image overlap message for exposure 2 of trigger 1444088
uvot_overlap.pl vrs. 2010-12-20b fem started at 260127d21h37m37s957231usUT
The observation of trigger 1444088 started 2026-01-27T18:05:39.9
Examining file ./1444088_g904_uvot_sky_image.fits
The exposure ID is 791229939
The exposure time is 149.857 (seconds)
The filter is WHITE.
*** Warning -- found 1334 null pixels in the image.
The uvot region is centered at (231.8861,6.7609) with a roll angle of 109.8
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 (231.8570,6.7580) with a radius of 3.000 arc min
This is 1.745 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 6.72 sq. arc min or 0.24 of the BAT error circle
The XRT error circle is centered at (231.8794,6.7621) with a radius of 0.035 arc min
This is 0.410 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 2 of trigger 1444088
find_uvot_ag.pl vrs. 2023-04-25a fem started at 260127d21h37m49s736399usUT
Observation start time is 2026-01-27T18:05:39.9
Examining file ./1444088_g904_uvot_catalog_image.fits
The exposure ID is 791229939
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 3 detected source(s) for 1444088_g904
Aspect correction adds 0.00067 degrees (0.160 sec of time = 2.38 arc sec) to RA
Aspect correction adds -0.00156 degrees (-5.61 arcsec) to Dec
Total aspect correction is 6.09 arcsec
Star catalogs centered at 231.8881 , 6.7581 with radius 2.15 arc min.
n_usno: 44 n_gsc: 36
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 3 matched entries is 0.354" for 1444088_g904
Mean and std. dev of mag. difference (MAG_DELTA) are 0.914 and 0.356 for 1444088_g904
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1444088_g904.
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=231.8570 (15:27:25.68) DEC= 6.7580 (+06:45:28.8)
XRT distances are from RA=231.8794 (15:27:31.05) DEC= 6.7621 (+06:45:43.7)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 84629.891 counts in the bkg source region of 6209.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 13.630 counts/pixel (5-sig UL in 4" is 19.93 mag) for 1444088_g904
There are 2841.3279 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 14.136 counts/pixel for 1444088_g904
There are 16066.615 counts in the xrt_bkg source region of 1177.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 13.650 counts/pixel (5-sig UL in 4" is 19.93 mag) for 1444088_g904
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 20.49, 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: 1444088_791229939_260127d21h37m49s736399usUT_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(231.8861,6.7609,45")
fk5;-circle(231.879514857397,6.76877045817879,6")
Region file: 1444088_791229939_260127d21h37m49s736399usUT_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(231.87937,6.76214,8")
Region file: 1444088_791229939_260127d21h37m49s736399usUT_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(231.87937,6.76214,25")
fk5;-circle(231.87937,6.76214,15")
fk5;-circle(231.879514857397,6.76877045817879,6")
image paragraph message for exposure 2 of trigger 1444088
IMAGE PROBLEM: damaged image (negative pixel value)
------ Start for Possible Stand-alone Circular ----
In response to GRB260127 (Swift/BAT trigger 1444088) at 17:50:34 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 867 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image processing
FAILED because of damaged image (negative pixel value). The 8'x8' region for
the list of sources generated on-board covers 100% of the XRT error circle. The
list of sources is typically complete to about 18 mag. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.048.
------- notes for trigger 1444088 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 260127d21h37m54s595747usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1444088
-expid=791229939 -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/1444088/
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 -4.135825.
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 791229939.93976 or about 0000:11715:18:05:43 UT
Found 826 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 124 sources in
srclist catalog. Found 72 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 3 source(s) in Genie image catalog. Found 0 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.49 mag. Found 40 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 6% of the
Genie image region. The Genie image is INCOMPLETE with 1334 null pixels.
The closest srclist source has ra= 231.8796 dec= 6.7688 mag=16.23 sep=24.05".
The closest Genie source has ra= 231.8795 dec= 6.7688 mag=15.82 sep=23.88".
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?
791229939 867 WHITE srclist found no candidates.
791229939 867 WHITE image found no candidates.
List afterglow candidates for other finding charts.
791229285 213 WHITE srclist found no candidates.
791229285 213 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: 6.76214
GRB_ERROR: 5.25
GRB_RA: 231.87937
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT