srclist overlap message for exposure 2 of trigger 1406589
uvot_overlap.pl vrs. 2010-12-20b fem started at 251024d21h39m36s869071usUT
The observation of trigger 1406589 started 2025-10-24T17:52:29.4
Examining file ./1406589_g326_uvot_sky_srclist.fits
The exposure ID is 783021149
The exposure time is undefined.
The filter is U.
The uvot region is centered at (306.6038,-68.5761) with a roll angle of 258.9
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (306.6220,-68.5740) with a radius of 3.000 arc min
This is 0.419 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 28.27 sq. arc min or 1.00 of the BAT error circle
The XRT error circle is centered at (306.5978,-68.5724) with a radius of 0.037 arc min
This is 0.257 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1406589
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251024d21h39m50s611057usUT
Observation start time is 2025-10-24T17:52:29.4
Examining file ./1406589_g326_uvot_catalog_srclist.fits
The exposure ID is 783021149
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 157 detected source(s) for 1406589_g326
Aspect correction adds -0.00388 degrees (-0.930 sec of time = -5.10 arc sec) to RA
Aspect correction adds -0.00034 degrees (-1.23 arcsec) to Dec
Total aspect correction is 5.24 arcsec
Star catalogs centered at 306.6223 , -68.5866 with radius 9.28 arc min.
n_usno: 1741 n_gsc: 1321
*** WARNING -- bright star catalog has 6 entries brighter than 12 mag
The brightest has mag 9.6566
RA DEC Mag Color
bright star 0: 306.59707 (20:26:23.30) -68.65662 (-68:39:23.8) 9.66 USNO-V
bright star 1: 306.81579 (20:27:15.79) -68.55804 (-68:33:29.0) 11.41 USNO-V
bright star 2: 306.92243 (20:27:41.38) -68.60359 (-68:36:12.9) 10.14 USNO-V
bright star 3: 306.92074 (20:27:40.98) -68.55736 (-68:33:26.5) 10.98 USNO-V
bright star 4: 306.54016 (20:26:09.64) -68.69648 (-68:41:47.3) 11.70 USNO-V
bright star 5: 306.25415 (20:25:01.00) -68.65202 (-68:39:07.3) 11.57 GSC-F
Mean distance difference (CAT_DELTA) for 95 matched entries is 0.951" for 1406589_g326
Mean and std. dev of mag. difference (MAG_DELTA) are 1.549 and 0.833 for 1406589_g326
Found 66 entries without IDs and 3 entries that are acceptable afterglow candidates for 1406589_g326.
Acceptable entries have no ID, XRT distances < 5.5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
52 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=306.6220 (20:26:29.28) DEC=-68.5740 (-68:34:26.4)
XRT distances are from RA=306.5978 (20:26:23.48) DEC=-68.5724 (-68:34:20.6)
*** WARNING 42 per cent of entries have no IDs.
-----------------
Entry 5 in the list of sources is a candidate afterglow for 1406589_g326 with 1x1 stamp
ra=306.62407 (20:26:29.78) dec=-68.54516 (-68:32:42.6) +/- 1.1" mag=18.65+/-0.35
dist=103.9 REFID=141
*** The position of this source is inconsistent with the XRT position.
The position is 103.9 arc sec from the BAT position.
src: 5 distr. of nearby unmatched sources: 0 0 0 0 0
Found 14 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
306.6227 -68.5487 12.7 -1 USNO-B1 20.82 19.03 19.82
306.6172 -68.5483 14.7 -1 USNO-B1 20.57 19.40 19.92
306.6175 -68.5477 12.5 -1 USNO-B1 20.45 19.44 19.89
306.6369 -68.5478 19.5 -1 USNO-B1 21.34 19.55 20.34
306.6224 -68.5464 4.8 -1 USNO-B1 13.72 12.87 13.24 *
306.6298 -68.5464 8.9 -1 USNO-B1 20.55 19.91 20.19
306.6167 -68.5462 10.5 -1 USNO-B1 99.99 19.37 99.99
306.6153 -68.5443 12.0 -1 USNO-B1 20.06 18.95 19.44
306.6174 -68.5482 14.2 -1 GSC2.3 20.39 22.17 99.99
306.6367 -68.5479 19.3 -1 GSC2.3 20.10 22.65 99.99
306.6224 -68.5464 4.8 -1 GSC2.3 12.67 13.71 99.99 *
306.6151 -68.5443 12.2 -1 GSC2.3 99.99 20.64 99.99
306.6149 -68.5442 12.5 -1 GSC2.3 18.80 20.78 99.99
306.6262 -68.5407 16.3 -1 GSC2.3 99.99 22.51 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 15 in the list of sources is a candidate afterglow for 1406589_g326 with 1x1 stamp
ra=306.60344 (20:26:24.83) dec=-68.61364 (-68:36:49.1) +/- 1.1" mag=18.65+/-0.35
dist=148.7 REFID=138
*** The position of this source is inconsistent with the XRT position.
The position is 144.8 arc sec from the BAT position.
src: 15 srclist_match has ID
src: 15 distr. of nearby unmatched sources: 0 0 0 0 0
Found 4 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
306.5988 -68.6092 17.1 -1 USNO-B1 21.29 19.88 20.50
306.6026 -68.6139 1.3 -1 USNO-B1 18.50 18.42 18.46 *
306.5986 -68.6093 16.8 -1 GSC2.3 19.54 22.55 99.99
306.6028 -68.6139 1.2 -1 GSC2.3 18.19 19.05 99.99 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 18 in the list of sources is a candidate afterglow for 1406589_g326 with 3x3 stamp
ra=306.50138 (20:26:00.33) dec=-68.57728 (-68:34:38.2) +/- 1.1" mag=17.45+/-0.35
dist=128.0 REFID=30
*** The position of this source is inconsistent with the XRT position.
The position is 159.1 arc sec from the BAT position.
src: 18 srclist_match has ID
src: 18 distr. of nearby unmatched sources: 1 0 0 0 0
Found 5 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
306.5049 -68.5823 18.7 -1 USNO-B1 18.16 16.48 17.22
306.5005 -68.5774 1.2 -1 USNO-B1 16.41 15.77 16.06 *
306.5124 -68.5757 15.5 -1 GSC2.3 99.99 22.24 99.99
306.5049 -68.5823 18.6 -1 GSC2.3 16.48 18.73 99.99
306.5007 -68.5774 1.0 -1 GSC2.3 15.71 16.77 99.99 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
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 18.12, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 1406589
------ Start for Possible Stand-alone Circular ----
In response to GRB251024 (Swift/BAT trigger 1406589) at 17:47:02 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 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
0.044.
------- notes for trigger 1406589 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251024d21h39m53s937140usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1406589
-expid=783021149 -meonly -msg_srclist
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/1406589/
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 783021149.35608 or about 2025:298:17:52:24 UT
Found 1737 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 14% of the srclist region. Found 157 sources in
srclist catalog. Found 66 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 3 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 20.65 mag. Found 110 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 17% of the
Genie image region. The Genie image is INCOMPLETE with 9013 null pixels.
Genie image analysis:
Found 10177.5 counts in the large background region of 5106.0 pixels or a rate
of 1.993 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 19.88 mag. for a
4-arcsec aperture.
Found 404.3 counts in the XRT position region of 197.0 pixels or a rate of
2.052 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.059 +/- 0.089 (1-sigma) cps or
21.21 mag and a range from 20.21 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.325 cps or 19.35 mag. The closest srclist source has ra= 306.6220
dec= -68.5815 mag=18.44 sep=45.75". The closest Genie source has ra= 306.6226
dec= -68.5816 mag=17.66 sep=46.61".
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?
783021149 290 U srclist found no candidates.
783021149 290 U image found no candidates.
List afterglow candidates for other finding charts.
783020991 132 WHITE srclist found no candidates.
783020991 132 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -68.57239
GRB_ERROR: 5.5
GRB_RA: 306.59783
IMAGE_START_TIME: 17:52:24
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT