srclist overlap message for exposure 1 of trigger 994856
uvot_overlap.pl vrs. 2010-12-20b fem started at 200906d21h24m19s245702usUT
The observation of trigger 994856 started 2020-09-06T13:12:46.2
Examining file ./994856_g101_uvot_sky_srclist.fits
The exposure ID is 621090766
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (272.2833,67.8528) with a roll angle of 287.7
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 (272.2930,67.8520) with a radius of 3.000 arc min
This is 0.225 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 (272.2753,67.8800) with a radius of 0.032 arc min
This is 1.642 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 994856
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200906d21h24m24s032034usUT
Observation start time is 2020-09-06T13:12:46.2
Examining file ./994856_g101_uvot_catalog_srclist.fits
The exposure ID is 621090766
The exposure is 149.846 sec.
The bin size is 2 pixels
The filter is WHITE
There are 73 detected source(s) for 994856_g101
Aspect correction adds -0.00326 degrees (-0.783 sec of time = -4.42 arc sec) to RA
Aspect correction adds 0.00102 degrees ( 3.66 arcsec) to Dec
Total aspect correction is 5.74 arcsec
Star catalogs centered at 272.2666 , 67.8531 with radius 6.22 arc min.
n_usno: 634 n_gsc: 0
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.52536
RA DEC Mag Color
bright star 0: 272.19173 (18:08:46.02) 67.77726 (+67:46:38.1) 11.53 USNO-V
bright star 1: 272.50390 (18:10:00.94) 67.89842 (+67:53:54.3) 11.81 USNO-V
Mean distance difference (CAT_DELTA) for 82 matched entries is 0.688" for 994856_g101
Mean and std. dev of mag. difference (MAG_DELTA) are 1.276 and 0.895 for 994856_g101
Found 4 entries without IDs and 3 entries that are acceptable afterglow candidates for 994856_g101.
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=272.2930 (18:09:10.32) DEC=67.8520 (+67:51:07.2)
XRT distances are from RA=272.2753 (18:09:06.08) DEC=67.8800 (+67:52:48.1)
-----------------
Entry 6 in the list of sources is a candidate afterglow for 994856_g101 with 3x3 stamp
ra=272.27750 (18:09:06.60) dec=67.89207 (+67:53:31.5) +/- 1.1" mag=20.36+/-0.35
dist=43.4 REFID=68
*** The position of this source is inconsistent with the XRT position.
The position is 145.8 arc sec from the BAT position.
src: 6 distr. of nearby unmatched sources: 0 0 0 0 0
Found 12 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
272.2655 67.8907 17.0 -1 USNO-B1 20.84 20.34 20.56
272.2664 67.8909 15.6 -1 USNO-B1 19.20 19.89 19.58
272.2702 67.8912 10.4 -1 USNO-B1 19.06 18.80 18.92
272.2753 67.8917 3.3 -1 USNO-B1 16.63 15.15 15.81 *
272.2748 67.8918 3.8 -1 USNO-B1 15.32 14.00 14.59 *
272.2717 67.8919 7.8 -1 USNO-B1 19.34 99.99 99.99
272.2809 67.8916 4.9 -1 USNO-B1 20.07 19.99 20.03
272.2759 67.8919 2.4 -1 USNO-B1 18.26 17.73 17.97 *
272.2789 67.8925 2.4 -1 USNO-B1 18.33 19.35 18.90 *
272.2808 67.8930 5.6 -1 USNO-B1 20.00 19.11 19.51
272.2837 67.8956 15.4 -1 USNO-B1 15.46 14.84 15.12
272.2846 67.8957 16.1 -1 USNO-B1 15.95 14.91 15.37
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 24 in the list of sources is a candidate afterglow for 994856_g101 with 3x3 stamp
ra=272.20239 (18:08:48.57) dec=67.87025 (+67:52:12.9) +/- 1.1" mag=21.16+/-0.35
dist=105.0 REFID=73
*** The position of this source is inconsistent with the XRT position.
The position is 139.4 arc sec from the BAT position.
src: 24 distr. of nearby unmatched sources: 0 0 0 0 0
Found 2 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
272.2041 67.8738 13.0 -1 USNO-B1 99.99 20.36 99.99
272.2039 67.8745 15.5 -1 USNO-B1 99.99 19.58 99.99
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 34 in the list of sources is a candidate afterglow for 994856_g101 with 3x3 stamp
ra=272.38574 (18:09:32.58) dec=67.85760 (+67:51:27.4) +/- 1.1" mag=20.82+/-0.35
dist=170.2 REFID=70
*** The position of this source is inconsistent with the XRT position.
The position is 127.5 arc sec from the BAT position.
src: 34 distr. of nearby unmatched sources: 0 0 0 0 0
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
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
272.2701 67.8790 8.0 -1 USNO-B1 99.99 19.57 99.99
The closest star is 8.01" away.
List UVOT sources within 10" of the XRT position:
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: 0 good candidate(s) found.
srclist paragraph message for exposure 1 of trigger 994856
------ Start for Possible Stand-alone Circular ----
In response to GRB200906 (Swift/BAT trigger 994856) at 13:11:04 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 76 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. The typical 3-sigma upper limit has been about 19.6 mag.
The 8'x8' region for the list of sources generated on-board covers 100% of the
XRT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.05.
------- notes for trigger 994856 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200906d21h24m31s611183usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=994856
-expid=621090766 -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/994856/
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 621090766.18682 or about 2020:250:13:12:41 UT
Found 630 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 11% of the srclist region. Found 73 sources in
srclist catalog. Found 4 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 14 source(s) in Genie image catalog. Found 0 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 21.02 mag. Found 121 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
14% of the Genie image region.
Genie image analysis:
Found 30216.7 counts in the large background region of 5907.0 pixels or a rate
of 5.115 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 20.46 mag. for a
4-arcsec aperture.
Found 1008.1 counts in the XRT position region of 203.0 pixels or a rate of
4.966 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.063 +/- 0.230 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.691 cps or 20.18 mag. The closest srclist
source has ra= 272.2921 dec= 67.8812 mag=18.63 sep=23.14". The closest Genie
source has ra= 272.2580 dec= 67.8798 mag=19.22 sep=23.52".
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?
621090766 76 WHITE srclist found no candidates.
621090766 76 WHITE image found no candidates.
List afterglow candidates for other finding charts.
621090978 288 U srclist found no candidates.
621090978 288 U image found no candidates.
621091556 866 WHITE srclist found no candidates.
621091556 866 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 67.88003
GRB_ERROR: 5
GRB_RA: 272.27533
IMAGE_START_TIME: 13:12:41
MAGNITUDE: 20.2
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT