image overlap message for exposure 2 of trigger 1262764
uvot_overlap.pl vrs. 2010-12-20b fem started at 241027d07h25m47s835898usUT
The observation of trigger 1262764 started 2024-10-26T22:48:37.2
Examining file ./1262764_g364_uvot_sky_image.fits
The exposure ID is 751675717
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (293.4130,57.9774) with a roll angle of 256.2
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 (293.4230,57.9800) with a radius of 3.000 arc min
This is 0.356 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 (293.4006,57.9861) with a radius of 0.037 arc min
This is 0.655 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 2 of trigger 1262764
find_uvot_ag.pl vrs. 2023-04-25a fem started at 241027d07h26m07s790519usUT
Observation start time is 2024-10-26T22:48:37.2
Examining file ./1262764_g364_uvot_catalog_image.fits
The exposure ID is 751675717
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 17 detected source(s) for 1262764_g364
Aspect correction adds -0.00159 degrees (-0.381 sec of time = -3.03 arc sec) to RA
Aspect correction adds 0.00009 degrees ( 0.34 arcsec) to Dec
Total aspect correction is 3.05 arcsec
Star catalogs centered at 293.4189 , 57.9724 with radius 2.54 arc min.
n_usno: 187 n_gsc: 253
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 18 matched entries is 0.379" for 1262764_g364
Mean and std. dev of mag. difference (MAG_DELTA) are 0.691 and 0.457 for 1262764_g364
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1262764_g364.
Acceptable entries have no ID, XRT distances < 5.5", 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=293.4230 (19:33:41.52) DEC=57.9800 (+57:58:48.0)
XRT distances are from RA=293.4006 (19:33:36.14) DEC=57.9861 (+57:59:10.0)
Found 4 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
293.4040 57.9858 6.6 -1 USNO-B1 21.54 19.97 20.67
293.4037 57.9858 6.0 -1 USNO-B1 21.08 99.99 99.99
293.4041 57.9857 6.9 -1 GSC2.3 19.63 99.99 99.99
293.4042 57.9858 7.0 -1 GSC2.3 19.26 21.41 99.99
The closest star is 6.00" away.
List UVOT sources within 10" of the XRT position:
There are 18357.242 counts in the bkg source region of 5594.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.282 counts/pixel (5-sig UL in 4" is 19.82 mag) for 1262764_g364
There are 632.11694 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.145 counts/pixel for 1262764_g364
There are 2966.3867 counts in the xrt_bkg source region of 975.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 3.042 counts/pixel (5-sig UL in 4" is 19.86 mag) for 1262764_g364
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 20.37, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1262764_751675717_241027d07h26m07s790519usUT_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(293.4130,57.9774,45")
fk5;-circle(293.422791058989,57.9781595880796,6")
fk5;-circle(293.415563497872,57.9804455178313,6")
fk5;-circle(293.433061806535,57.9773646365209,6")
fk5;-circle(293.411015165873,57.9843060026958,6")
fk5;-circle(293.423786391352,57.966484943069,6")
fk5;-circle(293.401202394674,57.973461222675,6")
fk5;-circle(293.420047414891,57.9642847116389,6")
fk5;-circle(293.393215721324,57.9827793962728,6")
Region file: 1262764_751675717_241027d07h26m07s790519usUT_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(293.40058,57.98611,8")
Region file: 1262764_751675717_241027d07h26m07s790519usUT_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(293.40058,57.98611,25")
fk5;-circle(293.40058,57.98611,15")
fk5;-circle(293.411015165873,57.9843060026958,6")
fk5;-circle(293.393215721324,57.9827793962728,6")
fk5;-circle(293.388674404706,57.9845144364834,6")
fk5;-circle(293.385779883517,57.9884286270614,6")
image paragraph message for exposure 2 of trigger 1262764
SRCLIST PROBLEM: srclist filled telemetry buffer
------ Start for Possible Stand-alone Circular ----
In response to GRB241026 (Swift/BAT trigger 1262764) at 22:42:32 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
330 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
0.073.
------- notes for trigger 1262764 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 241027d07h26m15s316105usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1262764
-expid=751675717 -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/1262764/
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 751675717.24848 or about 2024:300:22:48:32 UT
Found 2749 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 26% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 41 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 17 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 20.37 mag. Found 253 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
27% of the Genie image region.
Genie image analysis:
Found 18357.2 counts in the large background region of 5594.0 pixels or a rate
of 3.282 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 19.62 mag. for a
4-arcsec aperture.
Found 632.1 counts in the XRT position region of 201.0 pixels or a rate of
3.145 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.082 +/- 0.110 (1-sigma) cps or
20.86 mag and a range from 19.93 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.413 cps or 19.10 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.52 mag. The closest
srclist source has ra= 293.3886 dec= 57.9843 mag=17.50 sep=23.67". The closest
Genie source has ra= 293.3932 dec= 57.9828 mag=18.91 sep=18.48".
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?
751675717 330 U srclist found no candidates.
751675717 330 U image found no candidates.
List afterglow candidates for other finding charts.
751675504 117 WHITE srclist found no candidates.
751675504 117 WHITE image found no candidates.
751676251 864 WHITE srclist found no candidates.
751676251 864 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 57.98611
GRB_ERROR: 5.5
GRB_RA: 293.40058
IMAGE_START_TIME: 22:48:32
MAGNITUDE: 19.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT