image overlap message for exposure 2 of trigger 890732
uvot_overlap.pl vrs. 2010-12-20b fem started at 190226d06h34m05s420159usUT
The observation of trigger 890732 started 2019-02-26T06:27:43.6
Examining file 890732_g893_uvot_sky_image.fits
The exposure ID is 572855263
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (247.8218,-47.8064) with a roll angle of 96.8
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 (247.8210,-47.7920) with a radius of 3.000 arc min
This is 0.866 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 (247.8173,-47.8066) with a radius of 0.087 arc min
This is 0.182 arc min from the center of the uvot region
The area of the XRT error circle is 0.024 sq. arc min
The UVOT/XRT overlap is 0.024 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 890732
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190226d06h34m06s512056usUT
Observation start time is 2019-02-26T06:27:43.6
Examining file 890732_g893_uvot_catalog_image.fits
The exposure ID is 572855263
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 46 detected source(s) for 890732_g893
Aspect correction adds -0.00135 degrees (-0.324 sec of time = -3.27 arc sec) to RA
Aspect correction adds -0.00028 degrees (-1.02 arcsec) to Dec
Total aspect correction is 3.42 arcsec
Star catalogs centered at 247.8144 , -47.8055 with radius 2.66 arc min.
n_usno: 486 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.6424
RA DEC Mag Color
bright star 0: 247.76332 (16:31:03.20) -47.79031 (-47:47:25.1) 11.64 USNO-V
Mean distance difference (CAT_DELTA) for 50 matched entries is 0.738" for 890732_g893
Mean and std. dev of mag. difference (MAG_DELTA) are 1.636 and 0.453 for 890732_g893
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 890732_g893.
Acceptable entries have no ID, XRT distances < 13", 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=247.8210 (16:31:17.04) DEC=-47.7920 (-47:47:31.2)
XRT distances are from RA=247.8173 (16:31:16.15) DEC=-47.8066 (-47:48:23.8)
-----------------
Entry 3 in the list of sources is a candidate afterglow for 890732_g893 with genie
ra=247.80768 (16:31:13.84) dec=-47.81116 (-47:48:40.2) +/- 0.7" mag=19.47+/-0.18
dist=28.5 REFID=28 major=1.1 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 76.1 arc sec from the BAT position.
Found 6 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
247.8136 -47.8120 14.5 -1 USNO-B1 17.98 18.05 18.02
247.8081 -47.8108 1.5 -1 USNO-B1 17.85 15.67 16.64 *
247.8113 -47.8123 9.8 -1 USNO-B1 19.61 17.29 18.32
247.8029 -47.8076 17.2 -1 USNO-B1 19.77 18.01 18.79
247.8111 -47.8137 12.3 -1 USNO-B1 19.33 17.27 18.18
247.8097 -47.8142 12.1 -1 USNO-B1 20.39 18.14 19.14
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 42 in the list of sources is a candidate afterglow for 890732_g893 with genie
ra=247.83247 (16:31:19.79) dec=-47.82633 (-47:49:34.8) +/- 0.6" mag=18.89+/-0.16
dist=79.9 REFID=44 major=1.9 minor=1.3 flag=1 (neighbor)
*** The position of this source is inconsistent with the XRT position.
The position is 126.6 arc sec from the BAT position.
Found 9 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
247.8291 -47.8264 8.3 -1 USNO-B1 15.31 14.44 14.82
247.8307 -47.8261 4.4 -1 USNO-B1 15.61 16.97 16.37
247.8319 -47.8256 2.9 -1 USNO-B1 19.27 16.07 17.49 *
247.8290 -47.8267 8.4 -1 USNO-B1 15.75 99.99 99.99
247.8287 -47.8270 9.5 -1 USNO-B1 15.45 14.36 14.84
247.8325 -47.8258 1.9 -1 USNO-B1 17.97 15.83 16.78 *
247.8348 -47.8284 9.2 -1 USNO-B1 18.48 16.45 17.35
247.8341 -47.8293 11.5 -1 USNO-B1 18.01 15.73 16.75
247.8367 -47.8292 14.7 -1 USNO-B1 20.71 99.99 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 44 in the list of sources is a candidate afterglow for 890732_g893 with genie
ra=247.85042 (16:31:24.10) dec=-47.80468 (-47:48:16.9) +/- 0.8" mag=19.99+/-0.21
dist=80.4 REFID=23 major=1.1 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 84.5 arc sec from the BAT position.
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
247.8455 -47.8039 12.3 -1 USNO-B1 17.55 17.41 17.47
247.8469 -47.8001 18.5 -1 USNO-B1 17.62 15.91 16.67
247.8480 -47.8035 7.3 -1 USNO-B1 17.90 16.17 16.94
247.8500 -47.8046 1.0 -1 USNO-B1 19.07 17.13 17.99 *
247.8563 -47.8072 16.7 -1 USNO-B1 19.48 17.65 18.46
247.8576 -47.8035 18.0 -1 USNO-B1 18.93 17.35 18.05
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
Found 3 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
247.8147 -47.8071 6.6 -1 USNO-B1 18.69 16.98 17.74
247.8154 -47.8073 5.3 -1 USNO-B1 17.83 17.76 17.79
247.8178 -47.8059 2.7 -1 USNO-B1 19.38 17.61 18.39
The closest star is 2.70" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=247.81462 (16:31:15.51) dec=-47.80701 (-47:48:25.2) +/- 0.7" mag=19.58+/-0.18 dist=6.6 REFID=24 flag=0
There are 98984.617 counts in the bkg source region of 5439.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 18.199 counts/pixel (5-sig UL in 4" is 19.77 mag) for 890732_g893
There are 3903.1721 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 19.614 counts/pixel for 890732_g893
There are 21195.596 counts in the xrt_bkg source region of 1142.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 18.560 counts/pixel (5-sig UL in 4" is 19.76 mag) for 890732_g893
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 20.33, XRT distances < 13",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 890732_572855263_190226d06h34m06s512056usUT_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(247.8218,-47.8064,45")
fk5;-circle(247.814624243622,-47.8070078222501,6")
fk5;-circle(247.813555483448,-47.8002139719785,6")
fk5;-circle(247.823369749078,-47.8128440919224,6")
fk5;-circle(247.807682526138,-47.8111611327808,6")
fk5;-circle(247.805294717228,-47.8013457892887,6")
fk5;-circle(247.828354102731,-47.8142255219063,6")
fk5;-circle(247.810033415536,-47.7960064813902,6")
fk5;-circle(247.825702721558,-47.8175854325522,6")
fk5;-circle(247.821019336569,-47.7933003719091,6")
fk5;-circle(247.839881131694,-47.8084934270383,6")
fk5;-circle(247.833493665903,-47.7948402869961,6")
fk5;-circle(247.84183403774,-47.8052465028857,6")
Region file: 890732_572855263_190226d06h34m06s512056usUT_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(247.8173,-47.8066,8")
Region file: 890732_572855263_190226d06h34m06s512056usUT_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(247.8173,-47.8066,25")
fk5;-circle(247.8173,-47.8066,15")
fk5;-circle(247.813555483448,-47.8002139719785,6")
fk5;-circle(247.823369749078,-47.8128440919224,6")
fk5;-circle(247.807682526138,-47.8111611327808,6")
image paragraph message for exposure 2 of trigger 890732
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: high density of stars
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
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 GRB190226 (Swift/BAT trigger 890732) at 06:12:49 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 871 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. Because of the density of catalogued stars, further
analysis is required to report an upper limit for any afterglow in the
sub-image. 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 large, but uncertain,
extinction expected.
------- notes for trigger 890732 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190226d06h34m08s074319usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=890732
-expid=572855263 -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/890732/
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. XRT position found for srclist. XRT position found for Genie
image. BAT position found.
UVOT exposure began at MET 572855263.63806 or about 2019:057:06:27:38 UT
Found 4071 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 40% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 16 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 46 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
20.33 mag. Found 482 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 47% of the Genie image region.
Genie image analysis:
Found 98984.6 counts in the large background region of 5439.0 pixels or a rate
of 18.199 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 19.78 mag. for a
4-arcsec aperture.
Found 3903.2 counts in the XRT position region of 199.0 pixels or a rate of
19.614 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 1.398 +/- 0.450 (1-sigma) cps or
19.42 mag and a range from 19.11 to 19.84 mag. The 3-sigma UL at the XRT
position is 2.747 cps or 18.68 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.55 mag. The closest
srclist source has ra= 247.8284 dec= -47.8142 mag=17.04 sep=38.40".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 247.8146 dec= -47.8070 mag=19.58 sep=6.63". The closest Genie
source has ra= 247.8146 dec= -47.8070 mag=19.58 sep=6.63".
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 871 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 16:31:15.51 = 247.81462
DEC(J2000) = -47:48:25.2 = -47.80701
with a 90%-confidence error radius of about 0.70 arc sec. This position is 6.63
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.58 with a 1-sigma error of about 0.18. No correction has been made for the
large, but uncertain, extinction expected.
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?
572855263 871 WHITE srclist found no candidates.
572855263 871 WHITE image found no candidates.
List afterglow candidates for other finding charts.
572854907 515 WHITE srclist found no candidates.
572854907 515 WHITE image found no candidates.
------- Tokens for Quick GCN -------