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

GCN Circular 11338

GRB 101011A: Swift/UVOT observations
2010-10-12T14:08:49Z (14 years ago)
Massimiliano de Pasquale at MSSL-UCL <>
M. De Pasquale (MSSL-UCL) and J. Cannizzo (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 101011A
85s after the BAT trigger (Cannizzo et al., GCN Circ. 11331).
Summing up white band exposures up to 1374s after the trigger, including
the finding chart, we find a strong indication (2.9 sigma level) of an
uncatalogued source at

���������� RA = 03h 13m 10.77s, Dec = -65d 58m 54.0s (J2000)
���������� RA = 48.29487, Dec = -65.98167 (J2000)

with an error of 1.1 arcseconds. This refined position is within 0.5
arcseconds from the XRT refined position (Evans et al., GCN Circ. 11333)
and supersedes the previous onegiven in Holland et al. (GCN Circ. 11334).
In the individual and summed UVOT exposures in other filters, no optical 
afterglow is detected.� Preliminary 3-sigma upper limits using the UVOT 
photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first 
finding chart (FC) exposure and subsequent exposures are:

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

white(FC)���������� 85��������� 235������147      >21.3
white���������������85�������  1374������373���21.7 � 0 0.4
white�������������4311���� ��  6627������393      >22
v������������������627��  � ��18725�����1375      >20.8
b������������������533�����   41918�����1055      >21.4
u������������������297�����   41737�����2865      >22.0
uw1��������������� 577������  47696�����2595      >21.7
um2��������������� 652�����   46017�����2996      >21.7
uw2��������������� 603������  17812����� 376      >21.5

The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).
Looking for U.S. government information and services? Visit