srclist overlap message for exposure 1 of trigger 863421
uvot_overlap.pl vrs. 2010-12-20b fem started at 180925d22h21m33s081702usUT
The observation of trigger 863421 started 2018-09-25T14:39:52.0
Examining file ./863421_g140_uvot_sky_srclist.fits
The exposure ID is 559579192
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (315.2036,-64.4495) with a roll angle of 229.6
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 (315.2130,-64.4430) with a radius of 3.000 arc min
This is 0.459 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 (315.2008,-64.4569) with a radius of 0.063 arc min
This is 0.450 arc min from the center of the uvot region
The area of the XRT error circle is 0.013 sq. arc min
The UVOT/XRT overlap is 0.013 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 1 of trigger 863421
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180925d22h21m37s103979usUT
Observation start time is 2018-09-25T14:39:52.0
Examining file ./863421_g140_uvot_catalog_srclist.fits
The exposure ID is 559579192
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 65 detected source(s) for 863421_g140
Aspect correction adds -0.00123 degrees (-0.295 sec of time = -1.91 arc sec) to RA
Aspect correction adds 0.00046 degrees ( 1.67 arcsec) to Dec
Total aspect correction is 2.54 arcsec
Star catalogs centered at 315.2065 , -64.4494 with radius 6.40 arc min.
n_usno: 520 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 67 matched entries is 0.760" for 863421_g140
Mean and std. dev of mag. difference (MAG_DELTA) are 1.432 and 0.740 for 863421_g140
Found 5 entries without IDs and 4 entries that are acceptable afterglow candidates for 863421_g140.
Acceptable entries have no ID, XRT distances < 9.5", 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=315.2130 (21:00:51.12) DEC=-64.4430 (-64:26:34.8)
XRT distances are from RA=315.2008 (21:00:48.18) DEC=-64.4569 (-64:27:24.8)
-----------------
Entry 4 in the list of sources is a candidate afterglow for 863421_g140 with 3x3 stamp
ra=315.19763 (21:00:47.43) dec=-64.46465 (-64:27:52.7) +/- 1.1" mag=20.46+/-0.35
dist=28.4 REFID=65
*** The position of this source is inconsistent with the XRT position.
The position is 81.5 arc sec from the BAT position.
src: 4 distr. of nearby unmatched sources: 0 0 0 0 2
Found 2 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
315.1953 -64.4644 3.8 -1 USNO-B1 19.63 20.15 19.92 *
315.1982 -64.4654 2.8 -1 USNO-B1 16.41 15.71 16.02 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 23 in the list of sources is a candidate afterglow for 863421_g140 with 3x3 stamp
ra=315.29483 (21:01:10.76) dec=-64.47595 (-64:28:33.4) +/- 1.1" mag=19.81+/-0.35
dist=161.3 REFID=58
*** The position of this source is inconsistent with the XRT position.
The position is 173.8 arc sec from the BAT position.
src: 23 distr. of nearby unmatched sources: 0 0 1 0 0
Found 6 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
315.2873 -64.4760 11.7 -1 USNO-B1 20.00 19.59 19.77
315.2881 -64.4763 10.5 -1 USNO-B1 19.69 18.51 19.03
315.2896 -64.4762 8.2 -1 USNO-B1 19.40 18.55 18.93
315.2867 -64.4801 19.6 -1 USNO-B1 16.35 14.98 15.59
315.2932 -64.4771 4.9 -1 USNO-B1 20.37 13.01 16.28
315.2949 -64.4770 3.8 -1 USNO-B1 14.48 12.90 13.60 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 40 in the list of sources is a candidate afterglow for 863421_g140 with 3x3 stamp
ra=315.20388 (21:00:48.93) dec=-64.40500 (-64:24:18.0) +/- 1.1" mag=20.03+/-0.35
dist=186.9 REFID=56
*** The position of this source is inconsistent with the XRT position.
The position is 137.5 arc sec from the BAT position.
src: 40 distr. of nearby unmatched sources: 0 1 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
315.1988 -64.4087 15.5 -1 USNO-B1 20.39 19.82 20.07
315.2050 -64.4058 3.5 -1 USNO-B1 15.67 13.89 14.68 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 41 in the list of sources is a candidate afterglow for 863421_g140 with 3x3 stamp
ra=315.19844 (21:00:47.62) dec=-64.40352 (-64:24:12.7) +/- 1.1" mag=20.40+/-0.35
dist=192.2 REFID=64
*** The position of this source is inconsistent with the XRT position.
The position is 143.9 arc sec from the BAT position.
src: 41 distr. of nearby unmatched sources: 0 1 0 0 0
Found 3 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
315.1988 -64.4087 18.7 -1 USNO-B1 20.39 19.82 20.07
315.2050 -64.4058 13.2 -1 USNO-B1 15.67 13.89 14.68
315.1880 -64.4023 16.8 -1 USNO-B1 15.79 13.92 14.75
*** If XRT position is correct, then this is NOT the afterglow
Found 0 entries in star catalog(s) within 10" of the XRT position.
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 < 9.5",
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 863421
1 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 GRB180925 (Swift/BAT trigger 863421) at 14:37:31 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 118 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
0.03.
------- notes for trigger 863421 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180925d22h21m50s249774usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=863421
-expid=559579192 -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/863421/
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 559579192.042 or about 2018:268:14:39:47 UT
Found 516 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 65 sources in
srclist catalog. Found 5 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 10 source(s) in Genie image catalog. 1 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
20.80 mag. Found 50 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 7% of the Genie image region.
Genie image analysis:
Found 41897.1 counts in the large background region of 5470.0 pixels or a rate
of 7.659 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 20.24 mag. for a
4-arcsec aperture.
Found 2097.4 counts in the XRT position region of 204.0 pixels or a rate of
10.281 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 2.937 +/- 0.327 (1-sigma) cps or
18.61 mag and a range from 18.50 to 18.74 mag. The 3-sigma UL at the XRT
position is 3.919 cps or 18.30 mag. The closest srclist source has ra= 315.1941
dec= -64.4594 mag=14.97 sep=13.76".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 315.2024 dec= -64.4572 mag=19.07 sep=2.73". The closest Genie
source has ra= 315.2024 dec= -64.4572 mag=19.07 sep=2.73".
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 118 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 21:00:48.57 = 315.20237
DEC(J2000) = -64:27:25.9 = -64.45719
with a 90%-confidence error radius of about 0.64 arc sec. This position is 2.73
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.07 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.03.
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?
559579192 118 WHITE srclist found no candidates.
559579192 118 WHITE image found no candidates.
List afterglow candidates for other finding charts.
559579349 275 U srclist found no candidates.
559579349 275 U image found no candidates.
559579930 856 WHITE srclist found no candidates.
559579930 856 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -64.45689
GRB_ERROR: 9.5
GRB_RA: 315.20075
IMAGE_START_TIME: 14:39:47
MAGNITUDE: 18.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT