[vsnet-grb-info 26465] GRB 201006A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28565
SUBJECT: GRB 201006A: Swift/UVOT Upper Limits
DATE:    20/10/06 21:07:13 GMT
FROM:    Frank Marshall at Swift/UVOT  <marshall at milkyway.gsfc.nasa.gov>

F. E. Marshall (NASA/GSFC) and J. D. Gropp (PSU)

report on behalf of the Swift/UVOT team:



The Swift/UVOT began settled observations of the field of GRB 201006A

88 s after the BAT trigger (Gropp et al., GCN Circ. 28560).

No optical afterglow consistent with the XRT position

(Goad et al. GCN Circ. 28562)

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            88          238          147         >21.1

u_FC               300          549          246         >20.2

white               88         1539          385         >21.0

v                  629         1423           97         >18.9

b                  555         1521           97         >19.8

u                  300          722          265         >20.3

w1                 678         1472           97         >18.7

w2                1205         1225           19         >17.3



The magnitudes in the table are not corrected for the Galactic extinction

due to the reddening of E(B-V) = 1.27 in the direction of the burst

(Schlegel et al. 1998).