image overlap message for exposure 3 of trigger 887579
uvot_overlap.pl vrs. 2010-12-20b fem started at 190204d13h38m31s649667usUT
The observation of trigger 887579 started 2019-02-04T06:00:57.1
Examining file ./887579_g896_uvot_sky_image.fits
The exposure ID is 570952857
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (351.4757,54.8735) with a roll angle of 213.4
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 (351.5340,54.8830) with a radius of 3.000 arc min
This is 2.090 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 5.78 sq. arc min or 0.20 of the BAT error circle
The XRT error circle is centered at (351.4782,54.8764) with a radius of 0.025 arc min
This is 0.189 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 3 of trigger 887579
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190204d13h39m14s962799usUT
Observation start time is 2019-02-04T06:00:57.1
Examining file ./887579_g896_uvot_catalog_image.fits
The exposure ID is 570952857
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 48 detected source(s) for 887579_g896
Aspect correction adds 0.00008 degrees (0.020 sec of time = 0.17 arc sec) to RA
Aspect correction adds -0.00020 degrees (-0.73 arcsec) to Dec
Total aspect correction is 0.75 arcsec
Star catalogs centered at 351.4748 , 54.8715 with radius 2.73 arc min.
n_usno: 348 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.71
RA DEC Mag Color
bright star 0: 351.47225 (23:25:53.34) 54.88890 (+54:53:20.0) 11.71 USNO-R
Mean distance difference (CAT_DELTA) for 55 matched entries is 0.550" for 887579_g896
Mean and std. dev of mag. difference (MAG_DELTA) are 0.942 and 0.615 for 887579_g896
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 887579_g896.
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=351.5340 (23:26:08.16) DEC=54.8830 (+54:52:58.8)
XRT distances are from RA=351.4782 (23:25:54.77) DEC=54.8764 (+54:52:34.9)
-----------------
Entry 44 in the list of sources is a candidate afterglow for 887579_g896 with genie
ra=351.49619 (23:25:59.09) dec=54.89764 (+54:53:51.5) +/- 0.7" mag=19.20+/-0.16
dist=85.2 REFID=4 major=0.8 minor=0.2 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 94.4 arc sec from the BAT position.
This source is near the edge of image (1.013)
Found 4 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
351.4906 54.8958 13.4 -1 USNO-B1 15.23 13.78 14.43
351.4926 54.8977 7.4 -1 USNO-B1 16.84 15.07 15.86
351.4973 54.8980 2.6 -1 USNO-B1 15.85 14.62 15.17 *
351.5017 54.8982 11.7 -1 USNO-B1 20.27 18.76 19.43
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 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
351.4756 54.8774 6.6 -1 USNO-B1 17.64 16.75 17.15
351.4800 54.8771 4.7 -1 USNO-B1 19.90 18.66 19.21
The closest star is 4.66" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=351.47552 (23:25:54.13) dec=54.87734 (+54:52:38.4) +/- 0.6" mag=17.51+/-0.14 dist=6.6 REFID=24 flag=0
There are 60859.578 counts in the bkg source region of 5349.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 11.378 counts/pixel (5-sig UL in 4" is 20.03 mag) for 887579_g896
There are 3438.2026 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 17.277 counts/pixel for 887579_g896
There are 12979.435 counts in the xrt_bkg source region of 1139.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 11.395 counts/pixel (5-sig UL in 4" is 20.03 mag) for 887579_g896
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 20.58, 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: 887579_570952857_190204d13h39m14s962799usUT_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(351.4757,54.8735,45")
fk5;-circle(351.475524974282,54.8773381886542,6")
fk5;-circle(351.478795424974,54.8718768098311,6")
fk5;-circle(351.49118962738,54.8760951797246,6")
fk5;-circle(351.475028818896,54.8866414741121,6")
fk5;-circle(351.492425414385,54.8796197366385,6")
fk5;-circle(351.469711439754,54.8862892460764,6")
fk5;-circle(351.480529370043,54.887108437474,6")
fk5;-circle(351.460175737743,54.8816730382439,6")
fk5;-circle(351.496875780319,54.8743550013833,6")
fk5;-circle(351.49159667027,54.8691611733386,6")
fk5;-circle(351.474105466365,54.8649200902744,6")
fk5;-circle(351.477199373793,54.8623405424013,6")
Region file: 887579_570952857_190204d13h39m14s962799usUT_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(351.47821,54.87636,8")
Region file: 887579_570952857_190204d13h39m14s962799usUT_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(351.47821,54.87636,25")
fk5;-circle(351.47821,54.87636,15")
fk5;-circle(351.478795424974,54.8718768098311,6")
fk5;-circle(351.49118962738,54.8760951797246,6")
image paragraph message for exposure 3 of trigger 887579
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 GRB190204 (Swift/BAT trigger 887579) at 05:46:00 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 874 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 19.6 mag.
The 8'x8' region for the list of sources generated on-board covers 100% of the
XRT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.38.
------- notes for trigger 887579 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190204d13h39m21s316647usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=887579
-expid=570952857 -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/887579/
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 570952857.10138 or about 2019:035:06:00:52 UT
Found 3148 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 31% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 10 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 19.22 mag.
Found 48 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
20.58 mag. Found 344 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 32% of the Genie image region.
Genie image analysis:
Found 60859.6 counts in the large background region of 5349.0 pixels or a rate
of 11.378 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 20.03 mag. for a
4-arcsec aperture.
Found 3438.2 counts in the XRT position region of 199.0 pixels or a rate of
17.277 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 7.803 +/- 0.413 (1-sigma) cps or
17.55 mag and a range from 17.49 to 17.61 mag. The 3-sigma UL at the XRT
position is 9.042 cps or 17.39 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.79 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 351.4758 dec= 54.8773 mag=18.18 sep=5.98".
The closest srclist source has ra= 351.4758 dec= 54.8773 mag=18.18 sep=5.98".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 351.4755 dec= 54.8773 mag=17.51 sep=6.58". The closest Genie
source has ra= 351.4755 dec= 54.8773 mag=17.51 sep=6.58".
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 White filter
starting 874 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 23:25:54.12 = 351.47552
DEC(J2000) = +54:52:38.4 = 54.87734
with a 90%-confidence error radius of about 0.62 arc sec. This position is 6.58
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.51 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.38.
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?
570952857 873 WHITE srclist found no candidates.
570952857 873 WHITE image found no candidates.
List afterglow candidates for other finding charts.
570952066 82 WHITE 351.47704 54.87647 17.71/19.2 2.5 srclist Yes
570952066 82 WHITE image found no candidates.
570952278 294 U 351.47772 54.87631 18.21/18.1 1.0 srclist Yes
570952278 294 U 351.47742 54.87637 17.76/20.3 1.6 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 54.87636
GRB_ERROR: 5
GRB_RA: 351.47821
IMAGE_START_TIME: 06:00:52
MAGNITUDE: 17.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT