{
  "bibcode": "2015GCN.17702....1H",
  "body": "Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill\nObservatory, Varkaus, Finland) report:\n\nWe have detected GRB 150413A optical afterglow at iTelescope\nobservatory T7 and T18 (AstroCamp Observatory, Nerpio, Spain)\nusing T7 0.43-m/6.8  and T18 0.32-m/8.0 astrographs. The observations\nwere started at 2015-04-13 20:29:13 (UT) and stopped at 23:54:26\n(UT). Fifteen unfiltered images and four photometric R filter images with\n120 sec exposure time were made.\n\nThe afterglow was detected at the following position RA 21:41:41.88\nand DEC +71:50:27.9.\n\nThe following magnitude were obtained from the observations using\nUSNO-B1.0 1618-0098208 (R1=14.38) as a comparison star:\n\nTelescope   Tmid(h)+T0    Filter             Exp. time         Mag\nT7                6.611          unfiltered        2x120s          17.2CR  \nT7                6.728          unfiltered        3x120s          17.4CR  \nT7                6.976            R                 2x120s          17.7R \nT7                7.184            R                 2x120s          17.9R \nT18              9.508          unfiltered        4x120s          18.0CR\nT18              9.685          unfiltered        4x120s          18.0CR\nT18              9.904          unfiltered        2x120s          18.0CR\n\n---\nThis email has been checked for viruses by Avast antivirus software.\nhttp://www.avast.com",
  "circularId": 17702,
  "createdOn": 1429022256000,
  "email": "veli-pekka.hentunen@kassiopeia.net",
  "subject": "GRB 150413A: T7 and T18 optical observations",
  "submitter": "Veli-Pekka Hentunen at Taurus Hill Obs,A95  <veli-pekka.hentunen@kassiopeia.net>",
  "eventId": "GRB 150413A"
}