srclist overlap message for exposure 2 of trigger 1246989
uvot_overlap.pl vrs. 2010-12-20b fem started at 240805d23h23m21s827749usUT
The observation of trigger 1246989 started 2024-08-05T14:34:28.9
Examining file ./1246989_g333_uvot_sky_srclist.fits
The exposure ID is 744561268
The exposure time is undefined.
The filter is U.
The uvot region is centered at (254.2082,18.3192) with a roll angle of 296.2
It is square with sides of 8.03 arc min. for an area of 64.51 sq arc min
The BAT error circle is centered at (254.2390,18.3230) with a radius of 3.000 arc min
This is 1.768 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 26.96 sq. arc min or 0.95 of the BAT error circle
The XRT error circle is centered at (254.2125,18.3196) with a radius of 0.052 arc min
This is 0.247 arc min from the center of the uvot region
The area of the XRT error circle is 0.008 sq. arc min
The UVOT/XRT overlap is 0.008 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1246989
find_uvot_ag.pl vrs. 2023-04-25a fem started at 240805d23h23m31s542719usUT
Observation start time is 2024-08-05T14:34:28.9
Examining file ./1246989_g333_uvot_catalog_srclist.fits
The exposure ID is 744561268
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 75 detected source(s) for 1246989_g333
Aspect correction adds -0.00255 degrees (-0.611 sec of time = -8.70 arc sec) to RA
Aspect correction adds 0.00109 degrees ( 3.91 arcsec) to Dec
Total aspect correction is 9.54 arcsec
Star catalogs centered at 254.2020 , 18.3258 with radius 5.89 arc min.
n_usno: 376 n_gsc: 438
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 11.15912
RA DEC Mag Color
bright star 0: 254.16168 (16:56:38.80) 18.30884 (+18:18:31.8) 11.50 USNO-V
bright star 1: 254.23502 (16:56:56.41) 18.35983 (+18:21:35.4) 11.16 USNO-V
bright star 2: 254.16356 (16:56:39.25) 18.23969 (+18:14:22.9) 11.95 USNO-V
Mean distance difference (CAT_DELTA) for 51 matched entries is 0.665" for 1246989_g333
Mean and std. dev of mag. difference (MAG_DELTA) are 1.225 and 0.754 for 1246989_g333
Found 24 entries without IDs and 0 entries that are acceptable afterglow candidates for 1246989_g333.
Acceptable entries have no ID, XRT distances < 7.75", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
19 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=254.2390 (16:56:57.36) DEC=18.3230 (+18:19:22.8)
XRT distances are from RA=254.2125 (16:56:51.01) DEC=18.3196 (+18:19:10.5)
*** WARNING 32 per cent of entries have no IDs.
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 14:
ra=254.23312 dec= 18.35823 +/- 1.1" mag=18.92+/-0.35 dist=155.9 REFID=42
Found 1 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
254.2127 18.3215 7.0 -1 USNO-B1 99.99 20.00 99.99
The closest star is 6.96" away.
List UVOT sources within 10" of the XRT position:
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 18.12, XRT distances < 7.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 1246989
------ Start for Possible Stand-alone Circular ----
In response to GRB240805 (Swift/BAT trigger 1246989) at 14:28:54 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
300 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
0.088.
------- notes for trigger 1246989 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 240805d23h23m33s677715usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1246989
-expid=744561268 -meonly -msg_srclist
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/1246989/
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 744561268.8974 or about 2024:218:14:34:23 UT
Found 435 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 75 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
18.12 mag.
Found 10 source(s) in Genie image catalog. Found 2 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.51 mag. Found 91 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
8% of the Genie image region. The Genie image is INCOMPLETE with 214 null
pixels.
Genie image analysis:
Found 15769.0 counts in the large background region of 6207.0 pixels or a rate
of 2.541 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 19.77 mag. for a
4-arcsec aperture.
Found 513.1 counts in the XRT position region of 199.0 pixels or a rate of
2.578 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.075 +/- 0.098 (1-sigma) cps or
20.96 mag and a range from 20.05 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.368 cps or 19.23 mag. The closest srclist source has ra= 254.2277
dec= 18.3272 mag=15.21 sep=58.76". The closest Genie source has ra= 254.2134
dec= 18.3262 mag=19.20 sep=23.95".
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?
744561268 299 U srclist found no candidates.
744561268 299 U image found no candidates.
List afterglow candidates for other finding charts.
744561056 87 WHITE srclist found no candidates.
744561056 87 WHITE image found no candidates.
744561846 877 WHITE srclist found no candidates.
744561846 877 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 18.31958
GRB_ERROR: 7.75
GRB_RA: 254.21254
IMAGE_START_TIME: 14:34:23
MAGNITUDE: 19.2
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT