srclist overlap message for exposure 3 of trigger 853824
uvot_overlap.pl vrs. 2010-12-20b fem started at 180818d05h33m05s036688usUT
The observation of trigger 853824 started 2018-08-18T03:26:53.3
Examining file ./853824_g888_uvot_sky_srclist.fits
The exposure ID is 556255613
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (169.6313,-48.3411) with a roll angle of 336.0
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 (169.6110,-48.3440) with a radius of 3.000 arc min
This is 0.829 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 (169.6368,-48.3444) with a radius of 0.032 arc min
This is 0.294 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 3 of trigger 853824
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180818d05h33m23s002304usUT
Observation start time is 2018-08-18T03:26:53.3
Examining file ./853824_g888_uvot_catalog_srclist.fits
The exposure ID is 556255613
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 190 detected source(s) for 853824_g888
*** WARNING -- the sources have filled the available telemetry buffer (190).
srclist_overlap returned: bat_overlap 1.000
srclist_overlap returned: xrt_overlap 1.000
Dimmest detected source in 853824_g888 has mag 18.74
Aspect correction adds 0.00056 degrees (0.135 sec of time = 1.35 arc sec) to RA
Aspect correction adds 0.00103 degrees ( 3.72 arcsec) to Dec
Total aspect correction is 3.95 arcsec
Star catalogs centered at 169.6254 , -48.3404 with radius 8.67 arc min.
n_usno: 3228 n_gsc: 0
*** WARNING -- bright star catalog has 12 entries brighter than 12 mag
The brightest has mag 9.4952
RA DEC Mag Color
bright star 0: 169.57303 (11:18:17.53) -48.37272 (-48:22:21.8) 11.13 USNO-R
bright star 1: 169.54243 (11:18:10.18) -48.37181 (-48:22:18.5) 11.22 USNO-V
bright star 2: 169.63118 (11:18:31.48) -48.27184 (-48:16:18.6) 11.08 USNO-V
bright star 3: 169.50816 (11:18:01.96) -48.34862 (-48:20:55.0) 11.64 USNO-V
bright star 4: 169.73650 (11:18:56.76) -48.30915 (-48:18:33.0) 9.50 USNO-V
bright star 5: 169.63996 (11:18:33.59) -48.42122 (-48:25:16.4) 11.32 USNO-V
bright star 6: 169.52670 (11:18:06.41) -48.27909 (-48:16:44.7) 11.32 USNO-R
bright star 7: 169.52869 (11:18:06.88) -48.40520 (-48:24:18.7) 11.87 USNO-V
bright star 8: 169.71295 (11:18:51.11) -48.41581 (-48:24:56.9) 11.89 USNO-V
bright star 9: 169.62040 (11:18:28.90) -48.45764 (-48:27:27.5) 10.87 USNO-V
bright star 10: 169.48554 (11:17:56.53) -48.26151 (-48:15:41.4) 11.91 USNO-V
bright star 11: 169.83312 (11:19:19.95) -48.31224 (-48:18:44.0) 11.97 USNO-V
Mean distance difference (CAT_DELTA) for 194 matched entries is 0.690" for 853824_g888
Mean and std. dev of mag. difference (MAG_DELTA) are 1.073 and 0.882 for 853824_g888
Found 12 entries without IDs and 2 entries that are acceptable afterglow candidates for 853824_g888.
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.
1 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=169.6110 (11:18:26.64) DEC=-48.3440 (-48:20:38.4)
XRT distances are from RA=169.6368 (11:18:32.83) DEC=-48.3444 (-48:20:39.9)
-----------------
Entry 30 in the list of sources is a candidate afterglow for 853824_g888 with 3x3 stamp
ra=169.65897 (11:18:38.15) dec=-48.37965 (-48:22:46.7) +/- 1.1" mag=13.86+/-0.35
dist=137.5 REFID=13
*** The position of this source is inconsistent with the XRT position.
The position is 172.2 arc sec from the BAT position.
src: 30 distr. of nearby unmatched sources: 1 1 0 0 0
Found 7 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
169.6525 -48.3775 17.4 -1 USNO-B1 19.17 17.35 18.16
169.6609 -48.3748 18.0 -1 USNO-B1 17.40 15.30 16.23
169.6595 -48.3802 2.3 -1 USNO-B1 14.18 12.91 13.47 *
169.6583 -48.3811 5.6 -1 USNO-B1 20.82 11.86 15.84 *
169.6601 -48.3813 6.6 -1 USNO-B1 12.66 12.01 12.30 *
169.6657 -48.3810 16.9 -1 USNO-B1 19.41 17.97 18.61
169.6608 -48.3831 13.0 -1 USNO-B1 15.23 13.48 14.25
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 37 in the list of sources is a candidate afterglow for 853824_g888 with 1x1 stamp
ra=169.57879 (11:18:18.91) dec=-48.32263 (-48:19:21.5) +/- 1.1" mag=18.18+/-0.35
dist=159.5 REFID=179
*** The position of this source is inconsistent with the XRT position.
The position is 108.9 arc sec from the BAT position.
src: 37 srclist_match has ID
src: 37 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
169.5783 -48.3225 1.2 -1 USNO-B1 18.08 16.41 17.15 *
169.5779 -48.3220 3.3 -1 USNO-B1 21.35 18.84 19.95 *
169.5774 -48.3214 5.4 -1 USNO-B1 17.93 19.01 18.53
169.5727 -48.3211 15.5 -1 USNO-B1 18.08 16.95 17.45
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Matched source ra=169.63928 (11:18:33.43) dec=-48.34656 (-48:20:47.6) +/- 1.1" mag=17.94+/-0.35 dist=9.7 REFID=156
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 19.22, XRT distances < 5",
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 3 of trigger 853824
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 GRB180818 (Swift/BAT trigger 853824) at 03:12:04 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 867 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
0.11.
------- notes for trigger 853824 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180818d05h33m28s354857usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=853824
-expid=556255613 -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/853824/
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 556255613.309 or about 2018:230:03:26:48 UT
Found 3224 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 29% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 12 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 40 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 3 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.46 mag. Found 365 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 31% of the Genie image region.
Genie image analysis:
Found 76447.4 counts in the large background region of 5351.0 pixels or a rate
of 14.287 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 19.91 mag. for a
4-arcsec aperture.
Found 2995.4 counts in the XRT position region of 199.0 pixels or a rate of
15.052 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.869 +/- 0.396 (1-sigma) cps or
19.93 mag and a range from 19.52 to 20.59 mag. The 3-sigma UL at the XRT
position is 2.057 cps or 19.00 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.74 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 169.6393 dec= -48.3466 mag=17.94 sep=9.73".
The closest srclist source has ra= 169.6393 dec= -48.3466 mag=17.94 sep=9.73".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 169.6395 dec= -48.3465 mag=17.42 sep=9.98". The closest Genie
source has ra= 169.6395 dec= -48.3465 mag=17.42 sep=9.98".
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 867 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 11:18:33.48 = 169.63952
DEC(J2000) = -48:20:47.5 = -48.34652
with a 90%-confidence error radius of about 0.62 arc sec. This position is 9.98
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.42 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.11.
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?
556255613 867 WHITE srclist found no candidates.
556255613 867 WHITE image found no candidates.
List afterglow candidates for other finding charts.
556254828 82 WHITE srclist found no candidates.
556254828 82 WHITE image found no candidates.
556254986 240 U srclist found no candidates.
556254986 240 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -48.34442
GRB_ERROR: 5
GRB_RA: 169.63679
IMAGE_START_TIME: 03:26:48
MAGNITUDE: 19.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT