srclist overlap message for exposure 2 of trigger 945344
uvot_overlap.pl vrs. 2010-12-20b fem started at 191220d21h45m58s087028usUT
The observation of trigger 945344 started 2019-12-20T13:44:34.8
Examining file ./945344_g896_uvot_sky_srclist.fits
The exposure ID is 598542274
The exposure time is undefined.
The filter is U.
The uvot region is centered at (281.3816,26.6548) with a roll angle of 195.4
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 (281.3910,26.6670) with a radius of 3.000 arc min
This is 0.889 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 (281.3798,26.6559) with a radius of 0.038 arc min
This is 0.118 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 945344
find_uvot_ag.pl vrs. 2017-02-17 fem started at 191220d21h46m10s582779usUT
Observation start time is 2019-12-20T13:44:34.8
Examining file ./945344_g896_uvot_catalog_srclist.fits
The exposure ID is 598542274
The exposure is 149.835 sec.
The bin size is 2 pixels
The filter is U
There are 190 detected source(s) for 945344_g896
*** WARNING -- the sources have filled the available telemetry buffer (190).
srclist_overlap returned: bat_overlap 0.436
srclist_overlap returned: xrt_overlap 0.000
Dimmest detected source in 945344_g896 has mag 18.65
Aspect correction adds 0.00040 degrees (0.097 sec of time = 1.30 arc sec) to RA
Aspect correction adds -0.00100 degrees (-3.60 arcsec) to Dec
Total aspect correction is 3.83 arcsec
Star catalogs centered at 281.4257 , 26.6274 with radius 7.10 arc min.
n_usno: 1559 n_gsc: 0
*** WARNING -- bright star catalog has 6 entries brighter than 12 mag
The brightest has mag 4.89868
RA DEC Mag Color
bright star 0: 281.37255 (18:45:29.41) 26.62269 (+26:37:21.7) 11.96 USNO-V
bright star 1: 281.36478 (18:45:27.55) 26.59397 (+26:35:38.3) 11.18 USNO-V
bright star 2: 281.47390 (18:45:53.74) 26.69547 (+26:41:43.7) 11.71 USNO-V
bright star 3: 281.51867 (18:46:04.48) 26.66213 (+26:39:43.7) 4.90 USNO-V
bright star 4: 281.52594 (18:46:06.22) 26.69546 (+26:41:43.7) 10.46 USNO-V
bright star 5: 281.42930 (18:45:43.03) 26.74137 (+26:44:28.9) 12.00 USNO-V
Mean distance difference (CAT_DELTA) for 61 matched entries is 0.690" for 945344_g896
Mean and std. dev of mag. difference (MAG_DELTA) are 2.076 and 0.665 for 945344_g896
Found 129 entries without IDs and 0 entries that are acceptable afterglow candidates for 945344_g896.
Acceptable entries have no ID, XRT distances < 5.75", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
86 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=281.3910 (18:45:33.84) DEC=26.6670 (+26:40:01.2)
XRT distances are from RA=281.3798 (18:45:31.15) DEC=26.6559 (+26:39:21.2)
*** WARNING 67 per cent of entries have no IDs.
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 18:
ra=281.37162 dec= 26.59661 +/- 1.1" mag=18.04+/-0.35 dist=215.0 REFID=145
Found 2 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
281.3814 26.6566 5.8 -1 USNO-B1 21.19 19.25 20.11
281.3774 26.6563 8.0 -1 USNO-B1 17.70 16.15 16.84
The closest star is 5.83" 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 17.84, XRT distances < 5.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 945344
SRCLIST PROBLEM: srclist filled telemetry buffer
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 GRB191220 (Swift/BAT trigger 945344) at 13:29:37 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the U filter starting
872 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 0.00% of the XRT
error circle. No correction has been made for the expected extinction
corresponding to E(B-V) of 0.14.
------- notes for trigger 945344 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 191220d21h46m14s480436usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=945344
-expid=598542274 -meonly -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/945344/
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 598542274.81742 or about 2019:354:13:44:29 UT
Found 1555 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 21% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 129 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 17.84 mag.
Found 26 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
19.97 mag. Found 244 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 25% of the Genie image region.
Genie image analysis:
Found 13918.4 counts in the large background region of 5589.0 pixels or a rate
of 2.490 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 19.45 mag. for a
4-arcsec aperture.
Found 545.2 counts in the XRT position region of 199.0 pixels or a rate of
2.740 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.339 +/- 0.168 (1-sigma) cps or
19.56 mag and a range from 19.12 to 20.30 mag. The 3-sigma UL at the XRT
position is 0.841 cps or 18.57 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.65 mag. The closest
srclist source has ra= 281.3849 dec= 26.6496 mag=17.21 sep=27.82".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 281.3774 dec= 26.6564 mag=18.45 sep=8.00". The closest Genie
source has ra= 281.3774 dec= 26.6564 mag=18.45 sep=8.00".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the image data with mag < 19.41 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=281.38677
(18:45:32.82), DEC=26.66016 (+26:39:36.6) (J2000). It has a mag of 16.93. It is
28.1" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 150 seconds with the U filter starting
872 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:45:32.82 = 281.38677
DEC(J2000) = +26:39:36.6 = 26.66016
with a 90%-confidence error radius of about 0.63 arc sec. The estimated
magnitude is 16.93 with a 1-sigma error of about 0.15. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.14.
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 150 seconds with the U filter starting
872 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:45:30.57 = 281.37738
DEC(J2000) = +26:39:23.1 = 26.65643
with a 90%-confidence error radius of about 0.70 arc sec. This position is 8.00
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.45 with a 1-sigma error of about 0.18. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.14.
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?
598542274 872 U srclist found no candidates.
598542274 872 U image found no candidates.
List afterglow candidates for other finding charts.
598541539 137 U srclist found no candidates.
598541539 137 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 26.65589
GRB_ERROR: 5.75
GRB_RA: 281.37979
IMAGE_START_TIME: 13:44:29
MAGNITUDE: 18.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT