image overlap message for exposure 1 of trigger 1165948
uvot_overlap.pl vrs. 2010-12-20b fem started at 230427d13h47m56s393659usUT
The observation of trigger 1165948 started 2023-04-27T10:34:01.7
Examining file ./1165948_g129_uvot_sky_image.fits
The exposure ID is 704284441
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (153.3148,48.1814) 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 0.377 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 1.353 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 1 of trigger 1165948
find_uvot_ag.pl vrs. 2023-04-25a fem started at 230427d13h47m59s167989usUT
Observation start time is 2023-04-27T10:34:01.7
Examining file ./1165948_g129_uvot_catalog_image.fits
The exposure ID is 704284441
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 6 detected source(s) for 1165948_g129
Aspect correction adds 0.00025 degrees (0.061 sec of time = 0.61 arc sec) to RA
Aspect correction adds 0.00006 degrees ( 0.21 arcsec) to Dec
Total aspect correction is 0.64 arcsec
Star catalogs centered at 153.3153 , 48.1820 with radius 2.33 arc min.
n_usno: 34 n_gsc: 24
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.494" for 1165948_g129
Mean and std. dev of mag. difference (MAG_DELTA) are 0.877 and 0.503 for 1165948_g129
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1165948_g129.
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)
-----------------
Entry 6 in the list of sources is a candidate afterglow for 1165948_g129 with genie
ra=153.31270 (10:13:15.05) dec=48.20400 (+48:12:14.4) +/- 0.7" mag=20.31+/-0.20
dist=1.2 REFID=2 major=1.0 minor=0.8 flag=0
This source is near the edge of image (0.895)
Found 4 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
153.3167 48.1996 18.7 -1 USNO-B1 18.93 18.71 18.81
153.3166 48.1998 17.8 -1 USNO-B1 19.09 17.97 18.47
153.3160 48.2006 14.6 -1 USNO-B1 20.37 99.99 99.99
153.3167 48.1996 18.4 -1 GSC2.3 17.98 19.43 18.63
uvot_check_outside found 12 of 12 good pixels
##### This source remains a candidate #####
It has no entries within 5.25" 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:
Unmatched source ra=153.31270 (10:13:15.05) dec=48.20400 (+48:12:14.4) +/- 0.7" mag=20.31+/-0.20 dist=1.2 REFID=2 flag=0
There are 46847.707 counts in the bkg source region of 6245.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.502 counts/pixel (5-sig UL in 4" is 20.26 mag) for 1165948_g129
There are 476.61148 counts in the src source region of 48.000000 pixels.
Rate in src region with 4 arcsec radius is 9.929 counts/pixel for 1165948_g129
source too far 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 20.81, XRT distances < 6",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1165948_704284441_230427d13h47m59s167989usUT_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(153.3148,48.1814,45")
fk5;-circle(153.3005237166,48.173650555467,6")
Region file: 1165948_704284441_230427d13h47m59s167989usUT_cand_src.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(153.312698966798,48.2040039512776,4")
image paragraph message for exposure 1 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 98 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 10:13:15.05 = 153.31270
DEC(J2000) = +48:12:14.4 = 48.20400
with a 90%-confidence error radius of about 0.74 arc sec. This position is 1.2
arc sec. from the center of the XRT error circle. The estimated magnitude is
20.31 with a 1-sigma error of about 0.20. 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 230427d13h48m03s494345usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1165948
-expid=704284441 -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 704284441.65686 or about 2023:117:10:33:56 UT
Found 138 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 25 sources in
srclist catalog. 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 6 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.81 mag. Found 30 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 3% of the Genie image region. The
closest srclist source has ra= 153.3320 dec= 48.2003 mag=17.31 sep=46.95".
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?
704284441 97 WHITE srclist found no candidates.
704284441 97 WHITE 153.31270 48.20400 20.31/20.8 1.2 image Yes
List afterglow candidates for other finding charts.
704284599 255 U srclist found no candidates.
704284599 255 U image found no candidates.
704285203 859 WHITE srclist found no candidates.
704285203 859 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 48.20400
GRB_ERROR: 0.74
GRB_RA: 153.31270
IMAGE_START_TIME: 10:33:56
MAGNITUDE: 20.31
MAG_ERROR: 0.20
MESSAGE_TYPE: ACK
SOURCE: XRT