image overlap message for exposure 2 of trigger 1327910
uvot_overlap.pl vrs. 2010-12-20b fem started at 250625d21h44m08s540290usUT
The observation of trigger 1327910 started 2025-06-25T16:10:15.2
Examining file ./1327910_g318_uvot_sky_image.fits
The exposure ID is 772560615
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (261.5147,22.2714) 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 0.454 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 0.409 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 1327910
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250625d21h44m22s840259usUT
Observation start time is 2025-06-25T16:10:15.2
Examining file ./1327910_g318_uvot_catalog_image.fits
The exposure ID is 772560615
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 15 detected source(s) for 1327910_g318
Aspect correction adds -0.00017 degrees (-0.041 sec of time = -0.57 arc sec) to RA
Aspect correction adds 0.00130 degrees ( 4.68 arcsec) to Dec
Total aspect correction is 4.72 arcsec
Star catalogs centered at 261.5155 , 22.2682 with radius 2.37 arc min.
n_usno: 108 n_gsc: 112
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 15 matched entries is 0.376" for 1327910_g318
Mean and std. dev of mag. difference (MAG_DELTA) are 0.657 and 0.559 for 1327910_g318
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1327910_g318.
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 15 in the list of sources is a candidate afterglow for 1327910_g318 with genie
ra=261.49230 (17:25:58.15) dec=22.27235 (+22:16:20.5) +/- 0.6" mag=16.19+/-0.14
dist=58.1 REFID=8 major=4.9 minor=2.8 flag=16 (aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 92.8 arc sec from the BAT position.
This source is near the edge of image (0.922)
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 11.7 -1 USNO-B1 20.37 19.20 19.72
261.4914 22.2741 6.9 -1 USNO-B1 20.07 19.23 19.60
261.4886 22.2731 12.5 -1 USNO-B1 12.54 11.80 12.13 *
261.4959 22.2718 12.2 -1 GSC2.3 19.22 20.36 19.42
261.4916 22.2742 7.1 -1 GSC2.3 99.99 99.99 99.99
261.4890 22.2746 13.5 -1 GSC2.3 99.99 99.99 99.99
261.4886 22.2731 12.5 -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 10095.815 counts in the bkg source region of 5492.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.838 counts/pixel (5-sig UL in 4" is 20.13 mag) for 1327910_g318
There are 345.60434 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 1.745 counts/pixel for 1327910_g318
There are 1990.9132 counts in the xrt_bkg source region of 1095.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 1.818 counts/pixel (5-sig UL in 4" is 20.14 mag) for 1327910_g318
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 20.69, 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_772560615_250625d21h44m22s840259usUT_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(261.5147,22.2714,45")
fk5;-circle(261.514705190051,22.2614711964822,6")
fk5;-circle(261.508321271913,22.2619937658311,6")
fk5;-circle(261.51586845436,22.2764229286404,6")
fk5;-circle(261.526702563954,22.2749153075601,6")
fk5;-circle(261.506852896091,22.2745661692649,6")
fk5;-circle(261.515705915987,22.2806414575736,6")
fk5;-circle(261.504272979126,22.2748993632292,6")
fk5;-circle(261.51175954956,22.2831236179619,6")
Region file: 1327910_772560615_250625d21h44m22s840259usUT_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_772560615_250625d21h44m22s840259usUT_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(261.514705190051,22.2614711964822,6")
fk5;-circle(261.508321271913,22.2619937658311,6")
fk5;-circle(261.506852896091,22.2745661692649,6")
image paragraph message for exposure 2 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 250 seconds with the U filter starting
282 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
0.054.
------- notes for trigger 1327910 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250625d21h44m27s653267usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1327910
-expid=772560615 -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 772560615.21912 or about 2025:177:16:10:10 UT
Found 1237 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 12% of the srclist region. Found 165 sources in
srclist catalog. Found 22 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 15 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 20.69 mag. Found 111 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 10095.8 counts in the large background region of 5492.0 pixels or a rate
of 1.838 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 19.93 mag. for a
4-arcsec aperture.
Found 345.6 counts in the XRT position region of 198.0 pixels or a rate of
1.745 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.058 +/- 0.081 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.243 cps or 19.67 mag. The closest srclist
source has ra= 261.5081 dec= 22.2620 mag=18.71 sep=19.34". The closest Genie
source has ra= 261.5083 dec= 22.2620 mag=17.82 sep=19.23".
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?
772560615 282 U srclist found no candidates.
772560615 282 U 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.
772561192 859 WHITE srclist found no candidates.
772561192 859 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 22.26731
GRB_ERROR: 5.75
GRB_RA: 261.50887
IMAGE_START_TIME: 16:10:10
MAGNITUDE: 19.7
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT