image overlap message for exposure 1 of trigger 1057131
uvot_overlap.pl vrs. 2010-12-20b fem started at 210621d17h27m14s817406usUT
The observation of trigger 1057131 started 2021-06-21T17:05:48.9
Examining file ./1057131_g71_uvot_sky_image.fits
The exposure ID is 645987948
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (238.8052,-54.0669) 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 0.333 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 0.740 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 1 of trigger 1057131
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210621d17h27m35s297331usUT
Observation start time is 2021-06-21T17:05:48.9
Examining file ./1057131_g71_uvot_catalog_image.fits
The exposure ID is 645987948
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 38 detected source(s) for 1057131_g71
Aspect correction adds -0.00113 degrees (-0.271 sec of time = -2.39 arc sec) to RA
Aspect correction adds -0.00031 degrees (-1.13 arcsec) to Dec
Total aspect correction is 2.64 arcsec
Star catalogs centered at 238.8058 , -54.0662 with radius 2.69 arc min.
n_usno: 431 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 30 matched entries is 0.728" for 1057131_g71
Mean and std. dev of mag. difference (MAG_DELTA) are 1.590 and 0.593 for 1057131_g71
Found 9 entries without IDs and 2 entries that are acceptable afterglow candidates for 1057131_g71.
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.
7 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)
-----------------
Entry 27 in the list of sources is a candidate afterglow for 1057131_g71 with genie
ra=238.77844 (15:55:06.83) dec=-54.05278 (-54:03:10.0) +/- 0.6" mag=16.75+/-0.14
dist=35.2 REFID=4 major=0.8 minor=0.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 79.9 arc sec from the BAT position.
Found 5 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 19.9 -1 USNO-B1 17.20 16.10 16.59
238.7782 -54.0548 7.2 -1 USNO-B1 99.99 19.37 99.99
238.7795 -54.0525 2.4 -1 USNO-B1 15.52 14.04 14.70 *
238.7734 -54.0551 13.6 -1 USNO-B1 19.88 18.81 19.29
238.7780 -54.0497 11.3 -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 32 in the list of sources is a candidate afterglow for 1057131_g71 with genie
ra=238.77094 (15:55:05.03) dec=-54.07169 (-54:04:18.1) +/- 0.6" mag=18.42+/-0.15
dist=49.6 REFID=17 major=0.9 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 92.2 arc sec from the BAT position.
This source is near the edge of image (0.886)
Found 7 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
238.7740 -54.0731 8.1 -1 USNO-B1 16.23 14.95 15.52
238.7755 -54.0759 17.9 -1 USNO-B1 18.25 17.13 17.63
238.7719 -54.0721 2.3 -1 USNO-B1 17.52 16.16 16.76 *
238.7679 -54.0672 17.4 -1 USNO-B1 99.99 20.00 99.99
238.7658 -54.0703 11.9 -1 USNO-B1 17.80 16.83 17.26
238.7633 -54.0743 18.6 -1 USNO-B1 20.96 16.14 18.28
238.7631 -54.0746 19.6 -1 USNO-B1 19.80 17.43 18.48
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" 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 82070.891 counts in the bkg source region of 5032.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 16.310 counts/pixel (5-sig UL in 4" is 19.83 mag) for 1057131_g71
There are 3279.7192 counts in the xrt source region of 202.00000 pixels.
Rate in xrt region with 8 arcsec radius is 16.236 counts/pixel for 1057131_g71
There are 13098.419 counts in the xrt_bkg source region of 1246.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 10.512 counts/pixel (5-sig UL in 4" is 20.07 mag) for 1057131_g71
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 20.39, 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_645987948_210621d17h27m35s297331usUT_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(238.8052,-54.0669,45")
fk5;-circle(238.806241582733,-54.0638876145227,6")
fk5;-circle(238.807470463188,-54.0663280469388,6")
fk5;-circle(238.803435053118,-54.0626805091647,6")
fk5;-circle(238.807991743836,-54.0705426004399,6")
fk5;-circle(238.805476882336,-54.0551053656241,6")
fk5;-circle(238.800764605649,-54.0566313551983,6")
fk5;-circle(238.801887752595,-54.0720038474573,6")
fk5;-circle(238.802558860628,-54.0743740187263,6")
fk5;-circle(238.795450138077,-54.0719802518689,6")
fk5;-circle(238.810573371337,-54.0772614640641,6")
fk5;-circle(238.821730649478,-54.0766066359096,6")
fk5;-circle(238.797412827353,-54.0763621783331,6")
fk5;-circle(238.790307782148,-54.0742893336595,6")
fk5;-circle(238.781661252981,-54.0692752544264,6")
fk5;-circle(238.791843509672,-54.0779298809122,6")
Region file: 1057131_645987948_210621d17h27m35s297331usUT_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_645987948_210621d17h27m35s297331usUT_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(238.781661252981,-54.0692752544264,6")
image paragraph message for exposure 1 of trigger 1057131
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: damaged image (negative pixel value)
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 150 seconds with the White filter
starting 44 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image processing
FAILED because of damaged image (negative pixel value). 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 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 210621d17h27m39s413754usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1057131
-expid=645987948 -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. The Genie image appears to be DAMAGED with a min. value of
-27.515179.
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 645987948.8619 or about 2021:172:17:05:43 UT
Found 2229 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 37% 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 19.22 mag.
Found 38 source(s) in Genie image catalog. Found 9 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.39 mag. Found 427 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
40% of the Genie image region. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.83 mag. The closest
srclist source has ra= 238.7817 dec= -54.0694 mag=17.98 sep=30.72". The closest
Genie source has ra= 238.7817 dec= -54.0693 mag=17.67 sep=30.24".
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?
645987948 44 WHITE srclist found no candidates.
645987948 44 WHITE image found no candidates.
List afterglow candidates for other finding charts.
645988161 257 U srclist found no candidates.
645988161 257 U image found no candidates.
645988765 861 WHITE srclist found no candidates.
645988765 861 ? image data are not available.
------- Tokens for Quick GCN -------