srclist overlap message for exposure 1 of trigger 1002158
uvot_overlap.pl vrs. 2010-12-20b fem started at 201027d11h16m13s506464usUT
The observation of trigger 1002158 started 2020-10-27T01:09:36.7
Examining file ./1002158_g111_uvot_sky_srclist.fits
The exposure ID is 625453776
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (155.9825,-5.5159) with a roll angle of 101.9
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 (155.9740,-5.5150) with a radius of 3.000 arc min
This is 0.508 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 (155.9698,-5.5100) with a radius of 0.030 arc min
This is 0.837 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 1002158
find_uvot_ag.pl vrs. 2017-02-17 fem started at 201027d11h16m18s173316usUT
Observation start time is 2020-10-27T01:09:36.7
Examining file ./1002158_g111_uvot_catalog_srclist.fits
The exposure ID is 625453776
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 27 detected source(s) for 1002158_g111
Aspect correction adds 0.00145 degrees (0.348 sec of time = 5.19 arc sec) to RA
Aspect correction adds -0.00082 degrees (-2.94 arcsec) to Dec
Total aspect correction is 5.97 arcsec
Star catalogs centered at 155.9747 , -5.5232 with radius 6.10 arc min.
n_usno: 0 n_gsc: 0
*** WARNING -- no star catalog entries found.
-- this strongly suggests a problem with the catalogs.
-- cannot check for bright stars or nearby sources.
-- there is a high risk of false positives.
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 23 matched entries is 0.603" for 1002158_g111
Mean and std. dev of mag. difference (MAG_DELTA) are 1.893 and 0.431 for 1002158_g111
Found 4 entries without IDs and 3 entries that are acceptable afterglow candidates for 1002158_g111.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=155.9740 (10:23:53.76) DEC=-5.5150 (-05:30:54.0)
XRT distances are from RA=155.9698 (10:23:52.74) DEC=-5.5100 (-05:30:36.1)
-----------------
Entry 8 in the list of sources is a candidate afterglow for 1002158_g111 with 5x5 stamp
ra=156.01526 (10:24:03.66) dec=-5.49945 (-05:29:58.0) +/- 1.1" mag=18.34+/-0.35
dist=167.5 REFID=22
*** The position of this source is inconsistent with the XRT position.
The position is 158.1 arc sec from the BAT position.
src: 8 distr. of nearby unmatched sources: 2 0 1 2 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)
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 9 in the list of sources is a candidate afterglow for 1002158_g111 with 5x5 stamp
ra=156.01578 (10:24:03.79) dec=-5.49999 (-05:29:60.0) +/- 1.1" mag=19.56+/-0.35
dist=168.8 REFID=24
*** The position of this source is inconsistent with the XRT position.
The position is 159.2 arc sec from the BAT position.
src: 9 distr. of nearby unmatched sources: 2 0 2 1 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
-----------------
Entry 11 in the list of sources is a candidate afterglow for 1002158_g111 with 5x5 stamp
ra=156.01576 (10:24:03.78) dec=-5.49455 (-05:29:40.4) +/- 1.1" mag=19.34+/-0.35
dist=174.0 REFID=26
*** The position of this source is inconsistent with the XRT position.
The position is 166.8 arc sec from the BAT position.
src: 11 distr. of nearby unmatched sources: 0 0 0 3 1
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 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 1 candidate(s) outside XRT error circle with mag < 18.66
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 1002158
------ Start for Possible Stand-alone Circular ----
In response to GRB201027 (Swift/BAT trigger 1002158) at 01:07:44 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 86 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
0.04.
------- notes for trigger 1002158 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 201027d11h16m22s370512usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1002158
-expid=625453776 -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/1002158/
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 625453776.7251 or about 2020:301:01:09:31 UT
There was likely a PROBLEM with the srclist star catalog because no stars
found. Found 27 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 5 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 20.27 mag. Found 0 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 0% of the
Genie image region.
Genie image analysis:
Found 123349.9 counts in the large background region of 6088.0 pixels or a rate
of 20.261 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 19.72 mag. for a
4-arcsec aperture.
Found 3872.1 counts in the XRT position region of 199.0 pixels or a rate of
19.458 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -1.002 +/- 0.448 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.344 cps or 19.46 mag. The closest srclist
source has ra= 155.9733 dec= -5.5211 mag=18.71 sep=41.85". The closest Genie
source has ra= 155.9734 dec= -5.5211 mag=18.31 sep=41.89".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the srclist data with mag < 18.66 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=156.01526
(10:24:03.66), DEC=-5.49945 (-05:29:58.0) (J2000). It has a mag of 18.34. It is
158.1" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 86 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 10:24:03.66 = 156.01526
DEC(J2000) = -05:29:58.0 = -5.49945
with a 90%-confidence error radius of about 1.10 arc sec. The estimated
magnitude is 18.34 with a 1-sigma error of about 0.35. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.04.
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?
625453776 85 WHITE srclist found no candidates.
625453776 85 WHITE image found no candidates.
List afterglow candidates for other finding charts.
625453988 297 U srclist found no candidates.
625453988 297 U image found no candidates.
625454569 878 WHITE srclist found no candidates.
625454569 878 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -5.51003
GRB_ERROR: 5
GRB_RA: 155.96975
IMAGE_START_TIME: 01:09:31
MAGNITUDE: 19.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT