image overlap message for exposure 3 of trigger 1423875
uvot_overlap.pl vrs. 2010-12-20b fem started at 251214d17h10m48s747288usUT
The observation of trigger 1423875 started 2025-12-14T09:17:32.8
Examining file ./1423875_g914_uvot_sky_image.fits
The exposure ID is 787396652
The exposure time is 149.857 (seconds)
The filter is WHITE.
*** Warning -- found 6193 null pixels in the image.
The uvot region is centered at (330.2105,-9.1707) 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 0.445 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 (330.2107,-9.1629) with a radius of 0.035 arc min
This is 0.469 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 3 of trigger 1423875
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251214d17h11m08s420585usUT
Observation start time is 2025-12-14T09:17:32.8
Examining file ./1423875_g914_uvot_catalog_image.fits
The exposure ID is 787396652
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 1 detected source(s) for 1423875_g914
Aspect correction adds -0.00095 degrees (-0.227 sec of time = -3.36 arc sec) to RA
Aspect correction adds -0.00045 degrees (-1.62 arcsec) to Dec
Total aspect correction is 3.73 arcsec
Star catalogs centered at 330.2130 , -9.1530 with radius 2.00 arc min.
n_usno: 29 n_gsc: 30
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 0 matched entries is 0.000" for 1423875_g914
Mean and std. dev of mag. difference (MAG_DELTA) are 0.000 and -1.000 for 1423875_g914
Found 1 entries without IDs and 0 entries that are acceptable afterglow candidates for 1423875_g914.
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 100 per cent of entries have no IDs.
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 0:
ra=330.21292 dec= -9.14863 +/- 1.1" mag=13.32+/-0.35 dist=52.0 REFID=1 flag=24
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are -1.2625669E+06 counts in the bkg source region of 6239.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is -202.367 counts/pixel for 1423875_g914
There are 4326.0229 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 21.849 counts/pixel for 1423875_g914
There are -7.6244938E+05 counts in the xrt_bkg source region of 931.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is -818.957 counts/pixel for 1423875_g914
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 19.42, 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_787396652_251214d17h11m08s420585usUT_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(330.2105,-9.1707,45")
Region file: 1423875_787396652_251214d17h11m08s420585usUT_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_787396652_251214d17h11m08s420585usUT_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 3 of trigger 1423875
IMAGE PROBLEM: damaged image (negative pixel value),
------ 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 878 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 22:00:50.54 = 330.21059
DEC(J2000) = -09:09:47.1 = -9.16307
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
18.89. 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 251214d17h11m12s932697usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1423875
-expid=787396652 -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/
The Genie image appears to be DAMAGED with a min. value of -5739.382812.
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 787396652.7811 or about 2025:349:09:17:27 UT
Found 479 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 118 sources in
srclist catalog. Found 47 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 1 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 19.42 mag. Found 30 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 5% of the
Genie image region. The Genie image is INCOMPLETE with 6193 null pixels.
The closest Genie source has ra= 330.2129 dec= -9.1486 mag=13.32 sep=52.04".
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?
787396652 877 WHITE 330.21059 -9.16307 18.89/19.2 0.7 srclist Yes
787396652 877 WHITE image found no candidates.
List afterglow candidates for other finding charts.
787395838 63 WHITE 330.21052 -9.16296 17.47/19.2 0.7 srclist Yes
787395838 63 WHITE image found no candidates.
787396051 276 ? srclist data are not available.
787396051 276 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -9.16307
GRB_ERROR: 1.10
GRB_RA: 330.21059
IMAGE_START_TIME: 09:17:27
MAGNITUDE: 18.89
MAG_ERROR: 0.4
MESSAGE_TYPE: ACK
SOURCE: XRT