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GCN Circular 35233

Subject
GRB 231129A: Swift/UVOT Upper Limits
Date
2023-11-30T13:17:20Z (3 months ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
Via
email
A. A. Breeveld (UCL-MSSL) and J. D. Gropp (PSU) report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 231129A (Gropp et al., GCN circ. 35208; Mereghetti et al., GCN circ. 35209; Zhang et al., GCN circ. 35210) 120 s after the BAT trigger (Gropp et al., GCN Circ. 35208).
No optical afterglow consistent with the XRT position (Goad et al., GCN Circ. 35220) 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           120          270          147         >20.5
white              120         4158          344         >20.8
v                 4369         4568          197         >18.9
b                 3753         3953          197         >19.4
u                  333         5122          275         >19.9
w1                4780         4980          197         >18.8
m2                4574         4773          197         >18.9
w2                4164         4364          197         >19.2

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.164 in the direction of the burst (Schlegel et al. 1998).

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