TITLE: GCN CIRCULAR NUMBER: 23127 SUBJECT: GRB180809B TUG T60 observations DATE: 18/08/11 11:25:53 GMT FROM: Yucel Kilic at TUBITAK,TUG Y. Kilic, M. Dindar, T. Ozisik, M. T. Ozkan, S. Ozdemir TUBITAK National Observatory (TUG) TUG T60 robotic telescope (http://tug.tubitak.gov.tr/en/teleskoplar/t60-0, Dindar, M. et al. Exp Astron (2015)) located in TUBITAK National Observatory in Antalya was pointed to GRB180809B (Moss et al. GCN 23105) field 54 seconds after receiving the alert and began to take the exposure. In total, 8 R filter images and 4 B filter images were taken with the FLI PL 3041 CCD camera. No source could be detected on B filter. The GRB180809B is detected in the all the images observed in the R filter within the SWIFT error-box. Astrometry was made with the astrometry.net and magnitudes were estimated using the NOMAD catalog. T-Tmid Date Time Expt. Ra Dec Mag. s UT s R ---------|---------------------|-------|-----------------|---------------|---- 64 2018-08-09 20:31:13 20 19h 58m 48.0s -15d 17m 56.7s 16.07 91 2018-08-09 20:31:39 20 19h 58m 48.0s -15d 17m 56.7s 16.24 117 2018-08-09 20:32:05 20 19h 58m 48.0s -15d 17m 56.7s 16.52 183 2018-08-09 20:33:12 60 19h 58m 48.0s -15d 17m 56.7s 16.29 249 2018-08-09 20:34:18 60 19h 58m 48.0s -15d 17m 56.7s 16.59 316 2018-08-09 20:35:25 60 19h 58m 48.0s -15d 17m 56.7s 16.90 382 2018-08-09 20:36:31 60 19h 58m 48.0s -15d 17m 56.7s 17.20 449 2018-08-09 20:37:38 60 19h 58m 48.0s -15d 17m 56.7s 17.37