image overlap message for exposure 2 of trigger 1152509
uvot_overlap.pl vrs. 2010-12-20b fem started at 230204d07h40m45s927870usUT
The observation of trigger 1152509 started 2023-02-04T03:02:42.3
Examining file ./1152509_g344_uvot_sky_image.fits
The exposure ID is 697172562
The exposure time is 249.935 (seconds)
The filter is U.
*** Warning -- found 18280 null pixels in the image.
The uvot region is centered at (238.2004,-50.9159) with a roll angle of 92.3
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 (238.1640,-50.8580) with a radius of 3.000 arc min
This is 3.740 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 1.20 sq. arc min or 0.04 of the BAT error circle
The XRT error circle is centered at (238.1996,-50.9165) with a radius of 0.037 arc min
This is 0.046 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 0.00 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1152509
find_uvot_ag.pl vrs. 2020-10-30 fem started at 230204d07h40m57s406107usUT
Observation start time is 2023-02-04T03:02:42.3
Examining file ./1152509_g344_uvot_catalog_image.fits
The exposure ID is 697172562
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 4 detected source(s) for 1152509_g344
Aspect correction adds 0.00085 degrees (0.204 sec of time = 1.93 arc sec) to RA
Aspect correction adds -0.00017 degrees (-0.62 arcsec) to Dec
Total aspect correction is 2.03 arcsec
Star catalogs centered at 238.2105 , -50.9139 with radius 2.50 arc min.
n_usno: 317 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 3 matched entries is 0.720" for 1152509_g344
Mean and std. dev of mag. difference (MAG_DELTA) are 1.746 and 0.567 for 1152509_g344
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1152509_g344.
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=238.1640 (15:52:39.36) DEC=-50.8580 (-50:51:28.8)
XRT distances are from RA=238.1996 (15:52:47.91) DEC=-50.9165 (-50:54:59.5)
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1152509_g344 with genie
ra=238.18771 (15:52:45.05) dec=-50.89626 (-50:53:46.5) +/- 1.1" mag=19.58+/-0.29
dist=77.8 REFID=2 major=1.7 minor=1.1 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 147.9 arc sec from the BAT position.
Found 5 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
238.1946 -50.8932 19.0 -1 USNO-B1 19.76 17.16 18.31
238.1835 -50.8961 9.5 -1 USNO-B1 99.99 19.15 99.99
238.1901 -50.8923 15.2 -1 USNO-B1 22.07 18.93 20.32
238.1824 -50.8954 12.4 -1 USNO-B1 21.91 18.21 19.85
238.1838 -50.8930 14.6 -1 USNO-B1 22.07 19.88 20.85
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 1.7
Found 2 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
238.2031 -50.9179 9.4 -1 USNO-B1 20.43 18.18 19.18
238.2001 -50.9153 4.5 -1 USNO-B1 15.42 12.96 14.05
The closest star is 4.54" away.
List UVOT sources within 10" of the XRT position:
There are 3731.8428 counts in the bkg source region of 399.00000 pixels.
Rate in bkg region from 0 to 45 arcsec is 9.353 counts/pixel (5-sig UL in 4" is 19.25 mag) for 1152509_g344
There are 0.0000000 counts in the xrt source region of 0.0000000 pixels.
There are 0.0000000 counts in the xrt_bkg source region of 0.0000000 pixels.
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 19.81, 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: 1152509_697172562_230204d07h40m57s406107usUT_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(238.2004,-50.9159,45")
Region file: 1152509_697172562_230204d07h40m57s406107usUT_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(238.19962,-50.91653,8")
Region file: 1152509_697172562_230204d07h40m57s406107usUT_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(238.19962,-50.91653,25")
fk5;-circle(238.19962,-50.91653,15")
image paragraph message for exposure 2 of trigger 1152509
IMAGE PROBLEM: no overlap
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB230204 (Swift/BAT trigger 1152509) at 02:56:57 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
314 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 large, but uncertain,
extinction expected.
------- notes for trigger 1152509 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 230204d07h41m01s496440usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1152509
-expid=697172562 -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/1152509/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Large extinction of 8.180 found for bat position. Unreliable extinction found
for xrt position. 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 697172562.257 or about 2023:035:03:02:37 UT
Found 1870 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 34% of the srclist region. Found 167 sources in
srclist catalog. Found 93 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 4 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 19.81 mag. Found 313 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 34% of the
Genie image region. The Genie image is INCOMPLETE with 18280 null pixels.
Genie image analysis:
Found 3731.8 counts in the large background region of 399.0 pixels or a rate of
9.353 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 19.08 mag. for a
4-arcsec aperture. The closest srclist source has ra= 238.1996 dec= -50.9227
mag=18.01 sep=22.13". The closest Genie source has ra= 238.1928 dec= -50.9013
mag=17.67 sep=56.97".
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?
697172562 314 U srclist found no candidates.
697172562 314 U image found no candidates.
List afterglow candidates for other finding charts.
697172404 156 WHITE srclist found no candidates.
697172404 156 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -50.91653
GRB_ERROR: 5.5
GRB_RA: 238.19962
IMAGE_START_TIME: 03:02:37
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT