TITLE: GCN CIRCULAR NUMBER: 39315 SUBJECT: GRB 250205A: VIRT Optical Upper Limit DATE: 25/02/13 22:07:44 GMT FROM: Priya Gokuldass at ERAU gokuldap@my.erau.edu
K. Smith (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), and C. Watson (UVI) report:
We observed the field of GRB250205A (Saccardi et al., GCN 39154) with the 0.5m Virgin Islands Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 2025-02-06 starting at 1:04:43 (T-mid ~ T0 + 4.66 hrs). We performed a series of exposures in an R filter with a total exposure of 3560s. The weather conditions were partly cloudy during the hours of observation with an average airmass of 1.06.
We do not detect any source within the XRT position (Kennea et al. GCN 39161). This non-detection is consistent with reported detections (Palmerio et al., GCN 39159; Gompertz et al., GCN 39156; Schneider et al., GCN 39157; Busmann et al., GCN 39169; and de Ugarte Postigo et al., GCN 39160 ), detection of afterglow (Watson et al., GCN 39169) and upper limits (Gompertz et al., GCN 39158; Breeveld et al., GCN 39168; Ferro et al., GCN 39170; and Gupta et al., GCN 39240 ). We report the following 3-sigma upper limit:
T_mid ||Exposure ||Filter ||Limit T+ 4.66 hrs || 3560 s || R || > 21.14
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.
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