image overlap message for exposure 1 of trigger 1402466
uvot_overlap.pl vrs. 2010-12-20b fem started at 251008d08h07m00s457212usUT
The observation of trigger 1402466 started 2025-10-07T19:38:53.2
Examining file ./1402466_g114_uvot_sky_image.fits
The exposure ID is 781558733
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (128.1841,21.8128) with a roll angle of 105.3
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 (128.1730,21.8230) with a radius of 3.000 arc min
This is 0.870 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 (128.1765,21.8130) with a radius of 0.033 arc min
This is 0.422 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1402466
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251008d08h07m03s562279usUT
Observation start time is 2025-10-07T19:38:53.2
Examining file ./1402466_g114_uvot_catalog_image.fits
The exposure ID is 781558733
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 8 detected source(s) for 1402466_g114
Aspect correction adds 0.00115 degrees (0.276 sec of time = 3.84 arc sec) to RA
Aspect correction adds -0.00061 degrees (-2.19 arcsec) to Dec
Total aspect correction is 4.42 arcsec
Star catalogs centered at 128.1831 , 21.8115 with radius 2.58 arc min.
n_usno: 64 n_gsc: 57
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.44756
RA DEC Mag Color
bright star 0: 128.21444 (08:32:51.47) 21.82194 (+21:49:19.0) 11.45 USNO-V
Mean distance difference (CAT_DELTA) for 5 matched entries is 0.553" for 1402466_g114
Mean and std. dev of mag. difference (MAG_DELTA) are 1.782 and 1.753 for 1402466_g114
Found 3 entries without IDs and 2 entries that are acceptable afterglow candidates for 1402466_g114.
Acceptable entries have no ID, XRT distances < 5", 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=128.1730 (08:32:41.52) DEC=21.8230 (+21:49:22.8)
XRT distances are from RA=128.1765 (08:32:42.36) DEC=21.8130 (+21:48:46.7)
*** WARNING 37 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1402466_g114 with genie
ra=128.17665 (08:32:42.40) dec=21.81280 (+21:48:46.1) +/- 0.6" mag=18.38+/-0.15
dist=0.8 REFID=5 major=0.9 minor=0.9 flag=0
Found 5 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
128.1825 21.8122 19.7 -1 USNO-B1 20.51 18.54 19.41
128.1820 21.8114 18.6 -1 USNO-B1 17.07 15.28 16.07
128.1821 21.8112 18.9 -1 GSC2.3 15.36 16.29 16.25
128.1732 21.8131 11.5 -1 GSC2.3 20.54 99.99 99.99
128.1724 21.8162 18.9 -1 GSC2.3 20.43 99.99 99.99
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 6 in the list of sources is a candidate afterglow for 1402466_g114 with genie
ra=128.20216 (08:32:48.52) dec=21.79561 (+21:47:44.2) +/- 0.6" mag=18.13+/-0.15
dist=106.1 REFID=4 major=3.0 minor=1.7 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 138.6 arc sec from the BAT position.
This source is near the edge of image (1.077)
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
128.2049 21.7976 11.7 -1 USNO-B1 20.53 19.43 19.92
128.2050 21.7975 11.5 -1 GSC2.3 20.05 22.16 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 3.0
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=128.17665 (08:32:42.40) dec=21.81280 (+21:48:46.1) +/- 0.6" mag=18.38+/-0.15 dist=0.8 REFID=5 flag=0
There are 1.1523538E+05 counts in the bkg source region of 5989.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 19.241 counts/pixel (5-sig UL in 4" is 19.74 mag) for 1402466_g114
There are 1507.4329 counts in the src source region of 49.000000 pixels.
Rate in src region with 4 arcsec radius is 30.764 counts/pixel for 1402466_g114
There are 21743.365 counts in the cand_src_bkg source region of 1145.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 18.990 counts/pixel (5-sig UL in 4" is 19.75 mag) for 1402466_g114
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 20.30, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1402466_781558733_251008d08h07m03s562279usUT_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(128.1841,21.8128,45")
fk5;-circle(128.176653184055,21.8127977422521,6")
fk5;-circle(128.182114334935,21.8113737836585,6")
fk5;-circle(128.19097262988,21.8124713640945,6")
Region file: 1402466_781558733_251008d08h07m03s562279usUT_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(128.176653184055,21.8127977422521,4")
Region file: 1402466_781558733_251008d08h07m03s562279usUT_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(128.176653184055,21.8127977422521,25")
fk5;-circle(128.176653184055,21.8127977422521,15")
fk5;-circle(128.182114334935,21.8113737836585,6")
image paragraph message for exposure 1 of trigger 1402466
------ Start for Possible Stand-alone Circular ----
In response to GRB251007 (Swift/BAT trigger 1402466) at 19:36:58 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 78 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 08:32:42.40 = 128.17665
DEC(J2000) = +21:48:46.1 = 21.81280
with a 90%-confidence error radius of about 0.63 arc sec. This position is 0.8
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.38 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.039.
------- notes for trigger 1402466 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251008d08h07m09s274235usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1402466
-expid=781558733 -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/1402466/
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 781558733.20336 or about 2025:281:19:38:48 UT
Found 303 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 39 sources in
srclist catalog. Found 6 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 8 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 3 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.30 mag. Found 60 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 6% 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?
781558733 78 WHITE 128.17677 21.81294 18.73/19.2 0.9 srclist Yes
781558733 78 WHITE 128.17665 21.81280 18.38/20.3 0.8 image Yes
List afterglow candidates for other finding charts.
781558945 290 U srclist found no candidates.
781558945 290 U 128.17662 21.81272 18.86/19.7 4.9 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 21.81280
GRB_ERROR: 0.63
GRB_RA: 128.17665
IMAGE_START_TIME: 19:38:48
MAGNITUDE: 18.38
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT