image overlap message for exposure 2 of trigger 1324646
uvot_overlap.pl vrs. 2010-12-20b fem started at 250616d02h49m46s720225usUT
The observation of trigger 1324646 started 2025-06-15T22:40:34.7
Examining file ./1324646_g914_uvot_sky_image.fits
The exposure ID is 771720034
The exposure time is 149.846 (seconds)
The filter is WHITE.
The uvot region is centered at (290.3874,4.6916) with a roll angle of 40.8
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 (290.3440,4.6720) with a radius of 3.000 arc min
This is 2.847 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 3.71 sq. arc min or 0.13 of the BAT error circle
The XRT error circle is centered at (290.3857,4.6851) with a radius of 0.038 arc min
This is 0.401 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 1324646
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250616d02h51m00s599035usUT
Observation start time is 2025-06-15T22:40:34.7
Examining file ./1324646_g914_uvot_catalog_image.fits
The exposure ID is 771720034
The exposure is 149.846 sec.
The bin size is 2 pixels
The filter is WHITE
There are 37 detected source(s) for 1324646_g914
Aspect correction adds 0.00174 degrees (0.418 sec of time = 6.24 arc sec) to RA
Aspect correction adds 0.00068 degrees ( 2.46 arcsec) to Dec
Total aspect correction is 6.71 arcsec
Star catalogs centered at 290.3892 , 4.6895 with radius 2.74 arc min.
n_usno: 349 n_gsc: 471
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 10.22064
RA DEC Mag Color
bright star 0: 290.40136 (19:21:36.33) 4.69129 (+04:41:28.6) 11.34 USNO-V
bright star 1: 290.35146 (19:21:24.35) 4.68129 (+04:40:52.6) 10.22 USNO-V
Mean distance difference (CAT_DELTA) for 36 matched entries is 0.532" for 1324646_g914
Mean and std. dev of mag. difference (MAG_DELTA) are 1.891 and 0.546 for 1324646_g914
Found 1 entries without IDs and 0 entries that are acceptable afterglow candidates for 1324646_g914.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=290.3440 (19:21:22.56) DEC= 4.6720 (+04:40:19.2)
XRT distances are from RA=290.3857 (19:21:32.56) DEC= 4.6851 (+04:41:06.5)
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 27:
ra=290.40108 dec= 4.70461 +/- 0.6" mag=16.59+/-0.14 dist=89.3 REFID=18 flag=3
Found 1 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
290.3880 4.6855 8.5 -1 GSC2.3 99.99 21.07 99.99
The closest star is 8.48" away.
List UVOT sources within 10" of the XRT position:
There are 64543.801 counts in the bkg source region of 5393.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 11.968 counts/pixel (5-sig UL in 4" is 20.00 mag) for 1324646_g914
There are 2326.1506 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 11.689 counts/pixel for 1324646_g914
There are 12191.546 counts in the xrt_bkg source region of 1032.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 11.814 counts/pixel (5-sig UL in 4" is 20.01 mag) for 1324646_g914
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 20.56, 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: 1324646_771720034_250616d02h51m00s599035usUT_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(290.3874,4.6916,45")
fk5;-circle(290.381466096194,4.68768484697179,6")
fk5;-circle(290.381619039487,4.68174497814468,6")
fk5;-circle(290.380327377744,4.69044905561106,6")
fk5;-circle(290.375461372591,4.68450732142379,6")
fk5;-circle(290.375401311499,4.68756577997244,6")
fk5;-circle(290.395502558815,4.68316484174099,6")
fk5;-circle(290.380123846534,4.69637266017071,6")
fk5;-circle(290.389017542302,4.6988925583216,6")
fk5;-circle(290.374906346429,4.69561229718679,6")
fk5;-circle(290.384923408627,4.69972417954728,6")
fk5;-circle(290.398642080728,4.69487116506725,6")
fk5;-circle(290.401505628454,4.69150214436546,6")
Region file: 1324646_771720034_250616d02h51m00s599035usUT_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(290.38567,4.68514,8")
Region file: 1324646_771720034_250616d02h51m00s599035usUT_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(290.38567,4.68514,25")
fk5;-circle(290.38567,4.68514,15")
fk5;-circle(290.381466096194,4.68768484697179,6")
fk5;-circle(290.381619039487,4.68174497814468,6")
fk5;-circle(290.380327377744,4.69044905561106,6")
image paragraph message for exposure 2 of trigger 1324646
SRCLIST PROBLEM: srclist filled telemetry buffer
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB250615 (Swift/BAT trigger 1324646) at 22:25:19 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 879 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 large, but uncertain, extinction expected.
------- notes for trigger 1324646 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250616d02h51m17s750118usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1324646
-expid=771720034 -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/1324646/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for xrt position. XRT position found for srclist.
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 771720034.6544 or about 2025:167:22:40:29 UT
Found 3521 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 35% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 9 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 37 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 20.56 mag. Found 415 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
38% of the Genie image region.
Genie image analysis:
Found 64543.8 counts in the large background region of 5393.0 pixels or a rate
of 11.968 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 19.83 mag. for a
4-arcsec aperture.
Found 2326.2 counts in the XRT position region of 199.0 pixels or a rate of
11.689 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.165 +/- 0.351 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.054 cps or 19.55 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 18.93
mag. The closest srclist source has ra= 290.3816 dec= 4.6818 mag=18.23
sep=19.01". The closest Genie source has ra= 290.3815 dec= 4.6877 mag=18.28
sep=17.65".
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?
771720034 878 WHITE srclist found no candidates.
771720034 878 WHITE image found no candidates.
List afterglow candidates for other finding charts.
771719307 151 U srclist found no candidates.
771719307 151 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 4.68514
GRB_ERROR: 5.75
GRB_RA: 290.38567
IMAGE_START_TIME: 22:40:29
MAGNITUDE: 19.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT