image overlap message for exposure 1 of trigger 1442056
uvot_overlap.pl vrs. 2010-12-20b fem started at 260118d11h42m17s939778usUT
The observation of trigger 1442056 started 2026-01-18T11:31:41.0
Examining file 1442056_g225_uvot_sky_image.fits
The exposure ID is 790428700
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (170.2502,-61.9196) with a roll angle of 134.4
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 (170.2300,-61.9090) with a radius of 3.000 arc min
This is 0.854 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 (170.2386,-61.9161) with a radius of 0.085 arc min
This is 0.389 arc min from the center of the uvot region
The area of the XRT error circle is 0.023 sq. arc min
The UVOT/XRT overlap is 0.023 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1442056
find_uvot_ag.pl vrs. 2023-04-25a fem started at 260118d11h42m19s209857usUT
Observation start time is 2026-01-18T11:31:41.0
Examining file 1442056_g225_uvot_catalog_image.fits
The exposure ID is 790428700
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 33 detected source(s) for 1442056_g225
Aspect correction adds 0.00083 degrees (0.199 sec of time = 1.40 arc sec) to RA
Aspect correction adds -0.00041 degrees (-1.49 arcsec) to Dec
Total aspect correction is 2.05 arcsec
Star catalogs centered at 170.2494 , -61.9194 with radius 2.61 arc min.
n_usno: 406 n_gsc: 551
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.1079
RA DEC Mag Color
bright star 0: 170.23847 (11:20:57.23) -61.91621 (-61:54:58.3) 11.85 USNO-V
bright star 1: 170.30284 (11:21:12.68) -61.92093 (-61:55:15.4) 11.11 USNO-V
Mean distance difference (CAT_DELTA) for 32 matched entries is 0.709" for 1442056_g225
Mean and std. dev of mag. difference (MAG_DELTA) are 2.145 and 0.929 for 1442056_g225
Found 3 entries without IDs and 1 entries that are acceptable afterglow candidates for 1442056_g225.
Acceptable entries have no ID, XRT distances < 12.75", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
2 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=170.2300 (11:20:55.20) DEC=-61.9090 (-61:54:32.4)
XRT distances are from RA=170.2386 (11:20:57.26) DEC=-61.9161 (-61:54:58.0)
-----------------
Entry 4 in the list of sources is a candidate afterglow for 1442056_g225 with genie
ra=170.24369 (11:20:58.49) dec=-61.90956 (-61:54:34.4) +/- 0.6" mag=17.34+/-0.15
dist=25.1 REFID=7 major=0.9 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 23.3 arc sec from the BAT position.
Found 17 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
170.2507 -61.9135 18.4 -1 USNO-B1 99.99 16.59 99.99
170.2435 -61.9141 16.2 -1 USNO-B1 15.59 14.26 14.85
170.2389 -61.9122 12.5 -1 USNO-B1 16.09 15.00 15.49
170.2428 -61.9098 1.7 -1 USNO-B1 15.74 14.77 15.20 *
170.2358 -61.9111 14.6 -1 USNO-B1 99.99 18.31 99.99
170.2336 -61.9106 17.4 -1 USNO-B1 16.56 15.86 16.17
170.2325 -61.9085 19.3 -1 USNO-B1 18.87 17.34 18.02
170.2449 -61.9060 13.0 -1 USNO-B1 17.11 15.60 16.27
170.2488 -61.9056 16.7 -1 USNO-B1 17.83 16.98 17.35
170.2479 -61.9055 16.1 -1 USNO-B1 16.86 15.91 16.33
170.2351 -61.9060 19.5 -1 USNO-B1 18.14 17.57 17.83
170.2436 -61.9142 16.6 -1 GSC2.3 15.68 99.99 15.86
170.2387 -61.9120 12.2 -1 GSC2.3 15.65 99.99 16.04
170.2433 -61.9096 0.7 -1 GSC2.3 15.36 99.99 15.63 *
170.2332 -61.9105 18.1 -1 GSC2.3 16.32 99.99 16.92
170.2443 -61.9060 13.0 -1 GSC2.3 16.30 99.99 17.05
170.2477 -61.9053 16.7 -1 GSC2.3 17.11 99.99 17.41
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
Found 2 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
170.2385 -61.9162 0.4 -1 USNO-B1 12.61 11.24 11.85
170.2382 -61.9167 2.3 -1 GSC2.3 11.26 99.99 12.06
The closest star is 0.44" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=170.23848 (11:20:57.23) dec=-61.91674 (-61:55:00.3) +/- 0.6" mag=12.31+/-0.14 dist=2.3 REFID=12 flag=2
There are 28555.807 counts in the bkg source region of 5287.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.401 counts/pixel (5-sig UL in 4" is 19.55 mag) for 1442056_g225
There are 20059.377 counts in the xrt source region of 197.00000 pixels.
Rate in xrt region with 8 arcsec radius is 101.824 counts/pixel for 1442056_g225
There are 5573.0254 counts in the xrt_bkg source region of 885.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 6.297 counts/pixel (5-sig UL in 4" is 19.47 mag) for 1442056_g225
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 20.10, XRT distances < 12.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1442056_790428700_260118d11h42m19s209857usUT_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(170.2502,-61.9196,45")
fk5;-circle(170.238478582244,-61.9167386799387,6")
fk5;-circle(170.238832438793,-61.9121413371349,6")
fk5;-circle(170.250862973539,-61.9151469271334,6")
fk5;-circle(170.233684054582,-61.9106362778407,6")
fk5;-circle(170.243691202313,-61.9095554894845,6")
fk5;-circle(170.226124588416,-61.9192485713349,6")
fk5;-circle(170.249601346029,-61.9261200497718,6")
fk5;-circle(170.250823191092,-61.9287516860892,6")
fk5;-circle(170.268720422888,-61.9259728990187,6")
fk5;-circle(170.275300808548,-61.9118837190591,6")
fk5;-circle(170.2603598073,-61.9306772601667,6")
fk5;-circle(170.278912762078,-61.9236747417968,6")
Region file: 1442056_790428700_260118d11h42m19s209857usUT_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(170.2386,-61.9161,8")
Region file: 1442056_790428700_260118d11h42m19s209857usUT_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(170.2386,-61.9161,25")
fk5;-circle(170.2386,-61.9161,15")
fk5;-circle(170.238832438793,-61.9121413371349,6")
fk5;-circle(170.250862973539,-61.9151469271334,6")
fk5;-circle(170.233684054582,-61.9106362778407,6")
fk5;-circle(170.243691202313,-61.9095554894845,6")
fk5;-circle(170.226124588416,-61.9192485713349,6")
image paragraph message for exposure 1 of trigger 1442056
SRCLIST PROBLEM: srclist filled telemetry buffer
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
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 GRB260118 (Swift/BAT trigger 1442056) at 11:27:54 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
188 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the
XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. 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 18.0 mag. No
correction has been made for the large, but uncertain, extinction expected.
------- notes for trigger 1442056 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 260118d11h42m20s624840usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1442056
-expid=790428700 -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/1442056/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for bat position. Unreliable extinction found for
xrt position. XRT position found for srclist. XRT position found for Genie
image. BAT position found.
UVOT exposure began at MET 790428700.98796 or about 0000:11706:11:31:44 UT
Found 3316 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 39% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 37 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.12 mag.
Found 33 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 3 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.10 mag. Found 402 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 40% of the Genie image region.
Genie image analysis:
Found 28555.8 counts in the large background region of 5287.0 pixels or a rate
of 5.401 counts/pixel in a radius of 45.0 arcsec. Based on this background, the
typical 5-sigma UL at a random point in the Genie image is 19.34 mag. for a
4-arcsec aperture.
Found 20059.4 counts in the XRT position region of 197.0 pixels or a rate of
101.824 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 75.275 +/- 0.570 (1-sigma) cps or
13.44 mag and a range from 13.43 to 13.45 mag. The 3-sigma UL at the XRT
position is 76.987 cps or 13.41 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.52 mag.
Found 6 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 170.2386 dec= -61.9166 mag=13.39 sep=1.80".
The closest srclist source has ra= 170.2386 dec= -61.9166 mag=13.39 sep=1.80".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 170.2385 dec= -61.9167 mag=12.31 sep=2.31". The closest Genie
source has ra= 170.2385 dec= -61.9167 mag=12.31 sep=2.31".
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 250 seconds with the U filter starting
188 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 11:20:57.24 = 170.23848
DEC(J2000) = -61:55:00.3 = -61.91674
with a 90%-confidence error radius of about 0.61 arc sec. This position is 2.31
arc sec. from the center of the XRT error circle. The estimated magnitude is
12.31 with a 1-sigma error of about 0.14. No correction has been made for the
large, but uncertain, extinction expected.
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?
790428700 188 U srclist found no candidates.
790428700 188 U image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -61.91610
GRB_ERROR: 12.75
GRB_RA: 170.23860
MAGNITUDE: 13.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT