TITLE: GCN CIRCULAR NUMBER: 19321 SUBJECT: GRB 160417A: iTelescope T11 optical observations DATE: 16/04/17 17:10:58 GMT FROM: Veli-Pekka Hentunen at Taurus Hill Obs,A95 Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill Observatory, Varkaus, Finland) report: We have detected GRB 160417A optical afterglow at iTelescope observatory T11 (Mayhill, New Mexico) using 0.50-m f/6.8 astrograph and FLI PL11002M CCD. The observations were started at 2016-04-17 05:08:31 (UT). Two unfiltered images with 300 sec exposure time were taken. The afterglow was detected at the position RA 08:01:01.65 and DEC +07:39:47.6. The following magnitude was obtained from the observations using USNO-B1.0 0976-0191477 (R2=16.67) as a comparison star: Tmid(s)+T0 Filter Exp. time Mag Mag. Err. 2996 Clear 2x300s 18.6CR 0.3 --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus