image overlap message for exposure 2 of trigger 921722
uvot_overlap.pl vrs. 2010-12-20b fem started at 190821d22h40m33s118767usUT
The observation of trigger 921722 started 2019-08-21T17:15:29.2
Examining file ./921722_g325_uvot_sky_image.fits
The exposure ID is 588100529
The exposure time is 126.706 (seconds)
The filter is U.
The uvot region is centered at (250.0509,-34.0095) with a roll angle of 274.9
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 (250.0770,-34.0220) with a radius of 3.000 arc min
This is 1.498 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 7.11 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (250.0548,-34.0071) with a radius of 0.027 arc min
This is 0.242 arc min from the center of the uvot region
The area of the XRT error circle is 0.002 sq. arc min
The UVOT/XRT overlap is 0.002 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 921722
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190821d22h40m49s260965usUT
Observation start time is 2019-08-21T17:15:29.2
Examining file ./921722_g325_uvot_catalog_image.fits
The exposure ID is 588100529
The exposure is 126.706 sec.
The bin size is 2 pixels
The filter is U
There are 28 detected source(s) for 921722_g325
Aspect correction adds -0.00014 degrees (-0.033 sec of time = -0.41 arc sec) to RA
Aspect correction adds 0.00008 degrees ( 0.31 arcsec) to Dec
Total aspect correction is 0.51 arcsec
Star catalogs centered at 250.0523 , -34.0100 with radius 2.71 arc min.
n_usno: 535 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.94
RA DEC Mag Color
bright star 0: 250.01719 (16:40:04.13) -34.01864 (-34:01:07.1) 11.94 USNO-R
Mean distance difference (CAT_DELTA) for 25 matched entries is 0.822" for 921722_g325
Mean and std. dev of mag. difference (MAG_DELTA) are 2.682 and 0.824 for 921722_g325
Found 4 entries without IDs and 4 entries that are acceptable afterglow candidates for 921722_g325.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=250.0770 (16:40:18.48) DEC=-34.0220 (-34:01:19.2)
XRT distances are from RA=250.0548 (16:40:13.15) DEC=-34.0071 (-34:00:25.6)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 921722_g325 with genie
ra=250.05191 (16:40:12.46) dec=-34.00722 (-34:00:26.0) +/- 0.7" mag=18.39+/-0.19
dist=8.6 REFID=12 major=1.1 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 91.8 arc sec from the BAT position.
Found 13 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
250.0489 -34.0111 16.7 -1 USNO-B1 19.09 18.88 18.97
250.0523 -34.0069 1.8 -1 USNO-B1 17.34 15.71 16.44 *
250.0548 -34.0076 8.7 -1 USNO-B1 99.99 17.80 99.99
250.0550 -34.0077 9.4 -1 USNO-B1 99.99 17.84 99.99
250.0527 -34.0067 3.0 -1 USNO-B1 99.99 16.92 99.99 *
250.0481 -34.0111 18.1 -1 USNO-B1 99.99 20.40 99.99
250.0526 -34.0058 5.5 -1 USNO-B1 18.03 17.29 17.62
250.0477 -34.0076 12.6 -1 USNO-B1 17.19 15.45 16.22
250.0466 -34.0095 17.8 -1 USNO-B1 18.67 17.16 17.83
250.0495 -34.0052 10.2 -1 USNO-B1 99.99 17.64 99.99
250.0574 -34.0061 16.7 -1 USNO-B1 17.87 17.77 17.81
250.0543 -34.0041 13.2 -1 USNO-B1 99.99 18.46 99.99
250.0488 -34.0030 17.7 -1 USNO-B1 99.99 18.59 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 1 in the list of sources is a candidate afterglow for 921722_g325 with genie
ra=250.06531 (16:40:15.67) dec=-34.00982 (-34:00:35.4) +/- 0.9" mag=19.20+/-0.25
dist=32.9 REFID=14 major=0.8 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 56.0 arc sec from the BAT position.
Found 14 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
250.0601 -34.0068 19.0 -1 USNO-B1 99.99 20.67 99.99
250.0605 -34.0069 17.8 -1 USNO-B1 99.99 25.06 99.99
250.0613 -34.0089 12.5 -1 USNO-B1 18.33 16.88 17.52
250.0617 -34.0113 12.0 -1 USNO-B1 17.95 17.83 17.88
250.0617 -34.0073 14.0 -1 USNO-B1 99.99 18.09 99.99
250.0625 -34.0147 19.6 -1 USNO-B1 17.35 16.07 16.64
250.0649 -34.0080 6.5 -1 USNO-B1 17.51 15.24 16.25
250.0652 -34.0094 1.4 -1 USNO-B1 17.01 15.39 16.11 *
250.0651 -34.0082 5.8 -1 USNO-B1 99.99 15.83 99.99
250.0660 -34.0093 2.9 -1 USNO-B1 99.99 15.93 99.99 *
250.0663 -34.0071 10.3 -1 USNO-B1 99.99 17.36 99.99
250.0664 -34.0131 12.3 -1 USNO-B1 18.08 16.68 17.30
250.0673 -34.0077 9.8 -1 USNO-B1 18.21 19.59 18.98
250.0678 -34.0100 7.4 -1 USNO-B1 99.99 18.63 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 14 in the list of sources is a candidate afterglow for 921722_g325 with genie
ra=250.08026 (16:40:19.26) dec=-34.00949 (-34:00:34.2) +/- 1.2" mag=19.93+/-0.38
dist=76.5 REFID=13 major=0.8 minor=0.6 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 46.1 arc sec from the BAT position.
This source is near the edge of image (0.902)
Found 10 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
250.0745 -34.0111 18.0 -1 USNO-B1 16.69 15.17 15.84
250.0752 -34.0077 16.3 -1 USNO-B1 17.96 17.44 17.67
250.0784 -34.0132 14.3 -1 USNO-B1 16.28 14.16 15.10
250.0784 -34.0145 18.9 -1 USNO-B1 18.52 16.98 17.66
250.0798 -34.0149 19.4 -1 USNO-B1 99.99 17.68 99.99
250.0805 -34.0093 1.1 -1 USNO-B1 17.42 16.50 16.91 *
250.0801 -34.0056 14.2 -1 USNO-B1 99.99 16.91 99.99
250.0820 -34.0065 11.8 -1 USNO-B1 15.69 13.53 14.49
250.0826 -34.0085 7.8 -1 USNO-B1 17.66 17.45 17.54
250.0868 -34.0094 19.6 -1 USNO-B1 15.98 14.09 14.93
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
-----------------
Entry 26 in the list of sources is a candidate afterglow for 921722_g325 with genie
ra=250.05883 (16:40:14.12) dec=-34.03593 (-34:02:09.4) +/- 0.6" mag=15.93+/-0.14
dist=104.5 REFID=1 major=1.0 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 73.9 arc sec from the BAT position.
This source is near the edge of image (0.885)
Found 7 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
250.0572 -34.0308 19.2 -1 USNO-B1 16.85 14.83 15.73
250.0575 -34.0318 15.5 -1 USNO-B1 17.45 18.95 18.28
250.0595 -34.0324 13.0 -1 USNO-B1 18.11 17.87 17.98
250.0589 -34.0354 1.9 -1 USNO-B1 15.54 13.84 14.59 *
250.0552 -34.0359 10.9 -1 USNO-B1 99.99 16.57 99.99
250.0603 -34.0383 9.8 -1 USNO-B1 17.23 16.68 16.92
250.0577 -34.0396 13.5 -1 USNO-B1 16.13 13.84 14.85
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 6 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
250.0523 -34.0069 7.4 -1 USNO-B1 17.34 15.71 16.44
250.0548 -34.0076 1.7 -1 USNO-B1 99.99 17.80 99.99
250.0550 -34.0077 2.1 -1 USNO-B1 99.99 17.84 99.99
250.0527 -34.0067 6.5 -1 USNO-B1 99.99 16.92 99.99
250.0526 -34.0058 8.0 -1 USNO-B1 18.03 17.29 17.62
250.0574 -34.0061 8.5 -1 USNO-B1 17.87 17.77 17.81
The closest star is 1.71" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=250.05191 (16:40:12.46) dec=-34.00722 (-34:00:26.0) +/- 0.7" mag=18.39+/-0.19 dist=8.6 REFID=12 flag=0
There are 15755.421 counts in the bkg source region of 5998.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.627 counts/pixel (5-sig UL in 4" is 19.20 mag) for 921722_g325
There are 605.40253 counts in the xrt source region of 202.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.997 counts/pixel for 921722_g325
There are 3221.8989 counts in the xrt_bkg source region of 1248.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.582 counts/pixel (5-sig UL in 4" is 19.21 mag) for 921722_g325
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 19.76, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 921722_588100529_190821d22h40m49s260965usUT_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(250.0509,-34.0095,45")
fk5;-circle(250.051909374318,-34.0072214290024,6")
fk5;-circle(250.065306429242,-34.009822576282,6")
fk5;-circle(250.040713184219,-33.9988013043195,6")
fk5;-circle(250.041292458604,-34.0165509588281,6")
Region file: 921722_588100529_190821d22h40m49s260965usUT_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(250.05479,-34.00711,8")
Region file: 921722_588100529_190821d22h40m49s260965usUT_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(250.05479,-34.00711,25")
fk5;-circle(250.05479,-34.00711,15")
image paragraph message for exposure 2 of trigger 921722
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: high density of stars
SRCLIST PROBLEM: high density of stars
See notes for more details.
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 GRB190821 (Swift/BAT trigger 921722) at 17:10:03 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 127 seconds with the U filter starting
301 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. Because of the density of catalogued stars, further analysis
is required to report an upper limit for any afterglow in the sub-image. The
8'x8' region for the list of sources generated on-board covers 100% of the XRT
error circle. Because of the density of catalogued stars, further analysis is
required to report an upper limit for any afterglow in the region. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.53.
------- notes for trigger 921722 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190821d22h40m52s265329usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=921722
-expid=588100529 -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/921722/
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 588100529.24794 or about 2019:233:17:15:24 UT
Found 2932 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 57% of the srclist region. Found 91 sources in
srclist catalog. Found 15 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.75 mag.
Found 28 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 4 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
19.76 mag. Found 531 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 50% of the Genie image region.
Genie image analysis:
Found 15755.4 counts in the large background region of 5998.0 pixels or a rate
of 2.627 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 19.25 mag. for a
4-arcsec aperture.
Found 605.4 counts in the XRT position region of 202.0 pixels or a rate of
2.997 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.661 +/- 0.207 (1-sigma) cps or
18.83 mag and a range from 18.53 to 19.24 mag. The 3-sigma UL at the XRT
position is 1.281 cps or 18.11 mag. The closest srclist source has ra= 250.0652
dec= -33.9979 mag=18.96 sep=45.34".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 250.0519 dec= -34.0072 mag=18.39 sep=8.61". The closest Genie
source has ra= 250.0519 dec= -34.0072 mag=18.39 sep=8.61".
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 127 seconds with the U filter starting
301 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 16:40:12.46 = 250.05191
DEC(J2000) = -34:00:26.0 = -34.00722
with a 90%-confidence error radius of about 0.71 arc sec. This position is 8.61
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.39 with a 1-sigma error of about 0.19. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.53.
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?
588100529 301 U srclist found no candidates.
588100529 301 U image found no candidates.
List afterglow candidates for other finding charts.
588100315 87 WHITE srclist found no candidates.
588100315 87 WHITE image found no candidates.
------- Tokens for Quick GCN -------