image overlap message for exposure 2 of trigger 1150107
uvot_overlap.pl vrs. 2010-12-20b fem started at 230121d06h00m24s903147usUT
The observation of trigger 1150107 started 2023-01-21T05:49:29.5
Examining file 1150107_g311_uvot_sky_image.fits
The exposure ID is 695972969
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (70.2427,44.5290) with a roll angle of 281.6
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 (70.2670,44.5250) with a radius of 3.000 arc min
This is 1.068 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 (70.2493,44.5309) with a radius of 0.083 arc min
This is 0.304 arc min from the center of the uvot region
The area of the XRT error circle is 0.022 sq. arc min
The UVOT/XRT overlap is 0.022 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1150107
find_uvot_ag.pl vrs. 2020-10-30 fem started at 230121d06h00m26s087783usUT
Observation start time is 2023-01-21T05:49:29.5
Examining file 1150107_g311_uvot_catalog_image.fits
The exposure ID is 695972969
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 3 detected source(s) for 1150107_g311
Aspect correction adds -0.00080 degrees (-0.192 sec of time = -2.05 arc sec) to RA
Aspect correction adds -0.00077 degrees (-2.77 arcsec) to Dec
Total aspect correction is 3.45 arcsec
Star catalogs centered at 70.2505 , 44.5219 with radius 2.45 arc min.
n_usno: 144 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.54854
RA DEC Mag Color
bright star 0: 70.24719 (04:40:59.33) 44.53037 (+44:31:49.3) 10.55 USNO-V
Mean distance difference (CAT_DELTA) for 2 matched entries is 0.567" for 1150107_g311
Mean and std. dev of mag. difference (MAG_DELTA) are 1.017 and 0.063 for 1150107_g311
Found 1 entries without IDs and 0 entries that are acceptable afterglow candidates for 1150107_g311.
Acceptable entries have no ID, XRT distances < 12.5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
1 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=70.2670 (04:41:04.08) DEC=44.5250 (+44:31:30.0)
XRT distances are from RA=70.2493 (04:40:59.83) DEC=44.5309 (+44:31:51.2)
*** WARNING 33 per cent of entries have no IDs.
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 0:
ra= 70.24743 dec= 44.53166 +/- 0.7" mag=12.28+/-0.14 dist=5.5 REFID=2 flag=2
Found 1 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
70.2472 44.5304 5.7 -1 USNO-B1 10.98 10.20 10.55
The closest star is 5.73" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=70.24743 (04:40:59.38) dec=44.53166 (+44:31:54.0) +/- 0.7" mag=12.28+/-0.14 dist=5.5 REFID=2 flag=2
Matched source ra=70.24699 (04:40:59.28) dec=44.53042 (+44:31:49.5) +/- 0.7" mag=11.70+/-0.14 dist=6.2 REFID=3 flag=3
There are 43129.992 counts in the bkg source region of 6145.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.019 counts/pixel (5-sig UL in 4" is 19.41 mag) for 1150107_g311
There are 23211.879 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 117.232 counts/pixel for 1150107_g311
There are 14975.672 counts in the xrt_bkg source region of 1249.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 11.990 counts/pixel (5-sig UL in 4" is 19.12 mag) for 1150107_g311
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 19.96, XRT distances < 12.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1150107_695972969_230121d06h00m26s087783usUT_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(70.2427,44.5290,45")
fk5;-circle(70.247428208883,44.5316644727907,6")
fk5;-circle(70.2469900627032,44.5304177560051,6")
Region file: 1150107_695972969_230121d06h00m26s087783usUT_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(70.2493,+44.5309,8")
Region file: 1150107_695972969_230121d06h00m26s087783usUT_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(70.2493,+44.5309,25")
fk5;-circle(70.2493,+44.5309,15")
image paragraph message for exposure 2 of trigger 1150107
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
2 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 GRB230121 (Swift/BAT trigger 1150107) at 05:44:17 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
281 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 large, but uncertain, extinction expected.
------- notes for trigger 1150107 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 230121d06h00m27s630223usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1150107
-expid=695972969 -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/1150107/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for bat position. 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 695972969.46698 or about 2023:021:05:49:24 UT
Found 1029 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 18% of the srclist region. Found 103 sources in
srclist catalog. Found 64 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 3 source(s) in Genie image catalog. 2 source(s) are within 10.0" of the
xrt position. 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
19.96 mag. Found 140 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 16% of the Genie image region.
Genie image analysis:
Found 43130.0 counts in the large background region of 6145.0 pixels or a rate
of 7.019 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 19.23 mag. for a
4-arcsec aperture.
Found 23211.9 counts in the XRT position region of 198.0 pixels or a rate of
117.232 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 83.351 +/- 0.614 (1-sigma) cps or
13.36 mag and a range from 13.36 to 13.37 mag. The 3-sigma UL at the XRT
position is 85.194 cps or 13.34 mag.
Found 12 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 70.2495 dec= 44.5320 mag=18.42 sep=3.83".
The closest srclist source has ra= 70.2495 dec= 44.5320 mag=18.42 sep=3.83".
Found 2 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 70.2474 dec= 44.5317 mag=12.28 sep=5.54". The closest Genie
source has ra= 70.2474 dec= 44.5317 mag=12.28 sep=5.54".
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
281 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 04:40:59.38 = 70.24743
DEC(J2000) = +44:31:54.0 = 44.53166
with a 90%-confidence error radius of about 0.74 arc sec. This position is 5.54
arc sec. from the center of the XRT error circle. The estimated magnitude is
12.28 with a 1-sigma error of about 0.14. No correction has been made for the
large, but uncertain, extinction expected.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 250 seconds with the U filter starting
281 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 04:40:59.88 = 70.24951
DEC(J2000) = +44:31:55.0 = 44.53195
with a 90%-confidence error radius of about 1.10 arc sec. This position is 3.83
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.42 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?
695972969 281 U srclist found no candidates.
695972969 281 U image found no candidates.
List afterglow candidates for other finding charts.
695972811 123 WHITE srclist found no candidates.
695972811 123 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 44.53090
GRB_ERROR: 12.5
GRB_RA: 70.24930
IMAGE_START_TIME: 05:49:24
MAGNITUDE: 13.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT