image overlap message for exposure 1 of trigger 1051453
uvot_overlap.pl vrs. 2010-12-20b fem started at 210527d14h45m53s141545usUT
The observation of trigger 1051453 started 2021-05-27T08:00:58.8
Examining file ./1051453_g3189_uvot_sky_image.fits
The exposure ID is 643795258
The exposure time is 149.846 (seconds)
The filter is WHITE.
The uvot region is centered at (172.3512,31.6225) with a roll angle of 297.5
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 (172.3550,31.6180) with a radius of 3.000 arc min
This is 0.334 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 (172.3208,31.6262) with a radius of 0.038 arc min
This is 1.568 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1051453
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210527d14h45m57s394133usUT
Observation start time is 2021-05-27T08:00:58.8
Examining file ./1051453_g3189_uvot_sources_image.fits
The exposure ID is 643795258
The exposure is 149.846 sec.
The bin size is 2 pixels
The filter is WHITE
There are 0 detected source(s) for 1051453_g3189
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 172.3264 , 31.6184 with radius 2.00 arc min.
n_usno: 38 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1051453_g3189.
Acceptable entries have no ID, XRT distances < 5.75", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
Magnitude criteria will be applied later.
BAT distances are from RA=172.3550 (11:29:25.20) DEC=31.6180 (+31:37:04.8)
XRT distances are from RA=172.3208 (11:29:17.00) DEC=31.6262 (+31:37:34.3)
Found 1 entries in star catalog(s) within 20" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
172.3259 31.6274 16.2 -1 USNO-B1 21.35 20.29 20.76
The closest star is 16.18" away.
List UVOT sources within 20" of the XRT position:
There are 1.4991944E+05 counts in the bkg source region of 6309.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 23.763 counts/pixel (5-sig UL in 4" is 19.63 mag) for 1051453_g3189
There are 4642.4927 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 23.097 counts/pixel for 1051453_g3189
XRT source is too far (94.0414603487296") from center -- do not compute local background.
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 20.18, XRT distances < 5.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Results are questionable because aspect solution FAILED.
Region file: 1051453_643795258_210527d14h45m57s394133usUT_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(172.3512,31.6225,45")
Region file: 1051453_643795258_210527d14h45m57s394133usUT_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(172.32083,31.62619,8")
image paragraph message for exposure 1 of trigger 1051453
------ Start for Possible Stand-alone Circular ----
In response to GRB210527 (Swift/BAT trigger 1051453) at 07:07:48 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 3162 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
19.6 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 mag. No correction has been made for the expected extinction
corresponding to E(B-V) of 0.023.
------- notes for trigger 1051453 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210527d14h46m01s282403usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1051453
-expid=643795258 -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/1051453/
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 643795258.77236 or about 2021:147:08:00:53 UT
Found 241 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 16 sources in
srclist catalog. Found 2 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 0 source(s) in Genie image catalog. Found 0 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.18 mag. Found 34 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 5% of the
Genie image region.
Genie image analysis:
Found 149919.4 counts in the large background region of 6309.0 pixels or a rate
of 23.763 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 4642.5 counts in the XRT position region of 201.0 pixels or a rate of
23.097 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.892 +/- 0.462 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.385 cps or 19.25 mag. The closest srclist
source has ra= 172.3332 dec= 31.6073 mag=19.65 sep=77.87".
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?
643795258 3162 WHITE srclist found no candidates.
643795258 3162 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 31.62619
GRB_ERROR: 5.75
GRB_RA: 172.32083
IMAGE_START_TIME: 08:00:53
MAGNITUDE: 19.2
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT