[vsnet-grb-info 26243] GRB 200901B: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Sep 2 05:19:35 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 28343
SUBJECT: GRB 200901B: Swift/UVOT Detection
DATE: 20/09/01 20:17:40 GMT
FROM: Alice Breeveld at MSSL-UCL <a.breeveld at ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and B. Sbarufatti (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200901B 176 s after the BAT trigger
(Sbarufatti et al., GCN Circ. 28337).
A source consistent with the XRT position (Sbarufatti et al. GCN Circ. 28337)is detected in the
initial UVOT exposures in the u filter only, but many exposures are smeared, so the magnitudes may
not be reliable.
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al.
2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
v 482 801 58 >18.1
b 431 750 58 >19.1
u 176 426 245 19.3 ± 0.3
w1 531 851 58 >18.1
m2 506 826 58 >17.9
w2 457 776 58 >18.2
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of
E(B-V) = 0.09 in the direction of the burst (Schlegel et al. 1998).
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