image overlap message for exposure 2 of trigger 1280056
uvot_overlap.pl vrs. 2010-12-20b fem started at 250108d12h49m42s037882usUT
The observation of trigger 1280056 started 2025-01-08T10:28:15.9
Examining file ./1280056_g308_uvot_sky_image.fits
The exposure ID is 758024895
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (201.3340,25.6133) with a roll angle of 110.7
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 (201.2970,25.6130) with a radius of 3.000 arc min
This is 2.004 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 6.25 sq. arc min or 0.22 of the BAT error circle
The XRT error circle is centered at (201.3265,25.6152) with a radius of 0.037 arc min
This is 0.421 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 1280056
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250108d12h49m53s101944usUT
Observation start time is 2025-01-08T10:28:15.9
Examining file ./1280056_g308_uvot_catalog_image.fits
The exposure ID is 758024895
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 12 detected source(s) for 1280056_g308
Aspect correction adds 0.00121 degrees (0.290 sec of time = 3.92 arc sec) to RA
Aspect correction adds -0.00132 degrees (-4.75 arcsec) to Dec
Total aspect correction is 6.16 arcsec
Star catalogs centered at 201.3262 , 25.6156 with radius 2.34 arc min.
n_usno: 35 n_gsc: 36
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 3 matched entries is 0.650" for 1280056_g308
Mean and std. dev of mag. difference (MAG_DELTA) are 1.057 and 0.802 for 1280056_g308
Found 9 entries without IDs and 9 entries that are acceptable afterglow candidates for 1280056_g308.
Acceptable entries have no ID, XRT distances < 5.5", 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=201.2970 (13:25:11.28) DEC=25.6130 (+25:36:46.8)
XRT distances are from RA=201.3265 (13:25:18.37) DEC=25.6152 (+25:36:54.7)
*** WARNING 75 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1280056_g308 with genie
ra=201.32585 (13:25:18.20) dec=25.61570 (+25:36:56.5) +/- 1.1" mag=20.28+/-0.29
dist=2.9 REFID=7 major=3.0 minor=1.7 flag=0
Found 2 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
201.3280 25.6202 17.6 -1 USNO-B1 20.83 19.57 20.13
201.3280 25.6202 17.6 -1 GSC2.3 19.09 21.04 99.99
*** unacceptable major profile of 3.0
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1280056_g308 with genie
ra=201.32469 (13:25:17.92) dec=25.61486 (+25:36:53.5) +/- 1.0" mag=20.15+/-0.27
dist=6.1 REFID=8 major=3.2 minor=1.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 90.1 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 3.2
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1280056_g308 with genie
ra=201.32286 (13:25:17.49) dec=25.61399 (+25:36:50.4) +/- 1.3" mag=20.76+/-0.38
dist=12.7 REFID=9 major=1.3 minor=1.3 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 84.0 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1280056_g308 with genie
ra=201.33159 (13:25:19.58) dec=25.61993 (+25:37:11.7) +/- 1.2" mag=20.65+/-0.36
dist=23.7 REFID=6 major=1.5 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 115.0 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
201.3280 25.6202 11.8 -1 USNO-B1 20.83 19.57 20.13
201.3280 25.6202 11.5 -1 GSC2.3 19.09 21.04 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 1.5
-----------------
Entry 4 in the list of sources is a candidate afterglow for 1280056_g308 with genie
ra=201.31871 (13:25:16.49) dec=25.61074 (+25:36:38.7) +/- 1.1" mag=20.36+/-0.30
dist=30.0 REFID=10 major=2.3 minor=1.5 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 70.9 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.3
-----------------
Entry 8 in the list of sources is a candidate afterglow for 1280056_g308 with genie
ra=201.33928 (13:25:21.43) dec=25.62605 (+25:37:33.8) +/- 1.1" mag=20.28+/-0.29
dist=56.9 REFID=4 major=1.7 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 145.1 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 1.7
-----------------
Entry 9 in the list of sources is a candidate afterglow for 1280056_g308 with genie
ra=201.31057 (13:25:14.54) dec=25.60434 (+25:36:15.6) +/- 1.1" mag=20.30+/-0.29
dist=64.9 REFID=11 major=1.0 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 54.0 arc sec from the BAT position.
This source is near the edge of image (1.011)
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
201.3133 25.6041 8.9 -1 USNO-B1 20.38 19.15 19.69
201.3133 25.6040 9.1 -1 GSC2.3 18.78 19.57 18.15
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 10 in the list of sources is a candidate afterglow for 1280056_g308 with genie
ra=201.34225 (13:25:22.14) dec=25.62812 (+25:37:41.2) +/- 1.1" mag=20.43+/-0.31
dist=69.1 REFID=3 major=2.8 minor=1.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 156.7 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.8
-----------------
Entry 11 in the list of sources is a candidate afterglow for 1280056_g308 with genie
ra=201.34484 (13:25:22.76) dec=25.63040 (+25:37:49.4) +/- 1.2" mag=20.65+/-0.36
dist=80.8 REFID=2 major=2.0 minor=0.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 167.4 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.0
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=201.32585 (13:25:18.20) dec=25.61570 (+25:36:56.5) +/- 1.1" mag=20.28+/-0.29 dist=2.9 REFID=7 flag=0
Unmatched source ra=201.32469 (13:25:17.92) dec=25.61486 (+25:36:53.5) +/- 1.0" mag=20.15+/-0.27 dist=6.1 REFID=8 flag=0
There are 12462.495 counts in the bkg source region of 5892.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.115 counts/pixel (5-sig UL in 4" is 20.06 mag) for 1280056_g308
There are 565.90454 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.815 counts/pixel for 1280056_g308
There are 2347.6255 counts in the xrt_bkg source region of 1135.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.068 counts/pixel (5-sig UL in 4" is 20.07 mag) for 1280056_g308
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.61, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1280056_758024895_250108d12h49m53s101944usUT_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(201.3340,25.6133,45")
fk5;-circle(201.325852232053,25.6157004151076,6")
fk5;-circle(201.324685673539,25.6148583306242,6")
fk5;-circle(201.32286313825,25.6139908026469,6")
fk5;-circle(201.331594692366,25.6199264193412,6")
fk5;-circle(201.318708102884,25.610743526591,6")
fk5;-circle(201.332099620515,25.6007246378882,6")
fk5;-circle(201.339284743725,25.6260516067758,6")
Region file: 1280056_758024895_250108d12h49m53s101944usUT_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(201.32654,25.61519,8")
Region file: 1280056_758024895_250108d12h49m53s101944usUT_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(201.32654,25.61519,25")
fk5;-circle(201.32654,25.61519,15")
fk5;-circle(201.32286313825,25.6139908026469,6")
fk5;-circle(201.331594692366,25.6199264193412,6")
fk5;-circle(201.318708102884,25.610743526591,6")
image paragraph message for exposure 2 of trigger 1280056
2 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 GRB250108 (Swift/BAT trigger 1280056) at 10:23:06 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
274 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 expected extinction corresponding to E(B-V) of
0.012.
------- notes for trigger 1280056 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250108d12h49m57s547924usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1280056
-expid=758024895 -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/1280056/
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 758024895.85378 or about 2025:009:10:28:10 UT
Found 420 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 82 sources in
srclist catalog. Found 67 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 12 source(s) in Genie image catalog. 2 source(s) are within 10.0" of the
xrt position. Found 9 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.61 mag. Found 36 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 4% of the Genie image region.
Genie image analysis:
Found 12462.5 counts in the large background region of 5892.0 pixels or a rate
of 2.115 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 19.86 mag. for a
4-arcsec aperture.
Found 565.9 counts in the XRT position region of 201.0 pixels or a rate of
2.815 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.601 +/- 0.101 (1-sigma) cps or
18.69 mag and a range from 18.53 to 18.90 mag. The 3-sigma UL at the XRT
position is 0.904 cps or 18.25 mag. The closest srclist source has ra= 201.3142
dec= 25.6194 mag=16.95 sep=42.70".
Found 2 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 201.3259 dec= 25.6157 mag=20.28 sep=2.89". The closest Genie
source has ra= 201.3259 dec= 25.6157 mag=20.28 sep=2.89".
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
274 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 13:25:18.20 = 201.32585
DEC(J2000) = +25:36:56.5 = 25.61570
with a 90%-confidence error radius of about 1.05 arc sec. This position is 2.89
arc sec. from the center of the XRT error circle. The estimated magnitude is
20.28 with a 1-sigma error of about 0.29. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.012.
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?
758024895 273 U srclist found no candidates.
758024895 273 U image found no candidates.
List afterglow candidates for other finding charts.
758024738 116 WHITE srclist found no candidates.
758024738 116 WHITE image found no candidates.
758025499 877 WHITE srclist found no candidates.
758025499 877 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 25.61519
GRB_ERROR: 5.5
GRB_RA: 201.32654
IMAGE_START_TIME: 10:28:10
MAGNITUDE: 18.2
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT