[vsnet-grb-info 19011] GRB 170127A: Swift/UVOT Upper Limits

GCN Circulars gcncirc at capella2.gsfc.nasa.gov
Sat Jan 28 07:44:37 JST 2017


TITLE:   GCN CIRCULAR
NUMBER:  20552
SUBJECT: GRB 170127A: Swift/UVOT Upper Limits
DATE:    17/01/27 22:44:14 GMT
FROM:    Frank Marshall at GSFC  <femarsha at khamseen.gsfc.nasa.gov>

F. E. Marshall (NASA/GSFC) and C. B. Markwardt (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 170127A
102 s after the BAT trigger (Markwardt et al., GCN Circ. 20538).
No optical afterglow consistent with the enhanced XRT position
(Evans et al. GCN Circ. 20548)
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

u_FC               102          351          246         >20.5
v                  409         1533          136         >18.7
b                  359         1632          175         >20.4
u                  102         1607          529         >20.7
w1                 458         1583          136         >19.4
m2                 434         1558          136         >20.0
w2                 385         1658          175         >20.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).



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