image overlap message for exposure 1 of trigger 852553
uvot_overlap.pl vrs. 2010-12-20b fem started at 180810d20h41m10s290663usUT
The observation of trigger 852553 started 2018-08-09T20:30:31.2
Examining file ./852553_g102_uvot_sky_image.fits
The exposure ID is 555539431
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (299.6955,-15.2994) with a roll angle of 273.8
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 (299.7117,-15.2928) with a radius of 1.000 arc min
This is 1.017 arc min from the center of the uvot region
The area of the BAT error circle is 3.14 sq. arc min
The UVOT/BAT overlap is 2.33 sq. arc min or 0.74 of the BAT error circle
The XRT error circle is centered at (299.7000,-15.2989) with a radius of 0.023 arc min
This is 0.261 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 852553
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180810d20h41m13s871615usUT
Observation start time is 2018-08-09T20:30:31.2
Examining file ./852553_g102_uvot_catalog_image.fits
The exposure ID is 555539431
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 26 detected source(s) for 852553_g102
Aspect correction adds -0.00141 degrees (-0.337 sec of time = -4.88 arc sec) to RA
Aspect correction adds 0.00038 degrees ( 1.37 arcsec) to Dec
Total aspect correction is 5.07 arcsec
Star catalogs centered at 299.6978 , -15.2991 with radius 2.75 arc min.
n_usno: 181 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 25 matched entries is 0.533" for 852553_g102
Mean and std. dev of mag. difference (MAG_DELTA) are 0.742 and 0.728 for 852553_g102
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 852553_g102.
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=299.7117 (19:58:50.80) DEC=-15.2928 (-15:17:34.0)
XRT distances are from RA=299.7000 (19:58:47.99) DEC=-15.2989 (-15:17:56.1)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 852553_g102 with genie
ra=299.69983 (19:58:47.96) dec=-15.29915 (-15:17:56.9) +/- 0.6" mag=18.91+/-0.15
dist=0.9 REFID=15 major=1.0 minor=0.9 flag=0
Found 1 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
299.7038 -15.2980 14.4 -1 USNO-B1 20.67 19.47 20.00
uvot_check_outside found 12 of 12 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 21 in the list of sources is a candidate afterglow for 852553_g102 with genie
ra=299.68876 (19:58:45.30) dec=-15.32096 (-15:19:15.5) +/- 0.7" mag=19.90+/-0.19
dist=88.4 REFID=26 major=1.1 minor=0.6 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 128.9 arc sec from the BAT position.
This source is near the edge of image (0.989)
Found 3 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
299.6867 -15.3170 16.0 -1 USNO-B1 16.49 15.38 15.88
299.6838 -15.3198 17.8 -1 USNO-B1 20.51 18.52 19.40
299.6887 -15.3224 5.2 -1 USNO-B1 16.80 15.65 16.16 *
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 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=299.69983 (19:58:47.96) dec=-15.29915 (-15:17:56.9) +/- 0.6" mag=18.91+/-0.15 dist=0.9 REFID=15 flag=0
There are 71298.641 counts in the bkg source region of 5982.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 11.919 counts/pixel (5-sig UL in 4" is 20.00 mag) for 852553_g102
There are 986.42755 counts in the src source region of 52.000000 pixels.
Rate in src region with 4 arcsec radius is 18.970 counts/pixel for 852553_g102
There are 14912.498 counts in the cand_src_bkg source region of 1250.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 11.930 counts/pixel (5-sig UL in 4" is 20.00 mag) for 852553_g102
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 20.56, 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: 852553_555539431_180810d20h41m13s871615usUT_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(299.6955,-15.2994,45")
fk5;-circle(299.699834350875,-15.2991507766796,6")
fk5;-circle(299.687606419179,-15.299826941179,6")
fk5;-circle(299.690619309814,-15.2909889011554,6")
Region file: 852553_555539431_180810d20h41m13s871615usUT_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(299.699834350875,-15.2991507766796,4")
Region file: 852553_555539431_180810d20h41m13s871615usUT_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(299.699834350875,-15.2991507766796,25")
fk5;-circle(299.699834350875,-15.2991507766796,15")
image paragraph message for exposure 1 of trigger 852553
------ Start for Possible Stand-alone Circular ----
In response to GRB180809 (Swift/BAT trigger 852553) at 20:28:48 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 81 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 19:58:47.96 = 299.69983
DEC(J2000) = -15:17:56.9 = -15.29915
with a 90%-confidence error radius of about 0.64 arc sec. This position is 0.9
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.91 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.16.
------- notes for trigger 852553 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180810d20h41m16s564782usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=852553
-expid=555539431 -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/852553/
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 555539431.24142 or about 2018:221:20:30:26 UT
Found 875 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 15% of the srclist region. Found 140 sources in
srclist catalog. Found 13 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 26 source(s) in Genie image catalog. 1 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
20.56 mag. Found 177 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 16% of the Genie image region.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 299.6998 dec= -15.2993 mag=19.27 sep=1.36".
The closest srclist source has ra= 299.6998 dec= -15.2993 mag=19.27 sep=1.36".
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?
555539431 81 WHITE 299.69979 -15.29926 19.27/19.2 1.4 srclist Yes
555539431 81 WHITE 299.69983 -15.29915 18.91/20.6 0.9 image Yes
List afterglow candidates for other finding charts.
555539643 293 U srclist found no candidates.
555539643 293 U image found no candidates.
555540220 870 WHITE srclist found no candidates.
555540220 870 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -15.29915
GRB_ERROR: 0.64
GRB_RA: 299.69983
IMAGE_START_TIME: 20:30:26
MAGNITUDE: 18.91
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT