image overlap message for exposure 3 of trigger 821103
uvot_overlap.pl vrs. 2010-12-20b fem started at 180402d11h04m04s233465usUT
The observation of trigger 821103 started 2018-04-02T10:57:28.2
Examining file 821103_g4348_uvot_sky_image.fits
The exposure ID is 544359448
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (251.9102,-14.9628) with a roll angle of 92.9
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 (251.9050,-14.9630) with a radius of 3.000 arc min
This is 0.303 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 (251.9336,-14.9686) with a radius of 0.035 arc min
This is 1.397 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.002 sq. arc min or 0.55 of the XRT error circle
image afterglow message for exposure 3 of trigger 821103
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180402d11h04m06s293065usUT
Observation start time is 2018-04-02T10:57:28.2
Examining file 821103_g4348_uvot_catalog_image.fits
The exposure ID is 544359448
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 18 detected source(s) for 821103_g4348
Aspect correction adds 0.00090 degrees (0.215 sec of time = 3.12 arc sec) to RA
Aspect correction adds 0.00041 degrees ( 1.47 arcsec) to Dec
Total aspect correction is 3.45 arcsec
Star catalogs centered at 251.9075 , -14.9641 with radius 2.48 arc min.
n_usno: 133 n_gsc: 155
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 18 matched entries is 0.351" for 821103_g4348
Mean and std. dev of mag. difference (MAG_DELTA) are 0.919 and 0.571 for 821103_g4348
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 821103_g4348.
Acceptable entries have no ID, XRT distances < 5.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
Magnitude criteria will be applied later.
BAT distances are from RA=251.9050 (16:47:37.20) DEC=-14.9630 (-14:57:46.8)
XRT distances are from RA=251.9336 (16:47:44.06) DEC=-14.9686 (-14:58:06.9)
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
251.9319 -14.9691 6.3 -1 USNO-B1 19.84 18.04 18.83
251.9319 -14.9692 6.3 -1 GSC2.3 18.23 19.78 99.99
The closest star is 6.26" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=251.93184 (16:47:43.64) dec=-14.96906 (-14:58:08.6) +/- 0.8" mag=20.18+/-0.21 dist=6.3 REFID=9 flag=0
There are 85646.445 counts in the bkg source region of 6037.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 14.187 counts/pixel (5-sig UL in 4" is 19.91 mag) for 821103_g4348
Do not compute counts in XRT region because position is too far from center.
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 20.46, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 821103_544359448_180402d11h04m06s293065usUT_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(251.9102,-14.9628,45")
fk5;-circle(251.902259585955,-14.9743457007437,6")
fk5;-circle(251.915023791182,-14.9555215088601,6")
fk5;-circle(251.914772401047,-14.9516784084585,6")
fk5;-circle(251.919983223945,-14.9550176402799,6")
fk5;-circle(251.92447464718,-14.9611171338726,6")
image paragraph message for exposure 3 of trigger 821103
IMAGE PROBLEM: partial overlap
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 GRB180402 (Swift/BAT trigger 821103) at 09:44:59 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 4328 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 55%
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 0.77.
------- notes for trigger 821103 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180402d11h04m09s191847usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=821103
-expid=544359448 -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/821103/
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 544359448.19438 or about 2018:092:10:57:23 UT
Found 957 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 18% of the srclist region. Found 86 sources in
srclist catalog. Found 2 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 18 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 0 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 153 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 17% of the Genie image region.
Genie image analysis:
Found 85646.4 counts in the large background region of 6037.0 pixels or a rate
of 14.187 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. The closest srclist source has ra= 251.9381 dec= -14.9707
mag=18.47 sep=17.46".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 251.9318 dec= -14.9691 mag=20.18 sep=6.30". The closest Genie
source has ra= 251.9318 dec= -14.9691 mag=20.18 sep=6.30".
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 4328 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 16:47:43.64 = 251.93184
DEC(J2000) = -14:58:08.6 = -14.96906
with a 90%-confidence error radius of about 0.78 arc sec. This position is 6.30
arc sec. from the center of the XRT error circle. The estimated magnitude is
20.18 with a 1-sigma error of about 0.21. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.77.
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?
544359448 4328 WHITE srclist found no candidates.
544359448 4328 WHITE image found no candidates.
List afterglow candidates for other finding charts.
544355259 139 U srclist found no candidates.
544355259 139 U image found no candidates.
544355993 873 U srclist found no candidates.
544355993 873 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -14.96858
GRB_ERROR: 5.25
GRB_RA: 251.93358
IMAGE_START_TIME: 10:57:23
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT