image overlap message for exposure 2 of trigger 1220736
uvot_overlap.pl vrs. 2010-12-20b fem started at 240408d15h28m23s586585usUT
The observation of trigger 1220736 started 2024-04-08T15:19:27.2
Examining file 1220736_g332_uvot_sky_image.fits
The exposure ID is 734282367
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (236.9866,-62.5690) with a roll angle of 134.8
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 (236.9470,-62.5340) with a radius of 3.000 arc min
This is 2.367 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 5.02 sq. arc min or 0.18 of the BAT error circle
The XRT error circle is centered at (236.9760,-62.5656) with a radius of 0.080 arc min
This is 0.357 arc min from the center of the uvot region
The area of the XRT error circle is 0.020 sq. arc min
The UVOT/XRT overlap is 0.020 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1220736
find_uvot_ag.pl vrs. 2023-04-25a fem started at 240408d15h28m24s468043usUT
Observation start time is 2024-04-08T15:19:27.2
Examining file 1220736_g332_uvot_catalog_image.fits
The exposure ID is 734282367
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 40 detected source(s) for 1220736_g332
Aspect correction adds 0.00199 degrees (0.478 sec of time = 3.30 arc sec) to RA
Aspect correction adds -0.00219 degrees (-7.87 arcsec) to Dec
Total aspect correction is 8.53 arcsec
Star catalogs centered at 236.9869 , -62.5669 with radius 2.77 arc min.
n_usno: 1372 n_gsc: 729
*** WARNING -- bright star catalog has 5 entries brighter than 12 mag
The brightest has mag 11.45292
RA DEC Mag Color
bright star 0: 236.98024 (15:47:55.26) -62.55726 (-62:33:26.2) 11.69 USNO-V
bright star 1: 237.00790 (15:48:01.90) -62.56121 (-62:33:40.4) 11.57 USNO-V
bright star 2: 237.00319 (15:48:00.77) -62.55029 (-62:33:01.0) 11.45 USNO-V
bright star 3: 237.00487 (15:48:01.17) -62.54923 (-62:32:57.2) 11.73 USNO-V
bright star 4: 237.01718 (15:48:04.12) -62.54043 (-62:32:25.5) 11.97 GSC-V
Mean distance difference (CAT_DELTA) for 49 matched entries is 1.051" for 1220736_g332
Mean and std. dev of mag. difference (MAG_DELTA) are 2.560 and 1.055 for 1220736_g332
Found 2 entries without IDs and 1 entries that are acceptable afterglow candidates for 1220736_g332.
Acceptable entries have no ID, XRT distances < 12", 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=236.9470 (15:47:47.28) DEC=-62.5340 (-62:32:02.4)
XRT distances are from RA=236.9760 (15:47:54.24) DEC=-62.5656 (-62:33:56.2)
-----------------
Entry 10 in the list of sources is a candidate afterglow for 1220736_g332 with genie
ra=236.98555 (15:47:56.53) dec=-62.57620 (-62:34:34.3) +/- 0.9" mag=19.21+/-0.21
dist=41.3 REFID=30 major=0.8 minor=0.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 164.8 arc sec from the BAT position.
Found 40 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
236.9851 -62.5712 18.0 -1 USNO-B1 17.60 17.91 17.78
236.9788 -62.5717 19.8 -1 USNO-B1 18.24 21.13 19.85
236.9832 -62.5736 10.2 -1 USNO-B1 17.05 16.12 16.53
236.9831 -62.5738 9.7 -1 USNO-B1 16.79 16.29 16.51
236.9883 -62.5745 7.8 -1 USNO-B1 17.37 16.54 16.91
236.9765 -62.5736 17.7 -1 USNO-B1 19.94 20.11 20.03
236.9907 -62.5750 9.6 -1 USNO-B1 16.23 15.18 15.64
236.9804 -62.5750 9.7 -1 USNO-B1 15.89 14.63 15.19
236.9932 -62.5751 13.3 -1 USNO-B1 99.99 18.94 99.99
236.9814 -62.5754 7.5 -1 USNO-B1 16.78 15.11 15.85
236.9815 -62.5756 7.1 -1 USNO-B1 99.99 17.20 99.99
236.9954 -62.5752 16.8 -1 USNO-B1 19.28 19.65 19.49
236.9829 -62.5759 4.5 -1 USNO-B1 17.20 17.11 17.15
236.9851 -62.5762 0.8 -1 USNO-B1 17.70 15.97 16.74 *
236.9831 -62.5762 4.1 -1 USNO-B1 18.18 17.10 17.58
236.9737 -62.5753 20.0 -1 USNO-B1 19.10 18.44 18.73
236.9782 -62.5768 12.4 -1 USNO-B1 16.96 17.07 17.02
236.9849 -62.5777 5.4 -1 USNO-B1 17.42 17.64 17.54
236.9837 -62.5783 8.0 -1 USNO-B1 18.26 16.70 17.39
236.9940 -62.5785 16.2 -1 USNO-B1 17.56 18.53 18.10
236.9774 -62.5784 15.8 -1 USNO-B1 16.97 17.59 17.31
236.9833 -62.5794 12.1 -1 USNO-B1 16.63 16.33 16.46
236.9890 -62.5795 13.2 -1 USNO-B1 17.36 19.15 18.36
236.9744 -62.5782 19.8 -1 USNO-B1 17.01 16.63 16.80
236.9822 -62.5795 13.3 -1 USNO-B1 17.06 16.79 16.91
236.9759 -62.5790 19.0 -1 USNO-B1 17.72 17.64 17.68
236.9824 -62.5815 19.6 -1 USNO-B1 19.68 19.26 19.45
236.9849 -62.5712 18.0 -1 GSC2.3 18.56 19.95 99.99
236.9832 -62.5735 10.4 -1 GSC2.3 17.18 18.39 99.99
236.9877 -62.5744 7.3 -1 GSC2.3 18.04 18.72 99.99
236.9908 -62.5750 9.7 -1 GSC2.3 15.60 17.70 16.38
236.9800 -62.5748 10.4 -1 GSC2.3 15.64 16.41 16.11
236.9951 -62.5752 16.3 -1 GSC2.3 19.09 20.37 99.99
236.9857 -62.5762 0.2 -1 GSC2.3 16.72 17.86 17.49 *
236.9780 -62.5769 12.8 -1 GSC2.3 17.02 18.75 99.99
236.9836 -62.5781 7.5 -1 GSC2.3 17.79 19.12 99.99
236.9939 -62.5785 16.0 -1 GSC2.3 18.67 19.75 99.99
236.9886 -62.5795 13.0 -1 GSC2.3 18.84 19.82 99.99
236.9832 -62.5795 12.5 -1 GSC2.3 16.93 18.80 17.10
236.9821 -62.5814 19.7 -1 GSC2.3 20.13 20.90 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
Found 6 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
236.9782 -62.5674 7.3 -1 USNO-B1 15.25 14.10 14.61
236.9781 -62.5672 6.7 -1 USNO-B1 14.99 13.96 14.42
236.9778 -62.5669 5.6 -1 USNO-B1 15.46 14.23 14.78
236.9766 -62.5655 1.1 -1 USNO-B1 15.95 15.04 15.45
236.9783 -62.5674 7.4 -1 GSC2.3 14.72 15.27 15.12
236.9762 -62.5654 0.7 -1 GSC2.3 15.92 17.01 16.45
The closest star is 0.73" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=236.97608 (15:47:54.26) dec=-62.56546 (-62:33:55.7) +/- 0.8" mag=17.87+/-0.15 dist=0.5 REFID=20 flag=3
Matched source ra=236.97832 (15:47:54.80) dec=-62.56730 (-62:34:02.3) +/- 0.7" mag=16.43+/-0.14 dist=7.2 REFID=21 flag=2
There are 24063.375 counts in the bkg source region of 5250.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.583 counts/pixel (5-sig UL in 4" is 19.64 mag) for 1220736_g332
There are 1808.1003 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 9.132 counts/pixel for 1220736_g332
There are 4111.0361 counts in the xrt_bkg source region of 1087.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 3.782 counts/pixel (5-sig UL in 4" is 19.74 mag) for 1220736_g332
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 20.19, XRT distances < 12",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1220736_734282367_240408d15h28m24s468043usUT_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(236.9866,-62.5690,45")
fk5;-circle(236.976082079091,-62.5654638349092,6")
fk5;-circle(236.978320928007,-62.5672998612415,6")
fk5;-circle(236.969275112621,-62.5626864909461,6")
fk5;-circle(236.962878251885,-62.5659219720703,6")
fk5;-circle(236.980033183803,-62.5747462113418,6")
fk5;-circle(236.980260937894,-62.5570434733922,6")
fk5;-circle(236.985548500424,-62.5762044601569,6")
fk5;-circle(236.998321876078,-62.5717389999973,6")
fk5;-circle(236.999333906977,-62.5733119980002,6")
fk5;-circle(237.004986154896,-62.570715430598,6")
fk5;-circle(237.007723449476,-62.5612241207611,6")
fk5;-circle(236.99229356113,-62.5818564629643,6")
Region file: 1220736_734282367_240408d15h28m24s468043usUT_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(236.9760,-62.5656,8")
Region file: 1220736_734282367_240408d15h28m24s468043usUT_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(236.9760,-62.5656,25")
fk5;-circle(236.9760,-62.5656,15")
fk5;-circle(236.969275112621,-62.5626864909461,6")
fk5;-circle(236.962878251885,-62.5659219720703,6")
image paragraph message for exposure 2 of trigger 1220736
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.
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 GRB240408 (Swift/BAT trigger 1220736) at 15:13:54 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
299 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 expected extinction corresponding to E(B-V) of
0.287.
------- notes for trigger 1220736 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 240408d15h28m26s036803usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1220736
-expid=734282367 -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/1220736/
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 734282367.24944 or about 2024:099:15:19:22 UT
Found 5000 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 87% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 30 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 40 source(s) in Genie image catalog. 2 source(s) are within 10.0" of the
xrt position. 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
20.19 mag. Found 1368 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 123% of the Genie image region.
Genie image analysis:
Found 24063.4 counts in the large background region of 5250.0 pixels or a rate
of 4.584 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 19.45 mag. for a
4-arcsec aperture.
Found 1808.1 counts in the XRT position region of 198.0 pixels or a rate of
9.132 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 4.237 +/- 0.176 (1-sigma) cps or
16.58 mag and a range from 16.54 to 16.63 mag. The 3-sigma UL at the XRT
position is 4.766 cps or 16.46 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.52 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 236.9785 dec= -62.5671 mag=17.23 sep=6.95".
The closest srclist source has ra= 236.9785 dec= -62.5671 mag=17.23 sep=6.95".
Found 2 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 236.9761 dec= -62.5655 mag=17.87 sep=0.51". The closest Genie
source has ra= 236.9761 dec= -62.5655 mag=17.87 sep=0.51".
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 U filter starting
299 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 15:47:54.26 = 236.97608
DEC(J2000) = -62:33:55.7 = -62.56546
with a 90%-confidence error radius of about 0.77 arc sec. This position is 0.51
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.87 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.287.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 250 seconds with the U filter starting
299 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 15:47:54.85 = 236.97853
DEC(J2000) = -62:34:01.7 = -62.56714
with a 90%-confidence error radius of about 1.10 arc sec. This position is 6.95
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.23 with a 1-sigma error of about 0.35. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.287.
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?
734282367 299 U srclist found no candidates.
734282367 299 U image found no candidates.
List afterglow candidates for other finding charts.
734282209 141 WHITE srclist found no candidates.
734282209 141 WHITE image found no candidates.
------- Tokens for Quick GCN -------