image overlap message for exposure 1 of trigger 887541
uvot_overlap.pl vrs. 2010-12-20b fem started at 190203d21h37m49s008113usUT
The observation of trigger 887541 started 2019-02-03T21:28:42.1
Examining file 887541_g624_uvot_sky_image.fits
The exposure ID is 570922122
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (262.2511,-36.2440) with a roll angle of 82.9
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 (262.3010,-36.2670) with a radius of 3.000 arc min
This is 2.780 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 3.90 sq. arc min or 0.14 of the BAT error circle
The XRT error circle is centered at (262.2442,-36.2421) with a radius of 0.078 arc min
This is 0.353 arc min from the center of the uvot region
The area of the XRT error circle is 0.019 sq. arc min
The UVOT/XRT overlap is 0.019 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 887541
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190203d21h37m50s073767usUT
Observation start time is 2019-02-03T21:28:42.1
Examining file 887541_g624_uvot_catalog_image.fits
The exposure ID is 570922122
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 14 detected source(s) for 887541_g624
Aspect correction adds 0.00016 degrees (0.039 sec of time = 0.48 arc sec) to RA
Aspect correction adds -0.00028 degrees (-1.01 arcsec) to Dec
Total aspect correction is 1.12 arcsec
Star catalogs centered at 262.2515 , -36.2435 with radius 2.35 arc min.
n_usno: 223 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.46348
RA DEC Mag Color
bright star 0: 262.24535 (17:28:58.88) -36.26051 (-36:15:37.8) 10.46 USNO-V
Mean distance difference (CAT_DELTA) for 11 matched entries is 0.675" for 887541_g624
Mean and std. dev of mag. difference (MAG_DELTA) are 1.525 and 0.771 for 887541_g624
Found 4 entries without IDs and 0 entries that are acceptable afterglow candidates for 887541_g624.
Acceptable entries have no ID, XRT distances < 11.75", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
3 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=262.3010 (17:29:12.24) DEC=-36.2670 (-36:16:01.2)
XRT distances are from RA=262.2442 (17:28:58.61) DEC=-36.2421 (-36:14:31.6)
*** WARNING 28 per cent of entries have no IDs.
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 3:
ra=262.25111 dec=-36.25886 +/- 0.6" mag=17.48+/-0.14 dist=63.6 REFID=11 flag=0
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
262.2427 -36.2431 5.6 -1 USNO-B1 20.03 18.02 18.92
262.2430 -36.2408 5.8 -1 USNO-B1 21.95 18.99 20.30
262.2424 -36.2403 8.4 -1 USNO-B1 21.44 18.48 19.79
The closest star is 5.63" away.
List UVOT sources within 10" of the XRT position:
There are 1.7982088E+05 counts in the bkg source region of 6088.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 29.537 counts/pixel (5-sig UL in 4" is 19.51 mag) for 887541_g624
There are 6095.5073 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 30.478 counts/pixel for 887541_g624
There are 36089.531 counts in the xrt_bkg source region of 1242.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 29.058 counts/pixel (5-sig UL in 4" is 19.52 mag) for 887541_g624
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 20.07, XRT distances < 11.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 887541_570922122_190203d21h37m50s073767usUT_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(262.2511,-36.2440,45")
fk5;-circle(262.250034128191,-36.2353807681272,6")
fk5;-circle(262.238387102882,-36.2531530479715,6")
fk5;-circle(262.260264417883,-36.2408772674432,6")
Region file: 887541_570922122_190203d21h37m50s073767usUT_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(262.2442,-36.2421,8")
Region file: 887541_570922122_190203d21h37m50s073767usUT_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(262.2442,-36.2421,25")
fk5;-circle(262.2442,-36.2421,15")
fk5;-circle(262.250034128191,-36.2353807681272,6")
image paragraph message for exposure 1 of trigger 887541
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB190203 (Swift/BAT trigger 887541) at 21:18:17 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 602 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 large, but uncertain, extinction expected.
------- notes for trigger 887541 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190203d21h37m51s764803usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=887541
-expid=570922122 -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/887541/
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.
*** Warning -- BAT and XRT error circles do NOT overlap.
UVOT exposure began at MET 570922122.10418 or about 2019:034:21:28:37 UT
Found 1848 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 27% of the srclist region. Found 141 sources in
srclist catalog. Found 14 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 14 source(s) in Genie image catalog. Found 4 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.07 mag. Found 219 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
27% of the Genie image region.
Genie image analysis:
Found 179820.9 counts in the large background region of 6088.0 pixels or a rate
of 29.537 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 19.51 mag. for a
4-arcsec aperture.
Found 6095.5 counts in the XRT position region of 200.0 pixels or a rate of
30.477 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 1.893 +/- 0.559 (1-sigma) cps or
19.09 mag and a range from 18.81 to 19.47 mag. The 3-sigma UL at the XRT
position is 3.570 cps or 18.40 mag. The closest srclist source has ra= 262.2502
dec= -36.2354 mag=15.97 sep=29.67". The closest Genie source has ra= 262.2500
dec= -36.2354 mag=15.36 sep=29.53".
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?
570922122 602 WHITE srclist found no candidates.
570922122 602 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -36.24210
GRB_ERROR: 11.75
GRB_RA: 262.24420
IMAGE_START_TIME: 21:28:37
MAGNITUDE: 18.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT