image overlap message for exposure 1 of trigger 904394
uvot_overlap.pl vrs. 2010-12-20b fem started at 190519d16h46m08s841677usUT
The observation of trigger 904394 started 2019-05-19T07:28:32.8
Examining file ./904394_g172_uvot_sky_image.fits
The exposure ID is 579943712
The exposure time is 249.924 (seconds)
The filter is U.
The uvot region is centered at (114.7619,-38.8016) with a roll angle of 305.1
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 (114.7640,-38.8240) with a radius of 3.000 arc min
This is 1.350 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 7.13 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (114.7676,-38.8054) with a radius of 0.027 arc min
This is 0.350 arc min from the center of the uvot region
The area of the XRT error circle is 0.002 sq. arc min
The UVOT/XRT overlap is 0.002 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 904394
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190519d16h46m10s716537usUT
Observation start time is 2019-05-19T07:28:32.8
Examining file ./904394_g172_uvot_catalog_image.fits
The exposure ID is 579943712
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 13 detected source(s) for 904394_g172
Aspect correction adds -0.00113 degrees (-0.272 sec of time = -3.18 arc sec) to RA
Aspect correction adds 0.00168 degrees ( 6.05 arcsec) to Dec
Total aspect correction is 6.84 arcsec
Star catalogs centered at 114.7678 , -38.8017 with radius 2.36 arc min.
n_usno: 235 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 13 matched entries is 0.639" for 904394_g172
Mean and std. dev of mag. difference (MAG_DELTA) are 1.894 and 0.627 for 904394_g172
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 904394_g172.
Acceptable entries have no ID, XRT distances < 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=114.7640 (07:39:03.36) DEC=-38.8240 (-38:49:26.4)
XRT distances are from RA=114.7676 (07:39:04.22) DEC=-38.8054 (-38:48:19.4)
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
114.7648 -38.8039 9.4 -1 USNO-B1 20.67 18.49 19.46
114.7682 -38.8051 2.1 -1 USNO-B1 19.04 18.00 18.46
114.7703 -38.8061 8.2 -1 USNO-B1 18.51 16.72 17.51
The closest star is 2.10" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=114.77050 (07:39:04.92) dec=-38.80618 (-38:48:22.2) +/- 0.8" mag=19.11+/-0.22 dist=8.7 REFID=11 flag=0
There are 60381.262 counts in the bkg source region of 5644.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 10.698 counts/pixel (5-sig UL in 4" is 19.18 mag) for 904394_g172
There are 2217.7498 counts in the xrt source region of 202.00000 pixels.
Rate in xrt region with 8 arcsec radius is 10.979 counts/pixel for 904394_g172
There are 12514.520 counts in the xrt_bkg source region of 1181.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 10.597 counts/pixel (5-sig UL in 4" is 19.18 mag) for 904394_g172
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 19.73, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 904394_579943712_190519d16h46m10s716537usUT_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(114.7619,-38.8016,45")
fk5;-circle(114.770496860699,-38.8061776982861,6")
fk5;-circle(114.767038104925,-38.7986568350451,6")
fk5;-circle(114.763181382301,-38.7956959027553,6")
fk5;-circle(114.75258097762,-38.8018595533485,6")
fk5;-circle(114.748433021092,-38.8033704675111,6")
fk5;-circle(114.752010775846,-38.7933787315656,6")
Region file: 904394_579943712_190519d16h46m10s716537usUT_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(114.76758,-38.80539,8")
Region file: 904394_579943712_190519d16h46m10s716537usUT_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(114.76758,-38.80539,25")
fk5;-circle(114.76758,-38.80539,15")
fk5;-circle(114.767038104925,-38.7986568350451,6")
image paragraph message for exposure 1 of trigger 904394
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 GRB190519 (Swift/BAT trigger 904394) at 07:25:39 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
150 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.
Results from the list of sources generated on-board are not available at this
time. No correction has been made for the expected extinction corresponding to
E(B-V) of 0.42.
------- notes for trigger 904394 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190519d16h46m15s221058usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=904394
-expid=579943712 -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/904394/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 579943712.80246 or about 2019:139:07:28:27 UT
No information found about the number of stars in the star catalog for srclist
region.
Found 13 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
19.73 mag. Found 231 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 28% of the Genie image region.
Genie image analysis:
Found 60381.3 counts in the large background region of 5644.0 pixels or a rate
of 10.698 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 19.22 mag. for a
4-arcsec aperture.
Found 2217.7 counts in the XRT position region of 202.0 pixels or a rate of
10.979 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.309 +/- 0.203 (1-sigma) cps or
19.66 mag and a range from 19.11 to 20.82 mag. The 3-sigma UL at the XRT
position is 0.919 cps or 18.47 mag.
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 114.7705 dec= -38.8062 mag=19.11 sep=8.66". The closest Genie
source has ra= 114.7705 dec= -38.8062 mag=19.11 sep=8.66".
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
150 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 07:39:04.92 = 114.77050
DEC(J2000) = -38:48:22.2 = -38.80618
with a 90%-confidence error radius of about 0.80 arc sec. This position is 8.66
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.11 with a 1-sigma error of about 0.22. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.42.
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?
579943712 149 U srclist data are not available.
579943712 149 U image found no candidates.
List afterglow candidates for other finding charts.
579944416 853 U srclist found no candidates.
579944416 853 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -38.80539
GRB_ERROR: 5
GRB_RA: 114.76758
IMAGE_START_TIME: 07:28:27
MAGNITUDE: 18.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT