{
  "body": "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.\n\nWe 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).\n\nWe obtained multiple exposures in the B, V, and R filters. Exposure lengths were calculated using our automated exposure length scaling model.\n\nWe detect the optical afterglow with coordinates consistent to those reported by OHP/T193 (B. Schneider et al., GCN 36084).\n\nThe coordinates are:\nR.A. (J2000): 12:19:08.12\nDec. (J2000): 56:44:28.70\n\nWe report the photometry below. We estimate a temporal index of about -0.9 and spectral index of about -0.5.\n\nExpLen | Filter | Mag   | Mag Error  | MJD         \n------------------------------------------------\n51.99  | B      | 17.02 | 0.066      | 60414.108\n52.82  | V      | 16.92 | 0.068      | 60414.110\n27.18  | R      | 16.46 | 0.086      | 60414.111\n76.20  | V      | 17.77 | 0.122      | 60414.115\n38.54  | R      | 17.02 | 0.117      | 60414.117\n103.4  | B      | 17.86 | 0.096      | 60414.120\n52.39  | R      | 17.26 | 0.117      | 60414.124\n138.1  | V      | 17.45 | 0.084      | 60414.128\n63.67  | R      | 17.13 | 0.117      | 60414.130\n300    | R      | 18.77 | 0.116      | 60414.204\n300    | R      | 18.61 | 0.101      | 60414.207\n300    | V      | 19.04 | 0.064      | 60414.208\n300    | V      | 19.03 | 0.063      | 60414.208\n300    | R      | 18.89 | 0.126      | 60414.211\n300    | V      | 18.85 | 0.054      | 60414.211\n300    | V      | 18.85 | 0.054      | 60414.211\n300    | R      | 18.54 | 0.091      | 60414.214\n300    | V      | 18.97 | 0.059      | 60414.215\n300    | V      | 18.98 | 0.059      | 60414.215\n300    | R      | 18.92 | 0.134      | 60414.218\n300    | V      | 19.03 | 0.063      | 60414.218\n300    | V      | 19.03 | 0.063      | 60414.218\n300    | R      | 18.94 | 0.138      | 60414.221\n300    | V      | 19.03 | 0.062      | 60414.222\n300    | V      | 19.04 | 0.062      | 60414.222\n300    | R      | 18.67 | 0.106      | 60414.225\n300    | V      | 19.12 | 0.065      | 60414.225\n300    | V      | 19.05 | 0.061      | 60414.225\n300    | R      | 18.67 | 0.106      | 60414.228\n300    | V      | 19.15 | 0.070      | 60414.229\n300    | V      | 19.16 | 0.070      | 60414.229\n300    | R      | 18.96 | 0.137      | 60414.232\n300    | V      | 19.16 | 0.069      | 60414.233\n300    | V      | 19.20 | 0.072      | 60414.233\n300    | R      | 18.72 | 0.113      | 60414.236\n300    | V      | 19.30 | 0.076      | 60414.236\n300    | V      | 19.29 | 0.075      | 60414.236\n300    | V      | 19.16 | 0.071      | 60414.240\n300    | V      | 19.21 | 0.075      | 60414.240\n300x3  | R      | 19.02 | 0.138      | 60414.243\n300x3  | R      | 19.26 | 0.090      | 60414.295\n300x3  | R      | 19.22 | 0.088      | 60414.306\n300x3  | R      | 19.35 | 0.080      | 60414.316\n300x3  | R      | 19.54 | 0.092      | 60414.327\n300x3  | R      | 19.35 | 0.159      | 60414.337\n300x5  | R      | 19.59 | 0.147      | 60414.351\n\nOur images have been calibrated using stars from the APASS catalog.",
  "subject": "GRB 240414A: Skynet Optical Afterglow Observations",
  "eventId": "GRB 240414A",
  "circularId": 36097,
  "createdOn": 1713118793916,
  "submitter": "Dylan Dutton at UNC Chapel Hill <ddutton59@gmail.com>",
  "bibcode": "2024GCN.36097....1D",
  "submittedHow": "web"
}