image overlap message for exposure 2 of trigger 843211
uvot_overlap.pl vrs. 2010-12-20b fem started at 180621d01h17m31s395009usUT
The observation of trigger 843211 started 2018-06-20T15:56:02.1
Examining file ./843211_g324_uvot_sky_image.fits
The exposure ID is 551202962
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (357.5241,-57.9616) with a roll angle of 78.4
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 (357.5170,-57.9570) with a radius of 3.000 arc min
This is 0.354 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 (357.5212,-57.9624) with a radius of 0.023 arc min
This is 0.105 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 843211
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180621d01h17m49s937894usUT
Observation start time is 2018-06-20T15:56:02.1
Examining file ./843211_g324_uvot_catalog_image.fits
The exposure ID is 551202962
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 3 detected source(s) for 843211_g324
Aspect correction adds -0.00043 degrees (-0.102 sec of time = -0.81 arc sec) to RA
Aspect correction adds 0.00036 degrees ( 1.30 arcsec) to Dec
Total aspect correction is 1.54 arcsec
Star catalogs centered at 357.5273 , -57.9648 with radius 2.33 arc min.
n_usno: 53 n_gsc: 41
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.932
RA DEC Mag Color
bright star 0: 357.49915 (23:49:59.79) -57.99294 (-57:59:34.6) 11.93 GSC-F
Mean distance difference (CAT_DELTA) for 2 matched entries is 0.204" for 843211_g324
Mean and std. dev of mag. difference (MAG_DELTA) are -0.154 and 0.268 for 843211_g324
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 843211_g324.
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=357.5170 (23:50:04.08) DEC=-57.9570 (-57:57:25.2)
XRT distances are from RA=357.5212 (23:50:05.09) DEC=-57.9624 (-57:57:44.8)
*** WARNING 33 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 843211_g324 with genie
ra=357.52122 (23:50:05.09) dec=-57.96215 (-57:57:43.7) +/- 0.8" mag=17.28+/-0.15
dist=1.0 REFID=3 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
357.5215 -57.9663 14.8 -1 USNO-B1 99.99 24.07 99.99
uvot_check_outside found 11 of 11 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" 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=357.52122 (23:50:05.09) dec=-57.96215 (-57:57:43.7) +/- 0.8" mag=17.28+/-0.15 dist=1.0 REFID=3 flag=0
There are 31542.445 counts in the bkg source region of 6082.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.186 counts/pixel (5-sig UL in 4" is 19.57 mag) for 843211_g324
There are 749.65326 counts in the src source region of 47.000000 pixels.
Rate in src region with 4 arcsec radius is 15.950 counts/pixel for 843211_g324
There are 6355.0049 counts in the cand_src_bkg source region of 1246.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 5.100 counts/pixel (5-sig UL in 4" is 19.58 mag) for 843211_g324
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 20.13, 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: 843211_551202962_180621d01h17m49s937894usUT_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(357.5241,-57.9616,45")
fk5;-circle(357.521220905093,-57.9621485400135,6")
fk5;-circle(357.503103081563,-57.9614143213653,6")
Region file: 843211_551202962_180621d01h17m49s937894usUT_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(357.521220905093,-57.9621485400135,4")
Region file: 843211_551202962_180621d01h17m49s937894usUT_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(357.521220905093,-57.9621485400135,25")
fk5;-circle(357.521220905093,-57.9621485400135,15")
image paragraph message for exposure 2 of trigger 843211
------ Start for Possible Stand-alone Circular ----
In response to GRB180620 (Swift/BAT trigger 843211) at 15:50:37 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
303 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 23:50:05.09 = 357.52122
DEC(J2000) = -57:57:43.7 = -57.96215
with a 90%-confidence error radius of about 0.76 arc sec. This position is 1.0
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.28 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.01.
------- notes for trigger 843211 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180621d01h17m54s450928usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=843211
-expid=551202962 -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/843211/
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 551202962.09938 or about 2018:171:15:55:57 UT
Found 269 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 16 sources in
srclist catalog. Found 4 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 3 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.13 mag. Found 49 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 6% of the Genie image region.
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?
551202962 303 U 357.52114 -57.96212 17.60/18.1 1.2 srclist Yes
551202962 303 U 357.52122 -57.96215 17.28/20.1 1.0 image Yes
List afterglow candidates for other finding charts.
551202750 91 WHITE 357.52114 -57.96218 18.31/19.2 1.0 srclist Yes
551202750 91 WHITE 357.52126 -57.96224 17.98/20.7 0.7 image Yes
551203515 856 WHITE 357.52136 -57.96189 18.22/19.2 3.1 srclist Yes
551203515 856 WHITE 357.52120 -57.96208 17.78/20.0 2.6 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -57.96215
GRB_ERROR: 0.76
GRB_RA: 357.52122
IMAGE_START_TIME: 15:55:57
MAGNITUDE: 17.28
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT