image overlap message for exposure 1 of trigger 1223470
uvot_overlap.pl vrs. 2010-12-20b fem started at 240421d18h35m39s261197usUT
The observation of trigger 1223470 started 2024-04-21T09:45:37.0
Examining file ./1223470_g161_uvot_sky_image.fits
The exposure ID is 735385536
The exposure time is 149.868 (seconds)
The filter is WHITE.
*** Warning -- found 4516 null pixels in the image.
The uvot region is centered at (299.6928,-14.8756) 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 0.447 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 1.063 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 1223470
find_uvot_ag.pl vrs. 2023-04-25a fem started at 240421d18h35m44s135917usUT
Observation start time is 2024-04-21T09:45:37.0
Examining file ./1223470_g161_uvot_catalog_image.fits
The exposure ID is 735385536
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 18 detected source(s) for 1223470_g161
Aspect correction adds 0.00196 degrees (0.470 sec of time = 6.81 arc sec) to RA
Aspect correction adds 0.00029 degrees ( 1.06 arcsec) to Dec
Total aspect correction is 6.89 arcsec
Star catalogs centered at 299.6923 , -14.8769 with radius 2.73 arc min.
n_usno: 184 n_gsc: 212
*** 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 18 matched entries is 0.282" for 1223470_g161
Mean and std. dev of mag. difference (MAG_DELTA) are 1.202 and 0.300 for 1223470_g161
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1223470_g161.
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 77454.758 counts in the bkg source region of 5450.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 14.212 counts/pixel (5-sig UL in 4" is 19.91 mag) for 1223470_g161
There are 2840.1621 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 14.272 counts/pixel for 1223470_g161
XRT source is too far (63.986021182149") 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 20.46, 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_735385536_240421d18h35m44s135917usUT_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(299.6928,-14.8756,45")
fk5;-circle(299.687870741545,-14.8810572786336,6")
fk5;-circle(299.682403295631,-14.8758907617535,6")
fk5;-circle(299.688940177344,-14.8720972039261,6")
fk5;-circle(299.69614842676,-14.8802675136737,6")
fk5;-circle(299.695442435697,-14.8864721135533,6")
fk5;-circle(299.698310348664,-14.8851223012469,6")
fk5;-circle(299.699835392579,-14.8746362374305,6")
fk5;-circle(299.699456577249,-14.8724880819047,6")
fk5;-circle(299.686186858691,-14.8629877079517,6")
Region file: 1223470_735385536_240421d18h35m44s135917usUT_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 1 of trigger 1223470
------ 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 150 seconds with the White filter
starting 129 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
0.183.
------- notes for trigger 1223470 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 240421d18h35m48s289829usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1223470
-expid=735385536 -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 735385536.96746 or about 2024:112:09:45:31 UT
Found 1127 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 19% of the srclist region. Found 157 sources in
srclist catalog. Found 24 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 18 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 20.46 mag. Found 212 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
19% of the Genie image region. The Genie image is INCOMPLETE with 4516 null
pixels.
Genie image analysis:
Found 77454.8 counts in the large background region of 5450.0 pixels or a rate
of 14.212 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 19.73 mag. for a
4-arcsec aperture.
Found 2840.2 counts in the XRT position region of 199.0 pixels or a rate of
14.272 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is 0.080 +/- 0.362 (1-sigma) cps or
22.34 mag and a range from 20.49 to 99.99 mag. The 3-sigma UL at the XRT
position is 1.165 cps or 19.44 mag. The closest srclist source has ra= 299.6963
dec= -14.8561 mag=19.09 sep=20.07". The closest Genie source has ra= 299.6968
dec= -14.8559 mag=18.76 sep=19.42".
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?
735385536 128 WHITE srclist found no candidates.
735385536 128 WHITE image found no candidates.
List afterglow candidates for other finding charts.
735385749 341 U srclist found no candidates.
735385749 341 U 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: white
GRB_DEC: -14.85961
GRB_ERROR: 5.25
GRB_RA: 299.70083
IMAGE_START_TIME: 09:45:31
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT