image overlap message for exposure 3 of trigger 1165948
uvot_overlap.pl vrs. 2010-12-20b fem started at 230427d13h47m57s460232usUT
The observation of trigger 1165948 started 2023-04-27T10:46:43.3
Examining file ./1165948_g891_uvot_sky_image.fits
The exposure ID is 704285203
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (153.3165,48.1810) with a roll angle of 300.8
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 (153.3240,48.1800) with a radius of 3.000 arc min
This is 0.306 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 (153.3132,48.2039) with a radius of 0.040 arc min
This is 1.381 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 3 of trigger 1165948
find_uvot_ag.pl vrs. 2023-04-25a fem started at 230427d13h48m15s040785usUT
Observation start time is 2023-04-27T10:46:43.3
Examining file ./1165948_g891_uvot_catalog_image.fits
The exposure ID is 704285203
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 6 detected source(s) for 1165948_g891
Aspect correction adds -0.00027 degrees (-0.066 sec of time = -0.66 arc sec) to RA
Aspect correction adds 0.00005 degrees ( 0.17 arcsec) to Dec
Total aspect correction is 0.68 arcsec
Star catalogs centered at 153.3152 , 48.1801 with radius 2.38 arc min.
n_usno: 35 n_gsc: 24
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 8 matched entries is 0.734" for 1165948_g891
Mean and std. dev of mag. difference (MAG_DELTA) are 0.809 and 0.646 for 1165948_g891
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1165948_g891.
Acceptable entries have no ID, XRT distances < 6", 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=153.3240 (10:13:17.76) DEC=48.1800 (+48:10:48.0)
XRT distances are from RA=153.3132 (10:13:15.16) DEC=48.2039 (+48:12:14.2)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 45886.203 counts in the bkg source region of 6272.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.316 counts/pixel (5-sig UL in 4" is 20.27 mag) for 1165948_g891
There are 1056.2356 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 5.308 counts/pixel for 1165948_g891
XRT source is too far (82.9699389530775") 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 20.82, XRT distances < 6",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1165948_704285203_230427d13h48m15s040785usUT_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(153.3165,48.1810,45")
fk5;-circle(153.30038658001,48.1736850510062,6")
Region file: 1165948_704285203_230427d13h48m15s040785usUT_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(153.31317,48.20394,8")
image paragraph message for exposure 3 of trigger 1165948
------ Start for Possible Stand-alone Circular ----
In response to GRB230427 (Swift/BAT trigger 1165948) at 10:31:51 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 860 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
0.007.
------- notes for trigger 1165948 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 230427d13h48m18s695723usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1165948
-expid=704285203 -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/1165948/
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 704285203.29234 or about 2023:117:10:46:38 UT
Found 373 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 52 sources in
srclist catalog. Found 20 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 6 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 20.82 mag. Found 31 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 3% of the
Genie image region.
Genie image analysis:
Found 45886.2 counts in the large background region of 6272.0 pixels or a rate
of 7.316 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 20.09 mag. for a
4-arcsec aperture.
Found 1056.2 counts in the XRT position region of 199.0 pixels or a rate of
5.308 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -2.665 +/- 0.221 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.664 cps or 20.05 mag. The closest srclist
source has ra= 153.3321 dec= 48.2002 mag=17.48 sep=47.27". The closest Genie
source has ra= 153.3169 dec= 48.1995 mag=19.15 sep=18.34".
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?
704285203 859 WHITE srclist found no candidates.
704285203 859 WHITE image found no candidates.
List afterglow candidates for other finding charts.
704284441 97 WHITE srclist found no candidates.
704284441 97 WHITE 153.31270 48.20400 20.31/20.8 1.2 image Yes
704284599 255 U srclist found no candidates.
704284599 255 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 48.20394
GRB_ERROR: 6
GRB_RA: 153.31317
IMAGE_START_TIME: 10:46:38
MAGNITUDE: 20.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT