image overlap message for exposure 2 of trigger 1400467
uvot_overlap.pl vrs. 2010-12-20b fem started at 251001d18h12m20s362199usUT
The observation of trigger 1400467 started 2025-10-01T14:32:17.5
Examining file ./1400467_g896_uvot_sky_image.fits
The exposure ID is 781021937
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (42.6712,-23.0240) with a roll angle of 123.5
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 (42.6650,-23.0200) with a radius of 3.000 arc min
This is 0.421 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 (42.6509,-23.0205) with a radius of 0.035 arc min
This is 1.145 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
image afterglow message for exposure 2 of trigger 1400467
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251001d18h12m28s233386usUT
Observation start time is 2025-10-01T14:32:17.5
Examining file ./1400467_g896_uvot_catalog_image.fits
The exposure ID is 781021937
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 10 detected source(s) for 1400467_g896
Aspect correction adds -0.00032 degrees (-0.076 sec of time = -1.05 arc sec) to RA
Aspect correction adds -0.00174 degrees (-6.25 arcsec) to Dec
Total aspect correction is 6.34 arcsec
Star catalogs centered at 42.6774 , -23.0243 with radius 2.33 arc min.
n_usno: 65 n_gsc: 85
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 7.55098
RA DEC Mag Color
bright star 0: 42.70897 (02:50:50.15) -23.02755 (-23:01:39.2) 7.55 USNO-V
Mean distance difference (CAT_DELTA) for 2 matched entries is 0.162" for 1400467_g896
Mean and std. dev of mag. difference (MAG_DELTA) are 0.933 and 0.200 for 1400467_g896
Found 8 entries without IDs and 5 entries that are acceptable afterglow candidates for 1400467_g896.
Acceptable entries have no ID, XRT distances < 5.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
3 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=42.6650 (02:50:39.60) DEC=-23.0200 (-23:01:12.0)
XRT distances are from RA=42.6509 (02:50:36.21) DEC=-23.0205 (-23:01:13.7)
*** WARNING 80 per cent of entries have no IDs.
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1400467_g896 with genie
ra=42.68736 (02:50:44.97) dec=-23.01918 (-23:01:09.0) +/- 0.8" mag=18.65+/-0.15
dist=121.0 REFID=4 major=7.2 minor=6.6 flag=1 (neighbor)
*** The position of this source is inconsistent with the XRT position.
The position is 74.2 arc sec from the BAT position.
Found 5 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
42.6855 -23.0212 9.6 -1 USNO-B1 20.18 19.10 19.58
42.6870 -23.0212 7.4 -1 USNO-B1 18.45 19.52 19.04
42.6851 -23.0210 9.9 -1 GSC2.3 19.83 99.99 99.99
42.6862 -23.0215 9.3 -1 GSC2.3 20.28 20.90 99.99
42.6896 -23.0210 10.0 -1 GSC2.3 99.99 22.46 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 7.2
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1400467_g896 with genie
ra=42.68805 (02:50:45.13) dec=-23.02991 (-23:01:47.7) +/- 1.1" mag=20.59+/-0.29
dist=127.8 REFID=7 major=2.1 minor=1.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 84.3 arc sec from the BAT position.
Found 14 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
42.6842 -23.0272 16.1 -1 USNO-B1 19.08 19.41 19.26
42.6860 -23.0273 11.7 -1 USNO-B1 19.03 19.54 19.31
42.6877 -23.0257 15.2 -1 USNO-B1 19.02 19.04 19.03
42.6879 -23.0273 9.5 -1 USNO-B1 18.44 19.22 18.87
42.6894 -23.0270 11.4 -1 USNO-B1 19.33 19.46 19.40
42.6906 -23.0272 12.9 -1 USNO-B1 18.55 18.20 18.36
42.6922 -23.0272 16.8 -1 USNO-B1 18.26 19.36 18.87
42.6931 -23.0275 18.8 -1 USNO-B1 99.99 18.45 99.99
42.6935 -23.0276 19.9 -1 USNO-B1 99.99 18.49 99.99
42.6874 -23.0272 9.9 -1 GSC2.3 17.95 99.99 99.99
42.6866 -23.0316 7.6 -1 GSC2.3 99.99 21.89 99.99
42.6905 -23.0272 12.7 -1 GSC2.3 99.99 99.99 99.99
42.6911 -23.0319 12.3 -1 GSC2.3 99.99 22.43 99.99
42.6915 -23.0335 17.2 -1 GSC2.3 99.99 22.03 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.1
-----------------
Entry 4 in the list of sources is a candidate afterglow for 1400467_g896 with genie
ra=42.68361 (02:50:44.07) dec=-23.03739 (-23:02:14.6) +/- 0.8" mag=18.07+/-0.15
dist=124.4 REFID=2 major=7.2 minor=4.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 87.9 arc sec from the BAT position.
Found 1 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
42.6888 -23.0365 17.5 -1 GSC2.3 99.99 20.33 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 7.2
-----------------
Entry 5 in the list of sources is a candidate afterglow for 1400467_g896 with genie
ra=42.69428 (02:50:46.63) dec=-23.01802 (-23:01:04.9) +/- 0.8" mag=19.60+/-0.18
dist=144.1 REFID=3 major=1.7 minor=1.4 flag=2 (blended)
*** The position of this source is inconsistent with the XRT position.
The position is 97.3 arc sec from the BAT position.
This source is near the edge of image (0.927)
Found 2 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
42.6896 -23.0210 18.8 -1 GSC2.3 99.99 22.46 99.99
42.6941 -23.0230 18.1 -1 GSC2.3 99.99 21.95 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 1.7
-----------------
Entry 6 in the list of sources is a candidate afterglow for 1400467_g896 with genie
ra=42.69134 (02:50:45.92) dec=-23.03576 (-23:02:08.7) +/- 0.8" mag=18.37+/-0.15
dist=144.9 REFID=10 major=3.9 minor=3.4 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 104.1 arc sec from the BAT position.
This source is near the edge of image (0.865)
Found 6 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
42.6911 -23.0319 14.0 -1 GSC2.3 99.99 22.43 99.99
42.6915 -23.0335 8.3 -1 GSC2.3 99.99 22.03 99.99
42.6888 -23.0365 8.8 -1 GSC2.3 99.99 20.33 99.99
42.6964 -23.0329 19.6 -1 GSC2.3 20.32 99.99 99.99
42.6911 -23.0396 14.0 -1 GSC2.3 99.99 22.30 99.99
42.6950 -23.0368 12.6 -1 GSC2.3 99.99 22.45 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 3.9
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 1.1161401E+05 counts in the bkg source region of 6196.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 18.014 counts/pixel (5-sig UL in 4" is 19.78 mag) for 1400467_g896
There are 3572.8103 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 17.775 counts/pixel for 1400467_g896
XRT source is too far (68.5462127521762") from center -- do not compute local background.
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 20.33, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1400467_781021937_251001d18h12m28s233386usUT_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(42.6712,-23.0240,45")
fk5;-circle(42.6792691060196,-23.0169233573196,6")
fk5;-circle(42.6641358939841,-23.036446242539,6")
Region file: 1400467_781021937_251001d18h12m28s233386usUT_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(42.65087,-23.02047,8")
image paragraph message for exposure 2 of trigger 1400467
------ Start for Possible Stand-alone Circular ----
In response to GRB251001 (Swift/BAT trigger 1400467) at 14:17:20 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 860 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 19.6 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 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.023.
------- notes for trigger 1400467 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251001d18h12m33s048097usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1400467
-expid=781021937 -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/1400467/
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 781021937.52238 or about 2025:275:14:32:12 UT
Found 375 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 169 sources in
srclist catalog. Found 142 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 10 source(s) in Genie image catalog. Found 8 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.33 mag. Found 85 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
10% of the Genie image region.
Genie image analysis:
Found 111614.0 counts in the large background region of 6196.0 pixels or a rate
of 18.014 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 19.61 mag. for a
4-arcsec aperture.
Found 3572.8 counts in the XRT position region of 201.0 pixels or a rate of
17.775 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.320 +/- 0.405 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.215 cps or 19.39 mag. The closest srclist
source has ra= 42.6343 dec= -23.0217 mag=15.85 sep=55.06". The closest Genie
source has ra= 42.6641 dec= -23.0364 mag=16.64 sep=72.38".
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?
781021937 860 WHITE srclist found no candidates.
781021937 860 WHITE image found no candidates.
List afterglow candidates for other finding charts.
781021195 118 ? srclist data are not available.
781021195 118 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -23.02047
GRB_ERROR: 5.25
GRB_RA: 42.65087
IMAGE_START_TIME: 14:32:12
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT