srclist overlap message for exposure 1 of trigger 1073821
uvot_overlap.pl vrs. 2010-12-20b fem started at 210918d08h05m53s903408usUT
The observation of trigger 1073821 started 2021-09-18T08:01:01.8
Examining file 1073821_g160_uvot_sky_srclist.fits
The exposure ID is 653644861
The exposure time is undefined.
The filter is U.
The uvot region is centered at (250.4475,-45.5394) with a roll angle of 282.4
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (250.4550,-45.5400) with a radius of 3.000 arc min
This is 0.318 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 28.27 sq. arc min or 1.00 of the BAT error circle
The XRT error circle is centered at (250.4669,-45.5421) with a radius of 0.082 arc min
This is 0.832 arc min from the center of the uvot region
The area of the XRT error circle is 0.021 sq. arc min
The UVOT/XRT overlap is 0.021 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 1 of trigger 1073821
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210918d08h06m06s730670usUT
Observation start time is 2021-09-18T08:01:01.8
Examining file 1073821_g160_uvot_catalog_srclist.fits
The exposure ID is 653644861
The exposure is 250.000 sec.
The bin size is 2 pixels
The filter is U
There are 189 detected source(s) for 1073821_g160
Aspect correction adds -0.00034 degrees (-0.081 sec of time = -0.85 arc sec) to RA
Aspect correction adds 0.00223 degrees ( 8.03 arcsec) to Dec
Total aspect correction is 8.07 arcsec
Star catalogs centered at 250.4445 , -45.5500 with radius 8.52 arc min.
n_usno: 3388 n_gsc: 0
*** WARNING -- bright star catalog has 6 entries brighter than 12 mag
The brightest has mag 9.64176
RA DEC Mag Color
bright star 0: 250.34673 (16:41:23.22) -45.54411 (-45:32:38.8) 9.64 USNO-V
bright star 1: 250.42010 (16:41:40.82) -45.63306 (-45:37:59.0) 10.68 USNO-V
bright star 2: 250.41636 (16:41:39.93) -45.63808 (-45:38:17.1) 10.08 USNO-V
bright star 3: 250.54158 (16:42:09.98) -45.48754 (-45:29:15.1) 11.95 USNO-V
bright star 4: 250.58052 (16:42:19.32) -45.49007 (-45:29:24.2) 11.69 USNO-V
bright star 5: 250.52150 (16:42:05.16) -45.44386 (-45:26:37.9) 11.59 USNO-V
Mean distance difference (CAT_DELTA) for 100 matched entries is 0.913" for 1073821_g160
Mean and std. dev of mag. difference (MAG_DELTA) are 2.410 and 0.841 for 1073821_g160
Found 90 entries without IDs and 5 entries that are acceptable afterglow candidates for 1073821_g160.
Acceptable entries have no ID, XRT distances < 12.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
67 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=250.4550 (16:41:49.20) DEC=-45.5400 (-45:32:24.0)
XRT distances are from RA=250.4669 (16:41:52.06) DEC=-45.5421 (-45:32:31.6)
*** WARNING 47 per cent of entries have no IDs.
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1073821_g160 with 3x3 stamp
ra=250.44584 (16:41:47.00) dec=-45.56324 (-45:33:47.7) +/- 1.1" mag=18.09+/-0.35
dist=92.8 REFID=91
*** The position of this source is inconsistent with the XRT position.
The position is 86.8 arc sec from the BAT position.
src: 2 distr. of nearby unmatched sources: 0 0 0 0 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
250.4451 -45.5639 2.9 -1 USNO-B1 15.51 13.00 14.11 *
250.4473 -45.5686 19.7 -1 USNO-B1 19.67 19.01 19.30
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 4 in the list of sources is a candidate afterglow for 1073821_g160 with 3x3 stamp
ra=250.49925 (16:41:59.82) dec=-45.52365 (-45:31:25.1) +/- 1.1" mag=18.42+/-0.35
dist=105.2 REFID=86
*** The position of this source is inconsistent with the XRT position.
The position is 126.2 arc sec from the BAT position.
src: 4 distr. of nearby unmatched sources: 0 0 0 0 0
Found 4 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
250.5010 -45.5279 16.0 -1 USNO-B1 19.57 18.70 19.09
250.4992 -45.5231 2.1 -1 USNO-B1 16.33 14.79 15.47 *
250.5003 -45.5215 8.1 -1 USNO-B1 18.56 16.86 17.61
250.4985 -45.5182 19.6 -1 USNO-B1 18.81 17.87 18.29
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 7 in the list of sources is a candidate afterglow for 1073821_g160 with 1x1 stamp
ra=250.42374 (16:41:41.70) dec=-45.53189 (-45:31:54.8) +/- 1.1" mag=18.30+/-0.35
dist=114.9 REFID=173
*** The position of this source is inconsistent with the XRT position.
The position is 84.1 arc sec from the BAT position.
src: 7 distr. of nearby unmatched sources: 0 0 0 0 0
Found 5 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
250.4296 -45.5339 16.5 -1 USNO-B1 99.99 17.97 99.99
250.4251 -45.5336 7.0 -1 USNO-B1 20.22 17.34 18.62
250.4207 -45.5358 15.9 -1 USNO-B1 19.66 17.13 18.26
250.4241 -45.5310 3.3 -1 USNO-B1 17.26 14.78 15.88 *
250.4202 -45.5296 12.3 -1 USNO-B1 19.74 16.27 17.81
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 27 in the list of sources is a candidate afterglow for 1073821_g160 with 3x3 stamp
ra=250.48627 (16:41:56.70) dec=-45.49599 (-45:29:45.6) +/- 1.1" mag=17.44+/-0.35
dist=173.0 REFID=33
*** The position of this source is inconsistent with the XRT position.
The position is 177.0 arc sec from the BAT position.
src: 27 distr. of nearby unmatched sources: 1 0 0 0 0
Found 6 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
250.4931 -45.4984 19.2 -1 USNO-B1 99.99 16.65 99.99
250.4865 -45.4953 2.7 -1 USNO-B1 15.39 13.23 14.19 *
250.4907 -45.4969 11.7 -1 USNO-B1 16.91 15.11 15.91
250.4838 -45.4938 9.9 -1 USNO-B1 18.77 17.87 18.27
250.4822 -45.4926 16.1 -1 USNO-B1 14.25 13.27 13.70
250.4877 -45.4939 8.4 -1 USNO-B1 15.65 14.57 15.05
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 34 in the list of sources is a candidate afterglow for 1073821_g160 with 1x1 stamp
ra=250.44318 (16:41:46.36) dec=-45.59449 (-45:35:40.1) +/- 1.1" mag=17.83+/-0.35
dist=197.8 REFID=137
*** The position of this source is inconsistent with the XRT position.
The position is 198.4 arc sec from the BAT position.
src: 34 distr. of nearby unmatched sources: 0 0 0 0 0
Found 4 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
250.4493 -45.5911 19.7 -1 USNO-B1 19.88 18.34 19.03
250.4375 -45.5912 18.6 -1 USNO-B1 19.46 18.12 18.71
250.4492 -45.5937 15.4 -1 USNO-B1 19.92 18.94 19.37
250.4424 -45.5950 2.8 -1 USNO-B1 16.42 13.62 14.86 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Found 4 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
250.4660 -45.5445 9.1 -1 USNO-B1 19.74 18.16 18.86
250.4652 -45.5412 5.5 -1 USNO-B1 19.68 18.30 18.91
250.4688 -45.5409 6.5 -1 USNO-B1 99.99 18.83 99.99
250.4681 -45.5398 9.0 -1 USNO-B1 19.63 18.66 19.09
The closest star is 5.49" away.
List UVOT sources within 10" of the XRT position:
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 18.12, XRT distances < 12.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: /Home/eud/uvot_tdrss/swift/uvot_gcn/src_1073821_XRT.reg
# Region file format: DS9 version 3.0
# find_uvot_ag.pl vrs. 2020-10-30 fem XRT
global font="helvetica 12 bold" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source=1
fk5;circle(250.4669,-45.5421,4.9") # color=red dash=0
point(250.46656,-45.53987) # point=diamond 10 color=red width=2
srclist paragraph message for exposure 1 of trigger 1073821
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no image afterglow info
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB210918 (Swift/BAT trigger 1073821) at 07:58:20 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of nominal 250.000 seconds with the U filter
starting 133 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. Data from the 2.7'x2.7' sub-image are
not available at this time. The coverage of the XRT error circle by the 8'x8'
region for the list of sources generated on-board is uncertain because the
large number of sources filled the available telemetry. 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 1073821 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210918d08h06m12s551844usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1073821
-expid=653644861 -msg_srclist
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/1073821/
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.
*** Warning -- no exposure found, using srclist assumed value.
XRT position found for srclist. BAT position found.
UVOT exposure began at MET 653644861.8374 or about 2021:261:08:00:56 UT
Found 3384 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 32% of the srclist region. Found 189 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 90 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.12 mag.
The number of srclist sources filled the available telemetry. The weakest
source detected was 18.79 mag. The closest srclist source has ra= 250.4650 dec=
-45.5374 mag=18.05 sep=17.42".
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?
653644861 133 U srclist found no candidates.
653644861 133 ? image data are not available.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------