Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 31222

Subject
GRB 211211A: Swift/UVOT detection
Date
2021-12-12T18:19:57Z (2 years ago)
From
Alexander Belles at PSU/Swift <aub1461@psu.edu>
A. Belles (PSU) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 211211A
92 s after the BAT trigger (D'Ai et al., GCN Circ. 31202).
A fading source consistent with the XRT position
(Beardmore et al. GCN Circ. 31205) and optical position
(Zheng & Filippenko, GCN Circ. 31203) is detected in the initial
UVOT exposures.

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
wh_FC               92          242          147      18.93+/-0.22
wh                3906         4106          196      18.33+/-0.09
wh               68215        68397          179            >19.74
b                 3701         3901          196      18.97+/-0.28
b                16837        17437          587      19.27+/-0.28
b                67303        68210          885      19.70+/-0.24
v                 4317         4517          196            >18.33
u                 3496         5012          275      18.26+/-0.16
u                15924        16831          885      18.44+/-0.11
u                57177        74247          362            >18.89
w1                4727         4927          196      17.46+/-0.16
m2                4522         4721          196      17.58+/-0.19
m2               21678        22153          467      18.18+/-0.18
w2                4112         4312          196      17.30+/-0.15
w2               61756        62656          885      18.94+/-0.24

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.018 in the direction of the burst
(Schlegel et al. 1998).
Looking for U.S. government information and services? Visit USA.gov