srclist overlap message for exposure 1 of trigger 842475


uvot_overlap.pl vrs. 2010-12-20b fem started at 180618d03h28m37s640984usUT

The observation of trigger 842475 started 2018-06-18T00:45:00.1
Examining file ./842475_g107_uvot_sky_srclist.fits
The exposure ID is 550975500
The exposure time is undefined.
The filter is WHITE.

The uvot region is centered at (169.9236,73.8486) with a roll angle of 270.5
It is square with sides of 8.03 arc min. for an area of 64.51 sq arc min

The BAT error circle is centered at (169.9370,73.8480) with a radius of 3.000 arc min
This is 0.226 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 28.27 sq. arc min or 1.00 of the BAT error circle

The XRT error circle is centered at (169.9414,73.8373) with a radius of 0.028 arc min
This is 0.741 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle



srclist afterglow message for exposure 1 of trigger 842475


find_uvot_ag.pl vrs. 2017-02-17 fem started at 180618d03h28m39s332340usUT

Observation start time is 2018-06-18T00:45:00.1
Examining file ./842475_g107_uvot_catalog_srclist.fits
The exposure ID is 550975500
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 21 detected source(s) for 842475_g107
Aspect correction adds 0.00022 degrees (0.054 sec of time = 0.22 arc sec) to RA
Aspect correction adds 0.00043 degrees ( 1.54 arcsec) to Dec
Total aspect correction is 1.56 arcsec
Star catalogs centered at 169.9512 , 73.8494 with radius 5.76 arc min.
n_usno: 158 n_gsc: 164
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 19 matched entries is 0.415" for 842475_g107
Mean and std. dev of mag. difference (MAG_DELTA) are 0.842 and 0.288 for 842475_g107
Found 2 entries without IDs and 1 entries that are acceptable afterglow candidates for 842475_g107.
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=169.9370 (11:19:44.88) DEC=73.8480 (+73:50:52.8)
XRT distances are from RA=169.9414 (11:19:45.94) DEC=73.8373 (+73:50:14.3)

-----------------
Entry 0 in the list of sources is a candidate afterglow for 842475_g107 with 5x5 stamp
 ra=169.94074 (11:19:45.78) dec=73.83704 (+73:50:13.3) +/- 1.1" mag=17.81+/-0.35
 dist=1.2 REFID=11
 src: 0 distr. of nearby unmatched sources: 0 0 0 0 0 
Found 3 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 
  169.9339  73.8383   8.2    -1 USNO-B1  21.52  19.59  20.45
  169.9301  73.8381  11.4    -1 USNO-B1  20.66  99.99  99.99
  169.9342  73.8382   7.9    -1 GSC2.3   99.99  21.43  99.99
##### This source remains a candidate #####
    It has no entries within 4" or brighter than 13 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
169.9339 73.8383 8.3 -1 USNO-B1 21.52 19.59 20.45
169.9342 73.8382 8.0 -1 GSC2.3 99.99 21.43 99.99
The closest star is 7.98" away.

List UVOT sources within 10" of the XRT position:
Unmatched source ra=169.94074 (11:19:45.78) dec=73.83704 (+73:50:13.3) +/- 1.1" mag=17.81+/-0.35 dist=1.2 REFID=11

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 19.22, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.

SUMMARY: 1 good candidate(s) found.



srclist paragraph message for exposure 1 of trigger 842475


IMAGE PROBLEM: incomplete image,

------ Start for Possible Stand-alone Circular ----

In response to GRB180618 (Swift/BAT trigger 842475) at 00:43:12 UT,

---- UVOT paragraph for Joint or Stand-alone Circular ----

UVOT took a finding chart exposure of 150 seconds with the White filter
starting 86 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 11:19:45.78 = 169.94074
DEC(J2000) = +73:50:13.3 = 73.83704
with a 90%-confidence error radius of about 1.10 arc sec. This position is 1.2
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.81. No correction has been made for the expected extinction corresponding to
E(B-V) of 0.07.

------- notes for trigger 842475 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180618d03h28m43s105971usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=842475
-expid=550975500 -meonly -msg_srclist
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/842475/
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 550975500.11282 or about 2018:169:00:44:55 UT

Found 164 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 21 sources in
srclist catalog. Found 2 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.

Found 6 source(s) in Genie image catalog. Found 6 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 19.42 mag. Found 26 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 3% of the
Genie image region. The Genie image is INCOMPLETE with 24134 null pixels.
The closest Genie source has ra= 169.8858 dec= 73.8195 mag=21.46 sep=84.88".

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?
550975500   85 WHITE 169.94074	73.83704  17.81/19.2	1.2  srclist  Yes
550975500   85 WHITE image found no candidates.
List afterglow candidates for other finding charts.
550975712  297 U     169.94069	73.83696  17.89/18.1	1.9  srclist  Yes
550975712  297 U     169.94103	73.83700  17.39/20.6	2.2  image    Yes

------- Tokens for Quick GCN -------

CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: 73.83704
GRB_ERROR: 1.10
GRB_RA: 169.94074
IMAGE_START_TIME: 00:44:55
MAGNITUDE: 17.81
MAG_ERROR: 0.4
MESSAGE_TYPE: ACK
SOURCE: XRT