image overlap message for exposure 2 of trigger 1101053
uvot_overlap.pl vrs. 2010-12-20b fem started at 220404d07h09m22s215175usUT
The observation of trigger 1101053 started 2022-04-03T20:48:29.1
Examining file ./1101053_g346_uvot_sky_image.fits
The exposure ID is 670711709
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (191.4316,89.1873) with a roll angle of 358.0
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 (191.0250,89.1700) with a radius of 3.000 arc min
This is 1.094 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 (191.4734,89.1846) with a radius of 0.058 arc min
This is 0.165 arc min from the center of the uvot region
The area of the XRT error circle is 0.011 sq. arc min
The UVOT/XRT overlap is 0.011 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1101053
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220404d07h09m32s667482usUT
Observation start time is 2022-04-03T20:48:29.1
Examining file ./1101053_g346_uvot_catalog_image.fits
The exposure ID is 670711709
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 5 detected source(s) for 1101053_g346
Aspect correction adds -0.00461 degrees (-1.108 sec of time = -0.24 arc sec) to RA
Aspect correction adds 0.00152 degrees ( 5.46 arcsec) to Dec
Total aspect correction is 5.46 arcsec
Star catalogs centered at 191.2805 , 89.1859 with radius 2.51 arc min.
n_usno: 81 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 4 matched entries is 0.376" for 1101053_g346
Mean and std. dev of mag. difference (MAG_DELTA) are 0.918 and 0.377 for 1101053_g346
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1101053_g346.
Acceptable entries have no ID, XRT distances < 8.75", 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=191.0250 (12:44:06.00) DEC=89.1700 (+89:10:12.0)
XRT distances are from RA=191.4734 (12:45:53.62) DEC=89.1846 (+89:11:04.6)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1101053_g346 with genie
ra=191.46643 (12:45:51.94) dec=89.18513 (+89:11:06.5) +/- 1.3" mag=20.79+/-0.37
dist=1.9 REFID=5 major=1.3 minor=1.1 flag=0
Found 0 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)
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
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=191.46643 (12:45:51.94) dec=89.18513 (+89:11:06.5) +/- 1.3" mag=20.79+/-0.37 dist=1.9 REFID=5 flag=0
There are 10717.199 counts in the bkg source region of 6195.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.730 counts/pixel (5-sig UL in 4" is 20.17 mag) for 1101053_g346
There are 390.24191 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 1.971 counts/pixel for 1101053_g346
There are 2137.9387 counts in the xrt_bkg source region of 1248.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 1.713 counts/pixel (5-sig UL in 4" is 20.17 mag) for 1101053_g346
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 20.72, XRT distances < 8.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1101053_670711709_220404d07h09m32s667482usUT_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(191.4316,89.1873,45")
fk5;-circle(191.466429908557,89.1851266088617,6")
Region file: 1101053_670711709_220404d07h09m32s667482usUT_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(191.47342,89.18461,8")
Region file: 1101053_670711709_220404d07h09m32s667482usUT_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(191.47342,89.18461,25")
fk5;-circle(191.47342,89.18461,15")
image paragraph message for exposure 2 of trigger 1101053
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 GRB220403 (Swift/BAT trigger 1101053) at 20:42:42 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
317 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
0.208.
------- notes for trigger 1101053 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 220404d07h09m36s385764usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1101053
-expid=670711709 -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/1101053/
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 670711709.0722 or about 2022:093:20:48:24 UT
Found 293 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 34 sources in
srclist catalog. Found 13 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 5 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.72 mag. Found 77 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 8% of the Genie image region.
Genie image analysis:
Found 10717.2 counts in the large background region of 6195.0 pixels or a rate
of 1.730 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 20.00 mag. for a
4-arcsec aperture.
Found 390.2 counts in the XRT position region of 198.0 pixels or a rate of
1.971 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.204 +/- 0.084 (1-sigma) cps or
19.90 mag and a range from 19.53 to 20.48 mag. The 3-sigma UL at the XRT
position is 0.457 cps or 19.03 mag. The closest srclist source has ra= 192.5753
dec= 89.1961 mag=18.82 sep=69.29".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 191.4664 dec= 89.1851 mag=20.79 sep=1.89". The closest Genie
source has ra= 191.4664 dec= 89.1851 mag=20.79 sep=1.89".
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
317 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 12:45:51.94 = 191.46643
DEC(J2000) = +89:11:06.5 = 89.18513
with a 90%-confidence error radius of about 1.28 arc sec. This position is 1.89
arc sec. from the center of the XRT error circle. The estimated magnitude is
20.79 with a 1-sigma error of about 0.37. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.208.
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?
670711709 317 U srclist found no candidates.
670711709 317 U 191.46643 89.18513 20.79/20.7 1.9 image Yes
List afterglow candidates for other finding charts.
670711496 104 WHITE srclist found no candidates.
670711496 104 WHITE 191.47207 89.18518 19.80/20.9 2.0 image Yes
670712265 873 WHITE srclist found no candidates.
670712265 873 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 89.18461
GRB_ERROR: 8.75
GRB_RA: 191.47342
IMAGE_START_TIME: 20:48:24
MAGNITUDE: 19.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT