TITLE: GCN CIRCULAR NUMBER: 37057 SUBJECT: GRB 240805B: Swift/UVOT Upper Limits DATE: 24/08/06 01:35:51 GMT FROM: Mike Siegel at PSU/Swift MOC mhs18@psu.edu
M. H. Siegel (PSU) and M. Williams (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 240805B 88 s after the BAT trigger (Williams et al., GCN Circ. 37043). No optical afterglow consistent with the XRT position (Goad et al., GCN Circ. 37053) 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 first finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 88 238 147 >20.9 u_FC 301 551 246 >19.9 white 88 1719 411 >21.6 v 630 1768 136 >19.4 b 556 1694 117 >19.7 u 301 1669 343 >20.2 w1 679 1818 136 >19.6 m2 1256 1620 39 >19.2 w2 606 1744 136 >20.1
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.087 in the direction of the burst (Schlegel et al. 1998).
View this GCN Circular online at https://gcn.nasa.gov/circulars/37057. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...