image overlap message for exposure 1 of trigger 1110821
uvot_overlap.pl vrs. 2010-12-20b fem started at 220618d13h18m14s604446usUT
The observation of trigger 1110821 started 2022-06-18T09:13:30.6
Examining file ./1110821_g180_uvot_sky_image.fits
The exposure ID is 677236410
The exposure time is 149.846 (seconds)
The filter is WHITE.
*** Warning -- found 7399 null pixels in the image.
The uvot region is centered at (38.9910,55.2134) with a roll angle of 112.3
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 (38.9660,55.2140) with a radius of 3.000 arc min
This is 0.856 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 (38.9860,55.2157) with a radius of 0.037 arc min
This is 0.218 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 1110821
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220618d13h18m20s984986usUT
Observation start time is 2022-06-18T09:13:30.6
Examining file ./1110821_g180_uvot_catalog_image.fits
The exposure ID is 677236410
The exposure is 149.846 sec.
The bin size is 2 pixels
The filter is WHITE
There are 23 detected source(s) for 1110821_g180
Aspect correction adds 0.00143 degrees (0.344 sec of time = 2.95 arc sec) to RA
Aspect correction adds -0.00042 degrees (-1.51 arcsec) to Dec
Total aspect correction is 3.31 arcsec
Star catalogs centered at 38.9885 , 55.2127 with radius 2.59 arc min.
n_usno: 275 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 24 matched entries is 0.433" for 1110821_g180
Mean and std. dev of mag. difference (MAG_DELTA) are 0.738 and 0.336 for 1110821_g180
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1110821_g180.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=38.9660 (02:35:51.84) DEC=55.2140 (+55:12:50.4)
XRT distances are from RA=38.9860 (02:35:56.65) DEC=55.2157 (+55:12:56.4)
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
38.9885 55.2171 7.2 -1 USNO-B1 18.98 17.33 18.06
The closest star is 7.20" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=38.98860 (02:35:57.26) dec=55.21710 (+55:13:01.6) +/- 0.7" mag=19.10+/-0.17 dist=7.4 REFID=12 flag=0
There are 1.3399420E+05 counts in the bkg source region of 5011.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 26.740 counts/pixel (5-sig UL in 4" is 19.57 mag) for 1110821_g180
There are 5755.0308 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 28.632 counts/pixel for 1110821_g180
There are 30416.291 counts in the xrt_bkg source region of 1140.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 26.681 counts/pixel (5-sig UL in 4" is 19.57 mag) for 1110821_g180
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 < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1110821_677236410_220618d13h18m20s984986usUT_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(38.9910,55.2134,45")
fk5;-circle(38.972664479118,55.2146724099233,6")
fk5;-circle(38.9885982789112,55.2171033385461,6")
fk5;-circle(38.9706024527935,55.221013285571,6")
fk5;-circle(38.9945085976238,55.2198230603689,6")
fk5;-circle(38.9991418750748,55.2129947245166,6")
fk5;-circle(38.9835506844961,55.2054501075123,6")
fk5;-circle(38.9938213803677,55.2270598694712,6")
fk5;-circle(39.0007697136913,55.2073222398343,6")
fk5;-circle(39.01000446414,55.2221029273836,6")
fk5;-circle(39.0115204150769,55.2173448672123,6")
fk5;-circle(39.0058531516459,55.2064515344407,6")
fk5;-circle(39.0121122962817,55.2092583384342,6")
Region file: 1110821_677236410_220618d13h18m20s984986usUT_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(38.98604,55.21567,8")
Region file: 1110821_677236410_220618d13h18m20s984986usUT_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(38.98604,55.21567,25")
fk5;-circle(38.98604,55.21567,15")
fk5;-circle(38.972664479118,55.2146724099233,6")
fk5;-circle(38.9945085976238,55.2198230603689,6")
fk5;-circle(38.9991418750748,55.2129947245166,6")
image paragraph message for exposure 1 of trigger 1110821
SRCLIST PROBLEM: srclist filled telemetry buffer
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB220618 (Swift/BAT trigger 1110821) at 09:10:29 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 151 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 large, but uncertain, extinction expected.
------- notes for trigger 1110821 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 220618d13h18m25s425921usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1110821
-expid=677236410 -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/1110821/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
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 677236410.58616 or about 2022:169:09:13:25 UT
Found 1472 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 27% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 11 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 23 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. 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
20.12 mag. Found 271 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 28% of the Genie image region. The
Genie image is INCOMPLETE with 7399 null pixels.
Genie image analysis:
Found 133994.2 counts in the large background region of 5011.0 pixels or a rate
of 26.740 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 19.39 mag. for a
4-arcsec aperture.
Found 5755.0 counts in the XRT position region of 201.0 pixels or a rate of
28.632 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 2.614 +/- 0.546 (1-sigma) cps or
18.56 mag and a range from 18.36 to 18.82 mag. The 3-sigma UL at the XRT
position is 4.251 cps or 18.03 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.88 mag. The closest
srclist source has ra= 38.9945 dec= 55.2199 mag=15.13 sep=23.19".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 38.9886 dec= 55.2171 mag=19.10 sep=7.36". The closest Genie
source has ra= 38.9886 dec= 55.2171 mag=19.10 sep=7.36".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 151 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 02:35:57.26 = 38.98860
DEC(J2000) = +55:13:01.6 = 55.21710
with a 90%-confidence error radius of about 0.67 arc sec. This position is 7.36
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.10 with a 1-sigma error of about 0.17. No correction has been made for the
large, but uncertain, extinction expected.
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?
677236410 150 WHITE srclist found no candidates.
677236410 150 WHITE image found no candidates.
List afterglow candidates for other finding charts.
677236568 308 U srclist found no candidates.
677236568 308 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 55.21567
GRB_ERROR: 5.5
GRB_RA: 38.98604
IMAGE_START_TIME: 09:13:25
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT