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GCN Circular 42288

Subject
GRB 251014B: Swift/UVOT Upper Limits
Event
GRB 251014B
Date
2025-10-15T14:32:04Z (3 days ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
Via
email
A.A. Breeveld (UCL-MSSL) and N. J. Klingler (GSFC/UMBC/CRESSTII) report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 251014B
49976 s after the Swift-BAT/GUANO trigger (Ronchini  et al., GCN 42263).
No new optical afterglow is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures binned is:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white           49976       73120         7974         >23.0

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.014 in the direction of the burst (Schlegel et al. 1998).
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