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GCN Circular 35103

Subject
GRB 231118A: Skynet Optical Afterglow Discovery
Date
2023-11-18T18:45:17Z (17 days ago)
From
Dylan Dutton at UNC Chapel Hill <ddutton59@gmail.com>
Via
Web form
Dylan Dutton, Megan Dubay, Donovan Schlekat, Logan Selph, Daniel Reichart, Joshua Haislip, Vladimir Kouprianov, Daryl Janzen, Arie Verveer, John Kennewell, and Ruide Fu report on behalf of the Skynet Robotic Telescope Network at the University of North Carolina at Chapel Hill.

We observed the field of GRB 231118A with our 0.4m robotic telecope located in Meckering, Australia. The observation began at 17:19:11 UTC on Nov 18 2023, approximately 3 minutes after the trigger.

We obtained multiple expsoures in the B, V, R, and I filters. Exposure lengths were calculated using our automated exposure length scaling model.

We detected a bright object within the uncertainty radius of the Swift localization, at:
R.A. (J2000): 00:19:19.3583
Dec. (J2000): -48:02:24.923

We report the discovery photometry below.

ExpLen | Filter | Mag  | Date         | UTC
-----------------------------------------
3.034s | R      | 14.8 | Nov 18, 2023 | 17:19:30

Our images have been calibrated using stars from the APASS catalog.
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