image overlap message for exposure 3 of trigger 1185505
uvot_overlap.pl vrs. 2010-12-20b fem started at 230815d21h55m56s331397usUT
The observation of trigger 1185505 started 2023-08-15T16:01:32.2
Examining file ./1185505_g18696_uvot_sky_image.fits
The exposure ID is 713808092
The exposure time is 96.412 (seconds)
The filter is B.
*** Warning -- found 22143 null pixels in the image.
The uvot region is centered at (184.7114,-58.0517) with a roll angle of 310.8
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 (184.7720,-58.0650) with a radius of 3.000 arc min
This is 2.084 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 at most 2.88 sq. arc min or 0.10 of the BAT error circle
The XRT error circle is centered at (184.7234,-58.0533) with a radius of 0.032 arc min
This is 0.393 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 0.00 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 3 of trigger 1185505
find_uvot_ag.pl vrs. 2023-04-25a fem started at 230815d21h56m31s451098usUT
Observation start time is 2023-08-15T16:01:32.2
Examining file ./1185505_g18696_uvot_sources_image.fits
The exposure ID is 713808092
The exposure is 96.412 sec.
The bin size is 2 pixels
The filter is B
There are 0 detected source(s) for 1185505_g18696
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 184.7952 , -58.0516 with radius 2.00 arc min.
n_usno: 365 n_gsc: 371
*** WARNING -- XRT position is outside star catalog search region.
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.295
RA DEC Mag Color
bright star 0: 184.74283 (12:18:58.28) -58.03661 (-58:02:11.8) 11.90 USNO-V
bright star 1: 184.81921 (12:19:16.61) -58.03936 (-58:02:21.7) 11.29 GSC-V
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1185505_g18696.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=184.7720 (12:19:05.28) DEC=-58.0650 (-58:03:54.0)
XRT distances are from RA=184.7234 (12:18:53.61) DEC=-58.0533 (-58:03:11.8)
Found 1 entries in star catalog(s) within 20" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
184.7330 -58.0510 20.0 -1 GSC2.3 19.28 20.37 99.99
The closest star is 19.97" away.
List UVOT sources within 20" of the XRT position:
There are 0.0000000 counts in the bkg source region of 0.0000000 pixels.
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 17.80, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Results are questionable because aspect solution FAILED.
Region file: 1185505_713808092_230815d21h56m31s451098usUT_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(184.7114,-58.0517,45")
Region file: 1185505_713808092_230815d21h56m31s451098usUT_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(184.72338,-58.05328,8")
Region file: 1185505_713808092_230815d21h56m31s451098usUT_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(184.72338,-58.05328,25")
fk5;-circle(184.72338,-58.05328,15")
image paragraph message for exposure 3 of trigger 1185505
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: high density of stars
SRCLIST PROBLEM: high density of stars, srclist filled telemetry buffer
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
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 GRB230815 (Swift/BAT trigger 1185505) at 10:49:55 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the B filter starting
22298 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. Because of the density of catalogued stars, further analysis
is required to report an upper limit for any afterglow in the sub-image. The
8'x8' region for the list of sources generated on-board covers 100% of the XRT
error circle. Because of the density of catalogued stars, further analysis is
required to report an upper limit for any afterglow in the region. No
correction has been made for the large, but uncertain, extinction expected.
------- notes for trigger 1185505 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 230815d21h56m51s100548usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1185505
-expid=713811725 -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/1185505/
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 713811725.94946 or about 2023:227:17:02:00 UT
Found 3569 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 61% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 31 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 34 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 6 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.28 mag. Found 670 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 59% of the Genie image region.
Genie image analysis:
Found 89271.2 counts in the large background region of 5458.0 pixels or a rate
of 16.356 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 19.52 mag. for a
4-arcsec aperture.
Found 3457.8 counts in the XRT position region of 199.0 pixels or a rate of
17.376 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.986 +/- 0.255 (1-sigma) cps or
18.93 mag and a range from 18.68 to 19.26 mag. The 3-sigma UL at the XRT
position is 1.752 cps or 18.31 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.58 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 184.7270 dec= -58.0546 mag=18.13 sep=8.29".
The closest srclist source has ra= 184.7270 dec= -58.0546 mag=18.13 sep=8.29".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 184.7271 dec= -58.0546 mag=17.52 sep=8.51". The closest Genie
source has ra= 184.7271 dec= -58.0546 mag=17.52 sep=8.51".
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 250 seconds with the B filter starting
22298 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 12:18:54.50 = 184.72710
DEC(J2000) = -58:03:16.5 = -58.05459
with a 90%-confidence error radius of about 0.62 arc sec. This position is 8.51
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.52 with a 1-sigma error of about 0.15. 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?
713811725 22297 B srclist found no candidates.
713811725 22297 B image found no candidates.
List afterglow candidates for other finding charts.
713789582 154 ? srclist data are not available.
713789582 154 WHITE image found no candidates.
713807836 18408 U srclist found no candidates.
713807836 18408 U image found no candidates.
713808092 18664 B srclist found no candidates.
713808092 18664 B image found no candidates.
713812038 22610 ? srclist data are not available.
713812038 22610 U image found no candidates.
713817179 27751 U srclist found no candidates.
713817179 27751 U image found no candidates.
713817434 28006 B srclist found no candidates.
713817434 28006 B image found no candidates.
713817748 28320 U srclist found no candidates.
713817748 28320 U image found no candidates.
713818003 28575 B srclist found no candidates.
713818003 28575 B image found no candidates.
713828679 39251 U srclist found no candidates.
713828679 39251 U image found no candidates.
713828934 39506 B srclist found no candidates.
713828934 39506 ? image data are not available.
------- Tokens for Quick GCN -------