image overlap message for exposure 1 of trigger 1156572
uvot_overlap.pl vrs. 2010-12-20b fem started at 230228d17h11m07s475646usUT
The observation of trigger 1156572 started 2023-02-28T05:53:23.0
Examining file ./1156572_g699256402_uvot_sky_image.fits
The exposure ID is 699256402
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (18.4000,44.4822) with a roll angle of 222.8
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 (18.4030,44.4890) with a radius of 3.000 arc min
This is 0.430 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 (18.3781,44.4829) with a radius of 0.035 arc min
This is 0.938 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 1156572
find_uvot_ag.pl vrs. 2020-10-30 fem started at 230228d17h11m10s390786usUT
Observation start time is 2023-02-28T05:56:56.2
Examining file ./1156572_g365_uvot_catalog_image.fits
The exposure ID is 699256616
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 8 detected source(s) for 1156572_g365
Aspect correction adds -0.00052 degrees (-0.124 sec of time = -1.33 arc sec) to RA
Aspect correction adds -0.00096 degrees (-3.44 arcsec) to Dec
Total aspect correction is 3.69 arcsec
Star catalogs centered at 18.4004 , 44.4866 with radius 2.35 arc min.
n_usno: 63 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 8 matched entries is 0.363" for 1156572_g365
Mean and std. dev of mag. difference (MAG_DELTA) are 0.419 and 0.583 for 1156572_g365
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1156572_g365.
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=18.4030 (01:13:36.72) DEC=44.4890 (+44:29:20.4)
XRT distances are from RA=18.3781 (01:13:30.75) DEC=44.4829 (+44:28:58.5)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 27631.682 counts in the bkg source region of 5752.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.804 counts/pixel (5-sig UL in 4" is 19.61 mag) for 1156572_g365
There are 955.78210 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 4.803 counts/pixel for 1156572_g365
XRT source is too far (58.2352902643087") from center -- do not compute local background.
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 20.17, 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: 1156572_699256616_230228d17h11m10s390786usUT_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(18.4008,44.4832,45")
fk5;-circle(18.4015173499013,44.4940519492073,6")
fk5;-circle(18.3959241872722,44.4938450297248,6")
fk5;-circle(18.4134076044334,44.4856143082385,6")
fk5;-circle(18.4040103818365,44.4778039177024,6")
fk5;-circle(18.4069817541695,44.4732885265053,6")
Region file: 1156572_699256616_230228d17h11m10s390786usUT_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(18.37813,44.48292,8")
image paragraph message for exposure 1 of trigger 1156572
SRCLIST PROBLEM: srclist filled telemetry buffer
------ Start for Possible Stand-alone Circular ----
In response to GRB230228 (Swift/BAT trigger 1156572) at 05:50:50 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
335 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 19.2 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 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.085.
------- notes for trigger 1156572 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 230228d17h11m14s962394usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1156572
-expid=699256616 -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/1156572/
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 699256616.20048 or about 2023:059:05:56:51 UT
Found 1336 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 11% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 76 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.12 mag.
Found 8 source(s) in Genie image catalog. 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 20.17 mag. Found 59 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 7% of the
Genie image region.
Genie image analysis:
Found 27631.7 counts in the large background region of 5752.0 pixels or a rate
of 4.804 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 19.44 mag. for a
4-arcsec aperture.
Found 955.8 counts in the XRT position region of 199.0 pixels or a rate of
4.803 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.001 +/- 0.126 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.377 cps or 19.22 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 18.47
mag. The closest srclist source has ra= 18.3753 dec= 44.4755 mag=17.89
sep=27.81". The closest Genie source has ra= 18.3819 dec= 44.4757 mag=14.81
sep=27.91".
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?
699256616 ???? U srclist found no candidates.
699256616 ???? U image found no candidates.
List afterglow candidates for other finding charts.
699256402 ???? WHITE srclist found no candidates.
699256402 ???? WHITE image found no candidates.
699257146 ???? WHITE srclist found no candidates.
699257146 ???? WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 44.48292
GRB_ERROR: 5.25
GRB_RA: 18.37813
IMAGE_START_TIME: 05:56:51
MAGNITUDE: 19.2
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT