image overlap message for exposure 2 of trigger 1519536
uvot_overlap.pl vrs. 2010-12-20b fem started at 261018d01h21m03s766683usUT
The observation of trigger 1519536 started 2026-10-17T16:10:45.8
Examining file ./1519536_g339_uvot_sky_image.fits
The exposure ID is 813946245
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (139.9102,12.6370) with a roll angle of 106.5
It is square with sides of 2.68 arc min. for an area of 7.17 sq arc min
The BAT error circle is centered at (139.9000,12.6440) with a radius of 3.000 arc min
This is 0.731 arc min from the center of the uvot region
The area of the BAT error circle is 28.27 sq. arc min
The UVOT/BAT overlap is 7.17 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (139.9035,12.6378) with a radius of 0.042 arc min
This is 0.398 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1519536
find_uvot_ag.pl vrs. 2023-04-25a fem started at 261018d01h21m19s083037usUT
Observation start time is 2026-10-17T16:10:45.8
Examining file ./1519536_g339_uvot_catalog_image.fits
The exposure ID is 813946245
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 4 detected source(s) for 1519536_g339
Aspect correction adds 0.00212 degrees (0.508 sec of time = 7.44 arc sec) to RA
Aspect correction adds -0.00244 degrees (-8.79 arcsec) to Dec
Total aspect correction is 11.52 arcsec
Star catalogs centered at 139.9002 , 12.6307 with radius 2.52 arc min.
n_usno: 48 n_gsc: 38
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 3 matched entries is 0.670" for 1519536_g339
Mean and std. dev of mag. difference (MAG_DELTA) are 0.866 and 0.693 for 1519536_g339
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1519536_g339.
Acceptable entries have no ID, XRT distances < 6.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
Magnitude criteria will be applied later.
BAT distances are from RA=139.9000 (09:19:36.00) DEC=12.6440 (+12:38:38.4)
XRT distances are from RA=139.9035 (09:19:36.83) DEC=12.6378 (+12:38:16.0)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1519536_g339 with genie
ra=139.91072 (09:19:38.57) dec=12.64488 (+12:38:41.6) +/- 0.9" mag=19.03+/-0.22
dist=36.1 REFID=2 major=1.3 minor=1.1 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 37.8 arc sec from the BAT position.
Found 2 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
139.9081 12.6414 15.4 -1 USNO-B1 21.60 19.87 20.64
139.9082 12.6414 15.2 -1 GSC2.3 99.99 22.25 99.99
*** If XRT position is correct, then this is NOT the afterglow
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 74060.172 counts in the bkg source region of 6204.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 11.937 counts/pixel (5-sig UL in 4" is 19.12 mag) for 1519536_g339
There are 2451.0647 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 12.317 counts/pixel for 1519536_g339
There are 14735.086 counts in the xrt_bkg source region of 1241.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 11.874 counts/pixel (5-sig UL in 4" is 19.12 mag) for 1519536_g339
There are 1 candidate(s) outside XRT error circle with mag < 19.11
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.67, XRT distances < 6.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1519536_813946245_261018d01h21m19s083037usUT_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(139.9102,12.6370,45")
fk5;-circle(139.910717397998,12.6448760762273,6")
Region file: 1519536_813946245_261018d01h21m19s083037usUT_xrt.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(139.90346,12.63778,8")
Region file: 1519536_813946245_261018d01h21m19s083037usUT_xrt_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(139.90346,12.63778,25")
fk5;-circle(139.90346,12.63778,15")
image paragraph message for exposure 2 of trigger 1519536
------ Start for Possible Stand-alone Circular ----
In response to GRB261017 (Swift/BAT trigger 1519536) at 16:05:05 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
301 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the
XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The
8'x8' region for the list of sources generated on-board covers 100% of the XRT
error circle. The list of sources is typically complete to about 18.0 mag. No
correction has been made for extinction.
------- notes for trigger 1519536 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 261018d01h21m23s468624usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1519536
-expid=813946245 -meonly -msg_image
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/1519536/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 813946245.7765 or about 2026:290:16:10:40 UT
Found 148 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 4% of the srclist region. Found 12 sources in
srclist catalog. Found 0 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 4 source(s) in Genie image catalog. Found 1 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 19.67 mag. Found 44 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 4% of the
Genie image region.
Genie image analysis:
Found 74060.2 counts in the large background region of 6204.0 pixels or a rate
of 11.937 counts/pixel in a radius of 45.0 arcsec. Based on this background,
the typical 5-sigma UL at a random point in the Genie image is 18.90 mag. for a
4-arcsec aperture.
Found 2451.1 counts in the XRT position region of 199.0 pixels or a rate of
12.317 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.353 +/- 0.213 (1-sigma) cps or
19.25 mag and a range from 18.74 to 20.25 mag. The 3-sigma UL at the XRT
position is 0.991 cps or 18.13 mag. The closest srclist source has ra= 139.8824
dec= 12.6410 mag=16.63 sep=75.08". The closest Genie source has ra= 139.9107
dec= 12.6449 mag=19.03 sep=36.09".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the image data with mag < 19.11 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=139.91072
(09:19:38.57), DEC=12.64488 (+12:38:41.6) (J2000). It has a mag of 19.03. It is
37.8" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 250 seconds with the U filter starting
301 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 09:19:38.57 = 139.91072
DEC(J2000) = +12:38:41.6 = 12.64488
with a 90%-confidence error radius of about 0.90 arc sec. The estimated
magnitude is 19.03 with a 1-sigma error of about 0.22. No correction has been
made for extinction.
All AG candidates sorted by magnitude for the current finding chart.
(U/V/White SRCLIST mags < 17.5/17.5/18.5 are reliable. Mag > 18.5/18.5/19.5 are
not. Others are uncertain.)
(U/V/White Genie image mags < 18.0/18.0/19.0 are reliable. Mag > 19.0/19.0/20.0
are not. Others are uncertain.)
(Magnitudes followed by * have been corrected for exposure.)
---MET--- -dt- filter ---RA-- ---DEC--- -MAG/Limit Dist(") Source Asp.Corr?
813946245 300 U srclist found no candidates.
813946245 300 U image found no candidates.
List afterglow candidates for other finding charts.
813946033 88 WHITE srclist found no candidates.
813946033 88 WHITE image found no candidates.
813946824 879 WHITE srclist found no candidates.
813946824 879 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 12.63778
GRB_ERROR: 6.25
GRB_RA: 139.90346
IMAGE_START_TIME: 16:10:40
MAGNITUDE: 18.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT