TITLE:   GCN CIRCULAR
NUMBER:  29812
SUBJECT: GRB 210410A: Swift/UVOT Upper Limits (revision)
DATE:    21/04/13 12:29:44 GMT
FROM:    Paul Kuin at MSSL  <npkuin@gmail.com>

Paul Kuin (MSSL/UCL) reports on behalf of the Swift/UVOT team:

In our previous report (Kuin & Melandri, GCN Circ 29787) we made
an error computing T0, which affected our T_start and T_stop times.
Below are the corrected values.

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 3-sigma UL

v                 1070         1095           19         >17.0
b                 4967         5055           85         >19.7
u                 4763         4960          197         >19.9
w1                4556         4755          197         >19.3
m2                4349         4548          197         >19.4
w2                1059         1071           12         >17.0