image overlap message for exposure 2 of trigger 1107466
uvot_overlap.pl vrs. 2010-12-20b fem started at 220522d07h41m56s943050usUT
The observation of trigger 1107466 started 2022-05-21T23:26:03.0
Examining file ./1107466_g340_uvot_sky_image.fits
The exposure ID is 674868362
The exposure time is 235.991 (seconds)
The filter is U.
*** Warning -- found 9284 null pixels in the image.
The uvot region is centered at (275.2004,10.3889) with a roll angle of 49.4
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 (275.1970,10.3840) with a radius of 3.000 arc min
This is 0.353 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 (275.2299,10.3718) with a radius of 0.035 arc min
This is 2.023 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 0.000 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1107466
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220522d07h42m13s494526usUT
Observation start time is 2022-05-21T23:26:03.0
Examining file ./1107466_g340_uvot_catalog_image.fits
The exposure ID is 674868362
The exposure is 235.991 sec.
The bin size is 2 pixels
The filter is U
There are 21 detected source(s) for 1107466_g340
Aspect correction adds 0.00162 degrees (0.389 sec of time = 5.74 arc sec) to RA
Aspect correction adds 0.00016 degrees ( 0.57 arcsec) to Dec
Total aspect correction is 5.77 arcsec
Star catalogs centered at 275.1986 , 10.3886 with radius 2.82 arc min.
n_usno: 413 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 20 matched entries is 0.545" for 1107466_g340
Mean and std. dev of mag. difference (MAG_DELTA) are 0.991 and 0.568 for 1107466_g340
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1107466_g340.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=275.1970 (18:20:47.28) DEC=10.3840 (+10:23:02.4)
XRT distances are from RA=275.2299 (18:20:55.18) DEC=10.3718 (+10:22:18.3)
-----------------
Entry 15 in the list of sources is a candidate afterglow for 1107466_g340 with genie
ra=275.21348 (18:20:51.23) dec=10.39983 (+10:23:59.4) +/- 0.7" mag=18.24+/-0.17
dist=116.7 REFID=7 major=1.2 minor=1.1 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 81.6 arc sec from the BAT position.
Found 9 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
275.2128 10.3951 17.3 -1 USNO-B1 20.06 18.68 19.29
275.2138 10.3969 10.7 -1 USNO-B1 18.52 17.29 17.83
275.2112 10.4005 8.3 -1 USNO-B1 19.69 17.54 18.49
275.2145 10.3966 12.4 -1 USNO-B1 19.36 18.08 18.65
275.2135 10.3997 0.4 -1 USNO-B1 18.10 16.70 17.32 *
275.2143 10.4002 3.2 -1 USNO-B1 18.52 17.44 17.92 *
275.2125 10.4032 12.5 -1 USNO-B1 19.88 18.43 19.08
275.2181 10.3969 19.5 -1 USNO-B1 16.31 15.29 15.75
275.2168 10.4043 19.9 -1 USNO-B1 18.22 16.83 17.45
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are 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:
There are 26177.854 counts in the bkg source region of 4296.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 6.094 counts/pixel (5-sig UL in 4" is 19.42 mag) for 1107466_g340
Do not compute counts in XRT region because position is too far from center.
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 19.98, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1107466_674868362_220522d07h42m13s494526usUT_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(275.2004,10.3889,45")
fk5;-circle(275.196170567047,10.3879992549169,6")
fk5;-circle(275.201150200116,10.3870163741034,6")
fk5;-circle(275.190780849579,10.3829170861171,6")
fk5;-circle(275.188545975793,10.3831062110689,6")
fk5;-circle(275.202669386317,10.3909395367516,6")
fk5;-circle(275.187213318074,10.3851629433848,6")
fk5;-circle(275.207166647755,10.3858619467252,6")
fk5;-circle(275.19079608617,10.3960947317341,6")
fk5;-circle(275.192714405163,10.398552849874,6")
fk5;-circle(275.196266328066,10.4004457790283,6")
image paragraph message for exposure 2 of trigger 1107466
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no overlap
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB220521 (Swift/BAT trigger 1107466) at 23:20:21 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 236 seconds with the U filter starting
312 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 none of the
XRT error circle. 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 18.0 mag. No correction has been made for the expected extinction
corresponding to E(B-V) of 0.185.
------- notes for trigger 1107466 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 220522d07h42m16s923567usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1107466
-expid=674868362 -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/1107466/
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 674868362.99734 or about 2022:141:23:25:57 UT
Found 3748 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 33% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 13 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.09 mag.
Found 21 source(s) in Genie image catalog. Found 1 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.98 mag. Found 409 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
35% of the Genie image region. The Genie image is INCOMPLETE with 9284 null
pixels.
Genie image analysis:
Found 26177.9 counts in the large background region of 4296.0 pixels or a rate
of 6.094 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 19.26 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 18.21 mag. The closest srclist
source has ra= 275.2313 dec= 10.3630 mag=17.31 sep=31.70". The closest Genie
source has ra= 275.2166 dec= 10.3904 mag=19.63 sep=82.09".
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?
674868362 311 U srclist found no candidates.
674868362 311 U image found no candidates.
List afterglow candidates for other finding charts.
674868150 99 WHITE srclist found no candidates.
674868150 99 WHITE image found no candidates.
------- Tokens for Quick GCN -------