image overlap message for exposure 1 of trigger 1315630
uvot_overlap.pl vrs. 2010-12-20b fem started at 250520d08h04m36s599035usUT
The observation of trigger 1315630 started 2025-05-20T02:45:21.2
Examining file ./1315630_g184_uvot_sky_image.fits
The exposure ID is 769401921
The exposure time is 149.846 (seconds)
The filter is WHITE.
The uvot region is centered at (282.2749,-11.8439) 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 0.446 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 (282.2858,-11.8691) with a radius of 0.042 arc min
This is 1.640 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 0.002 sq. arc min or 0.34 of the XRT error circle
image afterglow message for exposure 1 of trigger 1315630
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250520d08h04m42s716201usUT
Observation start time is 2025-05-20T02:45:21.2
Examining file ./1315630_g184_uvot_catalog_image.fits
The exposure ID is 769401921
The exposure is 149.846 sec.
The bin size is 2 pixels
The filter is WHITE
There are 59 detected source(s) for 1315630_g184
Aspect correction adds 0.00044 degrees (0.105 sec of time = 1.55 arc sec) to RA
Aspect correction adds -0.00106 degrees (-3.83 arcsec) to Dec
Total aspect correction is 4.13 arcsec
Star catalogs centered at 282.2753 , -11.8454 with radius 2.89 arc min.
n_usno: 1154 n_gsc: 604
*** 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 64 matched entries is 0.730" for 1315630_g184
Mean and std. dev of mag. difference (MAG_DELTA) are 1.260 and 0.671 for 1315630_g184
Found 3 entries without IDs and 2 entries that are acceptable afterglow candidates for 1315630_g184.
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.
1 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 24 in the list of sources is a candidate afterglow for 1315630_g184 with genie
ra=282.26917 (18:49:04.60) dec=-11.86153 (-11:51:41.5) +/- 0.6" mag=17.76+/-0.14
dist=64.5 REFID=55 major=1.1 minor=1.1 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 52.5 arc sec from the BAT position.
Found 25 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
282.2726 -11.8571 19.9 -1 USNO-B1 21.98 19.16 20.41
282.2686 -11.8560 19.9 -1 USNO-B1 21.84 20.36 21.02
282.2707 -11.8586 11.6 -1 USNO-B1 19.08 17.16 18.01
282.2734 -11.8610 14.9 -1 USNO-B1 19.05 17.74 18.32
282.2737 -11.8619 16.0 -1 USNO-B1 19.26 17.13 18.08
282.2679 -11.8603 6.3 -1 USNO-B1 19.18 15.87 17.34
282.2715 -11.8618 8.3 -1 USNO-B1 17.33 14.98 16.03
282.2647 -11.8588 18.7 -1 USNO-B1 99.99 20.28 99.99
282.2686 -11.8611 2.5 -1 USNO-B1 17.79 14.88 16.17 *
282.2743 -11.8632 19.0 -1 USNO-B1 20.39 17.84 18.97
282.2653 -11.8603 14.5 -1 USNO-B1 21.63 19.18 20.27
282.2650 -11.8606 15.2 -1 USNO-B1 99.99 19.52 99.99
282.2710 -11.8636 10.0 -1 USNO-B1 20.74 18.56 19.53
282.2671 -11.8632 9.4 -1 USNO-B1 17.73 15.39 16.43
282.2680 -11.8637 8.9 -1 USNO-B1 17.08 19.82 18.60
282.2686 -11.8641 9.5 -1 USNO-B1 99.99 18.16 99.99
282.2710 -11.8668 19.9 -1 USNO-B1 99.99 19.29 99.99
282.2705 -11.8586 11.5 -1 GSC2.3 17.38 19.04 99.99
282.2735 -11.8609 15.3 -1 GSC2.3 99.99 19.87 99.99
282.2676 -11.8602 7.1 -1 GSC2.3 16.41 19.06 99.99
282.2737 -11.8620 16.1 -1 GSC2.3 17.62 19.53 99.99
282.2713 -11.8618 7.7 -1 GSC2.3 15.05 17.36 15.68
282.2690 -11.8615 0.5 -1 GSC2.3 15.29 17.90 16.30 *
282.2669 -11.8631 9.6 -1 GSC2.3 15.54 17.85 16.13
282.2687 -11.8643 10.1 -1 GSC2.3 17.60 19.71 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
-----------------
Entry 25 in the list of sources is a candidate afterglow for 1315630_g184 with genie
ra=282.27849 (18:49:06.84) dec=-11.83609 (-11:50:09.9) +/- 0.6" mag=16.69+/-0.14
dist=121.7 REFID=17 major=1.0 minor=1.0 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 53.9 arc sec from the BAT position.
Found 29 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
282.2781 -11.8411 18.0 -1 USNO-B1 99.99 17.22 99.99
282.2764 -11.8384 11.1 -1 USNO-B1 16.00 99.99 99.99
282.2741 -11.8383 17.4 -1 USNO-B1 18.79 16.56 17.55
282.2773 -11.8378 7.5 -1 USNO-B1 15.71 12.25 13.79
282.2769 -11.8372 7.1 -1 USNO-B1 17.28 12.34 14.53
282.2780 -11.8366 2.6 -1 USNO-B1 16.13 16.14 16.14 *
282.2731 -11.8364 19.1 -1 USNO-B1 19.16 18.48 18.78
282.2814 -11.8375 11.6 -1 USNO-B1 19.20 16.84 17.89
282.2820 -11.8373 13.0 -1 USNO-B1 99.99 20.23 99.99
282.2811 -11.8364 9.1 -1 USNO-B1 99.99 15.50 99.99
282.2810 -11.8361 8.8 -1 USNO-B1 17.67 16.06 16.78
282.2773 -11.8343 7.5 -1 USNO-B1 99.99 21.01 99.99
282.2838 -11.8364 18.8 -1 USNO-B1 20.23 18.42 19.22
282.2739 -11.8331 19.3 -1 USNO-B1 99.99 19.45 99.99
282.2825 -11.8347 14.9 -1 USNO-B1 20.86 18.66 19.63
282.2801 -11.8330 12.6 -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 18.8 -1 USNO-B1 19.45 17.60 18.42
282.2760 -11.8388 13.1 -1 GSC2.3 14.95 16.78 15.53
282.2738 -11.8382 18.1 -1 GSC2.3 16.81 19.15 99.99
282.2776 -11.8383 8.4 -1 GSC2.3 14.00 17.61 15.06
282.2764 -11.8369 7.8 -1 GSC2.3 16.51 18.55 99.99
282.2731 -11.8365 18.9 -1 GSC2.3 17.72 19.41 99.99
282.2783 -11.8362 0.8 -1 GSC2.3 14.90 16.74 15.34 *
282.2812 -11.8377 11.3 -1 GSC2.3 17.29 19.25 99.99
282.2808 -11.8361 8.0 -1 GSC2.3 15.86 17.94 16.63
282.2838 -11.8364 18.7 -1 GSC2.3 18.01 20.16 99.99
282.2809 -11.8311 19.6 -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 65535.852 counts in the bkg source region of 4466.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 14.674 counts/pixel (5-sig UL in 4" is 19.89 mag) for 1315630_g184
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 20.45, 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_769401921_250520d08h04m42s716201usUT_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(282.2749,-11.8439,45")
fk5;-circle(282.27043398893,-11.8467643759874,6")
fk5;-circle(282.26493889081,-11.8457142176458,6")
fk5;-circle(282.26752591172,-11.8432244101507,6")
fk5;-circle(282.271000634058,-11.8426985612556,6")
fk5;-circle(282.263533907102,-11.8501934699588,6")
fk5;-circle(282.274608834721,-11.8499465924735,6")
fk5;-circle(282.27622083509,-11.8469091193578,6")
fk5;-circle(282.27786114904,-11.8493863822713,6")
fk5;-circle(282.272423622185,-11.8561576280394,6")
fk5;-circle(282.277517233937,-11.8425773077147,6")
fk5;-circle(282.268507107663,-11.8364599345361,6")
fk5;-circle(282.276004932665,-11.8386807816144,6")
fk5;-circle(282.279517511713,-11.8530288382343,6")
fk5;-circle(282.277655652146,-11.8381932117406,6")
fk5;-circle(282.278485369309,-11.8360852657991,6")
fk5;-circle(282.271361219024,-11.8309873814322,6")
fk5;-circle(282.283520528719,-11.8409301817,6")
fk5;-circle(282.280924998126,-11.836028034752,6")
fk5;-circle(282.285505161581,-11.8506192150438,6")
fk5;-circle(282.286674723669,-11.8401178974745,6")
image paragraph message for exposure 1 of trigger 1315630
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: high density of stars, partial overlap
SRCLIST PROBLEM: high density of stars, srclist filled telemetry buffer
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 148 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 34% of
the XRT error circle. Because of the density of catalogued stars, further
analysis is required to report an upper limit for any afterglow in the
sub-image. The 8'x8' region for the list of sources generated on-board covers
100% of the XRT error circle. Because of the density of catalogued stars,
further analysis is required to report an upper limit for any afterglow in the
region. 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 250520d08h04m48s406708usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1315630
-expid=769401921 -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 srclist.
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 769401921.1783 or about 2025:141:02:45:16 UT
Found 5000 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 84% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 18 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 59 source(s) in Genie image catalog. Found 3 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.45 mag. Found 1150 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
95% of the Genie image region.
Genie image analysis:
Found 65535.9 counts in the large background region of 4466.0 pixels or a rate
of 14.674 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 19.72 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 18.88 mag. The closest srclist
source has ra= 282.2908 dec= -11.8631 mag=16.25 sep=28.05". The closest Genie
source has ra= 282.2910 dec= -11.8662 mag=17.80 sep=21.27".
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?
769401921 148 WHITE srclist found no candidates.
769401921 148 WHITE image found no candidates.
List afterglow candidates for other finding charts.
769402648 875 ? srclist data are not available.
769402648 875 WHITE image found no candidates.
------- Tokens for Quick GCN -------