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GCN Circular 34399

GRB 230812: Swift/UVOT Detection
2023-08-13T09:01:24Z (9 months ago)
Paul Kuin at MSSL <>
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Paul Kuin (MSSL/UCL) report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 230812
25418 s after the GBM trigger (Roberts et al., GCN Circ. 34391).
The Fermi LAT also detected the trigger (Scotton et al, GCN Circ. 34392).
An candidate optical counterpart was reported (Zheng & Filippenko, GCN
34395; Lipunov et al., GCN Circ 34396; Salgundi et al., GCN Circ. 34397)
near the reported XRT candidate (Kennea, GCN Circ. 34393, Page, GCN Circ.
34394).  A source consistent with the XRT position is detected in the UVOT

Preliminary detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white            25418        31151          390         20.48 +/- 0.18

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.024 in the direction of the burst
(Schlegel et al. 1998).

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