image overlap message for exposure 2 of trigger 1315630
uvot_overlap.pl vrs. 2010-12-20b fem started at 250520d08h04m37s281342usUT
The observation of trigger 1315630 started 2025-05-20T02:57:28.2
Examining file ./1315630_g911_uvot_sky_image.fits
The exposure ID is 769402648
The exposure time is 149.857 (seconds)
The filter is WHITE.
*** Warning -- found 17695 null pixels in the image.
The uvot region is centered at (282.2745,-11.8449) with a roll angle of 73.4
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 (282.2680,-11.8470) with a radius of 3.000 arc min
This is 0.401 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 5.05 sq. arc min or 0.18 of the BAT error circle
The XRT error circle is centered at (282.2858,-11.8691) with a radius of 0.042 arc min
This is 1.596 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 0.00 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1315630
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250520d08h04m52s454101usUT
Observation start time is 2025-05-20T02:57:28.2
Examining file ./1315630_g911_uvot_catalog_image.fits
The exposure ID is 769402648
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 16 detected source(s) for 1315630_g911
Aspect correction adds 0.00067 degrees (0.161 sec of time = 2.36 arc sec) to RA
Aspect correction adds -0.00123 degrees (-4.41 arcsec) to Dec
Total aspect correction is 5.01 arcsec
Star catalogs centered at 282.2764 , -11.8451 with radius 2.65 arc min.
n_usno: 963 n_gsc: 503
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.19466
RA DEC Mag Color
bright star 0: 282.25394 (18:49:00.95) -11.84273 (-11:50:33.8) 11.19 USNO-V
Mean distance difference (CAT_DELTA) for 20 matched entries is 0.806" for 1315630_g911
Mean and std. dev of mag. difference (MAG_DELTA) are 0.997 and 0.758 for 1315630_g911
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1315630_g911.
Acceptable entries have no ID, XRT distances < 6.25", 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=282.2680 (18:49:04.32) DEC=-11.8470 (-11:50:49.2)
XRT distances are from RA=282.2858 (18:49:08.58) DEC=-11.8691 (-11:52:08.9)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1315630_g911 with genie
ra=282.27839 (18:49:06.81) dec=-11.83607 (-11:50:09.9) +/- 0.6" mag=16.83+/-0.14
dist=121.8 REFID=14 major=0.9 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 53.7 arc sec from the BAT position.
Found 29 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
282.2781 -11.8411 18.0 -1 USNO-B1 99.99 17.22 99.99
282.2764 -11.8384 10.9 -1 USNO-B1 16.00 99.99 99.99
282.2741 -11.8383 17.2 -1 USNO-B1 18.79 16.56 17.55
282.2773 -11.8378 7.4 -1 USNO-B1 15.71 12.25 13.79
282.2769 -11.8372 6.8 -1 USNO-B1 17.28 12.34 14.53
282.2780 -11.8366 2.4 -1 USNO-B1 16.13 16.14 16.14 *
282.2814 -11.8375 11.9 -1 USNO-B1 19.20 16.84 17.89
282.2731 -11.8364 18.8 -1 USNO-B1 19.16 18.48 18.78
282.2820 -11.8373 13.4 -1 USNO-B1 99.99 20.23 99.99
282.2811 -11.8364 9.5 -1 USNO-B1 99.99 15.50 99.99
282.2810 -11.8361 9.1 -1 USNO-B1 17.67 16.06 16.78
282.2773 -11.8343 7.3 -1 USNO-B1 99.99 21.01 99.99
282.2838 -11.8364 19.1 -1 USNO-B1 20.23 18.42 19.22
282.2825 -11.8347 15.2 -1 USNO-B1 20.86 18.66 19.63
282.2739 -11.8331 19.0 -1 USNO-B1 99.99 19.45 99.99
282.2801 -11.8330 12.8 -1 USNO-B1 99.99 20.44 99.99
282.2786 -11.8318 15.6 -1 USNO-B1 21.51 19.48 20.38
282.2783 -11.8315 16.6 -1 USNO-B1 21.02 19.15 19.98
282.2808 -11.8314 18.9 -1 USNO-B1 19.45 17.60 18.42
282.2760 -11.8388 12.9 -1 GSC2.3 14.95 16.78 15.53
282.2776 -11.8383 8.3 -1 GSC2.3 14.00 17.61 15.06
282.2738 -11.8382 17.8 -1 GSC2.3 16.81 19.15 99.99
282.2764 -11.8369 7.5 -1 GSC2.3 16.51 18.55 99.99
282.2812 -11.8377 11.7 -1 GSC2.3 17.29 19.25 99.99
282.2783 -11.8362 0.6 -1 GSC2.3 14.90 16.74 15.34 *
282.2731 -11.8365 18.6 -1 GSC2.3 17.72 19.41 99.99
282.2808 -11.8361 8.4 -1 GSC2.3 15.86 17.94 16.63
282.2838 -11.8364 19.0 -1 GSC2.3 18.01 20.16 99.99
282.2809 -11.8311 19.7 -1 GSC2.3 17.93 99.99 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
Found 7 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
282.2837 -11.8678 8.6 -1 USNO-B1 99.99 20.31 99.99
282.2855 -11.8683 3.0 -1 USNO-B1 19.73 17.98 18.75
282.2866 -11.8696 3.3 -1 USNO-B1 99.99 19.94 99.99
282.2855 -11.8713 7.7 -1 USNO-B1 18.05 16.55 17.22
282.2864 -11.8713 8.0 -1 USNO-B1 20.31 17.39 18.69
282.2854 -11.8683 3.4 -1 GSC2.3 17.89 19.83 99.99
282.2853 -11.8713 7.9 -1 GSC2.3 16.55 18.35 17.18
The closest star is 2.97" away.
List UVOT sources within 10" of the XRT position:
There are 7317.4263 counts in the bkg source region of 447.00000 pixels.
Rate in bkg region from 0 to 45 arcsec is 16.370 counts/pixel (5-sig UL in 4" is 19.83 mag) for 1315630_g911
Do not compute counts in XRT region because position is too far from center.
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 < 6.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1315630_769402648_250520d08h04m52s454101usUT_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(282.2745,-11.8449,45")
fk5;-circle(282.278389595938,-11.8360709289184,6")
fk5;-circle(282.280847896918,-11.8360633826796,6")
image paragraph message for exposure 2 of trigger 1315630
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no overlap
SRCLIST PROBLEM: no srclist afterglow info
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB250520 (Swift/BAT trigger 1315630) at 02:42:16 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 875 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 none of
the XRT error circle. Results from the list of sources generated on-board are
not available at this time. No correction has been made for the large, but
uncertain, extinction expected.
------- notes for trigger 1315630 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250520d08h04m58s476900usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1315630
-expid=769402648 -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/1315630/
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 Genie
image. BAT position found.
UVOT exposure began at MET 769402648.23664 or about 2025:141:02:57:23 UT
No information found about the number of stars in the star catalog for srclist
region.
Found 16 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 20.39 mag. Found 959 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
94% of the Genie image region. The Genie image is INCOMPLETE with 17695 null
pixels.
Genie image analysis:
Found 7317.4 counts in the large background region of 447.0 pixels or a rate of
16.370 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 19.66 mag. for a
4-arcsec aperture. The closest Genie source has ra= 282.2950 dec= -11.8388
mag=17.26 sep=114.00".
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?
769402648 875 WHITE srclist data are not available.
769402648 875 WHITE image found no candidates.
List afterglow candidates for other finding charts.
769401921 148 WHITE srclist found no candidates.
769401921 148 WHITE image found no candidates.
------- Tokens for Quick GCN -------