image overlap message for exposure 2 of trigger 1223470
uvot_overlap.pl vrs. 2010-12-20b fem started at 240421d18h35m40s144951usUT
The observation of trigger 1223470 started 2024-04-21T09:49:10.0
Examining file ./1223470_g374_uvot_sky_image.fits
The exposure ID is 735385749
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (299.6914,-14.8766) with a roll angle of 78.3
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 (299.6860,-14.8790) with a radius of 3.000 arc min
This is 0.345 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 (299.7008,-14.8596) with a radius of 0.035 arc min
This is 1.156 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 1223470
find_uvot_ag.pl vrs. 2023-04-25a fem started at 240421d18h35m58s567915usUT
Observation start time is 2024-04-21T09:49:10.0
Examining file ./1223470_g374_uvot_catalog_image.fits
The exposure ID is 735385749
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 22 detected source(s) for 1223470_g374
Aspect correction adds 0.00202 degrees (0.486 sec of time = 7.04 arc sec) to RA
Aspect correction adds 0.00023 degrees ( 0.82 arcsec) to Dec
Total aspect correction is 7.09 arcsec
Star catalogs centered at 299.6916 , -14.8779 with radius 2.81 arc min.
n_usno: 189 n_gsc: 226
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.65852
RA DEC Mag Color
bright star 0: 299.66551 (19:58:39.72) -14.90965 (-14:54:34.8) 10.66 USNO-V
Mean distance difference (CAT_DELTA) for 22 matched entries is 0.445" for 1223470_g374
Mean and std. dev of mag. difference (MAG_DELTA) are 1.310 and 0.348 for 1223470_g374
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1223470_g374.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=299.6860 (19:58:44.64) DEC=-14.8790 (-14:52:44.4)
XRT distances are from RA=299.7008 (19:58:48.20) DEC=-14.8596 (-14:51:34.6)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 21393.488 counts in the bkg source region of 5669.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.774 counts/pixel (5-sig UL in 4" is 19.74 mag) for 1223470_g374
There are 740.78510 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.741 counts/pixel for 1223470_g374
XRT source is too far (69.408482122656") 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 20.30, 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: 1223470_735385749_240421d18h35m58s567915usUT_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(299.6914,-14.8766,45")
fk5;-circle(299.687804353708,-14.881059970509,6")
fk5;-circle(299.682582573944,-14.8759840550034,6")
fk5;-circle(299.688905538299,-14.8720778171247,6")
fk5;-circle(299.698313046476,-14.8850338853828,6")
fk5;-circle(299.69978052923,-14.8745396423006,6")
fk5;-circle(299.699440191573,-14.872627262917,6")
Region file: 1223470_735385749_240421d18h35m58s567915usUT_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(299.70083,-14.85961,8")
image paragraph message for exposure 2 of trigger 1223470
SRCLIST PROBLEM: srclist filled telemetry buffer
------ Start for Possible Stand-alone Circular ----
In response to GRB240421 (Swift/BAT trigger 1223470) at 09:42:54 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
342 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
coverage of the XRT error circle by the 8'x8' region for the list of sources
generated on-board is uncertain because the large number of sources filled the
available telemetry. 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 0.183.
------- notes for trigger 1223470 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 240421d18h36m02s356852usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1223470
-expid=735385749 -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/1223470/
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 735385749.95796 or about 2024:112:09:49:04 UT
Found 2299 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 19% of the srclist region. Found 183 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 25 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 22 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 20.30 mag. Found 226 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
19% of the Genie image region.
Genie image analysis:
Found 21393.5 counts in the large background region of 5669.0 pixels or a rate
of 3.774 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 19.55 mag. for a
4-arcsec aperture.
Found 740.8 counts in the XRT position region of 198.0 pixels or a rate of
3.741 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.026 +/- 0.111 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.332 cps or 19.35 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 18.71
mag. The closest srclist source has ra= 299.6969 dec= -14.8563 mag=18.41
sep=18.19". The closest Genie source has ra= 299.6968 dec= -14.8559 mag=18.95
sep=19.28".
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?
735385749 341 U srclist found no candidates.
735385749 341 U image found no candidates.
List afterglow candidates for other finding charts.
735385536 128 WHITE srclist found no candidates.
735385536 128 WHITE image found no candidates.
735386279 871 WHITE srclist found no candidates.
735386279 871 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -14.85961
GRB_ERROR: 5.25
GRB_RA: 299.70083
IMAGE_START_TIME: 09:49:04
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT