image overlap message for exposure 1 of trigger 895479
uvot_overlap.pl vrs. 2010-12-20b fem started at 190327d22h04m18s100584usUT
The observation of trigger 895479 started 2019-03-27T21:31:21.8
Examining file ./895479_g215_uvot_sky_image.fits
The exposure ID is 575415081
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (314.7136,41.7455) with a roll angle of 115.6
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 (314.7050,41.7450) with a radius of 3.000 arc min
This is 0.385 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 (314.6977,41.7765) with a radius of 0.035 arc min
This is 1.987 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 0.000 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 895479
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190327d22h04m23s489276usUT
Observation start time is 2019-03-27T21:31:21.8
Examining file ./895479_g215_uvot_catalog_image.fits
The exposure ID is 575415081
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 4 detected source(s) for 895479_g215
Aspect correction adds 0.00110 degrees (0.263 sec of time = 2.95 arc sec) to RA
Aspect correction adds -0.00081 degrees (-2.93 arcsec) to Dec
Total aspect correction is 4.16 arcsec
Star catalogs centered at 314.7059 , 41.7474 with radius 2.24 arc min.
n_usno: 202 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 4 matched entries is 0.510" for 895479_g215
Mean and std. dev of mag. difference (MAG_DELTA) are 2.572 and 0.671 for 895479_g215
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 895479_g215.
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=314.7050 (20:58:49.20) DEC=41.7450 (+41:44:42.0)
XRT distances are from RA=314.6977 (20:58:47.44) DEC=41.7765 (+41:46:35.3)
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 2.3 -1 USNO-B1 16.73 13.82 15.12
The closest star is 2.29" away.
List UVOT sources within 10" of the XRT position:
There are 28240.684 counts in the bkg source region of 6196.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.558 counts/pixel (5-sig UL in 4" is 19.64 mag) for 895479_g215
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 20.20, 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: 895479_575415081_190327d22h04m23s489276usUT_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(314.7136,41.7455,45")
fk5;-circle(314.713177887057,41.7416115056833,6")
image paragraph message for exposure 1 of trigger 895479
IMAGE PROBLEM: no overlap
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB190327 (Swift/BAT trigger 895479) at 21:27:45 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
193 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 none of the
XRT error circle. 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 895479 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190327d22h04m26s881044usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=895479
-expid=575415081 -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/895479/
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 575415081.83332 or about 2019:086:21:31:16 UT
Found 3405 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 29% of the srclist region. Found 117 sources in
srclist catalog. Found 40 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 4 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 20.20 mag. Found 198 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 28240.7 counts in the large background region of 6196.0 pixels or a rate
of 4.558 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 19.68 mag. for a
4-arcsec aperture.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 314.6979 dec= 41.7769 mag=16.30 sep=1.77".
The closest srclist source has ra= 314.6979 dec= 41.7769 mag=16.30 sep=1.77".
The closest Genie source has ra= 314.7059 dec= 41.7666 mag=19.33 sep=41.91".
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 250 seconds with the U filter starting
193 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 20:58:47.50 = 314.69790
DEC(J2000) = +41:46:36.9 = 41.77693
with a 90%-confidence error radius of about 1.10 arc sec. This position is 1.77
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.30 with a 1-sigma error of about 0.35. 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?
575415081 193 U srclist found no candidates.
575415081 193 U image found no candidates.
List afterglow candidates for other finding charts.
575415765 877 U srclist found no candidates.
575415765 877 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 41.77647
GRB_ERROR: 5.25
GRB_RA: 314.69767
IMAGE_START_TIME: 21:31:16
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT