image overlap message for exposure 1 of trigger 1108208
uvot_overlap.pl vrs. 2010-12-20b fem started at 220527d22h39m41s013134usUT
The observation of trigger 1108208 started 2022-05-27T22:33:40.0
Examining file 1108208_g542_uvot_sky_image.fits
The exposure ID is 675383620
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (244.9780,-15.6353) with a roll angle of 2.0
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 (244.9830,-15.6560) with a radius of 3.000 arc min
This is 1.274 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 7.14 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (244.9768,-15.6424) with a radius of 0.078 arc min
This is 0.429 arc min from the center of the uvot region
The area of the XRT error circle is 0.019 sq. arc min
The UVOT/XRT overlap is 0.019 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1108208
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220527d22h39m42s530633usUT
Observation start time is 2022-05-27T22:33:40.0
Examining file 1108208_g542_uvot_catalog_image.fits
The exposure ID is 675383620
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 15 detected source(s) for 1108208_g542
Aspect correction adds 0.00242 degrees (0.582 sec of time = 8.40 arc sec) to RA
Aspect correction adds 0.00192 degrees ( 6.91 arcsec) to Dec
Total aspect correction is 10.88 arcsec
Star catalogs centered at 244.9854 , -15.6215 with radius 3.89 arc min.
n_usno: 312 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.56692
RA DEC Mag Color
bright star 0: 244.95806 (16:19:49.93) -15.62373 (-15:37:25.4) 11.57 USNO-V
Mean distance difference (CAT_DELTA) for 12 matched entries is 0.621" for 1108208_g542
Mean and std. dev of mag. difference (MAG_DELTA) are 1.258 and 0.724 for 1108208_g542
Found 4 entries without IDs and 3 entries that are acceptable afterglow candidates for 1108208_g542.
Acceptable entries have no ID, XRT distances < 11.75", 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=244.9830 (16:19:55.92) DEC=-15.6560 (-15:39:21.6)
XRT distances are from RA=244.9768 (16:19:54.43) DEC=-15.6424 (-15:38:32.6)
*** WARNING 26 per cent of entries have no IDs.
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1108208_g542 with genie
ra=244.98093 (16:19:55.42) dec=-15.64506 (-15:38:42.2) +/- 0.6" mag=17.19+/-0.14
dist=17.2 REFID=11 major=2.9 minor=2.1 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 40.0 arc sec from the BAT position.
Found 2 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)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
244.9795 -15.6403 18.0 -1 USNO-B1 12.67 12.81 12.75
244.9790 -15.6424 11.8 -1 USNO-B1 99.99 19.29 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.9
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1108208_g542 with genie
ra=244.98392 (16:19:56.14) dec=-15.64275 (-15:38:33.9) +/- 0.6" mag=16.97+/-0.14
dist=24.7 REFID=10 major=3.7 minor=1.1 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 47.8 arc sec from the BAT position.
Found 4 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
244.9822 -15.6393 13.8 -1 USNO-B1 19.99 18.80 19.33
244.9826 -15.6395 12.6 -1 USNO-B1 20.05 19.37 19.67
244.9795 -15.6403 17.7 -1 USNO-B1 12.67 12.81 12.75
244.9790 -15.6424 17.2 -1 USNO-B1 99.99 19.29 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 3.7
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1108208_g542 with genie
ra=244.97375 (16:19:53.70) dec=-15.64828 (-15:38:53.8) +/- 0.6" mag=16.69+/-0.14
dist=23.6 REFID=8 major=8.0 minor=2.3 flag=2 (blended)
*** The position of this source is inconsistent with the XRT position.
The position is 42.4 arc sec from the BAT position.
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
244.9747 -15.6497 6.1 -1 USNO-B1 20.65 99.99 99.99
244.9722 -15.6532 18.4 -1 USNO-B1 99.99 19.40 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 8.0
Found 2 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
244.9763 -15.6401 8.5 -1 USNO-B1 20.31 19.17 19.68
244.9790 -15.6424 7.6 -1 USNO-B1 99.99 19.29 99.99
The closest star is 7.60" away.
List UVOT sources within 10" of the XRT position:
There are 97254.305 counts in the bkg source region of 5964.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 16.307 counts/pixel (5-sig UL in 4" is 19.83 mag) for 1108208_g542
There are 3553.8838 counts in the xrt source region of 196.00000 pixels.
Rate in xrt region with 8 arcsec radius is 18.132 counts/pixel for 1108208_g542
There are 15668.083 counts in the xrt_bkg source region of 990.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 15.826 counts/pixel (5-sig UL in 4" is 19.85 mag) for 1108208_g542
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 20.39, XRT distances < 11.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1108208_675383620_220527d22h39m42s530633usUT_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(244.9780,-15.6353,45")
fk5;-circle(244.979662831261,-15.6400242773845,6")
fk5;-circle(244.980930363269,-15.6450609864411,6")
fk5;-circle(244.98392306057,-15.6427521150313,6")
fk5;-circle(244.973748558409,-15.6482754345857,6")
Region file: 1108208_675383620_220527d22h39m42s530633usUT_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(244.9768,-15.6424,8")
Region file: 1108208_675383620_220527d22h39m42s530633usUT_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(244.9768,-15.6424,25")
fk5;-circle(244.9768,-15.6424,15")
fk5;-circle(244.979662831261,-15.6400242773845,6")
fk5;-circle(244.980930363269,-15.6450609864411,6")
fk5;-circle(244.98392306057,-15.6427521150313,6")
fk5;-circle(244.973748558409,-15.6482754345857,6")
image paragraph message for exposure 1 of trigger 1108208
------ Start for Possible Stand-alone Circular ----
In response to GRB220527 (Swift/BAT trigger 1108208) at 22:24:37 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 512 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
0.344.
------- notes for trigger 1108208 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 220527d22h39m44s307097usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1108208
-expid=675383620 -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/1108208/
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 675383620.00344 or about 2022:147:22:33:35 UT
Found 751 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 14% of the srclist region. Found 94 sources in
srclist catalog. Found 22 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 15 source(s) in Genie image catalog. Found 4 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.39 mag. Found 308 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
14% of the Genie image region.
Genie image analysis:
Found 97254.3 counts in the large background region of 5964.0 pixels or a rate
of 16.307 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 19.66 mag. for a
4-arcsec aperture.
Found 3553.9 counts in the XRT position region of 196.0 pixels or a rate of
18.132 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 3.013 +/- 0.430 (1-sigma) cps or
18.41 mag and a range from 18.26 to 18.57 mag. The 3-sigma UL at the XRT
position is 4.304 cps or 18.02 mag.
Found 2 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 244.9754 dec= -15.6416 mag=19.62 sep=5.59".
The closest srclist source has ra= 244.9754 dec= -15.6416 mag=19.62 sep=5.59".
The closest Genie source has ra= 244.9797 dec= -15.6400 mag=13.71 sep=13.10".
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 512 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 16:19:54.11 = 244.97545
DEC(J2000) = -15:38:29.6 = -15.64155
with a 90%-confidence error radius of about 1.10 arc sec. This position is 5.59
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.62 with a 1-sigma error of about 0.35. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.344.
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?
675383620 512 WHITE srclist found no candidates.
675383620 512 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -15.64240
GRB_ERROR: 11.75
GRB_RA: 244.97680
IMAGE_START_TIME: 22:33:35
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT