TITLE: GCN CIRCULAR NUMBER: 36978 SUBJECT: GRB 240730A: Swift/UVOT Upper Limits DATE: 24/07/30 12:36:41 GMT FROM: Paul Kuin at MSSL npkuin@gmail.com
Paul Kuin (MSSL/UCL), R. Caputo and S. B. Cenko (GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 240730A 133 s after the BAT trigger (Cenko et al., GCN Circ. 36976). No optical afterglow consistent with the XRT position in Evans et al., GCN Circ. 36977, 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 133 283 147 >19.1 u_FC 291 541 246 >19.2 white 133 1026 295 >19.1 u 291 541 246 >19.2
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.146 in the direction of the burst (Schlegel et al. 1998).
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