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GCN Circular 35069

Subject
GRB 231111A: Swift/UVOT Detection
Date
2023-11-17T00:10:52Z (3 months ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
Via
email
GRB 231111A: Swift/UVOT Detection

S. J. LaPorte (PSU) and A. Melandri (INAF-OAR)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 231111A
165 s after the BAT trigger (Melandri et al., GCN Circ. 34981).
A source consistent with the XRT position
(Evans et al., GCN Circ. 34991)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  19:20:45.25 = 290.18856 (deg.)
    Dec (J2000) = +52:26:10.5  =  52.43624 (deg.)
with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).

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

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

b                   26598       27505        885         >20.41
uvm2                34150       34575        418         >20.05
u                     180         418        234          16.52
v                   33541       34144        590         >19.85
uvw1                38947       39736        776         >20.24
uvw2                27512       85141       1176         >20.65


The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.117 in the direction of the burst
(Schlegel et al. 1998).

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