image overlap message for exposure 3 of trigger 1327910
uvot_overlap.pl vrs. 2010-12-20b fem started at 250625d21h44m09s176951usUT
The observation of trigger 1327910 started 2025-06-25T16:19:52.1
Examining file ./1327910_g895_uvot_sky_image.fits
The exposure ID is 772561192
The exposure time is 149.868 (seconds)
The filter is WHITE.
*** Warning -- found 13725 null pixels in the image.
The uvot region is centered at (261.5149,22.2726) 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 0.506 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 at most 6.21 sq. arc min or 0.22 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 0.461 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 3 of trigger 1327910
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250625d21h44m32s958577usUT
Observation start time is 2025-06-25T16:19:52.1
Examining file ./1327910_g895_uvot_catalog_image.fits
The exposure ID is 772561192
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 9 detected source(s) for 1327910_g895
Aspect correction adds -0.00014 degrees (-0.033 sec of time = -0.45 arc sec) to RA
Aspect correction adds 0.00152 degrees ( 5.48 arcsec) to Dec
Total aspect correction is 5.50 arcsec
Star catalogs centered at 261.5104 , 22.2682 with radius 2.12 arc min.
n_usno: 84 n_gsc: 83
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 8 matched entries is 0.516" for 1327910_g895
Mean and std. dev of mag. difference (MAG_DELTA) are 0.803 and 0.494 for 1327910_g895
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1327910_g895.
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 7 in the list of sources is a candidate afterglow for 1327910_g895 with genie
ra=261.49321 (17:25:58.37) dec=22.27245 (+22:16:20.8) +/- 0.6" mag=16.57+/-0.14
dist=55.4 REFID=1 major=5.3 minor=1.7 flag=18 (blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 90.0 arc sec from the BAT position.
This source is near the edge of image (0.885)
Found 7 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 8.7 -1 USNO-B1 20.37 19.20 19.72
261.4914 22.2741 8.4 -1 USNO-B1 20.07 19.23 19.60
261.4886 22.2731 15.4 -1 USNO-B1 12.54 11.80 12.13 *
261.4959 22.2718 9.3 -1 GSC2.3 19.22 20.36 19.42
261.4916 22.2742 8.3 -1 GSC2.3 99.99 99.99 99.99
261.4886 22.2731 15.4 -1 GSC2.3 99.99 99.99 12.18
261.4890 22.2746 15.9 -1 GSC2.3 99.99 99.99 99.99
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 9 in the list of sources is a candidate afterglow for 1327910_g895 with genie
ra=261.49073 (17:25:57.78) dec=22.26959 (+22:16:10.5) +/- 0.6" mag=18.82+/-0.15
dist=61.0 REFID=7 major=3.2 minor=1.1 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 95.6 arc sec from the BAT position.
This source is near the edge of image (0.959)
Found 9 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 18.7 -1 USNO-B1 20.37 19.20 19.72
261.4933 22.2657 16.3 -1 USNO-B1 99.99 19.88 99.99
261.4914 22.2741 16.3 -1 USNO-B1 20.07 19.23 19.60
261.4886 22.2731 14.4 -1 USNO-B1 12.54 11.80 12.13 *
261.4959 22.2718 19.0 -1 GSC2.3 19.22 20.36 19.42
261.4942 22.2655 18.6 -1 GSC2.3 99.99 99.99 99.99
261.4916 22.2742 17.0 -1 GSC2.3 99.99 99.99 99.99
261.4886 22.2731 14.4 -1 GSC2.3 99.99 99.99 12.18
261.4890 22.2746 18.8 -1 GSC2.3 99.99 99.99 99.99
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 13454.903 counts in the bkg source region of 2145.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 6.273 counts/pixel (5-sig UL in 4" is 20.35 mag) for 1327910_g895
There are 1115.1669 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 5.548 counts/pixel for 1327910_g895
There are 4379.0776 counts in the xrt_bkg source region of 707.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 6.194 counts/pixel (5-sig UL in 4" is 20.36 mag) for 1327910_g895
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 20.91, 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_772561192_250625d21h44m32s958577usUT_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(261.5149,22.2726,45")
fk5;-circle(261.508365553119,22.2619802621699,6")
fk5;-circle(261.506811432451,22.2745679991856,6")
fk5;-circle(261.504316659769,22.2748991541972,6")
fk5;-circle(261.507769697751,22.2803506741972,6")
fk5;-circle(261.511843946946,22.283102736661,6")
Region file: 1327910_772561192_250625d21h44m32s958577usUT_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_772561192_250625d21h44m32s958577usUT_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(261.508365553119,22.2619802621699,6")
fk5;-circle(261.506811432451,22.2745679991856,6")
image paragraph message for exposure 3 of trigger 1327910
SRCLIST PROBLEM: srclist filled telemetry buffer
------ 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 859 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 250625d21h44m36s528043usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1327910
-expid=772561192 -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 772561192.1194 or about 2025:177:16:19:47 UT
Found 1311 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 12% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 4 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 9 source(s) in Genie image catalog. Found 2 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.91 mag. Found 83 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 12% of the
Genie image region. The Genie image is INCOMPLETE with 13725 null pixels.
Genie image analysis:
Found 13454.9 counts in the large background region of 2145.0 pixels or a rate
of 6.273 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 20.18 mag. for a
4-arcsec aperture.
Found 1115.2 counts in the XRT position region of 201.0 pixels or a rate of
5.548 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.865 +/- 0.256 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.767 cps or 19.89 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 19.69
mag. The closest srclist source has ra= 261.5082 dec= 22.2620 mag=18.30
sep=19.12". The closest Genie source has ra= 261.5084 dec= 22.2620 mag=17.85
sep=19.26".
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?
772561192 859 WHITE srclist found no candidates.
772561192 859 WHITE image found no candidates.
List afterglow candidates for other finding charts.
772560456 123 WHITE srclist found no candidates.
772560456 123 WHITE image found no candidates.
772560615 282 U srclist found no candidates.
772560615 282 U 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: 16:19:47
MAGNITUDE: 19.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT