image overlap message for exposure 1 of trigger 1324646
uvot_overlap.pl vrs. 2010-12-20b fem started at 250616d02h49m45s987088usUT
The observation of trigger 1324646 started 2025-06-15T22:28:27.7
Examining file ./1324646_g187_uvot_sky_image.fits
The exposure ID is 771719307
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (290.3876,4.6919) 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 2.869 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 3.66 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 0.422 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 1324646
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250616d02h49m52s619476usUT
Observation start time is 2025-06-15T22:28:27.7
Examining file ./1324646_g187_uvot_catalog_image.fits
The exposure ID is 771719307
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 12 detected source(s) for 1324646_g187
Aspect correction adds 0.00105 degrees (0.253 sec of time = 3.78 arc sec) to RA
Aspect correction adds 0.00070 degrees ( 2.53 arcsec) to Dec
Total aspect correction is 4.55 arcsec
Star catalogs centered at 290.3893 , 4.6889 with radius 2.77 arc min.
n_usno: 356 n_gsc: 480
*** 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 12 matched entries is 0.599" for 1324646_g187
Mean and std. dev of mag. difference (MAG_DELTA) are 2.361 and 0.612 for 1324646_g187
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1324646_g187.
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 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 19545.129 counts in the bkg source region of 6148.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.179 counts/pixel (5-sig UL in 4" is 19.84 mag) for 1324646_g187
There are 602.18774 counts in the xrt source region of 196.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.072 counts/pixel for 1324646_g187
There are 3539.5720 counts in the xrt_bkg source region of 1164.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 3.041 counts/pixel (5-sig UL in 4" is 19.86 mag) for 1324646_g187
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 20.39, 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_771719307_250616d02h49m52s619476usUT_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(290.3876,4.6919,45")
fk5;-circle(290.381536364332,4.68756981144396,6")
fk5;-circle(290.37538823263,4.68743987516187,6")
fk5;-circle(290.401260426835,4.69119525557391,6")
Region file: 1324646_771719307_250616d02h49m52s619476usUT_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_771719307_250616d02h49m52s619476usUT_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(290.381536364332,4.68756981144396,6")
image paragraph message for exposure 1 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 250 seconds with the U filter starting
152 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 large, but uncertain, extinction expected.
------- notes for trigger 1324646 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250616d02h49m59s833346usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1324646
-expid=771719307 -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 771719307.65134 or about 2025:167:22:28:22 UT
Found 4401 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 36% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 25 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 12 source(s) in Genie image catalog. Found 0 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.39 mag. Found 423 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 19545.1 counts in the large background region of 6148.0 pixels or a rate
of 3.179 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 19.63 mag. for a
4-arcsec aperture.
Found 602.2 counts in the XRT position region of 196.0 pixels or a rate of
3.072 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.025 +/- 0.106 (1-sigma) cps or
22.15 mag and a range from 20.34 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.343 cps or 19.30 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.92 mag. The closest
srclist source has ra= 290.3755 dec= 4.6847 mag=18.52 sep=36.36". The closest
Genie source has ra= 290.3815 dec= 4.6876 mag=19.87 sep=17.22".
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?
771719307 151 U srclist found no candidates.
771719307 151 U image found no candidates.
List afterglow candidates for other finding charts.
771720034 878 WHITE srclist found no candidates.
771720034 878 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 4.68514
GRB_ERROR: 5.75
GRB_RA: 290.38567
IMAGE_START_TIME: 22:28:22
MAGNITUDE: 19.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT