{
  "bibcode": "2009GCN..9246....1N",
  "body": "Markku Nissinen (Taurus Hill Observatory) and Veli-Pekka Hentunen (Taurus\nHill Observatory) report:\n\n\nWe used 0.35m C14 XLT telescope with SBIG ST-8XME CCD at Taurus Hill Observatory\n(Varkaus, Finland) for follow-up observations of GRB090424. The observations \nwere started on April 24, at 19:59 UTC (5.8 hours after the burst) and stopped\non April 24, at 23:11 UTC. Sixteen unfiltered 600 seconds images were taken. \nWe detected clear optical afterglow object at the position of RA 12h 38m 05s.12 and DEC \n+16o 50' 15\".2 with respect to POSSII F/USNO-B1.0 which is in good correlation \nwith enhanced Swift XRT-UVOT position. Upper limit for the observations is >20.4 mag.\nQuoted upper limit has been derived using POSSII F and USNO-B1.0 field stars \nas reference.\n\nFilter     Tmid(s)      Exp(s)     Mag (CR) USNO-B1.0\n                \nu         20:14:23      600      19.55+/-0.37\nu         20:37:30      600      19.95+/-0.38\nu         21:32:48      600      20.15+/-0.34\n\nA jpeg preview of the observation showing the position of the afterglow is \navailable at this URL: http://cutenews.kassiopeia.net/data/upimages/grb090424_ticks.jpg",
  "circularId": 9246,
  "createdOn": 1240637750000,
  "email": "veli-pekka.hentunen@kassiopeia.net",
  "subject": "GRB 090424: THO optical observations",
  "submitter": "Veli-Pekka Hentunen at Taurus Hill Obs,A95  <veli-pekka.hentunen@kassiopeia.net>",
  "eventId": "GRB 090424"
}