TITLE: GCN CIRCULAR NUMBER: 36115 SUBJECT: GRB 240414A: Swift/UVOT Detection DATE: 24/04/15 13:29:21 GMT FROM: Mike Siegel at PSU/Swift MOC <mhs18@psu.edu> M. H. Siegel (PSU) and R. Caputo (GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 240414A 9754s after the BAT trigger (Caputo et al., GCN Circ. 36083). A source consistent with the XRT position (Obsorne et al., GCN Circ. 36102) and the previously reported optical counterpart (Schneider et al., GCN Circ. 36084, Aryan et al., GCN Circ. 36094, Dutton et al., GCN Circ. 36097, Xu et al., GCN Circ. 36105, Pankov et al., GCN Circ. 36113) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 12:19:08.09 = 184.78370 (deg.) Dec (J2000) = +56:44:28.6 = 56.74127 (deg.) with an estimated uncertainty of 0.4 arc sec. (radius, 90% confidence). 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 b 9754 10628 853 19.23+/-0.07 uvm2 15403 16303 885 >20.33 u 22136 22862 707 19.29+/-0.11 v 62457 62769 302 >19.60 uvw1 16310 22129 1262 20.04+/-0.18 uvw2 26698 27465 755 >20.54 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998). View this GCN Circular online at https://gcn.nasa.gov/circulars/36115. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...