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GCN Circular 17970

Subject
GRB 150626B: Swift/UVOT Upper Limits
Date
2015-06-27T13:38:34Z (9 years ago)
From
Massimiliano de Pasquale at IASF-Palermo <m.depasquale@ucl.ac.uk>
M. De Pasquale (UCL-MSSL) and L. M. McCauley (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 150626B
131 s after the BAT trigger (McCauley et al., GCN Circ. 17966).
No optical afterglow consistent with the XRT position (Goad et al.
GCN Circ. 17968) 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           131          281          147         >20.7
u_FC               289          539          246         >20.1
white              131         6476          628         >21.6
v                  620         6887          529         >19.5
b                  545         7647          469         >20.8
u                  289         7502          756         >20.7
w1                 669         7298          529         >20.4
m2                 644         7092          510         >20.3
w2                 595         6682          346         >20.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).
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