image overlap message for exposure 2 of trigger 1061223
uvot_overlap.pl vrs. 2010-12-20b fem started at 210722d21h17m23s412636usUT
The observation of trigger 1061223 started 2021-07-22T21:00:17.0
Examining file ./1061223_g334_uvot_sky_image.fits
The exposure ID is 648680417
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (27.0333,-6.3438) with a roll angle of 70.5
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 (27.0230,-6.3540) with a radius of 3.000 arc min
This is 0.867 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 (27.0303,-6.3475) with a radius of 0.032 arc min
This is 0.285 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1061223
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210722d21h17m37s348651usUT
Observation start time is 2021-07-22T21:00:17.0
Examining file ./1061223_g334_uvot_catalog_image.fits
The exposure ID is 648680417
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 2 detected source(s) for 1061223_g334
Aspect correction adds 0.00136 degrees (0.327 sec of time = 4.87 arc sec) to RA
Aspect correction adds -0.00148 degrees (-5.32 arcsec) to Dec
Total aspect correction is 7.22 arcsec
Star catalogs centered at 27.0281 , -6.3385 with radius 2.35 arc min.
n_usno: 44 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 1 matched entries is 0.551" for 1061223_g334
Mean and std. dev of mag. difference (MAG_DELTA) are 1.149 and 0.000 for 1061223_g334
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1061223_g334.
Acceptable entries have no ID, XRT distances < 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=27.0230 (01:48:05.52) DEC=-6.3540 (-06:21:14.4)
XRT distances are from RA=27.0303 (01:48:07.27) DEC=-6.3475 (-06:20:50.9)
*** WARNING 50 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1061223_g334 with genie
ra=27.03038 (01:48:07.29) dec=-6.34728 (-06:20:50.2) +/- 0.7" mag=13.54+/-0.14
dist=0.8 REFID=1 major=1.0 minor=1.0 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 12 of 12 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=27.03038 (01:48:07.29) dec=-6.34728 (-06:20:50.2) +/- 0.7" mag=13.54+/-0.14 dist=0.8 REFID=1 flag=0
There are 21714.934 counts in the bkg source region of 6195.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.505 counts/pixel (5-sig UL in 4" is 19.78 mag) for 1061223_g334
There are 10924.513 counts in the src source region of 52.000000 pixels.
Rate in src region with 4 arcsec radius is 210.087 counts/pixel for 1061223_g334
There are 4784.9961 counts in the cand_src_bkg source region of 1253.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 3.819 counts/pixel (5-sig UL in 4" is 19.74 mag) for 1061223_g334
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 20.34, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1061223_648680417_210722d21h17m37s348651usUT_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(27.0333,-6.3438,45")
fk5;-circle(27.0303794116454,-6.34727691131427,6")
Region file: 1061223_648680417_210722d21h17m37s348651usUT_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(27.0303794116454,-6.34727691131427,4")
Region file: 1061223_648680417_210722d21h17m37s348651usUT_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(27.0303794116454,-6.34727691131427,25")
fk5;-circle(27.0303794116454,-6.34727691131427,15")
image paragraph message for exposure 2 of trigger 1061223
------ Start for Possible Stand-alone Circular ----
In response to GRB210722 (Swift/BAT trigger 1061223) at 20:54:42 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
307 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 01:48:07.29 = 27.03038
DEC(J2000) = -06:20:50.2 = -6.34728
with a 90%-confidence error radius of about 0.74 arc sec. This position is 0.8
arc sec. from the center of the XRT error circle. The estimated magnitude is
13.54 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.027.
------- notes for trigger 1061223 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210722d21h17m49s143203usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1061223
-expid=648680417 -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/1061223/
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 648680417.01354 or about 2021:203:21:00:12 UT
Found 183 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 13 sources in
srclist catalog. Found 2 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 2 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 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.34 mag. Found 40 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?
648680417 307 U 27.03052 -6.34732 14.37/18.1 1.0 srclist Yes
648680417 307 U 27.02999 -6.34847 19.05/18.1 3.8 srclist Yes
648680417 307 U 27.03038 -6.34728 13.54/20.3 0.8 image Yes
List afterglow candidates for other finding charts.
648680203 93 WHITE 27.03033 -6.34715 14.58/19.2 1.2 srclist Yes
648680203 93 WHITE 27.03028 -6.34718 14.37/20.6 1.0 image Yes
648680969 859 WHITE 27.03035 -6.34730 15.46/19.2 0.7 srclist Yes
648680969 859 WHITE 27.03027 -6.34717 14.78/20.3 1.2 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -6.34728
GRB_ERROR: 0.74
GRB_RA: 27.03038
IMAGE_START_TIME: 21:00:12
MAGNITUDE: 13.54
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT