining the \nfollowing \nphotometry at t~34h :\n\n2013 Sep. 01.95733 UT R=20.46 +/- 0.24 \n\nMagnitudes were obtained using Astrometrica software using USNO-B1 catalogue \nfor positions and photometry. An ensemble of 66 stars were used for the \nmagnitude \ncomparison.",
  "circularId": 15167,
  "createdOn": 1378125782000,
  "email": "s.leonini@iol.it",
  "subject": "GRB 130831A: Montarrenti Observatory optical follow-up",
  "submitter": "Simone Leonini at Monarrenti Obs  <s.leonini@iol.it>",
  "eventId": "GRB 130831A"
}