image overlap message for exposure 2 of trigger 1222885
uvot_overlap.pl vrs. 2010-12-20b fem started at 240419d00h17m46s659332usUT
The observation of trigger 1222885 started 2024-04-18T20:29:25.0
Examining file ./1222885_g316_uvot_sky_image.fits
The exposure ID is 735164965
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (239.3261,23.6124) with a roll angle of 45.5
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 (239.3220,23.6070) with a radius of 3.000 arc min
This is 0.395 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 (239.3753,23.5958) with a radius of 0.060 arc min
This is 2.881 arc min from the center of the uvot region
The area of the XRT error circle is 0.011 sq. arc min
The UVOT/XRT overlap is 0.000 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1222885
find_uvot_ag.pl vrs. 2023-04-25a fem started at 240419d00h17m55s512500usUT
Observation start time is 2024-04-18T20:29:25.0
Examining file ./1222885_g316_uvot_catalog_image.fits
The exposure ID is 735164965
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 3 detected source(s) for 1222885_g316
Aspect correction adds 0.00183 degrees (0.438 sec of time = 6.02 arc sec) to RA
Aspect correction adds 0.00093 degrees ( 3.34 arcsec) to Dec
Total aspect correction is 6.89 arcsec
Star catalogs centered at 239.3211 , 23.6083 with radius 2.44 arc min.
n_usno: 44 n_gsc: 39
*** WARNING -- XRT position is outside star catalog search region.
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 3 matched entries is 0.308" for 1222885_g316
Mean and std. dev of mag. difference (MAG_DELTA) are 1.178 and 0.320 for 1222885_g316
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1222885_g316.
Acceptable entries have no ID, XRT distances < 9", 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=239.3220 (15:57:17.28) DEC=23.6070 (+23:36:25.2)
XRT distances are from RA=239.3753 (15:57:30.07) DEC=23.5958 (+23:35:45.0)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 48910.449 counts in the bkg source region of 6320.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.739 counts/pixel (5-sig UL in 4" is 19.35 mag) for 1222885_g316
Do not compute counts in XRT region because position is too far from center.
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 19.91, XRT distances < 9",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1222885_735164965_240419d00h17m55s512500usUT_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(239.3261,23.6124,45")
image paragraph message for exposure 2 of trigger 1222885
IMAGE PROBLEM: no overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB240418 (Swift/BAT trigger 1222885) at 20:24:08 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
283 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 none of the
XRT error circle. 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 0.057.
------- notes for trigger 1222885 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 240419d00h17m59s039108usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1222885
-expid=735164965 -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/1222885/
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 735164965.0449 or about 2024:109:20:29:20 UT
Found 612 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 47 sources in
srclist catalog. Found 5 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 3 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 19.91 mag. Found 40 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 4% of the
Genie image region. The XRT position was OUTSIDE the star catalog search
region.
Genie image analysis:
Found 48910.4 counts in the large background region of 6320.0 pixels or a rate
of 7.739 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 19.16 mag. for a
4-arcsec aperture. The closest srclist source has ra= 239.3619 dec= 23.5905
mag=15.87 sep=48.09". The closest Genie source has ra= 239.3417 dec= 23.5935
mag=17.93 sep=111.15".
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?
735164965 283 U srclist found no candidates.
735164965 283 U image found no candidates.
List afterglow candidates for other finding charts.
735164807 125 WHITE srclist found no candidates.
735164807 125 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 23.59583
GRB_ERROR: 9
GRB_RA: 239.37529
IMAGE_START_TIME: 20:29:20
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT