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GCN Circular 21984

Subject
GRB 171007A: Swift/UVOT Upper Limits
Date
2017-10-10T16:42:31Z (7 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and J. K. Cannizzo (NASA/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 171007A
77 s after the BAT trigger (Cannizzo et al., GCN Circ. 21976).
No optical afterglow consistent with the enhanced XRT position
(Beardmore et al. GCN Circ. 21979)
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            77          227          147         >20.7
u_FC               291          540          246         >20.4
white               77         6966          805         >21.7
v                  620         7377          529         >19.5
b                  546         6761          510         >20.8
u                  291         6556          559         >20.7
w1                 669         6351          333         >20.3
m2                 644         7572          480         >19.9
w2                 596         7172          529         >20.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).
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