image overlap message for exposure 3 of trigger 1004219
uvot_overlap.pl vrs. 2010-12-20b fem started at 201105d02h47m02s832028usUT
The observation of trigger 1004219 started 2020-11-05T02:36:54.2
Examining file 1004219_g890_uvot_sky_image.fits
The exposure ID is 626236614
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (277.6751,-6.7568) with a roll angle of 255.5
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 (277.6790,-6.7540) with a radius of 3.000 arc min
This is 0.290 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 (277.6736,-6.7549) with a radius of 0.038 arc min
This is 0.145 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 3 of trigger 1004219
find_uvot_ag.pl vrs. 2020-10-30 fem started at 201105d02h47m04s234719usUT
Observation start time is 2020-11-05T02:36:54.2
Examining file 1004219_g890_uvot_catalog_image.fits
The exposure ID is 626236614
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 42 detected source(s) for 1004219_g890
Aspect correction adds 0.00002 degrees (0.005 sec of time = 0.08 arc sec) to RA
Aspect correction adds -0.00072 degrees (-2.59 arcsec) to Dec
Total aspect correction is 2.59 arcsec
Star catalogs centered at 277.6762 , -6.7568 with radius 2.72 arc min.
n_usno: 611 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 43 matched entries is 0.702" for 1004219_g890
Mean and std. dev of mag. difference (MAG_DELTA) are 1.812 and 0.670 for 1004219_g890
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1004219_g890.
Acceptable entries have no ID, XRT distances < 5.75", 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=277.6790 (18:30:42.96) DEC=-6.7540 (-06:45:14.4)
XRT distances are from RA=277.6736 (18:30:41.66) DEC=-6.7549 (-06:45:17.6)
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1004219_g890 with genie
ra=277.67385 (18:30:41.72) dec=-6.75319 (-06:45:11.5) +/- 0.6" mag=15.99+/-0.14
dist=6.2 REFID=18 major=1.1 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 18.6 arc sec from the BAT position.
Found 8 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
277.6770 -6.7571 18.0 -1 USNO-B1 19.23 16.98 17.98
277.6734 -6.7575 15.4 -1 USNO-B1 16.32 14.69 15.41
277.6734 -6.7536 2.1 -1 USNO-B1 15.05 13.09 13.96 *
277.6769 -6.7520 11.8 -1 USNO-B1 19.09 16.06 17.41
277.6715 -6.7516 10.1 -1 USNO-B1 19.07 16.75 17.78
277.6696 -6.7529 15.2 -1 USNO-B1 18.20 15.30 16.59
277.6694 -6.7519 16.5 -1 USNO-B1 99.99 17.14 99.99
277.6710 -6.7502 15.0 -1 USNO-B1 17.08 14.48 15.64
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 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
277.6734 -6.7575 9.2 -1 USNO-B1 16.32 14.69 15.41
277.6734 -6.7536 4.7 -1 USNO-B1 15.05 13.09 13.96
The closest star is 4.70" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=277.67385 (18:30:41.72) dec=-6.75319 (-06:45:11.5) +/- 0.6" mag=15.99+/-0.14 dist=6.2 REFID=18 flag=0
Matched source ra=277.67338 (18:30:41.61) dec=-6.75762 (-06:45:27.4) +/- 0.6" mag=16.82+/-0.14 dist=9.8 REFID=23 flag=0
There are 1.1051741E+05 counts in the bkg source region of 4975.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 22.215 counts/pixel (5-sig UL in 4" is 19.67 mag) for 1004219_g890
There are 8429.6689 counts in the xrt source region of 202.00000 pixels.
Rate in xrt region with 8 arcsec radius is 41.731 counts/pixel for 1004219_g890
There are 20018.094 counts in the xrt_bkg source region of 900.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 22.242 counts/pixel (5-sig UL in 4" is 19.67 mag) for 1004219_g890
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 20.22, XRT distances < 5.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1004219_626236614_201105d02h47m04s234719usUT_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(277.6751,-6.7568,45")
fk5;-circle(277.679643642832,-6.75746721680064,6")
fk5;-circle(277.68295581871,-6.75353530210332,6")
fk5;-circle(277.673849027392,-6.75319421548754,6")
fk5;-circle(277.673378413058,-6.75762396329169,6")
fk5;-circle(277.678162620852,-6.76102605767215,6")
fk5;-circle(277.685762799234,-6.75169538138828,6")
fk5;-circle(277.670965033991,-6.74980139402764,6")
fk5;-circle(277.669611238355,-6.7528949257597,6")
fk5;-circle(277.686614595876,-6.76061552278624,6")
fk5;-circle(277.668465714065,-6.75881707395772,6")
fk5;-circle(277.672277083443,-6.76370654313828,6")
fk5;-circle(277.671575403693,-6.76670001808997,6")
fk5;-circle(277.66753196663,-6.76691760403308,6")
fk5;-circle(277.665501621296,-6.76596986690072,6")
Region file: 1004219_626236614_201105d02h47m04s234719usUT_xrt.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(277.6736,-6.7549,8")
Region file: 1004219_626236614_201105d02h47m04s234719usUT_xrt_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(277.6736,-6.7549,25")
fk5;-circle(277.6736,-6.7549,15")
fk5;-circle(277.679643642832,-6.75746721680064,6")
fk5;-circle(277.673378413058,-6.75762396329169,6")
fk5;-circle(277.678162620852,-6.76102605767215,6")
fk5;-circle(277.670965033991,-6.74980139402764,6")
fk5;-circle(277.669611238355,-6.7528949257597,6")
fk5;-circle(277.668465714065,-6.75881707395772,6")
image paragraph message for exposure 3 of trigger 1004219
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: high density of stars
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.
2 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB201105 (Swift/BAT trigger 1004219) at 02:22:03 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 865 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 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
sub-image. 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 1004219 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 201105d02h47m06s581639usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1004219
-expid=626236614 -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/1004219/
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 626236614.24782 or about 2020:310:02:36:49 UT
Found 4817 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 50% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 16 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 42 source(s) in Genie image catalog. 2 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.22 mag. Found 607 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 56% of the Genie image region.
Genie image analysis:
Found 110517.4 counts in the large background region of 4975.0 pixels or a rate
of 22.215 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 19.49 mag. for a
4-arcsec aperture.
Found 8429.7 counts in the XRT position region of 202.0 pixels or a rate of
41.731 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 26.245 +/- 0.648 (1-sigma) cps or
16.05 mag and a range from 16.03 to 16.08 mag. The 3-sigma UL at the XRT
position is 28.188 cps or 15.98 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.58 mag.
Found 2 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 277.6739 dec= -6.7531 mag=16.93 sep=6.41".
The closest srclist source has ra= 277.6739 dec= -6.7531 mag=16.93 sep=6.41".
Found 2 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 277.6739 dec= -6.7532 mag=15.99 sep=6.21". The closest Genie
source has ra= 277.6739 dec= -6.7532 mag=15.99 sep=6.21".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 865 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:30:41.72 = 277.67385
DEC(J2000) = -06:45:11.5 = -6.75319
with a 90%-confidence error radius of about 0.61 arc sec. This position is 6.21
arc sec. from the center of the XRT error circle. The estimated magnitude is
15.99 with a 1-sigma error of about 0.14. No correction has been made for the
large, but uncertain, extinction expected.
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?
626236614 864 WHITE srclist found no candidates.
626236614 864 WHITE image found no candidates.
List afterglow candidates for other finding charts.
626235846 96 WHITE srclist found no candidates.
626235846 96 WHITE image found no candidates.
626236058 308 U srclist found no candidates.
626236058 308 U image found no candidates.
------- Tokens for Quick GCN -------