image overlap message for exposure 1 of trigger 1069169
uvot_overlap.pl vrs. 2010-12-20b fem started at 210818d05h22m10s661778usUT
The observation of trigger 1069169 started 2021-08-18T01:03:41.9
Examining file ./1069169_g93_uvot_sky_image.fits
The exposure ID is 650941421
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (148.8737,-87.0201) with a roll angle of 358.5
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 (149.1310,-87.0310) with a radius of 3.000 arc min
This is 1.035 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 (148.8676,-87.0252) with a radius of 0.037 arc min
This is 0.309 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 1069169
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210818d05h22m15s493305usUT
Observation start time is 2021-08-18T01:03:41.9
Examining file ./1069169_g93_uvot_catalog_image.fits
The exposure ID is 650941421
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 17 detected source(s) for 1069169_g93
Aspect correction adds -0.00703 degrees (-1.687 sec of time = -1.31 arc sec) to RA
Aspect correction adds 0.00025 degrees ( 0.90 arcsec) to Dec
Total aspect correction is 1.59 arcsec
Star catalogs centered at 148.9514 , -87.0177 with radius 2.75 arc min.
n_usno: 129 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.35976
RA DEC Mag Color
bright star 0: 148.18330 (09:52:43.99) -87.00261 (-87:00:09.4) 11.36 USNO-V
Mean distance difference (CAT_DELTA) for 15 matched entries is 0.508" for 1069169_g93
Mean and std. dev of mag. difference (MAG_DELTA) are 1.474 and 0.388 for 1069169_g93
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1069169_g93.
Acceptable entries have no ID, XRT distances < 5.5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=149.1310 (09:56:31.44) DEC=-87.0310 (-87:01:51.6)
XRT distances are from RA=148.8676 (09:55:28.23) DEC=-87.0252 (-87:01:30.9)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1069169_g93 with genie
ra=148.86729 (09:55:28.15) dec=-87.02467 (-87:01:28.8) +/- 0.6" mag=17.93+/-0.15
dist=2.1 REFID=8 major=1.1 minor=1.0 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 10 of 10 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 15 in the list of sources is a candidate afterglow for 1069169_g93 with genie
ra=149.43392 (09:57:44.14) dec=-87.01145 (-87:00:41.2) +/- 0.9" mag=20.14+/-0.25
dist=117.3 REFID=5 major=0.5 minor=0.3 flag=16 (aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 93.2 arc sec from the BAT position.
This source is near the edge of image (0.991)
Found 2 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
149.3787 -87.0099 11.8 -1 USNO-B1 19.57 17.93 18.66
149.4541 -87.0121 4.4 -1 USNO-B1 15.22 14.12 14.61 *
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 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=148.86729 (09:55:28.15) dec=-87.02467 (-87:01:28.8) +/- 0.6" mag=17.93+/-0.15 dist=2.1 REFID=8 flag=0
There are 1.6023783E+05 counts in the bkg source region of 6187.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 25.899 counts/pixel (5-sig UL in 4" is 19.58 mag) for 1069169_g93
There are 2053.4812 counts in the src source region of 48.000000 pixels.
Rate in src region with 4 arcsec radius is 42.781 counts/pixel for 1069169_g93
There are 32467.898 counts in the cand_src_bkg source region of 1251.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 25.954 counts/pixel (5-sig UL in 4" is 19.58 mag) for 1069169_g93
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 20.14, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1069169_650941421_210818d05h22m15s493305usUT_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(148.8737,-87.0201,45")
fk5;-circle(148.867286849643,-87.0246724370545,6")
fk5;-circle(148.835036807781,-87.0336822157686,6")
fk5;-circle(148.646188415223,-87.0275729458418,6")
Region file: 1069169_650941421_210818d05h22m15s493305usUT_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(148.867286849643,-87.0246724370545,4")
Region file: 1069169_650941421_210818d05h22m15s493305usUT_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(148.867286849643,-87.0246724370545,25")
fk5;-circle(148.867286849643,-87.0246724370545,15")
image paragraph message for exposure 1 of trigger 1069169
------ Start for Possible Stand-alone Circular ----
In response to GRB210818 (Swift/BAT trigger 1069169) at 01:02:07 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 66 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 09:55:28.15 = 148.86729
DEC(J2000) = -87:01:28.8 = -87.02467
with a 90%-confidence error radius of about 0.62 arc sec. This position is 2.1
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.93 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.213.
------- notes for trigger 1069169 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210818d05h22m20s479993usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1069169
-expid=650941421 -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/1069169/
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 650941421.93616 or about 2021:230:01:03:36 UT
Found 549 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 11% of the srclist region. Found 59 sources in
srclist catalog. Found 6 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 17 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 2 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.14 mag. Found 125 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 11% 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?
650941421 65 WHITE 148.86497 -87.02478 18.59/19.2 1.7 srclist Yes
650941421 65 WHITE 148.86729 -87.02467 17.93/20.1 2.1 image Yes
List afterglow candidates for other finding charts.
650941633 277 U 148.86369 -87.02455 18.21/18.1 1.5 srclist Yes
650941633 277 U image found no candidates.
650942215 859 WHITE 148.86535 -87.02472 18.93/19.2 1.2 srclist Yes
650942215 859 WHITE 148.86762 -87.02478 18.17/20.3 1.5 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -87.02467
GRB_ERROR: 0.62
GRB_RA: 148.86729
IMAGE_START_TIME: 01:03:36
MAGNITUDE: 17.93
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT