image overlap message for exposure 1 of trigger 1064221
uvot_overlap.pl vrs. 2010-12-20b fem started at 210807d16h11m35s956065usUT
The observation of trigger 1064221 started 2021-08-07T10:07:38.1
Examining file ./1064221_g237_uvot_sky_image.fits
The exposure ID is 650023658
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (76.6908,58.2477) with a roll angle of 106.6
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 (76.6770,58.2450) with a radius of 3.000 arc min
This is 0.464 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 (76.6838,58.2498) with a radius of 0.035 arc min
This is 0.256 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1064221
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210807d16h11m39s699846usUT
Observation start time is 2021-08-07T10:07:38.1
Examining file ./1064221_g237_uvot_catalog_image.fits
The exposure ID is 650023658
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 20 detected source(s) for 1064221_g237
Aspect correction adds 0.00230 degrees (0.553 sec of time = 4.37 arc sec) to RA
Aspect correction adds 0.00094 degrees ( 3.38 arcsec) to Dec
Total aspect correction is 5.52 arcsec
Star catalogs centered at 76.6997 , 58.2466 with radius 2.63 arc min.
n_usno: 143 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.67034
RA DEC Mag Color
bright star 0: 76.70169 (05:06:48.41) 58.22293 (+58:13:22.5) 10.67 USNO-V
Mean distance difference (CAT_DELTA) for 20 matched entries is 0.639" for 1064221_g237
Mean and std. dev of mag. difference (MAG_DELTA) are 1.121 and 1.317 for 1064221_g237
Found 4 entries without IDs and 1 entries that are acceptable afterglow candidates for 1064221_g237.
Acceptable entries have no ID, XRT distances < 5.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
3 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=76.6770 (05:06:42.48) DEC=58.2450 (+58:14:42.0)
XRT distances are from RA=76.6838 (05:06:44.10) DEC=58.2498 (+58:14:59.3)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1064221_g237 with genie
ra=76.68293 (05:06:43.90) dec=58.24978 (+58:14:59.2) +/- 0.6" mag=17.00+/-0.14
dist=1.6 REFID=9 major=1.0 minor=0.9 flag=0
Found 0 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)
uvot_check_outside found 14 of 14 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=76.68293 (05:06:43.90) dec=58.24978 (+58:14:59.2) +/- 0.6" mag=17.00+/-0.14 dist=1.6 REFID=9 flag=0
There are 1.5826025E+05 counts in the bkg source region of 5930.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 26.688 counts/pixel (5-sig UL in 4" is 19.57 mag) for 1064221_g237
There are 3208.0537 counts in the src source region of 50.000000 pixels.
Rate in src region with 4 arcsec radius is 64.161 counts/pixel for 1064221_g237
There are 33731.051 counts in the cand_src_bkg source region of 1246.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 27.071 counts/pixel (5-sig UL in 4" is 19.56 mag) for 1064221_g237
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 < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1064221_650023658_210807d16h11m39s699846usUT_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(76.6908,58.2477,45")
fk5;-circle(76.6829255621869,58.2497836184911,6")
fk5;-circle(76.6936511784285,58.2566816066962,6")
fk5;-circle(76.6803903050408,58.2364791396076,6")
fk5;-circle(76.7111411276878,58.2438546350903,6")
Region file: 1064221_650023658_210807d16h11m39s699846usUT_cand_src.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(76.6829255621869,58.2497836184911,4")
Region file: 1064221_650023658_210807d16h11m39s699846usUT_cand_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(76.6829255621869,58.2497836184911,25")
fk5;-circle(76.6829255621869,58.2497836184911,15")
image paragraph message for exposure 1 of trigger 1064221
------ Start for Possible Stand-alone Circular ----
In response to GRB210807 (Swift/BAT trigger 1064221) at 10:03:40 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 210 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 05:06:43.90 = 76.68293
DEC(J2000) = +58:14:59.2 = 58.24978
with a 90%-confidence error radius of about 0.61 arc sec. This position is 1.6
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.00 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.408.
------- notes for trigger 1064221 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210807d16h11m44s489598usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1064221
-expid=650023658 -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/1064221/
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 650023658.12562 or about 2021:219:10:07:33 UT
Found 782 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 14% of the srclist region. Found 80 sources in
srclist catalog. Found 5 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 20 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 4 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.12 mag. Found 139 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 13% of the Genie image region.
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?
650023658 210 WHITE 76.68282 58.24979 17.49/19.2 1.8 srclist Yes
650023658 210 WHITE 76.68293 58.24978 17.00/20.1 1.6 image Yes
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 58.24978
GRB_ERROR: 0.61
GRB_RA: 76.68293
IMAGE_START_TIME: 10:07:33
MAGNITUDE: 17.00
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT