TITLE: GCN CIRCULAR NUMBER: 36562 SUBJECT: GRB 240529A: Swift/UVOT Detection DATE: 24/05/29 13:07:35 GMT FROM: Sam Shilling at Lancaster University <shilling.sam@gmail.com> S.P.R. Shilling (Lancaster U.) and Eyles-Ferris (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 240529A 128 s after the BAT trigger (Eyles-Ferris et al., GCN Circ. 36556). A source consistent with the enhanced XRT position (Osborne et al., GCN Circ. 36557) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 22:21:25.97 = 335.35822 (deg.) Dec (J2000) = +51:33:43.0 = 51.56194 (deg.) with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence). Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white 128 278 147 17.07 +/- 0.04 v 671 691 19 16.16 +/- 0.14 b 598 617 19 17.44 +/- 0.16 u 341 591 246 18.27 +/- 0.10 w1 720 1642 97 >18.8 m2 695 1617 97 >18.7 w2 647 1568 117 >19.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.332 in the direction of the burst (Schlegel et al. 1998). View this GCN Circular online at https://gcn.nasa.gov/circulars/36562. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...