image overlap message for exposure 2 of trigger 1163119
uvot_overlap.pl vrs. 2010-12-20b fem started at 230406d00h15m14s653215usUT
The observation of trigger 1163119 started 2023-04-05T20:03:21.1
Examining file ./1163119_g317_uvot_sky_image.fits
The exposure ID is 702417801
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (271.4469,-47.0697) with a roll angle of 95.4
It is square with sides of 2.68 arc min. for an area of 7.17 sq arc min
The BAT error circle is centered at (271.4670,-47.0700) with a radius of 3.000 arc min
This is 0.823 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 7.17 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (271.4406,-47.0698) with a radius of 0.037 arc min
This is 0.255 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
image afterglow message for exposure 2 of trigger 1163119
find_uvot_ag.pl vrs. 2023-03-28 fem started at 230406d00h15m24s477635usUT
Observation start time is 2023-04-05T20:03:21.1
Examining file ./1163119_g317_uvot_catalog_image.fits
The exposure ID is 702417801
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 40 detected source(s) for 1163119_g317
Aspect correction adds 0.00185 degrees (0.444 sec of time = 4.53 arc sec) to RA
Aspect correction adds -0.00065 degrees (-2.34 arcsec) to Dec
Total aspect correction is 5.10 arcsec
*** WARNING -- access to usno-b1 catalog failed.
Star catalogs centered at 271.4440 , -47.0691 with radius 2.69 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 44 matched entries is 0.706" for 1163119_g317
Mean and std. dev of mag. difference (MAG_DELTA) are 1.421 and 0.634 for 1163119_g317
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1163119_g317.
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=271.4670 (18:05:52.08) DEC=-47.0700 (-47:04:12.0)
XRT distances are from RA=271.4406 (18:05:45.75) DEC=-47.0698 (-47:04:11.4)
-----------------
Entry 10 in the list of sources is a candidate afterglow for 1163119_g317 with genie
ra=271.42808 (18:05:42.74) dec=-47.07833 (-47:04:42.0) +/- 0.7" mag=18.19+/-0.16
dist=43.4 REFID=32 major=1.2 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 100.0 arc sec from the BAT position.
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 13 in the list of sources is a candidate afterglow for 1163119_g317 with genie
ra=271.45844 (18:05:50.02) dec=-47.06297 (-47:03:46.7) +/- 0.6" mag=17.42+/-0.15
dist=50.2 REFID=18 major=1.4 minor=1.1 flag=2 (blended)
*** The position of this source is inconsistent with the XRT position.
The position is 32.9 arc sec from the BAT position.
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 20943.537 counts in the bkg source region of 5228.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.006 counts/pixel (5-sig UL in 4" is 19.71 mag) for 1163119_g317
There are 796.08484 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.980 counts/pixel for 1163119_g317
There are 4371.1387 counts in the xrt_bkg source region of 1079.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 4.051 counts/pixel (5-sig UL in 4" is 19.71 mag) for 1163119_g317
There are 2 candidate(s) outside XRT error circle with mag < 19.71
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.27, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1163119_702417801_230406d00h15m24s477635usUT_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(271.4469,-47.0697,45")
fk5;-circle(271.440614404579,-47.0663019438148,6")
fk5;-circle(271.432054876568,-47.0650207632942,6")
fk5;-circle(271.442725770135,-47.0752645434572,6")
fk5;-circle(271.442017336393,-47.0605289448396,6")
fk5;-circle(271.433763167839,-47.0602661397308,6")
fk5;-circle(271.451278959927,-47.074263998239,6")
fk5;-circle(271.454003290479,-47.0670251637681,6")
fk5;-circle(271.443530619566,-47.0814845527793,6")
fk5;-circle(271.456225647492,-47.061796450866,6")
fk5;-circle(271.458436495888,-47.0629672424285,6")
fk5;-circle(271.451024888101,-47.0815371066228,6")
fk5;-circle(271.465546851175,-47.0735316437986,6")
fk5;-circle(271.466362453465,-47.0701876182833,6")
Region file: 1163119_702417801_230406d00h15m24s477635usUT_xrt.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(271.44062,-47.06983,8")
Region file: 1163119_702417801_230406d00h15m24s477635usUT_xrt_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(271.44062,-47.06983,25")
fk5;-circle(271.44062,-47.06983,15")
fk5;-circle(271.440614404579,-47.0663019438148,6")
fk5;-circle(271.432054876568,-47.0650207632942,6")
fk5;-circle(271.442725770135,-47.0752645434572,6")
fk5;-circle(271.451278959927,-47.074263998239,6")
image paragraph message for exposure 2 of trigger 1163119
SRCLIST PROBLEM: srclist filled telemetry buffer
------ Start for Possible Stand-alone Circular ----
In response to GRB230405 (Swift/BAT trigger 1163119) at 19:58:03 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
286 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 19.2 mag. 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 expected extinction
corresponding to E(B-V) of 0.166.
------- notes for trigger 1163119 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 230406d00h15m28s760437usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1163119
-expid=702417801 -meonly -msg_image
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/1163119/
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 702417801.05206 or about 2023:095:20:03:16 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 34 srclist source(s) without IDs. There
are 0 good candidate(s) in the srclist catalog. Good candidates must be
brighter than 18.12 mag.
Access to USNO star catalog FAILED. This increases the odds of a FALSE
afterglow detection. Found 40 source(s) in Genie image catalog. Found 2 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 20943.5 counts in the large background region of 5228.0 pixels or a rate
of 4.006 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 19.54 mag. for a
4-arcsec aperture.
Found 796.1 counts in the XRT position region of 200.0 pixels or a rate of
3.981 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.056 +/- 0.123 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.369 cps or 19.25 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 18.51
mag. The closest srclist source has ra= 271.4326 dec= -47.0659 mag=18.04
sep=24.16". The closest Genie source has ra= 271.4406 dec= -47.0663 mag=19.62
sep=12.70".
This paragraph is only useful if the XRT position is grossly wrong. There are 2
candidate(s) in the image data with mag < 19.71 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=271.45844
(18:05:50.03), DEC=-47.06297 (-47:03:46.7) (J2000). It has a mag of 17.42. It
is 32.9" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 250 seconds with the U filter starting
286 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:05:50.03 = 271.45844
DEC(J2000) = -47:03:46.7 = -47.06297
with a 90%-confidence error radius of about 0.63 arc sec. The estimated
magnitude is 17.42 with a 1-sigma error of about 0.15. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.166.
This paragraph is only useful if the XRT position is grossly wrong. There are 8
candidate(s) in the srclist data with mag < 17.56 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=271.47471
(18:05:53.93), DEC=-47.01747 (-47:01:02.9) (J2000). It has a mag of 12.87. It
is 190.1" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 250 seconds with the U filter starting
286 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 18:05:53.93 = 271.47471
DEC(J2000) = -47:01:02.9 = -47.01747
with a 90%-confidence error radius of about 1.10 arc sec. The estimated
magnitude is 12.87 with a 1-sigma error of about 0.35. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.166.
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?
702417801 286 U srclist found no candidates.
702417801 286 U image found no candidates.
List afterglow candidates for other finding charts.
702417588 73 WHITE srclist found no candidates.
702417588 73 WHITE image found no candidates.
702418381 866 WHITE srclist found no candidates.
702418381 866 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -47.06983
GRB_ERROR: 5.5
GRB_RA: 271.44062
IMAGE_START_TIME: 20:03:16
MAGNITUDE: 19.2
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT