image overlap message for exposure 1 of trigger 1418729
uvot_overlap.pl vrs. 2010-12-20b fem started at 251201d21h26m55s156036usUT
The observation of trigger 1418729 started 2025-12-01T16:28:48.4
Examining file ./1418729_g137_uvot_sky_image.fits
The exposure ID is 786299328
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (6.3854,-44.2374) with a roll angle of 234.9
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 (6.4090,-44.2370) with a radius of 3.000 arc min
This is 1.016 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 (6.3946,-44.2323) with a radius of 0.063 arc min
This is 0.500 arc min from the center of the uvot region
The area of the XRT error circle is 0.013 sq. arc min
The UVOT/XRT overlap is 0.013 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1418729
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251201d21h26m58s805081usUT
Observation start time is 2025-12-01T16:28:48.4
Examining file ./1418729_g137_uvot_catalog_image.fits
The exposure ID is 786299328
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 6 detected source(s) for 1418729_g137
Aspect correction adds -0.00104 degrees (-0.249 sec of time = -2.68 arc sec) to RA
Aspect correction adds -0.00054 degrees (-1.95 arcsec) to Dec
Total aspect correction is 3.31 arcsec
Star catalogs centered at 6.3895 , -44.2342 with radius 2.40 arc min.
n_usno: 42 n_gsc: 47
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 5 matched entries is 0.596" for 1418729_g137
Mean and std. dev of mag. difference (MAG_DELTA) are 0.700 and 0.312 for 1418729_g137
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1418729_g137.
Acceptable entries have no ID, XRT distances < 9.5", 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= 6.4090 (00:25:38.16) DEC=-44.2370 (-44:14:13.2)
XRT distances are from RA= 6.3946 (00:25:34.71) DEC=-44.2323 (-44:13:56.4)
*** WARNING 33 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1418729_g137 with genie
ra=6.39413 (00:25:34.59) dec=-44.23364 (-44:14:01.1) +/- 0.7" mag=17.28+/-0.14
dist=4.9 REFID=4 major=0.9 minor=0.9 flag=0
Found 1 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
6.3966 -44.2336 6.3 -1 GSC2.3 20.48 22.28 99.99
uvot_check_outside found 12 of 12 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1418729_g137 with genie
ra=6.37475 (00:25:29.94) dec=-44.21601 (-44:12:57.6) +/- 0.8" mag=19.40+/-0.16
dist=78.0 REFID=2 major=1.6 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 116.3 arc sec from the BAT position.
This source is near the edge of image (1.016)
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
6.3748 -44.2153 2.5 -1 USNO-B1 17.99 16.20 16.99 *
6.3747 -44.2153 2.5 -1 GSC2.3 16.26 16.98 99.99 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
Found 1 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
6.3966 -44.2336 6.7 -1 GSC2.3 20.48 22.28 99.99
The closest star is 6.68" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=6.39413 (00:25:34.59) dec=-44.23364 (-44:14:01.1) +/- 0.7" mag=17.28+/-0.14 dist=4.9 REFID=4 flag=0
There are 45337.309 counts in the bkg source region of 6117.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.412 counts/pixel (5-sig UL in 4" is 20.26 mag) for 1418729_g137
There are 2062.7329 counts in the src source region of 52.000000 pixels.
Rate in src region with 4 arcsec radius is 39.668 counts/pixel for 1418729_g137
There are 8972.4873 counts in the cand_src_bkg source region of 1203.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 7.458 counts/pixel (5-sig UL in 4" is 20.26 mag) for 1418729_g137
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 20.82, XRT distances < 9.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1418729_786299328_251201d21h26m58s805081usUT_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(6.3854,-44.2374,45")
fk5;-circle(6.39412885986746,-44.2336397047082,6")
fk5;-circle(6.39331677982929,-44.2265398236813,6")
fk5;-circle(6.37727860898909,-44.2496762950334,6")
Region file: 1418729_786299328_251201d21h26m58s805081usUT_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(6.39412885986746,-44.2336397047082,4")
Region file: 1418729_786299328_251201d21h26m58s805081usUT_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(6.39412885986746,-44.2336397047082,25")
fk5;-circle(6.39412885986746,-44.2336397047082,15")
fk5;-circle(6.39331677982929,-44.2265398236813,6")
image paragraph message for exposure 1 of trigger 1418729
------ Start for Possible Stand-alone Circular ----
In response to GRB251201 (Swift/BAT trigger 1418729) at 16:26:30 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 101 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 00:25:34.59 = 6.39413
DEC(J2000) = -44:14:01.1 = -44.23364
with a 90%-confidence error radius of about 0.75 arc sec. This position is 4.9
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.28 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.008.
------- notes for trigger 1418729 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251201d21h27m06s614644usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1418729
-expid=786299328 -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/1418729/
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 786299328.4083 or about 2025:336:16:28:43 UT
Found 318 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 25 sources in
srclist catalog. Found 3 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 6 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 2 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.82 mag. Found 47 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 5% 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?
786299328 100 WHITE 6.39414 -44.23363 17.60/19.2 4.9 srclist Yes
786299328 100 WHITE 6.39413 -44.23364 17.28/20.8 4.9 image Yes
List afterglow candidates for other finding charts.
786299541 313 U 6.39415 -44.23379 16.97/18.1 2.6 srclist Yes
786299541 313 U 6.39414 -44.23365 16.52/20.6 2.7 image Yes
786300095 867 WHITE 6.39406 -44.23365 17.47/19.2 2.9 srclist Yes
786300095 867 WHITE 6.39413 -44.23361 17.11/20.9 2.5 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -44.23364
GRB_ERROR: 0.75
GRB_RA: 6.39413
IMAGE_START_TIME: 16:28:43
MAGNITUDE: 17.28
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT