image overlap message for exposure 2 of trigger 808755
uvot_overlap.pl vrs. 2010-12-20b fem started at 180205d19h47m43s317140usUT
The observation of trigger 808755 started 2018-02-05T19:41:48.9
Examining file 808755_g876_uvot_sky_image.fits
The exposure ID is 539552508
The exposure time is 149.857 (seconds)
The filter is U.
The uvot region is centered at (251.7542,-45.8480) with a roll angle of 85.3
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 (251.7490,-45.8500) with a radius of 3.000 arc min
This is 0.248 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 (251.7923,-45.8713) with a radius of 0.035 arc min
This is 2.116 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 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 2 of trigger 808755
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180205d19h47m44s109263usUT
Observation start time is 2018-02-05T19:41:48.9
Examining file 808755_g876_uvot_catalog_image.fits
The exposure ID is 539552508
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is U
There are 21 detected source(s) for 808755_g876
Aspect correction adds 0.00084 degrees (0.201 sec of time = 2.10 arc sec) to RA
Aspect correction adds 0.00063 degrees ( 2.26 arcsec) to Dec
Total aspect correction is 3.09 arcsec
Star catalogs centered at 251.7534 , -45.8440 with radius 2.66 arc min.
n_usno: 416 n_gsc: 982
*** WARNING -- bright star catalog has 5 entries brighter than 12 mag
The brightest has mag 10.545
RA DEC Mag Color
bright star 0: 251.76442 (16:47:03.46) -45.84649 (-45:50:47.4) 11.22 USNO-R
bright star 1: 251.75658 (16:47:01.58) -45.86180 (-45:51:42.5) 10.54 USNO-R
bright star 2: 251.75587 (16:47:01.41) -45.84358 (-45:50:36.9) 11.96 GSC-F
bright star 3: 251.76324 (16:47:03.18) -45.84789 (-45:50:52.4) 11.88 GSC-F
bright star 4: 251.71933 (16:46:52.64) -45.87579 (-45:52:32.8) 11.93 GSC-F
Mean distance difference (CAT_DELTA) for 19 matched entries is 0.745" for 808755_g876
Mean and std. dev of mag. difference (MAG_DELTA) are 2.570 and 1.247 for 808755_g876
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 808755_g876.
Acceptable entries have no ID, XRT distances < 5.25", 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=251.7490 (16:46:59.76) DEC=-45.8500 (-45:51:00.0)
XRT distances are from RA=251.7923 (16:47:10.15) DEC=-45.8713 (-45:52:16.5)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 808755_g876 with genie
ra=251.74823 (16:46:59.57) dec=-45.84739 (-45:50:50.6) +/- 0.7" mag=18.24+/-0.19
dist=140.0 REFID=13 major=0.9 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 9.6 arc sec from the BAT position.
Found 15 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
251.7525 -45.8480 10.9 -1 USNO-B1 17.77 14.63 16.02
251.7488 -45.8472 1.5 -1 USNO-B1 16.03 13.94 14.87 *
251.7489 -45.8498 8.8 -1 USNO-B1 17.98 16.80 17.33
251.7535 -45.8506 17.6 -1 USNO-B1 99.99 17.26 99.99
251.7419 -45.8449 18.3 -1 USNO-B1 16.94 15.76 16.28
251.7513 -45.8453 10.9 -1 GSC2.3 17.91 21.57 99.99
251.7475 -45.8438 13.2 -1 GSC2.3 17.59 99.99 99.99
251.7524 -45.8482 10.8 -1 GSC2.3 14.93 18.57 99.99
251.7483 -45.8473 0.4 -1 GSC2.3 13.74 16.39 99.99 *
251.7531 -45.8505 16.7 -1 GSC2.3 17.39 99.99 99.99
251.7486 -45.8498 8.8 -1 GSC2.3 16.76 18.95 99.99
251.7462 -45.8497 9.9 -1 GSC2.3 17.99 99.99 99.99
251.7427 -45.8472 13.9 -1 GSC2.3 99.99 21.49 99.99
251.7417 -45.8449 18.5 -1 GSC2.3 15.99 17.63 99.99
251.7426 -45.8491 15.5 -1 GSC2.3 17.82 99.99 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 1 in the list of sources is a candidate afterglow for 808755_g876 with genie
ra=251.75398 (16:47:00.96) dec=-45.85422 (-45:51:15.2) +/- 0.7" mag=17.96+/-0.17
dist=113.9 REFID=15 major=0.9 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 19.7 arc sec from the BAT position.
Found 13 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
251.7535 -45.8506 12.9 -1 USNO-B1 99.99 17.26 99.99
251.7537 -45.8536 2.3 -1 USNO-B1 15.82 12.62 14.04 *
251.7603 -45.8529 16.5 -1 USNO-B1 18.92 12.72 15.47
251.7518 -45.8587 17.0 -1 USNO-B1 19.74 16.24 17.79
251.7563 -45.8594 19.5 -1 USNO-B1 18.82 14.89 16.63
251.7531 -45.8505 13.5 -1 GSC2.3 17.39 99.99 99.99
251.7567 -45.8505 15.1 -1 GSC2.3 99.99 21.01 99.99
251.7506 -45.8527 10.1 -1 GSC2.3 17.46 99.99 99.99
251.7536 -45.8539 1.3 -1 GSC2.3 13.74 16.21 99.99 *
251.7601 -45.8532 15.9 -1 GSC2.3 13.91 19.44 99.99
251.7495 -45.8572 15.4 -1 GSC2.3 17.63 99.99 99.99
251.7583 -45.8577 16.6 -1 GSC2.3 14.80 20.76 99.99
251.7514 -45.8588 17.7 -1 GSC2.3 16.63 21.50 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
Found 6 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
251.7889 -45.8700 9.7 -1 USNO-B1 18.89 17.82 18.30
251.7934 -45.8697 6.2 -1 USNO-B1 16.71 14.81 15.65
251.7951 -45.8705 7.5 -1 USNO-B1 18.83 17.64 18.17
251.7888 -45.8700 9.9 -1 GSC2.3 17.86 20.09 99.99
251.7926 -45.8702 3.9 -1 GSC2.3 15.80 17.71 99.99
251.7950 -45.8706 7.3 -1 GSC2.3 18.27 20.26 99.99
The closest star is 3.87" away.
List UVOT sources within 10" of the XRT position:
There are 43388.340 counts in the bkg source region of 5762.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.530 counts/pixel (5-sig UL in 4" is 18.81 mag) for 808755_g876
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 19.37, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 808755_539552508_180205d19h47m44s109263usUT_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(251.7542,-45.8480,45")
fk5;-circle(251.748225754813,-45.8473922566695,6")
fk5;-circle(251.753984928688,-45.8542183678754,6")
fk5;-circle(251.756068914084,-45.8437876439638,6")
fk5;-circle(251.738804530025,-45.8437531667876,6")
fk5;-circle(251.737119481769,-45.8554282372349,6")
fk5;-circle(251.753015357538,-45.83912329669,6")
image paragraph message for exposure 2 of trigger 808755
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 GRB180205 (Swift/BAT trigger 808755) at 19:27:11 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the U filter starting
856 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 808755 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180205d19h47m45s133908usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=808755
-expid=539552508 -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/808755/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction 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 539552508.9418 or about 2018:036:19:41:43 UT
Found 4688 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 43% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 64 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 21 source(s) in Genie image catalog. Found 2 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.37 mag. Found 590 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
57% of the Genie image region.
Genie image analysis:
Found 43388.3 counts in the large background region of 5762.0 pixels or a rate
of 7.530 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 18.85 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 18.21 mag. The closest srclist
source has ra= 251.7944 dec= -45.8811 mag=18.12 sep=35.82". The closest Genie
source has ra= 251.7779 dec= -45.8593 mag=17.48 sep=56.18".
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?
539552508 855 U srclist found no candidates.
539552508 855 U image found no candidates.
List afterglow candidates for other finding charts.
539551752 99 U srclist found no candidates.
539551752 99 U image found no candidates.
------- Tokens for Quick GCN -------