image overlap message for exposure 2 of trigger 945344
uvot_overlap.pl vrs. 2010-12-20b fem started at 191220d21h45m59s482777usUT
The observation of trigger 945344 started 2019-12-20T13:44:34.8
Examining file ./945344_g896_uvot_sky_image.fits
The exposure ID is 598542274
The exposure time is 149.835 (seconds)
The filter is U.
The uvot region is centered at (281.3822,26.6531) with a roll angle of 195.4
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 (281.3910,26.6670) with a radius of 3.000 arc min
This is 0.961 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 (281.3798,26.6559) with a radius of 0.038 arc min
This is 0.212 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
image afterglow message for exposure 2 of trigger 945344
find_uvot_ag.pl vrs. 2017-02-17 fem started at 191220d21h46m13s088938usUT
Observation start time is 2019-12-20T13:44:34.8
Examining file ./945344_g896_uvot_catalog_image.fits
The exposure ID is 598542274
The exposure is 149.835 sec.
The bin size is 2 pixels
The filter is U
There are 26 detected source(s) for 945344_g896
Aspect correction adds 0.00032 degrees (0.077 sec of time = 1.04 arc sec) to RA
Aspect correction adds -0.00098 degrees (-3.53 arcsec) to Dec
Total aspect correction is 3.68 arcsec
Star catalogs centered at 281.3814 , 26.6565 with radius 2.56 arc min.
n_usno: 248 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.96404
RA DEC Mag Color
bright star 0: 281.37255 (18:45:29.41) 26.62269 (+26:37:21.7) 11.96 USNO-V
Mean distance difference (CAT_DELTA) for 25 matched entries is 0.570" for 945344_g896
Mean and std. dev of mag. difference (MAG_DELTA) are 1.086 and 0.643 for 945344_g896
Found 1 entries without IDs and 1 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.
0 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)
-----------------
Entry 2 in the list of sources is a candidate afterglow for 945344_g896 with genie
ra=281.38677 (18:45:32.82) dec=26.66016 (+26:39:36.6) +/- 0.6" mag=16.93+/-0.15
dist=27.2 REFID=13 major=0.9 minor=0.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 28.1 arc sec from the BAT position.
Found 5 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
281.3864 26.6591 3.9 -1 USNO-B1 14.96 13.88 14.36
281.3889 26.6558 17.2 -1 USNO-B1 19.48 17.57 18.42
281.3897 26.6561 17.3 -1 USNO-B1 19.84 18.49 19.09
281.3838 26.6643 17.8 -1 USNO-B1 16.68 15.52 16.04
281.3881 26.6641 14.7 -1 USNO-B1 20.25 19.26 19.70
*** If XRT position is correct, then this is NOT the afterglow
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:
Matched source ra=281.37738 (18:45:30.57) dec=26.65643 (+26:39:23.1) +/- 0.7" mag=18.45+/-0.18 dist=8.0 REFID=16 flag=0
There are 13918.445 counts in the bkg source region of 5589.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.490 counts/pixel (5-sig UL in 4" is 19.41 mag) for 945344_g896
There are 545.21918 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.740 counts/pixel for 945344_g896
There are 2834.5562 counts in the xrt_bkg source region of 1141.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.484 counts/pixel (5-sig UL in 4" is 19.42 mag) for 945344_g896
There are 1 candidate(s) outside XRT error circle with mag < 19.41
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.97, XRT distances < 5.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 945344_598542274_191220d21h46m13s088938usUT_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(281.3822,26.6531,45")
fk5;-circle(281.377377122002,26.6564270462188,6")
fk5;-circle(281.386165156583,26.6586585116593,6")
fk5;-circle(281.386765500277,26.6601619745074,6")
fk5;-circle(281.383838731308,26.6643840617222,6")
fk5;-circle(281.38466286557,26.6496320606153,6")
fk5;-circle(281.367751247457,26.6551558830119,6")
fk5;-circle(281.393448906238,26.6504858727772,6")
fk5;-circle(281.394888134394,26.6482447767216,6")
fk5;-circle(281.386658388099,26.6404582585943,6")
Region file: 945344_598542274_191220d21h46m13s088938usUT_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(281.37979,26.65589,8")
Region file: 945344_598542274_191220d21h46m13s088938usUT_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(281.37979,26.65589,25")
fk5;-circle(281.37979,26.65589,15")
fk5;-circle(281.386165156583,26.6586585116593,6")
fk5;-circle(281.386765500277,26.6601619745074,6")
fk5;-circle(281.38466286557,26.6496320606153,6")
image 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 191220d21h46m16s537202usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=945344
-expid=598542274 -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/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