image overlap message for exposure 3 of trigger 1057131
uvot_overlap.pl vrs. 2010-12-20b fem started at 210621d17h29m14s078492usUT
The observation of trigger 1057131 started 2021-06-21T17:19:25.1
Examining file 1057131_g888_uvot_sky_image.fits
The exposure ID is 645988765
The exposure time is 149.857 (seconds)
The filter is WHITE.
*** Warning -- found 15827 null pixels in the image.
The uvot region is centered at (238.8057,-54.0673) 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 0.341 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 at most 5.30 sq. arc min or 0.19 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 0.765 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 0.00 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 3 of trigger 1057131
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210621d17h29m15s309699usUT
Observation start time is 2021-06-21T17:19:25.1
Examining file 1057131_g888_uvot_catalog_image.fits
The exposure ID is 645988765
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 12 detected source(s) for 1057131_g888
Aspect correction adds -0.00094 degrees (-0.226 sec of time = -1.99 arc sec) to RA
Aspect correction adds -0.00050 degrees (-1.80 arcsec) to Dec
Total aspect correction is 2.68 arcsec
Star catalogs centered at 238.8162 , -54.0669 with radius 2.61 arc min.
n_usno: 417 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 0.594" for 1057131_g888
Mean and std. dev of mag. difference (MAG_DELTA) are 1.580 and 0.623 for 1057131_g888
Found 2 entries without IDs and 0 entries that are acceptable afterglow candidates for 1057131_g888.
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.
2 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)
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 1:
ra=238.79738 dec=-54.07621 +/- 0.6" mag=14.63+/-0.14 dist=58.2 REFID=5 flag=3
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 25118.453 counts in the bkg source region of 1345.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 18.675 counts/pixel (5-sig UL in 4" is 19.76 mag) for 1057131_g888
There are 0.0000000 counts in the xrt source region of 0.0000000 pixels.
There are 0.0000000 counts in the xrt_bkg source region of 0.0000000 pixels.
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 20.32, 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_645988765_210621d17h29m15s309699usUT_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(238.8057,-54.0673,45")
fk5;-circle(238.821845216245,-54.0766801776471,6")
fk5;-circle(238.797381807457,-54.0762071186505,6")
fk5;-circle(238.797707307911,-54.0773575430366,6")
Region file: 1057131_645988765_210621d17h29m15s309699usUT_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_645988765_210621d17h29m15s309699usUT_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")
image paragraph message for exposure 3 of trigger 1057131
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no overlap
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 861 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 none of
the XRT error circle. The 8'x8' region for the list of sources generated
on-board covers 0.00% of the XRT error circle. 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 210621d17h29m18s116496usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1057131
-expid=645988765 -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 645988765.07732 or about 2021:172:17:19:20 UT
Found 3181 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 36% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 33 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 12 source(s) in Genie image catalog. 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 20.32 mag. Found 413 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
42% of the Genie image region. The Genie image is INCOMPLETE with 15827 null
pixels.
Genie image analysis:
Found 25118.5 counts in the large background region of 1345.0 pixels or a rate
of 18.675 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 19.58 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 18.66 mag. The closest srclist
source has ra= 238.7973 dec= -54.0760 mag=13.86 sep=57.62". The closest Genie
source has ra= 238.7974 dec= -54.0762 mag=14.63 sep=58.22".
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?
645988765 861 WHITE srclist found no candidates.
645988765 861 WHITE 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.
645988161 257 U srclist found no candidates.
645988161 257 U image found no candidates.
------- Tokens for Quick GCN -------