TITLE: GCN CIRCULAR NUMBER: 36097 SUBJECT: GRB 240414A: Skynet Optical Afterglow Observations DATE: 24/04/14 18:19:53 GMT FROM: Dylan Dutton at UNC Chapel Hill <ddutton59@gmail.com> Dylan Dutton, Megan Dubay, Ruide Fu, Donovan Schlekat, Daniel Reichart, Joshua Haislip, Vladimir Kouprianov, Daniel Caton, Lee Hawkins, Dean Glace, Daryl Janzen, Kim Janzen, James Davidson, Edward Murphy, and Carlos Salgado report on behalf of the Skynet Robotic Telescope Network at the University of North Carolina at Chapel Hill. We observed the field of GRB 240414A with three of our North American robotic telescopes. The first detection occurred at 02:36:17 UTC on Apr 14 2024, approximately 15 minutes after the trigger reported by Swift (Caputo et al., GCN 36083). We obtained multiple exposures in the B, V, and R filters. Exposure lengths were calculated using our automated exposure length scaling model. We detect the optical afterglow with coordinates consistent to those reported by OHP/T193 (B. Schneider et al., GCN 36084). The coordinates are: R.A. (J2000): 12:19:08.12 Dec. (J2000): 56:44:28.70 We report the photometry below. We estimate a temporal index of about -0.9 and spectral index of about -0.5. ExpLen | Filter | Mag | Mag Error | MJD ------------------------------------------------ 51.99 | B | 17.02 | 0.066 | 60414.108 52.82 | V | 16.92 | 0.068 | 60414.110 27.18 | R | 16.46 | 0.086 | 60414.111 76.20 | V | 17.77 | 0.122 | 60414.115 38.54 | R | 17.02 | 0.117 | 60414.117 103.4 | B | 17.86 | 0.096 | 60414.120 52.39 | R | 17.26 | 0.117 | 60414.124 138.1 | V | 17.45 | 0.084 | 60414.128 63.67 | R | 17.13 | 0.117 | 60414.130 300 | R | 18.77 | 0.116 | 60414.204 300 | R | 18.61 | 0.101 | 60414.207 300 | V | 19.04 | 0.064 | 60414.208 300 | V | 19.03 | 0.063 | 60414.208 300 | R | 18.89 | 0.126 | 60414.211 300 | V | 18.85 | 0.054 | 60414.211 300 | V | 18.85 | 0.054 | 60414.211 300 | R | 18.54 | 0.091 | 60414.214 300 | V | 18.97 | 0.059 | 60414.215 300 | V | 18.98 | 0.059 | 60414.215 300 | R | 18.92 | 0.134 | 60414.218 300 | V | 19.03 | 0.063 | 60414.218 300 | V | 19.03 | 0.063 | 60414.218 300 | R | 18.94 | 0.138 | 60414.221 300 | V | 19.03 | 0.062 | 60414.222 300 | V | 19.04 | 0.062 | 60414.222 300 | R | 18.67 | 0.106 | 60414.225 300 | V | 19.12 | 0.065 | 60414.225 300 | V | 19.05 | 0.061 | 60414.225 300 | R | 18.67 | 0.106 | 60414.228 300 | V | 19.15 | 0.070 | 60414.229 300 | V | 19.16 | 0.070 | 60414.229 300 | R | 18.96 | 0.137 | 60414.232 300 | V | 19.16 | 0.069 | 60414.233 300 | V | 19.20 | 0.072 | 60414.233 300 | R | 18.72 | 0.113 | 60414.236 300 | V | 19.30 | 0.076 | 60414.236 300 | V | 19.29 | 0.075 | 60414.236 300 | V | 19.16 | 0.071 | 60414.240 300 | V | 19.21 | 0.075 | 60414.240 300x3 | R | 19.02 | 0.138 | 60414.243 300x3 | R | 19.26 | 0.090 | 60414.295 300x3 | R | 19.22 | 0.088 | 60414.306 300x3 | R | 19.35 | 0.080 | 60414.316 300x3 | R | 19.54 | 0.092 | 60414.327 300x3 | R | 19.35 | 0.159 | 60414.337 300x5 | R | 19.59 | 0.147 | 60414.351 Our images have been calibrated using stars from the APASS catalog. View this GCN Circular online at https://gcn.nasa.gov/circulars/36097. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...