image overlap message for exposure 1 of trigger 1423875
uvot_overlap.pl vrs. 2010-12-20b fem started at 251214d17h10m47s518354usUT
The observation of trigger 1423875 started 2025-12-14T09:03:58.4
Examining file ./1423875_g100_uvot_sky_image.fits
The exposure ID is 787395838
The exposure time is 149.857 (seconds)
The filter is WHITE.
*** Warning -- found 17492 null pixels in the image.
The uvot region is centered at (330.2111,-9.1699) with a roll angle of 248.6
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 (330.2170,-9.1670) with a radius of 3.000 arc min
This is 0.389 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 4.02 sq. arc min or 0.14 of the BAT error circle
The XRT error circle is centered at (330.2107,-9.1629) with a radius of 0.035 arc min
This is 0.418 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 0.00 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1423875
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251214d17h10m50s960539usUT
Observation start time is 2025-12-14T09:03:58.4
Examining file ./1423875_g100_uvot_catalog_image.fits
The exposure ID is 787395838
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 2 detected source(s) for 1423875_g100
Aspect correction adds -0.00095 degrees (-0.229 sec of time = -3.39 arc sec) to RA
Aspect correction adds -0.00044 degrees (-1.60 arcsec) to Dec
Total aspect correction is 3.75 arcsec
Star catalogs centered at 330.2230 , -9.1813 with radius 2.00 arc min.
n_usno: 25 n_gsc: 27
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 1 matched entries is 0.379" for 1423875_g100
Mean and std. dev of mag. difference (MAG_DELTA) are 0.399 and 0.000 for 1423875_g100
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1423875_g100.
Acceptable entries have no ID, XRT distances < 5.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
Magnitude criteria will be applied later.
BAT distances are from RA=330.2170 (22:00:52.08) DEC=-9.1670 (-09:10:01.2)
XRT distances are from RA=330.2107 (22:00:50.57) DEC=-9.1629 (-09:09:46.5)
*** WARNING 50 per cent of entries have no IDs.
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1423875_g100 with genie
ra=330.22116 (22:00:53.08) dec=-9.18694 (-09:11:13.0) +/- 0.8" mag=19.72+/-0.19
dist=94.1 REFID=1 major=2.2 minor=1.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 73.3 arc sec from the BAT position.
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
330.2172 -9.1872 14.1 -1 USNO-B1 13.62 12.78 13.16
330.2172 -9.1871 14.0 -1 GSC2.3 12.69 13.43 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.2
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 13492.509 counts in the bkg source region of 672.00000 pixels.
Rate in bkg region from 0 to 45 arcsec is 20.078 counts/pixel (5-sig UL in 4" is 19.72 mag) for 1423875_g100
There are 0.0000000 counts in the xrt source region of 0.0000000 pixels.
There are 0.0000000 counts in the xrt_bkg source region of 0.0000000 pixels.
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 20.28, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1423875_787395838_251214d17h10m50s960539usUT_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(330.2111,-9.1699,45")
Region file: 1423875_787395838_251214d17h10m50s960539usUT_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(330.21071,-9.16292,8")
Region file: 1423875_787395838_251214d17h10m50s960539usUT_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(330.21071,-9.16292,25")
fk5;-circle(330.21071,-9.16292,15")
image paragraph message for exposure 1 of trigger 1423875
------ Start for Possible Stand-alone Circular ----
In response to GRB251214 (Swift/BAT trigger 1423875) at 09:02:17 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 63 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 22:00:50.52 = 330.21052
DEC(J2000) = -09:09:46.7 = -9.16296
with a 90%-confidence error radius of about 1.10 arc sec. This position is 0.7
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.47. No correction has been made for the expected extinction corresponding to
E(B-V) of 0.039.
------- notes for trigger 1423875 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251214d17h10m55s514092usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1423875
-expid=787395838 -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/1423875/
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 787395838.37514 or about 2025:349:09:03:53 UT
Found 258 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 55 sources in
srclist catalog. Found 20 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 2 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 20.28 mag. Found 27 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 4% of the
Genie image region. The Genie image is INCOMPLETE with 17492 null pixels.
The closest Genie source has ra= 330.2171 dec= -9.1872 mag=13.72 sep=90.35".
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?
787395838 63 WHITE 330.21052 -9.16296 17.47/19.2 0.7 srclist Yes
787395838 63 WHITE image found no candidates.
List afterglow candidates for other finding charts.
787396051 276 ? srclist data are not available.
787396051 276 U image found no candidates.
787396652 877 WHITE 330.21059 -9.16307 18.89/19.2 0.7 srclist Yes
787396652 877 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -9.16296
GRB_ERROR: 1.10
GRB_RA: 330.21052
IMAGE_START_TIME: 09:03:53
MAGNITUDE: 17.47
MAG_ERROR: 0.4
MESSAGE_TYPE: ACK
SOURCE: XRT