TITLE: GCN CIRCULAR NUMBER: 38298 SUBJECT: GRB 241025A: VIRT Optical Upper Limit DATE: 24/11/22 16:34:38 GMT FROM: Priya Gokuldass at ERAU <gokuldap@my.erau.edu> R. Querrard (UVI), P. Gokuldass (ERAU), N. Orange (OrangeWave Innovative Science, LLC), D. Morris (NASA), T. Lombardi (Eckerd College), F. George (ERAU), K. Noonan (UVI), D. Smith (UVI), K. Smith (UVI), C. Watson (UVI) report: We observed the field of GRB241025A detected by Swift (Ambrosi et al., GCN 37859), Fermi (Fermi GBM team, GCN 37860), SVOM (SVOM/GRM team, GCN 37863), and EP (Li et al., GCN 37864) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 2024-10-25 starting at 22:37:31 (T-mid ~T0+21.8 hrs). We performed a series of exposures in an R filter with a total exposure of 2800s. The weather conditions were partly cloudy during the hours of observation with an average airmass of 2.4. We do not detect any source within the enhanced XRT position (Goad et al. GCN 37868). This non-detection is consistent with detections (Jiang et al. GCN 37862; Pereyra et al. GCN 37865; Xu et al. GCN 37866; Qiu et al. GCN 37871; Lipunov et al. GCN 37873; Qiu et al. GCN 37871; Abdi et al. GCN 37882; Alan et al. GCN 37889; Mohan et al. GCN 37890; Vinko et al. GCN 37891; Gupta et al. GCN 37893; Pankov et al. GCN 37912; Moskvitin et al. GCN 37914; Klingler et al. GCN 37919; Moskvitin et al. GCN 37923; Wang et al. GCN 37926; and Rossi et al. GCN 38114) and upper limits (Lipunov et al. GCN 37873) reported by others. We report the following 3-sigma upper limit: T_mid ||Exposure ||Filter ||Limit T+ 21.8 hrs || 2800 s || R || > 19.8 The limit is estimated from comparison to nearby PANSTAARS and is not corrected for Galactic extinction. The VIRT is still in the commissioning phase. We acknowledge financial support from NASA EPSCoR award 80NNSC22M0063, NSF PAARE award 2319415, and NASA EPSCoR award 80NSSC24M0112. We also acknowledge the use of STDWeb interface to verify our result. This message can be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/38298. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...