image overlap message for exposure 1 of trigger 848932
uvot_overlap.pl vrs. 2010-12-20b fem started at 180721d03h46m58s483009usUT
The observation of trigger 848932 started 2018-07-20T22:25:59.2
Examining file ./848932_g121_uvot_sky_image.fits
The exposure ID is 553818359
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (265.6168,-26.5850) with a roll angle of 266.6
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 (265.6230,-26.5840) with a radius of 3.000 arc min
This is 0.336 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 (265.6356,-26.6290) with a radius of 0.032 arc min
This is 2.825 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 0.000 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 848932
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180721d03h47m06s679951usUT
Observation start time is 2018-07-20T22:25:59.2
Examining file ./848932_g121_uvot_catalog_image.fits
The exposure ID is 553818359
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 40 detected source(s) for 848932_g121
Aspect correction adds -0.00058 degrees (-0.139 sec of time = -1.86 arc sec) to RA
Aspect correction adds 0.00042 degrees ( 1.51 arcsec) to Dec
Total aspect correction is 2.39 arcsec
Star catalogs centered at 265.6189 , -26.5862 with radius 2.62 arc min.
n_usno: 1060 n_gsc: 0
*** WARNING -- XRT position is outside star catalog search region.
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 42 matched entries is 0.861" for 848932_g121
Mean and std. dev of mag. difference (MAG_DELTA) are 1.633 and 1.561 for 848932_g121
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 848932_g121.
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=265.6230 (17:42:29.52) DEC=-26.5840 (-26:35:02.4)
XRT distances are from RA=265.6356 (17:42:32.54) DEC=-26.6290 (-26:37:44.5)
-----------------
Entry 10 in the list of sources is a candidate afterglow for 848932_g121 with genie
ra=265.63222 (17:42:31.73) dec=-26.57565 (-26:34:32.3) +/- 0.7" mag=19.81+/-0.19
dist=192.5 REFID=12 major=1.0 minor=0.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 42.2 arc sec from the BAT position.
Found 13 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
265.6269 -26.5765 17.3 -1 USNO-B1 99.99 16.59 99.99
265.6330 -26.5804 17.4 -1 USNO-B1 99.99 16.29 99.99
265.6303 -26.5765 6.7 -1 USNO-B1 99.99 17.97 99.99
265.6298 -26.5753 7.9 -1 USNO-B1 99.99 17.38 99.99
265.6326 -26.5783 9.4 -1 USNO-B1 19.43 15.13 17.04
265.6317 -26.5752 2.4 -1 USNO-B1 19.73 15.04 17.12 *
265.6316 -26.5745 4.4 -1 USNO-B1 19.28 18.64 18.92
265.6303 -26.5732 10.7 -1 USNO-B1 99.99 17.23 99.99
265.6349 -26.5765 9.0 -1 USNO-B1 99.99 17.06 99.99
265.6357 -26.5762 11.3 -1 USNO-B1 19.52 16.30 17.73
265.6366 -26.5758 14.2 -1 USNO-B1 99.99 17.63 99.99
265.6342 -26.5718 15.2 -1 USNO-B1 99.99 20.12 99.99
265.6367 -26.5742 15.3 -1 USNO-B1 99.99 18.10 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 34 in the list of sources is a candidate afterglow for 848932_g121 with genie
ra=265.60932 (17:42:26.24) dec=-26.56603 (-26:33:57.7) +/- 0.7" mag=19.72+/-0.19
dist=242.1 REFID=5 major=1.1 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 78.3 arc sec from the BAT position.
Found 15 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
265.6115 -26.5701 16.1 -1 USNO-B1 99.99 17.37 99.99
265.6062 -26.5708 19.8 -1 USNO-B1 99.99 21.01 99.99
265.6077 -26.5693 13.0 -1 USNO-B1 19.31 15.78 17.34
265.6072 -26.5694 14.0 -1 USNO-B1 99.99 16.20 99.99
265.6069 -26.5691 13.5 -1 USNO-B1 99.99 17.61 99.99
265.6056 -26.5697 17.9 -1 USNO-B1 19.55 16.60 17.91
265.6120 -26.5659 8.6 -1 USNO-B1 19.03 99.99 99.99
265.6110 -26.5656 5.8 -1 USNO-B1 99.99 14.04 99.99
265.6101 -26.5651 4.1 -1 USNO-B1 99.99 14.23 99.99
265.6034 -26.5674 19.6 -1 USNO-B1 99.99 18.08 99.99
265.6092 -26.5642 6.7 -1 USNO-B1 99.99 19.44 99.99
265.6104 -26.5623 13.7 -1 USNO-B1 17.55 99.99 99.99
265.6109 -26.5618 16.2 -1 USNO-B1 15.87 11.62 13.51 *
265.6112 -26.5609 19.5 -1 USNO-B1 16.18 13.18 14.51
265.6050 -26.5625 18.8 -1 USNO-B1 19.12 16.08 17.43
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 37 in the list of sources is a candidate afterglow for 848932_g121 with genie
ra=265.61193 (17:42:26.86) dec=-26.56138 (-26:33:41.0) +/- 0.6" mag=16.08+/-0.14
dist=255.2 REFID=2 major=0.9 minor=0.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 88.9 arc sec from the BAT position.
This source is near the edge of image (0.857)
Found 17 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
265.6120 -26.5659 16.3 -1 USNO-B1 19.03 99.99 99.99
265.6110 -26.5656 15.3 -1 USNO-B1 99.99 14.04 99.99
265.6101 -26.5651 14.7 -1 USNO-B1 99.99 14.23 99.99
265.6092 -26.5642 13.4 -1 USNO-B1 99.99 19.44 99.99
265.6151 -26.5622 10.6 -1 USNO-B1 99.99 17.75 99.99
265.6104 -26.5623 6.1 -1 USNO-B1 17.55 99.99 99.99
265.6109 -26.5618 3.5 -1 USNO-B1 15.87 11.62 13.51 *
265.6112 -26.5609 3.1 -1 USNO-B1 16.18 13.18 14.51 *
265.6116 -26.5604 3.7 -1 USNO-B1 19.23 99.99 99.99 *
265.6166 -26.5590 17.2 -1 USNO-B1 19.48 18.09 18.70
265.6089 -26.5604 10.3 -1 USNO-B1 19.55 16.27 17.73
265.6078 -26.5593 15.3 -1 USNO-B1 99.99 18.22 99.99
265.6129 -26.5571 15.6 -1 USNO-B1 99.99 17.68 99.99
265.6133 -26.5566 18.0 -1 USNO-B1 99.99 16.58 99.99
265.6137 -26.5565 18.5 -1 USNO-B1 99.99 18.18 99.99
265.6084 -26.5575 18.0 -1 USNO-B1 99.99 19.62 99.99
265.6113 -26.5560 19.5 -1 USNO-B1 99.99 50.00 99.99
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 1 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
265.6340 -26.6275 7.6 -1 USNO-B1 99.99 50.59 99.99
The closest star is 7.59" away.
List UVOT sources within 10" of the XRT position:
There are 94605.094 counts in the bkg source region of 5354.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 17.670 counts/pixel (5-sig UL in 4" is 19.79 mag) for 848932_g121
Do not compute counts in XRT region because position is too far from center.
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 20.35, 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: 848932_553818359_180721d03h47m06s679951usUT_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(265.6168,-26.5850,45")
fk5;-circle(265.622111419673,-26.5831186408507,6")
fk5;-circle(265.628866351962,-26.5803946912528,6")
fk5;-circle(265.615575992518,-26.5801449989158,6")
fk5;-circle(265.611080400601,-26.5862812090149,6")
fk5;-circle(265.61446657093,-26.5750988289623,6")
fk5;-circle(265.608506279586,-26.5818878230021,6")
fk5;-circle(265.615447573122,-26.5969374649863,6")
fk5;-circle(265.605895611702,-26.5821159723495,6")
fk5;-circle(265.603947548177,-26.5863448475223,6")
fk5;-circle(265.6043985658,-26.5790090844011,6")
image paragraph message for exposure 1 of trigger 848932
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no overlap
SRCLIST PROBLEM: high density of stars, srclist filled telemetry buffer
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB180720 (Swift/BAT trigger 848932) at 22:23:57 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 100 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 none of
the XRT error circle. The 8'x8' region for the list of sources generated
on-board covers 100% of the XRT error circle. Because of the density of
catalogued stars, further analysis is required to report an upper limit for any
afterglow in the region. No correction has been made for the large, but
uncertain, extinction expected.
------- notes for trigger 848932 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180721d03h47m09s361545usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=848932
-expid=553818359 -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/848932/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Large extinction of 6.57 found for bat position. Unreliable extinction found
for xrt position. XRT position found for srclist. XRT position found for Genie
image. BAT position found.
UVOT exposure began at MET 553818359.15784 or about 2018:201:22:25:54 UT
Found 4820 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 86% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 21 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 40 source(s) in Genie image catalog. Found 3 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.35 mag. Found 1056 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
106% of the Genie image region. The XRT position was OUTSIDE the star catalog
search region.
Genie image analysis:
Found 94605.1 counts in the large background region of 5354.0 pixels or a rate
of 17.670 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 19.79 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 19.23 mag. The closest srclist
source has ra= 265.6393 dec= -26.6314 mag=19.09 sep=14.79". The closest Genie
source has ra= 265.6264 dec= -26.6111 mag=17.42 sep=71.03".
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?
553818359 100 WHITE srclist found no candidates.
553818359 100 WHITE image found no candidates.
List afterglow candidates for other finding charts.
553818571 312 ? srclist data are not available.
553818571 312 U image found no candidates.
------- Tokens for Quick GCN -------