srclist overlap message for exposure 2 of trigger 1163401
uvot_overlap.pl vrs. 2010-12-20b fem started at 230409d11h40m13s115139usUT
The observation of trigger 1163401 started 2023-04-09T05:11:49.8
Examining file ./1163401_g892_uvot_sky_srclist.fits
The exposure ID is 702709909
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (329.5394,52.8507) with a roll angle of 121.3
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 (329.5300,52.8540) with a radius of 3.000 arc min
This is 0.395 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 (329.5147,52.8321) with a radius of 0.037 arc min
This is 1.430 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1163401
find_uvot_ag.pl vrs. 2023-03-28 fem started at 230409d11h40m25s684479usUT
Observation start time is 2023-04-09T05:11:49.8
Examining file ./1163401_g892_uvot_catalog_srclist.fits
The exposure ID is 702709909
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 190 detected source(s) for 1163401_g892
*** WARNING -- the sources have filled the available telemetry buffer (190).
srclist_overlap returned: bat_overlap 0.000
srclist_overlap returned: xrt_overlap 0.000
Dimmest detected source in 1163401_g892 has mag 18.51
Aspect correction adds 0.00146 degrees (0.351 sec of time = 3.18 arc sec) to RA
Aspect correction adds -0.00145 degrees (-5.23 arcsec) to Dec
Total aspect correction is 6.12 arcsec
*** WARNING -- access to usno-b1 catalog failed.
Star catalogs centered at 329.5856 , 52.8712 with radius 8.23 arc min.
n_usno: -1 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 194 matched entries is 0.829" for 1163401_g892
Mean and std. dev of mag. difference (MAG_DELTA) are 2.136 and 0.650 for 1163401_g892
Found 13 entries without IDs and 2 entries that are acceptable afterglow candidates for 1163401_g892.
Acceptable entries have no ID, XRT distances < 5.5", 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=329.5300 (21:58:07.20) DEC=52.8540 (+52:51:14.4)
XRT distances are from RA=329.5147 (21:58:03.54) DEC=52.8321 (+52:49:55.6)
-----------------
Entry 6 in the list of sources is a candidate afterglow for 1163401_g892 with 1x1 stamp
ra=329.54846 (21:58:11.63) dec=52.86603 (+52:51:57.7) +/- 1.1" mag=16.40+/-0.35
dist=142.4 REFID=140
*** The position of this source is inconsistent with the XRT position.
The position is 59.0 arc sec from the BAT position.
src: 6 distr. of nearby unmatched sources: 1 3 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)
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 8 in the list of sources is a candidate afterglow for 1163401_g892 with 1x1 stamp
ra=329.55262 (21:58:12.63) dec=52.86650 (+52:51:59.4) +/- 1.1" mag=17.04+/-0.35
dist=148.7 REFID=139
*** The position of this source is inconsistent with the XRT position.
The position is 66.6 arc sec from the BAT position.
src: 8 distr. of nearby unmatched sources: 0 1 3 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
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 2 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 < 5.5",
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 1163401
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no overlap
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB230409 (Swift/BAT trigger 1163401) at 04:56:56 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 861 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 0.00% of the XRT error circle. No correction has been made for
the large, but uncertain, extinction expected.
------- notes for trigger 1163401 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 230409d11h40m28s156815usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1163401
-expid=702709909 -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/1163401/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
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 702709909.82306 or about 2023:099:05:11:44 UT
Access to USNO star catalog FAILED. This increases the odds of a FALSE
afterglow detection. There was likely a PROBLEM with the srclist star catalog
because no stars found. Found 190 sources in srclist catalog. WARNING --
srclist catalog buffer filled. Found 13 srclist source(s) without IDs. There
are 0 good candidate(s) in the srclist catalog. Good candidates must be
brighter than 19.22 mag.
Access to USNO star catalog FAILED. This increases the odds of a FALSE
afterglow detection. Found 51 source(s) in Genie image catalog. 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 20.12 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 131372.6 counts in the large background region of 4910.0 pixels or a rate
of 26.756 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 19.39 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 18.51 mag. The closest srclist
source has ra= 329.5255 dec= 52.8474 mag=16.08 sep=59.75". The closest Genie
source has ra= 329.5145 dec= 52.8350 mag=18.74 sep=10.51".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the image data with mag < 19.56 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=329.55253
(21:58:12.61), DEC=52.86663 (+52:51:59.9) (J2000). It has a mag of 17.06. It is
66.8" 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 861 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 21:58:12.61 = 329.55253
DEC(J2000) = +52:51:59.9 = 52.86663
with a 90%-confidence error radius of about 0.62 arc sec. The estimated
magnitude is 17.06 with a 1-sigma error of about 0.14. No correction has been
made for the large, but uncertain, extinction expected.
This paragraph is only useful if the XRT position is grossly wrong. There are 2
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=329.54846
(21:58:11.63), DEC=52.86603 (+52:51:57.7) (J2000). It has a mag of 16.40. It is
59.0" 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 861 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 21:58:11.63 = 329.54846
DEC(J2000) = +52:51:57.7 = 52.86603
with a 90%-confidence error radius of about 1.10 arc sec. The estimated
magnitude is 16.40 with a 1-sigma error of about 0.35. 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?
702709909 861 WHITE srclist found no candidates.
702709909 861 WHITE image found no candidates.
List afterglow candidates for other finding charts.
702709434 386 WHITE srclist found no candidates.
702709434 386 WHITE image found no candidates.
------- Tokens for Quick GCN -------