image overlap message for exposure 2 of trigger 887579
uvot_overlap.pl vrs. 2010-12-20b fem started at 190204d13h38m30s851787usUT
The observation of trigger 887579 started 2019-02-04T05:51:18.9
Examining file ./887579_g317_uvot_sky_image.fits
The exposure ID is 570952278
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (351.4772,54.8739) with a roll angle of 213.4
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 (351.5340,54.8830) with a radius of 3.000 arc min
This is 2.034 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 5.93 sq. arc min or 0.21 of the BAT error circle
The XRT error circle is centered at (351.4782,54.8764) with a radius of 0.025 arc min
This is 0.151 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 2 of trigger 887579
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190204d13h38m55s048455usUT
Observation start time is 2019-02-04T05:51:18.9
Examining file ./887579_g317_uvot_catalog_image.fits
The exposure ID is 570952278
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 40 detected source(s) for 887579_g317
Aspect correction adds 0.00044 degrees (0.106 sec of time = 0.92 arc sec) to RA
Aspect correction adds -0.00061 degrees (-2.19 arcsec) to Dec
Total aspect correction is 2.38 arcsec
Star catalogs centered at 351.4748 , 54.8736 with radius 2.65 arc min.
n_usno: 337 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.71
RA DEC Mag Color
bright star 0: 351.47225 (23:25:53.34) 54.88890 (+54:53:20.0) 11.71 USNO-R
Mean distance difference (CAT_DELTA) for 43 matched entries is 0.579" for 887579_g317
Mean and std. dev of mag. difference (MAG_DELTA) are 1.218 and 0.702 for 887579_g317
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 887579_g317.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=351.5340 (23:26:08.16) DEC=54.8830 (+54:52:58.8)
XRT distances are from RA=351.4782 (23:25:54.77) DEC=54.8764 (+54:52:34.9)
-----------------
Entry 1 in the list of sources is a candidate afterglow for 887579_g317 with genie
ra=351.47742 (23:25:54.58) dec=54.87637 (+54:52:34.9) +/- 0.6" mag=17.76+/-0.15
dist=1.6 REFID=23 major=1.1 minor=1.0 flag=3 (neighbor+blended)
Found 5 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
351.4788 54.8718 16.7 -1 USNO-B1 18.76 17.98 18.33
351.4709 54.8758 13.6 -1 USNO-B1 20.39 18.55 19.37
351.4785 54.8713 18.3 -1 USNO-B1 99.99 18.60 99.99
351.4756 54.8774 5.2 -1 USNO-B1 17.64 16.75 17.15
351.4800 54.8771 6.1 -1 USNO-B1 19.90 18.66 19.21
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 31 in the list of sources is a candidate afterglow for 887579_g317 with genie
ra=351.51099 (23:26:02.64) dec=54.88231 (+54:52:56.3) +/- 0.6" mag=17.54+/-0.15
dist=71.2 REFID=17 major=0.9 minor=0.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 47.7 arc sec from the BAT position.
This source is near the edge of image (0.984)
Found 9 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
351.5032 54.8848 18.5 -1 USNO-B1 16.39 15.72 16.02
351.5043 54.8843 15.5 -1 USNO-B1 17.42 15.88 16.57
351.5051 54.8840 13.6 -1 USNO-B1 16.94 15.80 16.31
351.5122 54.8768 19.9 -1 USNO-B1 18.10 16.87 17.42
351.5120 54.8829 3.0 -1 USNO-B1 15.12 13.53 14.23 *
351.5149 54.8796 12.7 -1 USNO-B1 18.00 16.61 17.23
351.5181 54.8808 15.6 -1 USNO-B1 20.60 19.58 20.03
351.5135 54.8875 19.3 -1 USNO-B1 16.99 15.82 16.34
351.5188 54.8838 17.0 -1 USNO-B1 20.15 18.88 19.44
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
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
351.4756 54.8774 6.6 -1 USNO-B1 17.64 16.75 17.15
351.4800 54.8771 4.7 -1 USNO-B1 19.90 18.66 19.21
The closest star is 4.66" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=351.47553 (23:25:54.13) dec=54.87737 (+54:52:38.5) +/- 0.6" mag=17.74+/-0.15 dist=6.6 REFID=22 flag=3
Unmatched source ra=351.47742 (23:25:54.58) dec=54.87637 (+54:52:34.9) +/- 0.6" mag=17.76+/-0.15 dist=1.6 REFID=23 flag=3
There are 21093.930 counts in the bkg source region of 5440.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.878 counts/pixel (5-sig UL in 4" is 19.73 mag) for 887579_g317
There are 585.36926 counts in the src source region of 51.000000 pixels.
Rate in src region with 4 arcsec radius is 11.478 counts/pixel for 887579_g317
There are 4483.5229 counts in the cand_src_bkg source region of 1156.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 3.878 counts/pixel (5-sig UL in 4" is 19.73 mag) for 887579_g317
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 20.28, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 887579_570952278_190204d13h38m55s048455usUT_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(351.4772,54.8739,45")
fk5;-circle(351.475526031652,54.8773679721842,6")
fk5;-circle(351.47741799265,54.8763650633628,6")
fk5;-circle(351.478798023925,54.871883431609,6")
fk5;-circle(351.491200547106,54.8762007314532,6")
fk5;-circle(351.475559364369,54.8869262504231,6")
fk5;-circle(351.49247178367,54.8796041704932,6")
fk5;-circle(351.469930108808,54.8862606491323,6")
fk5;-circle(351.480641534604,54.8870968232043,6")
fk5;-circle(351.460181967025,54.8817505416859,6")
fk5;-circle(351.496925990801,54.8743404566646,6")
fk5;-circle(351.491670390896,54.8691594142978,6")
fk5;-circle(351.498718985195,54.8791631572997,6")
Region file: 887579_570952278_190204d13h38m55s048455usUT_cand_src.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(351.47741799265,54.8763650633628,4")
Region file: 887579_570952278_190204d13h38m55s048455usUT_cand_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(351.47741799265,54.8763650633628,25")
fk5;-circle(351.47741799265,54.8763650633628,15")
fk5;-circle(351.478798023925,54.871883431609,6")
fk5;-circle(351.491200547106,54.8762007314532,6")
image paragraph message for exposure 2 of trigger 887579
Catalogued source 4.7" from XRT position may affect AG photometry.
------ Start for Possible Stand-alone Circular ----
In response to GRB190204 (Swift/BAT trigger 887579) at 05:46:00 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
295 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 23:25:54.58 = 351.47742
DEC(J2000) = +54:52:34.9 = 54.87637
with a 90%-confidence error radius of about 0.63 arc sec. This position is 1.6
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.76 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.38.
------- notes for trigger 887579 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190204d13h39m00s196313usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=887579
-expid=570952278 -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/887579/
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 570952278.94334 or about 2019:035:05:51:13 UT
Found 1814 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 31% of the srclist region. Found 176 sources in
srclist catalog. Found 12 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 40 source(s) in Genie image catalog. 2 source(s) are within 10.0" of the
xrt position. Found 2 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.28 mag. Found 333 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 32% of the Genie image region.
Found 2 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 351.4777 dec= 54.8763 mag=18.21 sep=1.02".
The closest srclist source has ra= 351.4777 dec= 54.8763 mag=18.21 sep=1.02".
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?
570952278 294 U 351.47772 54.87631 18.21/18.1 1.0 srclist Yes
570952278 294 U 351.47742 54.87637 17.76/20.3 1.6 image Yes
List afterglow candidates for other finding charts.
570952066 82 WHITE 351.47704 54.87647 17.71/19.2 2.5 srclist Yes
570952066 82 WHITE image found no candidates.
570952857 873 WHITE srclist found no candidates.
570952857 873 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 54.87637
GRB_ERROR: 0.63
GRB_RA: 351.47742
IMAGE_START_TIME: 05:51:13
MAGNITUDE: 17.76
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT