srclist overlap message for exposure 2 of trigger 958141
uvot_overlap.pl vrs. 2010-12-20b fem started at 200224d16h22m34s480725usUT
The observation of trigger 958141 started 2020-02-24T03:29:32.8
Examining file ./958141_g282_uvot_sky_srclist.fits
The exposure ID is 604207772
The exposure time is undefined.
The filter is U.
The uvot region is centered at (248.8009,41.6745) with a roll angle of 98.6
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (248.7940,41.6750) with a radius of 3.000 arc min
This is 0.312 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 (248.7665,41.6113) with a radius of 0.028 arc min
This is 4.094 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 2 of trigger 958141
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200224d16h22m44s458725usUT
Observation start time is 2020-02-24T03:29:32.8
Examining file ./958141_g282_uvot_catalog_srclist.fits
The exposure ID is 604207772
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 57 detected source(s) for 958141_g282
Aspect correction adds 0.00134 degrees (0.322 sec of time = 3.61 arc sec) to RA
Aspect correction adds -0.00071 degrees (-2.55 arcsec) to Dec
Total aspect correction is 4.42 arcsec
Star catalogs centered at 248.7968 , 41.6776 with radius 8.20 arc min.
n_usno: 593 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.75946
RA DEC Mag Color
bright star 0: 248.68176 (16:34:43.62) 41.71903 (+41:43:08.5) 10.76 USNO-V
Mean distance difference (CAT_DELTA) for 38 matched entries is 0.748" for 958141_g282
Mean and std. dev of mag. difference (MAG_DELTA) are 2.089 and 1.074 for 958141_g282
Found 19 entries without IDs and 2 entries that are acceptable afterglow candidates for 958141_g282.
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.
12 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=248.7940 (16:35:10.56) DEC=41.6750 (+41:40:30.0)
XRT distances are from RA=248.7665 (16:35:03.97) DEC=41.6113 (+41:36:40.8)
*** WARNING 33 per cent of entries have no IDs.
-----------------
Entry 14 in the list of sources is a candidate afterglow for 958141_g282 with 3x3 stamp
ra=248.76775 (16:35:04.26) dec=41.61167 (+41:36:42.0) +/- 1.1" mag=19.12+/-0.35
dist=3.5 REFID=43
src: 14 distr. of nearby unmatched sources: 1 0 0 0 0
Found 0 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)
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 mag
-----------------
Entry 15 in the list of sources is a candidate afterglow for 958141_g282 with 3x3 stamp
ra=248.76679 (16:35:04.03) dec=41.61168 (+41:36:42.0) +/- 1.1" mag=19.29+/-0.35
dist=1.4 REFID=49
src: 15 distr. of nearby unmatched sources: 1 0 0 0 0
Found 0 entries in star catalog(s) within 20.0" of the candidate.
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 mag
separation of 14 and 15 is 2.6 arc sec
Eliminate candidate 15 -- it is only 2.6 arc sec from candidate 14 and dimmer
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=248.76775 (16:35:04.26) dec=41.61167 (+41:36:42.0) +/- 1.1" mag=19.12+/-0.35 dist=3.5 REFID=43
Unmatched source ra=248.76679 (16:35:04.03) dec=41.61168 (+41:36:42.0) +/- 1.1" mag=19.29+/-0.35 dist=1.4 REFID=49
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 18.12, 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 2 of trigger 958141
IMAGE PROBLEM: no overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB200224 (Swift/BAT trigger 958141) at 03:24:49 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
259 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. The list of sources is typically complete
to about 18.0 mag. No correction has been made for the expected extinction
corresponding to E(B-V) of 0.00.
------- notes for trigger 958141 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200224d16h22m46s692605usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=958141
-expid=604207772 -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/958141/
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.
*** Warning -- BAT and XRT error circles do NOT overlap.
UVOT exposure began at MET 604207772.84782 or about 2020:055:03:29:27 UT
Found 589 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 57 sources in
srclist catalog. Found 19 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 1 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 20.81 mag. Found 25 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 4% of the
Genie image region. The XRT position was OUTSIDE the star catalog search
region.
Genie image analysis:
Found 9277.7 counts in the large background region of 6304.0 pixels or a rate
of 1.472 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 20.30 mag. for a
4-arcsec aperture.
Found 2 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 248.7668 dec= 41.6117 mag=19.29 sep=1.41".
The closest srclist source has ra= 248.7668 dec= 41.6117 mag=19.29 sep=1.41".
The closest Genie source has ra= 248.7882 dec= 41.6882 mag=18.69 sep=282.71".
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 250 seconds with the U filter starting
259 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 16:35:04.03 = 248.76679
DEC(J2000) = +41:36:42.0 = 41.61168
with a 90%-confidence error radius of about 1.10 arc sec. This position is 1.41
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.29 with a 1-sigma error of about 0.35. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.00.
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?
604207772 258 U 248.76775 41.61167 19.12/18.1 3.5 srclist Yes
604207772 258 U image found no candidates.
List afterglow candidates for other finding charts.
604207614 100 WHITE 248.76744 41.61182 18.45/19.2 3.0 srclist Yes
604207614 100 WHITE image found no candidates.
604208374 860 WHITE srclist found no candidates.
604208374 860 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 41.61133
GRB_ERROR: 5
GRB_RA: 248.76654
IMAGE_START_TIME: 03:29:27
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT