image overlap message for exposure 2 of trigger 1222955
uvot_overlap.pl vrs. 2010-12-20b fem started at 240419d08h17m33s811803usUT
The observation of trigger 1222955 started 2024-04-19T01:53:05.9
Examining file ./1222955_g303_uvot_sky_image.fits
The exposure ID is 735184385
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (94.5591,-45.0102) with a roll angle of 294.3
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 (94.5680,-45.0110) with a radius of 3.000 arc min
This is 0.381 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 (94.5340,-44.9995) with a radius of 0.037 arc min
This is 1.241 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 1222955
find_uvot_ag.pl vrs. 2023-04-25a fem started at 240419d08h17m44s007871usUT
Observation start time is 2024-04-19T01:53:05.9
Examining file ./1222955_g303_uvot_catalog_image.fits
The exposure ID is 735184385
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 9 detected source(s) for 1222955_g303
Aspect correction adds -0.00259 degrees (-0.621 sec of time = -6.59 arc sec) to RA
Aspect correction adds 0.00097 degrees ( 3.49 arcsec) to Dec
Total aspect correction is 7.45 arcsec
Star catalogs centered at 94.5589 , -45.0092 with radius 2.64 arc min.
n_usno: 79 n_gsc: 84
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 10 matched entries is 0.405" for 1222955_g303
Mean and std. dev of mag. difference (MAG_DELTA) are 0.600 and 0.746 for 1222955_g303
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1222955_g303.
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=94.5680 (06:18:16.32) DEC=-45.0110 (-45:00:39.6)
XRT distances are from RA=94.5340 (06:18:08.17) DEC=-44.9995 (-44:59:58.3)
Found 2 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
94.5337 -44.9975 7.4 -1 USNO-B1 21.03 19.77 20.33
94.5336 -44.9974 7.9 -1 GSC2.3 19.49 21.52 99.99
The closest star is 7.36" away.
List UVOT sources within 10" of the XRT position:
There are 11960.692 counts in the bkg source region of 5922.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.020 counts/pixel (5-sig UL in 4" is 20.08 mag) for 1222955_g303
There are 380.81512 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 1.914 counts/pixel for 1222955_g303
XRT source is too far (74.4546583519331") 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 20.64, 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: 1222955_735184385_240419d08h17m44s007871usUT_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(94.5591,-45.0102,45")
fk5;-circle(94.5724998809693,-45.0124276945556,6")
fk5;-circle(94.5626686056526,-45.0026506252411,6")
fk5;-circle(94.5548824387336,-45.0035725409435,6")
fk5;-circle(94.5505968944816,-44.999097620016,6")
Region file: 1222955_735184385_240419d08h17m44s007871usUT_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(94.53404,-44.99953,8")
image paragraph message for exposure 2 of trigger 1222955
------ Start for Possible Stand-alone Circular ----
In response to GRB240419 (Swift/BAT trigger 1222955) at 01:48:01 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
271 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
0.070.
------- notes for trigger 1222955 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 240419d08h17m47s546515usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1222955
-expid=735184385 -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/1222955/
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 735184385.9262 or about 2024:110:01:53:00 UT
Found 1007 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 144 sources in
srclist catalog. Found 30 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 9 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 20.64 mag. Found 84 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 8% of the
Genie image region.
Genie image analysis:
Found 11960.7 counts in the large background region of 5922.0 pixels or a rate
of 2.020 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 19.89 mag. for a
4-arcsec aperture.
Found 380.8 counts in the XRT position region of 199.0 pixels or a rate of
1.914 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.084 +/- 0.079 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.238 cps or 19.71 mag. The closest srclist
source has ra= 94.5294 dec= -44.9940 mag=19.23 sep=23.33". The closest Genie
source has ra= 94.5237 dec= -45.0042 mag=15.83 sep=31.39".
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?
735184385 270 U srclist found no candidates.
735184385 270 U image found no candidates.
List afterglow candidates for other finding charts.
735184227 112 WHITE srclist found no candidates.
735184227 112 WHITE image found no candidates.
735184989 874 WHITE srclist found no candidates.
735184989 874 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -44.99953
GRB_ERROR: 5.5
GRB_RA: 94.53404
IMAGE_START_TIME: 01:53:00
MAGNITUDE: 19.7
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT