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GCN Circular 16964

Subject
GRB 141026A: Swift/UVOT Upper Limits
Date
2014-10-26T21:57:26Z (10 years ago)
From
Lea Hagen at PSU <lea.zernow.hagen@gmail.com>
L. M. Z. Hagen (PSU) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 141026A
166 s after the BAT trigger (Hagen et al., GCN Circ. 16950).  No optical
afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 16956)
or the likely optical afterglow (Littlejohns et al. GCN Circ. 16952, Varela
et al. GCN Circ. 16953, Gorosabel et al. GCN Circ. 16954, Perley et al. GCN
Circ. 16955, Butler et al. GCN Circ. 16962) 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 initial exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white (fc)         165          208           83         >19.98
white             3462         5667          688         >21.45
v                  144         5962          290         >19.34
b                 3826         5463          393         >20.48
u                 3621         5258          393         >20.15
uvw1              4852         5052          196         >19.61
uvm2              4647         4847          196         >19.58
uvw2              4237         5873          393         >20.26

The magnitudes in the table are not corrected for the Galactic extinction
due to the substantial reddening of E(B-V) = 0.19 in the direction of the
burst (Schlegel et al. 1998).
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