TITLE: GCN CIRCULAR NUMBER: 35374 SUBJECT: GRB 231214A: Swift/UVOT Upper Limits DATE: 23/12/16 13:23:14 GMT FROM: Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk> A. A. Breeveld (UCL-MSSL) and Brivio (INAF-OAB) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 231214A (Fermi GBM Team, GCN Circ. 35334; Kocevski et al., GCN Circ. 35342; Navaneeth et al., GCN Circ. 35348), 442 s after the BAT trigger (Brivio et al., GCN Circ. 35335). No optical afterglow consistent with the XRT position (Evans et al., GCN Circ. 35341) 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 are: Filter T_start(s) T_stop(s) Exp(s) Mag white 442 4733 382 >20.7 v 4944 4998 54 >18.1 b 4329 4528 197 >19.6 u 4123 4322 197 >19.3 w2 4739 4939 197 >19.5 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.060 in the direction of the burst (Schlegel et al. 1998). View this GCN Circular online at https://gcn.nasa.gov/circulars/35374. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...