image overlap message for exposure 1 of trigger 1327910
uvot_overlap.pl vrs. 2010-12-20b fem started at 250625d21h44m07s855726usUT
The observation of trigger 1327910 started 2025-06-25T16:07:36.7
Examining file ./1327910_g159_uvot_sky_image.fits
The exposure ID is 772560456
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (261.5158,22.2720) with a roll angle of 343.4
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 (261.5190,22.2650) with a radius of 3.000 arc min
This is 0.455 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 (261.5089,22.2673) with a radius of 0.038 arc min
This is 0.479 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 1 of trigger 1327910
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250625d21h44m11s624474usUT
Observation start time is 2025-06-25T16:07:36.7
Examining file ./1327910_g159_uvot_catalog_image.fits
The exposure ID is 772560456
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 24 detected source(s) for 1327910_g159
Aspect correction adds -0.00061 degrees (-0.147 sec of time = -2.04 arc sec) to RA
Aspect correction adds 0.00110 degrees ( 3.97 arcsec) to Dec
Total aspect correction is 4.47 arcsec
Star catalogs centered at 261.5150 , 22.2690 with radius 2.54 arc min.
n_usno: 120 n_gsc: 122
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 22 matched entries is 0.390" for 1327910_g159
Mean and std. dev of mag. difference (MAG_DELTA) are 0.817 and 0.381 for 1327910_g159
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 1327910_g159.
Acceptable entries have no ID, XRT distances < 5.75", 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=261.5190 (17:26:04.56) DEC=22.2650 (+22:15:54.0)
XRT distances are from RA=261.5089 (17:26:02.13) DEC=22.2673 (+22:16:02.3)
-----------------
Entry 20 in the list of sources is a candidate afterglow for 1327910_g159 with genie
ra=261.49154 (17:25:57.97) dec=22.27020 (+22:16:12.7) +/- 0.6" mag=17.91+/-0.14
dist=58.7 REFID=11 major=7.0 minor=2.3 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 93.4 arc sec from the BAT position.
This source is near the edge of image (0.973)
Found 9 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
261.4958 22.2719 15.3 -1 USNO-B1 20.37 19.20 19.72
261.4933 22.2657 17.1 -1 USNO-B1 99.99 19.88 99.99
261.4914 22.2741 14.0 -1 USNO-B1 20.07 19.23 19.60
261.4886 22.2731 14.2 -1 USNO-B1 12.54 11.80 12.13 *
261.4959 22.2718 15.7 -1 GSC2.3 19.22 20.36 19.42
261.4942 22.2655 19.0 -1 GSC2.3 99.99 99.99 99.99
261.4916 22.2742 14.5 -1 GSC2.3 99.99 99.99 99.99
261.4890 22.2746 17.8 -1 GSC2.3 99.99 99.99 99.99
261.4886 22.2731 14.2 -1 GSC2.3 99.99 99.99 12.18
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
-----------------
Entry 21 in the list of sources is a candidate afterglow for 1327910_g159 with genie
ra=261.49205 (17:25:58.09) dec=22.27233 (+22:16:20.4) +/- 0.6" mag=18.35+/-0.15
dist=58.9 REFID=10 major=4.9 minor=1.8 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 93.6 arc sec from the BAT position.
This source is near the edge of image (0.973)
Found 7 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
261.4958 22.2719 12.5 -1 USNO-B1 20.37 19.20 19.72
261.4914 22.2741 6.6 -1 USNO-B1 20.07 19.23 19.60
261.4886 22.2731 11.7 -1 USNO-B1 12.54 11.80 12.13 *
261.4959 22.2718 13.0 -1 GSC2.3 19.22 20.36 19.42
261.4916 22.2742 6.9 -1 GSC2.3 99.99 99.99 99.99
261.4890 22.2746 12.9 -1 GSC2.3 99.99 99.99 99.99
261.4886 22.2731 11.7 -1 GSC2.3 99.99 99.99 12.18
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
-----------------
Entry 23 in the list of sources is a candidate afterglow for 1327910_g159 with genie
ra=261.49252 (17:25:58.20) dec=22.27499 (+22:16:30.0) +/- 0.6" mag=18.05+/-0.14
dist=61.1 REFID=15 major=3.6 minor=2.6 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 95.3 arc sec from the BAT position.
This source is near the edge of image (0.978)
Found 7 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
261.4958 22.2719 15.5 -1 USNO-B1 20.37 19.20 19.72
261.4914 22.2741 4.9 -1 USNO-B1 20.07 19.23 19.60 *
261.4886 22.2731 14.6 -1 USNO-B1 12.54 11.80 12.13 *
261.4959 22.2718 16.0 -1 GSC2.3 19.22 20.36 19.42
261.4916 22.2742 4.0 -1 GSC2.3 99.99 99.99 99.99 *
261.4890 22.2746 11.7 -1 GSC2.3 99.99 99.99 99.99
261.4886 22.2731 14.6 -1 GSC2.3 99.99 99.99 12.18
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 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 34086.512 counts in the bkg source region of 5368.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 6.350 counts/pixel (5-sig UL in 4" is 20.35 mag) for 1327910_g159
There are 1253.0266 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 6.297 counts/pixel for 1327910_g159
There are 5707.6694 counts in the xrt_bkg source region of 906.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 6.300 counts/pixel (5-sig UL in 4" is 20.35 mag) for 1327910_g159
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 20.90, XRT distances < 5.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1327910_772560456_250625d21h44m11s624474usUT_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(261.5158,22.2720,45")
fk5;-circle(261.515034605512,22.265358450014,6")
fk5;-circle(261.51458176065,22.261333893486,6")
fk5;-circle(261.508311377974,22.2619801810676,6")
fk5;-circle(261.515824750659,22.2763846690518,6")
fk5;-circle(261.526685388514,22.2748983508739,6")
fk5;-circle(261.506775484678,22.2746191906262,6")
fk5;-circle(261.502928588318,22.2661375310427,6")
fk5;-circle(261.515649938694,22.2806443025761,6")
fk5;-circle(261.504213939643,22.27488680422,6")
fk5;-circle(261.511768619699,22.2831152088187,6")
Region file: 1327910_772560456_250625d21h44m11s624474usUT_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(261.50887,22.26731,8")
Region file: 1327910_772560456_250625d21h44m11s624474usUT_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(261.50887,22.26731,25")
fk5;-circle(261.50887,22.26731,15")
fk5;-circle(261.515034605512,22.265358450014,6")
fk5;-circle(261.51458176065,22.261333893486,6")
fk5;-circle(261.508311377974,22.2619801810676,6")
fk5;-circle(261.506775484678,22.2746191906262,6")
fk5;-circle(261.502928588318,22.2661375310427,6")
image paragraph message for exposure 1 of trigger 1327910
------ Start for Possible Stand-alone Circular ----
In response to GRB250625 (Swift/BAT trigger 1327910) at 16:04:56 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 124 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
0.054.
------- notes for trigger 1327910 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250625d21h44m17s266012usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1327910
-expid=772560456 -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/1327910/
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 772560456.69814 or about 2025:177:16:07:31 UT
Found 707 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 12% of the srclist region. Found 121 sources in
srclist catalog. Found 7 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 24 source(s) in Genie image catalog. Found 3 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.90 mag. Found 121 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
13% of the Genie image region.
Genie image analysis:
Found 34086.5 counts in the large background region of 5368.0 pixels or a rate
of 6.350 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 20.17 mag. for a
4-arcsec aperture.
Found 1253.0 counts in the XRT position region of 199.0 pixels or a rate of
6.296 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.005 +/- 0.261 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.782 cps or 19.87 mag. The closest srclist
source has ra= 261.5082 dec= 22.2621 mag=18.23 sep=18.92". The closest Genie
source has ra= 261.5083 dec= 22.2620 mag=17.78 sep=19.28".
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?
772560456 123 WHITE srclist found no candidates.
772560456 123 WHITE image found no candidates.
List afterglow candidates for other finding charts.
772560615 282 U srclist found no candidates.
772560615 282 U image found no candidates.
772561192 859 WHITE srclist found no candidates.
772561192 859 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 22.26731
GRB_ERROR: 5.75
GRB_RA: 261.50887
IMAGE_START_TIME: 16:07:31
MAGNITUDE: 19.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT