TITLE:   GCN CIRCULAR
NUMBER:  37854
SUBJECT: GRB 241010A: VIRT Optical Upper Limit
DATE:    24/10/24 13:45:27 GMT
FROM:    Priya Gokuldass at ERAU <gokuldap@my.erau.edu>

K. Smith (UVI), P. Gokuldass (ERAU), N. Orange (OrangeWave Innovative Science, LLC), D. Morris (NASA), T. Lombardi (Eckerd College), F. George (ERAU), K. Noonan (UVI), R. Querrard (UVI), D. Smith (UVI) report:

We observed the field of GRB241010A (Dichiara et al., GCN 37755) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 2024-10-11 starting at 08:53:49 (Tmid+ ~23.03 hrs). We performed a series of exposures in R filter with a total exposure of 590s. The weather conditions were partly cloudy during the hours of observation with an average airmass of 1.88. 

We do not detect any source within the enhanced XRT position (Evans et al. GCN 37757). This non-detection is consistent with detections reported by (Izzo et al. GCN 37756) and (Jiang et al. GCN 37771) and upper limits reported by (Mo et al. GCN 37762) and (Lipunov et al. GCN 37764). We report the following 3-sigma upper limit:

T_mid                ||Exposure   ||Filter   ||Limit 
T+23.03  hrs         || 590s      || R       ||>19.74

The limit is estimated from comparison to nearby USNO B1 stars 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. This message can be cited.