image overlap message for exposure 2 of trigger 1057131
uvot_overlap.pl vrs. 2010-12-20b fem started at 210621d17h27m15s549811usUT
The observation of trigger 1057131 started 2021-06-21T17:09:21.7
Examining file ./1057131_g284_uvot_sky_image.fits
The exposure ID is 645988161
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (238.8072,-54.0670) with a roll angle of 230.5
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 (238.8120,-54.0630) with a radius of 3.000 arc min
This is 0.291 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 (238.7865,-54.0614) with a radius of 0.032 arc min
This is 0.803 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 0.003 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1057131
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210621d17h27m45s874252usUT
Observation start time is 2021-06-21T17:09:21.7
Examining file ./1057131_g284_uvot_catalog_image.fits
The exposure ID is 645988161
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 19 detected source(s) for 1057131_g284
Aspect correction adds -0.00048 degrees (-0.115 sec of time = -1.01 arc sec) to RA
Aspect correction adds -0.00020 degrees (-0.71 arcsec) to Dec
Total aspect correction is 1.24 arcsec
Star catalogs centered at 238.8075 , -54.0662 with radius 2.52 arc min.
n_usno: 380 n_gsc: 0
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 10.71494
RA DEC Mag Color
bright star 0: 238.80655 (15:55:13.57) -54.06409 (-54:03:50.7) 11.70 USNO-R
bright star 1: 238.79818 (15:55:11.56) -54.07666 (-54:04:36.0) 10.71 USNO-V
bright star 2: 238.85814 (15:55:25.95) -54.07434 (-54:04:27.6) 11.40 USNO-V
Mean distance difference (CAT_DELTA) for 11 matched entries is 0.511" for 1057131_g284
Mean and std. dev of mag. difference (MAG_DELTA) are 2.180 and 0.619 for 1057131_g284
Found 8 entries without IDs and 2 entries that are acceptable afterglow candidates for 1057131_g284.
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.
6 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=238.8120 (15:55:14.88) DEC=-54.0630 (-54:03:46.8)
XRT distances are from RA=238.7865 (15:55:08.75) DEC=-54.0614 (-54:03:40.9)
*** WARNING 42 per cent of entries have no IDs.
-----------------
Entry 15 in the list of sources is a candidate afterglow for 1057131_g284 with genie
ra=238.78077 (15:55:07.39) dec=-54.05209 (-54:03:07.5) +/- 0.7" mag=18.12+/-0.16
dist=35.5 REFID=3 major=1.0 minor=0.9 flag=2 (blended)
*** The position of this source is inconsistent with the XRT position.
The position is 76.8 arc sec from the BAT position.
Found 6 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
238.7863 -54.0558 17.7 -1 USNO-B1 17.20 16.10 16.59
238.7782 -54.0548 11.1 -1 USNO-B1 99.99 19.37 99.99
238.7795 -54.0525 3.2 -1 USNO-B1 15.52 14.04 14.70 *
238.7843 -54.0484 15.2 -1 USNO-B1 20.14 19.47 19.77
238.7734 -54.0551 19.0 -1 USNO-B1 19.88 18.81 19.29
238.7780 -54.0497 10.6 -1 USNO-B1 99.99 19.44 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
-----------------
Entry 16 in the list of sources is a candidate afterglow for 1057131_g284 with genie
ra=238.77861 (15:55:06.87) dec=-54.05281 (-54:03:10.1) +/- 0.7" mag=18.21+/-0.16
dist=35.0 REFID=4 major=0.9 minor=0.8 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 79.5 arc sec from the BAT position.
Found 6 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
238.7863 -54.0558 19.5 -1 USNO-B1 17.20 16.10 16.59
238.7782 -54.0548 7.1 -1 USNO-B1 99.99 19.37 99.99
238.7795 -54.0525 2.1 -1 USNO-B1 15.52 14.04 14.70 *
238.7843 -54.0484 19.9 -1 USNO-B1 20.14 19.47 19.77
238.7734 -54.0551 13.8 -1 USNO-B1 19.88 18.81 19.29
238.7780 -54.0497 11.4 -1 USNO-B1 99.99 19.44 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 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
238.7890 -54.0616 5.4 -1 USNO-B1 18.27 17.10 17.62
The closest star is 5.39" away.
List UVOT sources within 10" of the XRT position:
There are 29253.412 counts in the bkg source region of 5539.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.281 counts/pixel (5-sig UL in 4" is 19.56 mag) for 1057131_g284
There are 862.36847 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 4.355 counts/pixel for 1057131_g284
There are 5690.4517 counts in the xrt_bkg source region of 1240.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 4.589 counts/pixel (5-sig UL in 4" is 19.64 mag) for 1057131_g284
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 20.12, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1057131_645988161_210621d17h27m45s874252usUT_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(238.8072,-54.0670,45")
fk5;-circle(238.806407990496,-54.0639586815137,6")
fk5;-circle(238.80358205316,-54.0626867066003,6")
fk5;-circle(238.805755652061,-54.0551154417307,6")
fk5;-circle(238.800957321384,-54.0566674152663,6")
fk5;-circle(238.803287249692,-54.0745600366296,6")
fk5;-circle(238.798113348181,-54.0730408300661,6")
fk5;-circle(238.821895753819,-54.0767366052497,6")
fk5;-circle(238.797814007447,-54.0765075390662,6")
fk5;-circle(238.800666996887,-54.0800538784188,6")
fk5;-circle(238.79240089145,-54.0776115827868,6")
Region file: 1057131_645988161_210621d17h27m45s874252usUT_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(238.78646,-54.06136,8")
Region file: 1057131_645988161_210621d17h27m45s874252usUT_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(238.78646,-54.06136,25")
fk5;-circle(238.78646,-54.06136,15")
fk5;-circle(238.781840060229,-54.0693162646203,6")
image paragraph message for exposure 2 of trigger 1057131
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: srclist filled telemetry buffer
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB210621 (Swift/BAT trigger 1057131) at 17:04:36 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
257 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. 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 1057131 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210621d17h28m00s414357usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1057131
-expid=645988161 -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/1057131/
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 645988161.68692 or about 2021:172:17:09:16 UT
Found 3732 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 35% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 65 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 19 source(s) in Genie image catalog. Found 8 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.12 mag. Found 376 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
41% of the Genie image region.
Genie image analysis:
Found 29253.4 counts in the large background region of 5539.0 pixels or a rate
of 5.281 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 19.41 mag. for a
4-arcsec aperture.
Found 862.4 counts in the XRT position region of 198.0 pixels or a rate of
4.356 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.185 +/- 0.127 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.381 cps or 19.23 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 18.21
mag. The closest srclist source has ra= 238.8033 dec= -54.0628 mag=17.36
sep=35.87". The closest Genie source has ra= 238.7818 dec= -54.0693 mag=18.87
sep=30.26".
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?
645988161 257 U srclist found no candidates.
645988161 257 U image found no candidates.
List afterglow candidates for other finding charts.
645987948 44 WHITE srclist found no candidates.
645987948 44 WHITE image found no candidates.
645988765 861 WHITE srclist found no candidates.
645988765 861 ? image data are not available.
------- Tokens for Quick GCN -------