GCN Circular 31005

N. P. M. Kuin (UCL-MSSL) and J. Gropp (PSU) reports on behalf of the
Swift/UVOT team:

We report here the early Swift/UVOT photometry of GRB 211024B (Gropp et
al.,
GCN Circ. 30980
Not found
 
 
; Zhu et al. GCN Circ. 30984
Not found
 
 
; Lien et al. GCN Circ 30989;
Evans et al. GCN Circ 30994; Kann et al. GCN Circ. 30995
Not found
 
 
) at the position
reported by Zhu et al. (GCN Circ. 30984
Not found
 
 
).


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

v                 6237       6437           197            19.2 +/- 0.4
v                12395      24343          1665            20.4 +/- 0.4
b                 5826       5927           197            20.0 +/- 0.4
u                 5621       5821           197            18.8 +/- 0.2
u                 6852       7052           197            19.3 +/- 0.3
w1                6647       6847           197            19.2 +/- 0.3
m2                6442       6642           197            19.3 +/- 0.3
w2                6032       6232           197            20.1 +/- 0.5
w2                7260       7360            98            19.5 +/- 0.5


The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening in the direction of the burst.