image overlap message for exposure 3 of trigger 1420873
uvot_overlap.pl vrs. 2010-12-20b fem started at 251206d03h14m10s966360usUT
The observation of trigger 1420873 started 2025-12-05T23:54:43.7
Examining file ./1420873_g895_uvot_sky_image.fits
The exposure ID is 786671683
The exposure time is 9.494 (seconds)
The filter is WHITE.
*** Warning -- no aspect solution was applied to the image.
consequently the calculated overlaps are questionable.
The uvot region is centered at (200.2780,29.9274) with a roll angle of 129.9
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 (200.2430,29.9620) with a radius of 3.000 arc min
This is 2.758 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 3.94 sq. arc min or 0.14 of the BAT error circle
The XRT error circle is centered at (200.2719,29.9289) with a radius of 0.040 arc min
This is 0.327 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 3 of trigger 1420873
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251206d03h14m30s688663usUT
Observation start time is 2025-12-05T23:54:43.7
Examining file ./1420873_g895_uvot_sources_image.fits
The exposure ID is 786671683
The exposure is 9.494 sec.
The bin size is 2 pixels
The filter is WHITE
There are 2 detected source(s) for 1420873_g895
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 200.2801 , 29.9396 with radius 2.00 arc min.
n_usno: 42 n_gsc: 31
Bright star catalog has no entries brighter than 12 mag
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1420873_g895.
Acceptable entries have no ID, XRT distances < 6", 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=200.2430 (13:20:58.32) DEC=29.9620 (+29:57:43.2)
XRT distances are from RA=200.2719 (13:21:05.26) DEC=29.9289 (+29:55:44.2)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1420873_g895 with genie
ra=200.27219 (13:21:05.33) dec=29.93040 (+29:55:49.5) +/- 0.8" mag=16.83+/-0.17
dist=5.3 REFID=1 major=0.9 minor=0.7 flag=0
Found 8 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 12 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
200.2774 29.9333 19.3 -1 USNO-B1 19.92 19.55 19.72
200.2766 29.9331 17.0 -1 USNO-B1 20.83 99.99 99.99
200.2725 29.9308 1.7 -1 USNO-B1 20.79 20.04 20.37 *
200.2721 29.9306 0.7 -1 USNO-B1 20.78 19.56 20.10 *
200.2694 29.9312 9.1 -1 USNO-B1 20.85 19.65 20.18 *
200.2777 29.9330 19.5 -1 GSC2.3 19.44 19.39 99.99
200.2722 29.9305 0.4 -1 GSC2.3 18.56 19.84 99.99 *
200.2695 29.9313 9.1 -1 GSC2.3 19.15 99.99 19.08 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 13.5" or brighter than 12 mag
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1420873_g895 with genie
ra=200.28799 (13:21:09.12) dec=29.94872 (+29:56:55.4) +/- 0.8" mag=14.64+/-0.15
dist=87.1 REFID=2 major=0.8 minor=0.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 148.3 arc sec from the BAT position.
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
200.2881 29.9471 5.9 -1 USNO-B1 14.67 13.04 13.77 *
200.2881 29.9470 6.1 -1 GSC2.3 12.86 14.49 13.35 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 13.5" or brighter than 12 mag
Found 5 entries in star catalog(s) within 20" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
200.2725 29.9308 6.9 -1 USNO-B1 20.79 20.04 20.37
200.2721 29.9306 6.0 -1 USNO-B1 20.78 19.56 20.10
200.2694 29.9312 11.3 -1 USNO-B1 20.85 19.65 20.18
200.2722 29.9305 5.7 -1 GSC2.3 18.56 19.84 99.99
200.2695 29.9313 11.5 -1 GSC2.3 19.15 99.99 19.08
The closest star is 5.70" away.
List UVOT sources within 20" of the XRT position:
Unmatched source ra=200.27219 (13:21:05.33) dec=29.93040 (+29:55:49.5) +/- 0.8" mag=16.83+/-0.17 dist=5.3 REFID=1 flag=0
There are 15523.262 counts in the bkg source region of 6197.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.505 counts/pixel (5-sig UL in 4" is 17.86 mag) for 1420873_g895
There are 600.13538 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.016 counts/pixel for 1420873_g895
There are 3078.5461 counts in the xrt_bkg source region of 1247.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.469 counts/pixel (5-sig UL in 4" is 17.86 mag) for 1420873_g895
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 18.41, XRT distances < 6",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Results are questionable because aspect solution FAILED.
Region file: 1420873_786671683_251206d03h14m30s688663usUT_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(200.2780,29.9274,45")
fk5;-circle(200.272194291977,29.9304044262842,6")
Region file: 1420873_786671683_251206d03h14m30s688663usUT_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(200.27192,29.92894,8")
Region file: 1420873_786671683_251206d03h14m30s688663usUT_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(200.27192,29.92894,25")
fk5;-circle(200.27192,29.92894,15")
image paragraph message for exposure 3 of trigger 1420873
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no aspect solution
SRCLIST PROBLEM: no srclist afterglow info
See notes for more details.
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB251205 (Swift/BAT trigger 1420873) at 23:39:47 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 9 seconds with the White filter
starting 859 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 no aspect solution. Results from the list of sources
generated on-board are not available at this time. No correction has been made
for the expected extinction corresponding to E(B-V) of 0.014.
------- notes for trigger 1420873 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251206d03h14m35s361939usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1420873
-expid=786671683 -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/1420873/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 786671683.68554 or about 2025:340:23:54:38 UT
No information found about the number of stars in the star catalog for srclist
region.
THERE IS NO ASPECT SOLUTION for the image data.
Found 2 source(s) in Genie image catalog. 1 source(s) are within 20.0" of the
xrt position. Found 2 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
18.41 mag. Found 38 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 6% of the Genie image region.
Found 1 Genie source(s) within 20.0" of the XRT position. The brightest such
source has ra= 200.2722 dec= 29.9304 mag=16.83 sep=5.34". The closest Genie
source has ra= 200.2722 dec= 29.9304 mag=16.83 sep=5.34".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 9 seconds with the White filter
starting 859 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 13:21:05.33 = 200.27219
DEC(J2000) = +29:55:49.4 = 29.93040
with a 90%-confidence error radius of about 0.80 arc sec. This position is 5.34
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.83 with a 1-sigma error of about 0.17. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.014.
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?
786671683 858 WHITE srclist data are not available.
786671683 858 WHITE image found no candidates.
List afterglow candidates for other finding charts.
786670973 148 WHITE 200.27250 29.92887 18.17/19.2 1.8 srclist Yes
786670973 148 WHITE 200.27223 29.92888 17.54/20.4 1.0 image Yes
786671130 305 U 200.27224 29.92884 16.96/18.1 1.1 srclist Yes
786671130 305 U 200.27224 29.92872 16.60/19.9 1.3 image Yes
------- Tokens for Quick GCN -------