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 33369

Subject
GRB 230216A: Swift/UVOT Upper Limits
Date
2023-02-22T19:58:25Z (a year ago)
From
Noel Klingler at NASA-GSFC / UMBC <njk5441@psu.edu>
N. Klingler (GSFC/UMBC/CRESTII) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 230216A 106 s
after the BAT trigger (Klingler et al., GCN Circ. 33328).  No optical
afterglow consistent with the optical position
(Gendre et al. GCN Circ. 33329) is detected in the initial UVOT exposures.
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           106          256          147         >16.9
u_FC               264          514          246         >16.9
white              106         1188          353         >16.8
v                  594         1065           58         >15.9
b                  520         1164           58         >16.5
u                  264         1139          304         >16.9
w1                 643         1114           58         >17.1
m2                 618         1090           58         >17.6
w2                 569         1213           78         >17.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.198 in the direction of the burst
(Schlegel et al. 1998).
Looking for U.S. government information and services? Visit USA.gov