image overlap message for exposure 2 of trigger 1400964
uvot_overlap.pl vrs. 2010-12-20b fem started at 251003d11h33m09s295800usUT
The observation of trigger 1400964 started 2025-10-03T02:03:57.4
Examining file ./1400964_g326_uvot_sky_image.fits
The exposure ID is 781149837
The exposure time is 183.109 (seconds)
The filter is U.
The uvot region is centered at (18.5307,56.4975) with a roll angle of 11.5
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 (18.5030,56.5070) with a radius of 3.000 arc min
This is 1.081 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 (18.5293,56.4908) with a radius of 0.042 arc min
This is 0.403 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 1400964
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251003d11h33m25s012605usUT
Observation start time is 2025-10-03T02:03:57.4
Examining file ./1400964_g326_uvot_catalog_image.fits
The exposure ID is 781149837
The exposure is 183.109 sec.
The bin size is 2 pixels
The filter is U
There are 23 detected source(s) for 1400964_g326
Aspect correction adds 0.00198 degrees (0.476 sec of time = 3.94 arc sec) to RA
Aspect correction adds 0.00125 degrees ( 4.48 arcsec) to Dec
Total aspect correction is 5.97 arcsec
Star catalogs centered at 18.5264 , 56.4956 with radius 2.71 arc min.
n_usno: 251 n_gsc: 262
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.6325
RA DEC Mag Color
bright star 0: 18.50173 (01:14:00.41) 56.52271 (+56:31:21.8) 11.63 USNO-V
Mean distance difference (CAT_DELTA) for 24 matched entries is 0.626" for 1400964_g326
Mean and std. dev of mag. difference (MAG_DELTA) are 1.509 and 0.777 for 1400964_g326
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1400964_g326.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=18.5030 (01:14:00.72) DEC=56.5070 (+56:30:25.2)
XRT distances are from RA=18.5293 (01:14:07.02) DEC=56.4908 (+56:29:26.9)
Found 3 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
18.5258 56.4901 7.4 -1 USNO-B1 20.44 19.11 19.70
18.5309 56.4932 9.2 -1 GSC2.3 20.02 99.99 99.99
18.5259 56.4900 7.3 -1 GSC2.3 19.56 21.10 99.99
The closest star is 7.35" away.
List UVOT sources within 10" of the XRT position:
There are 10867.452 counts in the bkg source region of 6080.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.787 counts/pixel (5-sig UL in 4" is 19.81 mag) for 1400964_g326
There are 336.52130 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 1.700 counts/pixel for 1400964_g326
There are 2144.7927 counts in the xrt_bkg source region of 1242.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 1.727 counts/pixel (5-sig UL in 4" is 19.83 mag) for 1400964_g326
There are no candidates inside BAT error circle, but outside XRT error circle.
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.37, 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: 1400964_781149837_251003d11h33m25s012605usUT_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(18.5307,56.4975,45")
fk5;-circle(18.5327718017251,56.5012323517096,6")
fk5;-circle(18.5420102560903,56.5034242479142,6")
Region file: 1400964_781149837_251003d11h33m25s012605usUT_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(18.52925,56.49081,8")
Region file: 1400964_781149837_251003d11h33m25s012605usUT_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(18.52925,56.49081,25")
fk5;-circle(18.52925,56.49081,15")
image paragraph message for exposure 2 of trigger 1400964
------ Start for Possible Stand-alone Circular ----
In response to GRB251003 (Swift/BAT trigger 1400964) at 01:58:30 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 183 seconds with the U filter starting
290 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 the expected extinction corresponding to E(B-V) of
0.408.
------- notes for trigger 1400964 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251003d11h33m30s840632usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1400964
-expid=781149837 -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/1400964/
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 781149837.40892 or about 2025:277:02:03:52 UT
Found 1441 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 24% of the srclist region. Found 128 sources in
srclist catalog. Found 41 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.95 mag.
Found 23 source(s) in Genie image catalog. Found 0 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.37 mag. Found 256 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
24% of the Genie image region.
Genie image analysis:
Found 10867.5 counts in the large background region of 6080.0 pixels or a rate
of 1.787 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 19.60 mag. for a
4-arcsec aperture.
Found 336.5 counts in the XRT position region of 198.0 pixels or a rate of
1.699 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.030 +/- 0.108 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.324 cps or 19.36 mag. The closest srclist
source has ra= 18.5116 dec= 56.4802 mag=18.87 sep=51.77". The closest Genie
source has ra= 18.5328 dec= 56.5012 mag=20.66 sep=38.17".
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?
781149837 290 U srclist found no candidates.
781149837 290 U image found no candidates.
List afterglow candidates for other finding charts.
781149625 78 WHITE srclist found no candidates.
781149625 78 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 56.49081
GRB_ERROR: 6.25
GRB_RA: 18.52925
IMAGE_START_TIME: 02:03:52
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT