image overlap message for exposure 4 of trigger 1185673
uvot_overlap.pl vrs. 2010-12-20b fem started at 230817d03h24m49s231160usUT
The observation of trigger 1185673 started 2023-08-16T17:28:57.5
Examining file ./1185673_g4808_uvot_sky_image.fits
The exposure ID is 713899737
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (328.4443,37.8599) with a roll angle of 15.1
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 (328.3750,37.8280) with a radius of 3.000 arc min
This is 3.800 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 1.09 sq. arc min or 0.04 of the BAT error circle
The XRT error circle is centered at (328.4457,37.8549) with a radius of 0.038 arc min
This is 0.304 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 4 of trigger 1185673
find_uvot_ag.pl vrs. 2023-04-25a fem started at 230817d03h25m28s739738usUT
Observation start time is 2023-08-16T17:28:57.5
Examining file ./1185673_g4808_uvot_catalog_image.fits
The exposure ID is 713899737
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 17 detected source(s) for 1185673_g4808
Aspect correction adds -0.00043 degrees (-0.103 sec of time = -1.22 arc sec) to RA
Aspect correction adds 0.00177 degrees ( 6.36 arcsec) to Dec
Total aspect correction is 6.48 arcsec
Star catalogs centered at 328.4307 , 37.8567 with radius 3.24 arc min.
n_usno: 349 n_gsc: 272
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 17 matched entries is 0.351" for 1185673_g4808
Mean and std. dev of mag. difference (MAG_DELTA) are 1.618 and 0.374 for 1185673_g4808
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1185673_g4808.
Acceptable entries have no ID, XRT distances < 5.75", 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=328.3750 (21:53:30.00) DEC=37.8280 (+37:49:40.8)
XRT distances are from RA=328.4457 (21:53:46.96) DEC=37.8549 (+37:51:17.8)
Found 4 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
328.4444 37.8563 6.1 -1 USNO-B1 19.38 17.49 18.33
328.4475 37.8572 9.6 -1 USNO-B1 15.99 14.94 15.41
328.4444 37.8561 5.6 -1 GSC2.3 17.58 19.73 18.34
328.4475 37.8570 9.1 -1 GSC2.3 14.71 16.21 15.41
The closest star is 5.63" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=328.44736 (21:53:47.37) dec=37.85715 (+37:51:25.7) +/- 0.6" mag=16.98+/-0.15 dist=9.3 REFID=9 flag=0
There are 14104.356 counts in the bkg source region of 5827.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.421 counts/pixel (5-sig UL in 4" is 19.98 mag) for 1185673_g4808
There are 694.55042 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.473 counts/pixel for 1185673_g4808
There are 2793.4248 counts in the xrt_bkg source region of 1158.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.412 counts/pixel (5-sig UL in 4" is 19.99 mag) for 1185673_g4808
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 20.54, XRT distances < 5.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1185673_713899737_230817d03h25m28s739738usUT_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(328.4443,37.8599,45")
fk5;-circle(328.434774402611,37.8587547346037,6")
fk5;-circle(328.447360901922,37.8571522316852,6")
fk5;-circle(328.436234672349,37.8713450552728,6")
fk5;-circle(328.451348527672,37.8570047963502,6")
fk5;-circle(328.441204853716,37.8711860276353,6")
fk5;-circle(328.461065557076,37.8574400335304,6")
fk5;-circle(328.460626843209,37.8646249545854,6")
Region file: 1185673_713899737_230817d03h25m28s739738usUT_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(328.44567,37.85494,8")
Region file: 1185673_713899737_230817d03h25m28s739738usUT_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(328.44567,37.85494,25")
fk5;-circle(328.44567,37.85494,15")
fk5;-circle(328.447360901922,37.8571522316852,6")
fk5;-circle(328.451348527672,37.8570047963502,6")
image paragraph message for exposure 4 of trigger 1185673
SRCLIST PROBLEM: srclist filled telemetry buffer
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 GRB230816 (Swift/BAT trigger 1185673) at 16:08:48 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
4777 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 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 expected extinction corresponding to E(B-V) of
0.312.
------- notes for trigger 1185673 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 230817d03h25m32s628440usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1185673
-expid=713899737 -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/1185673/
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.
*** Warning -- BAT and XRT error circles do NOT overlap.
UVOT exposure began at MET 713899737.49336 or about 2023:228:17:28:52 UT
Found 3254 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 21% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 73 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 17 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. 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
20.54 mag. Found 345 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 22% of the Genie image region.
Genie image analysis:
Found 14104.4 counts in the large background region of 5827.0 pixels or a rate
of 2.421 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 19.80 mag. for a
4-arcsec aperture.
Found 694.6 counts in the XRT position region of 200.0 pixels or a rate of
3.473 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.849 +/- 0.112 (1-sigma) cps or
18.34 mag and a range from 18.20 to 18.49 mag. The 3-sigma UL at the XRT
position is 1.183 cps or 17.98 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.71 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 328.4472 dec= 37.8571 mag=18.09 sep=8.72".
The closest srclist source has ra= 328.4472 dec= 37.8571 mag=18.09 sep=8.72".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 328.4474 dec= 37.8571 mag=16.98 sep=9.30". The closest Genie
source has ra= 328.4474 dec= 37.8571 mag=16.98 sep=9.30".
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 U filter starting
4777 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 21:53:47.37 = 328.44736
DEC(J2000) = +37:51:25.7 = 37.85715
with a 90%-confidence error radius of about 0.62 arc sec. This position is 9.30
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.98 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.312.
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?
713899737 4776 U srclist found no candidates.
713899737 4776 U image found no candidates.
List afterglow candidates for other finding charts.
713895053 92 WHITE srclist found no candidates.
713895053 92 WHITE image found no candidates.
713895266 305 U srclist found no candidates.
713895266 305 U image found no candidates.
713895821 860 WHITE srclist found no candidates.
713895821 860 WHITE image found no candidates.
713899992 5031 B srclist found no candidates.
713899992 5031 B image found no candidates.
713900561 5600 B srclist found no candidates.
713900561 5600 B image found no candidates.
713900873 5912 U srclist found no candidates.
713900873 5912 U image found no candidates.
713901129 6168 B srclist found no candidates.
713901129 6168 B image found no candidates.
713905487 10526 ? srclist data are not available.
713905487 10526 U image found no candidates.
713905742 10781 ? srclist data are not available.
713905742 10781 B image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 37.85494
GRB_ERROR: 5.75
GRB_RA: 328.44567
IMAGE_START_TIME: 17:28:52
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT