TITLE: GCN CIRCULAR NUMBER: 39271 SUBJECT: GRB 241128A: VIRT Optical Upper Limit DATE: 25/02/10 20:27:27 GMT FROM: Priya Gokuldass at ERAU <gokuldap@my.erau.edu> R. Querrard (UVI), P. Gokuldass (ERAU), N. Orange (OrangeWave Innovative Science, LLC), B. Gendre (UVI), D. Morris (NASA), T. Lombardi (Eckerd College), F. George (ERAU), D. Smith (UVI), K. Smith (UVI), C. Watson (UVI) report: We observed the field of GRB241128A (Brivio et al., GCN 38367) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 2024-11-29 starting at 22:47:51.703 (T-mid ~ T0 + 30.75 hrs). We performed a series of exposures in an R filter with a total exposure of 1370s. The weather conditions were partly cloudy during the hours of observation with an average airmass of 2.94. We do not detect any source within the enhanced XRT position (Beardmore et al. GCN 38374). This non-detection is consistent with reported detections (Hu et al., GCN 38371;Izzo et al., GCN 38372; Gompertz et al., GCN 38373; Akl et al., GCN 38382; Pankov et al., GCN 38383; Midavaine et al., GCN 38438; and Volnova et al., GCN 38519 ) and upper limits (Lipunov et al., GCN 38380; Shilling et al., GCN 38422; Akl et al., GCN 38382; Pankov et al., GCN 38395; Midavaine et al., GCN 38438; and Volnova et al., GCN 38519 ). We report the following 3-sigma upper limit: T_mid ||Exposure ||Filter ||Limit T+30.75 hrs || 1370 s || R || > 18.6 The limit is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. We acknowledge financial support from NASA EPSCoR award 80NNSC22M0063, NSF PAARE award 2319415, and NASA EPSCoR award 80NSSC24M0112. This message can be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/39271. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...