image overlap message for exposure 1 of trigger 1351790
uvot_overlap.pl vrs. 2010-12-20b fem started at 250924d21h36m42s448655usUT
The observation of trigger 1351790 started 2025-09-24T08:22:18.4
Examining file ./1351790_g228_uvot_sky_image.fits
The exposure ID is 780394938
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (51.8852,74.6641) with a roll angle of 51.6
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 (51.8650,74.6520) with a radius of 3.000 arc min
This is 0.796 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 (51.8724,74.6585) with a radius of 0.037 arc min
This is 0.397 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1351790
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250924d21h36m46s976305usUT
Observation start time is 2025-09-24T08:22:18.4
Examining file ./1351790_g228_uvot_catalog_image.fits
The exposure ID is 780394938
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 31 detected source(s) for 1351790_g228
Aspect correction adds 0.00556 degrees (1.335 sec of time = 5.30 arc sec) to RA
Aspect correction adds 0.00038 degrees ( 1.35 arcsec) to Dec
Total aspect correction is 5.47 arcsec
Star catalogs centered at 51.8788 , 74.6654 with radius 2.84 arc min.
n_usno: 135 n_gsc: 145
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.826
RA DEC Mag Color
bright star 0: 51.84171 (03:27:22.01) 74.62269 (+74:37:21.7) 11.83 GSC-V
Mean distance difference (CAT_DELTA) for 26 matched entries is 0.428" for 1351790_g228
Mean and std. dev of mag. difference (MAG_DELTA) are 1.065 and 0.802 for 1351790_g228
Found 5 entries without IDs and 5 entries that are acceptable afterglow candidates for 1351790_g228.
Acceptable entries have no ID, XRT distances < 5.5", 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=51.8650 (03:27:27.60) DEC=74.6520 (+74:39:07.2)
XRT distances are from RA=51.8724 (03:27:29.37) DEC=74.6585 (+74:39:30.5)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1351790_g228 with genie
ra=51.87340 (03:27:29.62) dec=74.65945 (+74:39:34.0) +/- 0.6" mag=17.74+/-0.14
dist=3.7 REFID=21 major=1.0 minor=1.0 flag=0
Found 2 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
51.8840 74.6637 18.4 -1 USNO-B1 18.83 16.93 17.77
51.8843 74.6636 18.3 -1 GSC2.3 17.12 18.75 17.64
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 20 in the list of sources is a candidate afterglow for 1351790_g228 with genie
ra=51.94482 (03:27:46.76) dec=74.66094 (+74:39:39.4) +/- 0.6" mag=17.85+/-0.14
dist=69.6 REFID=15 major=2.5 minor=2.2 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 82.6 arc sec from the BAT position.
Found 3 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
51.9422 74.6648 14.0 -1 USNO-B1 16.77 15.64 16.14
51.9540 74.6646 16.0 -1 USNO-B1 12.27 11.84 12.03 *
51.9540 74.6646 16.0 -1 GSC2.3 99.99 99.99 12.05
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 23 in the list of sources is a candidate afterglow for 1351790_g228 with genie
ra=51.96102 (03:27:50.64) dec=74.66194 (+74:39:43.0) +/- 0.6" mag=16.70+/-0.14
dist=85.3 REFID=14 major=0.3 minor=0.3 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 98.2 arc sec from the BAT position.
This source is near the edge of image (0.905)
Found 2 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
51.9540 74.6646 11.8 -1 USNO-B1 12.27 11.84 12.03 *
51.9540 74.6646 11.8 -1 GSC2.3 99.99 99.99 12.05
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
-----------------
Entry 27 in the list of sources is a candidate afterglow for 1351790_g228 with genie
ra=51.96421 (03:27:51.41) dec=74.66757 (+74:40:03.3) +/- 0.6" mag=16.88+/-0.14
dist=93.4 REFID=12 major=1.5 minor=0.9 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 109.9 arc sec from the BAT position.
This source is near the edge of image (0.986)
Found 7 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
51.9540 74.6646 14.3 -1 USNO-B1 12.27 11.84 12.03 *
51.9682 74.6676 3.8 -1 USNO-B1 16.21 14.76 15.40 *
51.9673 74.6709 12.2 -1 USNO-B1 20.29 19.04 19.59
51.9815 74.6702 19.0 -1 USNO-B1 20.87 19.24 19.96
51.9540 74.6646 14.3 -1 GSC2.3 99.99 99.99 12.05
51.9685 74.6676 4.0 -1 GSC2.3 14.66 15.76 15.04 *
51.9677 74.6708 12.0 -1 GSC2.3 18.91 20.57 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
-----------------
Entry 29 in the list of sources is a candidate afterglow for 1351790_g228 with genie
ra=51.94245 (03:27:46.19) dec=74.68957 (+74:41:22.5) +/- 0.7" mag=20.26+/-0.19
dist=130.3 REFID=2 major=0.8 minor=0.3 flag=17 (neighbor+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 154.0 arc sec from the BAT position.
This source is near the edge of image (1.031)
Found 7 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
51.9418 74.6854 15.1 -1 USNO-B1 18.45 16.62 17.43
51.9419 74.6902 2.2 -1 USNO-B1 18.30 16.16 17.11 *
51.9479 74.6904 6.0 -1 USNO-B1 17.46 16.01 16.65
51.9420 74.6853 15.4 -1 GSC2.3 16.92 18.63 17.77
51.9416 74.6900 1.9 -1 GSC2.3 16.72 18.37 17.19 *
51.9487 74.6904 6.6 -1 GSC2.3 16.23 17.44 16.68
51.9615 74.6906 18.5 -1 GSC2.3 19.86 21.54 99.99
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:
Unmatched source ra=51.87340 (03:27:29.62) dec=74.65945 (+74:39:34.0) +/- 0.6" mag=17.74+/-0.14 dist=3.7 REFID=21 flag=0
There are 36918.406 counts in the bkg source region of 5770.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 6.398 counts/pixel (5-sig UL in 4" is 20.34 mag) for 1351790_g228
There are 1459.7313 counts in the src source region of 51.000000 pixels.
Rate in src region with 4 arcsec radius is 28.622 counts/pixel for 1351790_g228
There are 6925.1753 counts in the cand_src_bkg source region of 1068.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 6.484 counts/pixel (5-sig UL in 4" is 20.33 mag) for 1351790_g228
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 20.90, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1351790_780394938_250924d21h36m46s976305usUT_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(51.8852,74.6641,45")
fk5;-circle(51.8734006311118,74.6594496425649,6")
fk5;-circle(51.8545779254552,74.6551473269189,6")
fk5;-circle(51.8568574179585,74.6537795070995,6")
fk5;-circle(51.8836134742762,74.6637707612234,6")
fk5;-circle(51.8468672190742,74.6691341995065,6")
fk5;-circle(51.8460025422206,74.6715172855039,6")
fk5;-circle(51.8635239082455,74.6744885726565,6")
fk5;-circle(51.9365097799236,74.6644803378287,6")
Region file: 1351790_780394938_250924d21h36m46s976305usUT_cand_src.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(51.8734006311118,74.6594496425649,4")
Region file: 1351790_780394938_250924d21h36m46s976305usUT_cand_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(51.8734006311118,74.6594496425649,25")
fk5;-circle(51.8734006311118,74.6594496425649,15")
fk5;-circle(51.8545779254552,74.6551473269189,6")
fk5;-circle(51.8568574179585,74.6537795070995,6")
fk5;-circle(51.8836134742762,74.6637707612234,6")
image paragraph message for exposure 1 of trigger 1351790
------ Start for Possible Stand-alone Circular ----
In response to GRB250924 (Swift/BAT trigger 1351790) at 08:18:29 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 192 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 03:27:29.62 = 51.87340
DEC(J2000) = +74:39:34.0 = 74.65945
with a 90%-confidence error radius of about 0.62 arc sec. This position is 3.7
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.74 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.316.
------- notes for trigger 1351790 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250924d21h36m52s594545usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1351790
-expid=780394938 -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/1351790/
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 780394938.3878 or about 2025:268:08:22:13 UT
Found 668 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 10% of the srclist region. Found 127 sources in
srclist catalog. Found 21 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 31 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 5 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.90 mag. Found 143 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 12% of the Genie image region.
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?
780394938 192 WHITE 51.87355 74.65937 18.33/19.2 3.4 srclist Yes
780394938 192 WHITE 51.87340 74.65945 17.74/20.9 3.7 image Yes
List afterglow candidates for other finding charts.
780395096 350 U 51.87258 74.65915 18.79/18.1 0.3 srclist Yes
780395096 350 U 51.87351 74.65943 18.03/20.6 1.6 image Yes
780395604 858 WHITE srclist found no candidates.
780395604 858 WHITE 51.87320 74.65940 19.44/20.4 1.3 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 74.65945
GRB_ERROR: 0.62
GRB_RA: 51.87340
IMAGE_START_TIME: 08:22:13
MAGNITUDE: 17.74
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT