| GRBlog | |
Blog for Gamma Ray Bursts |
|
|
Search matched 1 messages (refine search)
Displaying messages 1 to 1 This message was parsed by an automated script.
![]() TITLE: GCN CIRCULAR NUMBER: 13386 SUBJECT: Swift detection of IGR J17062-6143 DATE: 12/06/25 23:03:17 GMT FROM: Scott Barthelmy at NASA/GSFC <scott@milkyway.gsfc.nasa.gov> S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), J. A. Kennea (PSU), A. Melandri (INAF-OAB), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU), and C. A. Swenson (PSU) report on behalf of the Swift Team: At 22:42:31 UT, the Swift Burst Alert Telescope (BAT) triggered and
located IGR J17062-6143 (trigger=525148). Swift slewed immediately to the source.
The BAT on-board calculated location is
RA, Dec 256.609, -61.728 which is
RA(J2000) = 17h 06m 26s
Dec(J2000) = -61d 43' 40"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). As is typical with image triggers (duration = 64 sec),
the real-time lightcurve does not show anything significant.
The XRT began observing the field at 22:45:05.2 UT, 153.6 seconds after
the BAT trigger. XRT found a bright X-ray source located
at RA, Dec 256.5681, -61.7098 which is equivalent to:
RA(J2000) = +17h 06m 16.34s
Dec(J2000) = -61d 42' 35.3"
with an uncertainty of 5.7 arcseconds (radius, 90% containment). This
location is 95 arcseconds from the BAT onboard position, within the BAT
error circle. No event data are yet available to determine the column
density using X-ray spectroscopy.
The initial flux in the 0.1 s image was 2.25e-08 erg cm^-2 s^-1 (0.2-10
keV).
UVOT took a finding chart exposure of 250 seconds with the U filter starting
321 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 17:06:16.27 = 256.56779
DEC(J2000) = -61:42:40.0 = -61.71112
with a 90%-confidence error radius of about 0.61 arc sec. This position is 4.8
arc sec. from the center of the XRT error circle. The estimated magnitude is
15.84 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.15.
IGR J17062-6143 is a known X-ray transient with a location of
RA=256.56771, DEC=-61.71125 (RA=17 06 16.3, DEC=-61 42 40.5)
with an uncertainty of 0.3 arc sec (ATEL #1840; Ricci et al.),
consistent with this detection.
The nature of this transient is unknown and further observation
are warranted. Cited by 1 message
This site was created by Robert Quimby
Database maintained by Robert Quimby, Erin McMahon, and Jeremy Murphy Information displayed on this site is compiled from GCN Circulars and other sources as indicated. |
|