image overlap message for exposure 1 of trigger 894268
uvot_overlap.pl vrs. 2010-12-20b fem started at 190322d11h24m12s906866usUT
The observation of trigger 894268 started 2019-03-22T11:11:21.4
Examining file ./894268_g895_uvot_sky_image.fits
The exposure ID is 574945881
The exposure time is 149.868 (seconds)
The filter is U.
The uvot region is centered at (314.7030,41.7767) with a roll angle of 121.6
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 (314.6560,41.7850) with a radius of 3.000 arc min
This is 2.162 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 5.85 sq. arc min or 0.21 of the BAT error circle
The XRT error circle is centered at (314.6988,41.7743) with a radius of 0.077 arc min
This is 0.238 arc min from the center of the uvot region
The area of the XRT error circle is 0.018 sq. arc min
The UVOT/XRT overlap is 0.018 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 894268
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190322d11h24m18s652073usUT
Observation start time is 2019-03-22T11:11:21.4
Examining file ./894268_g895_uvot_catalog_image.fits
The exposure ID is 574945881
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is U
There are 5 detected source(s) for 894268_g895
Aspect correction adds 0.00030 degrees (0.071 sec of time = 0.79 arc sec) to RA
Aspect correction adds -0.00088 degrees (-3.16 arcsec) to Dec
Total aspect correction is 3.26 arcsec
Star catalogs centered at 314.7033 , 41.7778 with radius 2.14 arc min.
n_usno: 211 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 5 matched entries is 0.278" for 894268_g895
Mean and std. dev of mag. difference (MAG_DELTA) are 1.295 and 0.613 for 894268_g895
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 894268_g895.
Acceptable entries have no ID, XRT distances < 11.5", 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=314.6560 (20:58:37.44) DEC=41.7850 (+41:47:06.0)
XRT distances are from RA=314.6988 (20:58:47.70) DEC=41.7743 (+41:46:27.6)
Found 1 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
314.6981 41.7770 9.9 -1 USNO-B1 16.73 13.82 15.12
The closest star is 9.88" away.
List UVOT sources within 10" of the XRT position:
There are 31294.227 counts in the bkg source region of 6138.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.098 counts/pixel (5-sig UL in 4" is 19.03 mag) for 894268_g895
There are 1144.3391 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 5.779 counts/pixel for 894268_g895
There are 6350.3823 counts in the xrt_bkg source region of 1242.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 5.113 counts/pixel (5-sig UL in 4" is 19.02 mag) for 894268_g895
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 19.58, XRT distances < 11.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 894268_574945881_190322d11h24m18s652073usUT_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(314.7030,41.7767,45")
fk5;-circle(314.698023358025,41.7770647934285,6")
fk5;-circle(314.686372203316,41.7741995366161,6")
fk5;-circle(314.691829797994,41.7659866753097,6")
Region file: 894268_574945881_190322d11h24m18s652073usUT_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(314.69875,41.77433,8")
Region file: 894268_574945881_190322d11h24m18s652073usUT_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(314.69875,41.77433,25")
fk5;-circle(314.69875,41.77433,15")
fk5;-circle(314.698023358025,41.7770647934285,6")
image paragraph message for exposure 1 of trigger 894268
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB190322 (Swift/BAT trigger 894268) at 10:56:25 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the U filter starting
873 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 19.2 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 18.0 mag. No
correction has been made for the large, but uncertain, extinction expected.
------- notes for trigger 894268 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190322d11h24m30s138139usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=894268
-expid=574945881 -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/894268/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
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 574945881.44722 or about 2019:081:11:11:16 UT
Found 2365 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 27% of the srclist region. Found 67 sources in
srclist catalog. Found 7 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.84 mag.
Found 5 source(s) in Genie image catalog. 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 19.58 mag. Found 207 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 31294.2 counts in the large background region of 6138.0 pixels or a rate
of 5.098 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 19.07 mag. for a
4-arcsec aperture.
Found 1144.3 counts in the XRT position region of 198.0 pixels or a rate of
5.779 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.879 +/- 0.241 (1-sigma) cps or
18.52 mag and a range from 18.26 to 18.87 mag. The 3-sigma UL at the XRT
position is 1.602 cps or 17.87 mag. The closest srclist source has ra= 314.6982
dec= 41.7771 mag=16.61 sep=10.19". The closest Genie source has ra= 314.6980
dec= 41.7771 mag=15.69 sep=10.04".
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?
574945881 873 U srclist found no candidates.
574945881 873 U image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 41.77433
GRB_ERROR: 11.5
GRB_RA: 314.69875
IMAGE_START_TIME: 11:11:16
MAGNITUDE: 17.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT