srclist overlap message for exposure 2 of trigger 1247745
uvot_overlap.pl vrs. 2010-12-20b fem started at 240809d14h09m12s392203usUT
The observation of trigger 1247745 started 2024-08-09T08:36:13.4
Examining file ./1247745_g343_uvot_sky_srclist.fits
The exposure ID is 744885373
The exposure time is undefined.
The filter is U.
The uvot region is centered at (237.5400,-2.3173) with a roll angle of 285.5
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 (237.5510,-2.3210) with a radius of 3.000 arc min
This is 0.695 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 28.27 sq. arc min or 1.00 of the BAT error circle
The XRT error circle is centered at (237.5440,-2.3179) with a radius of 0.033 arc min
This is 0.241 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1247745
find_uvot_ag.pl vrs. 2023-04-25a fem started at 240809d14h09m23s171453usUT
Observation start time is 2024-08-09T08:36:13.4
Examining file ./1247745_g343_uvot_catalog_srclist.fits
The exposure ID is 744885373
The exposure is 249.912 sec.
The bin size is 2 pixels
The filter is U
There are 52 detected source(s) for 1247745_g343
Aspect correction adds -0.00218 degrees (-0.522 sec of time = -7.83 arc sec) to RA
Aspect correction adds 0.00052 degrees ( 1.86 arcsec) to Dec
Total aspect correction is 8.05 arcsec
Star catalogs centered at 237.5529 , -2.3144 with radius 5.81 arc min.
n_usno: 543 n_gsc: 481
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 9.9793
RA DEC Mag Color
bright star 0: 237.53078 (15:50:07.39) -2.36987 (-02:22:11.5) 9.98 USNO-V
bright star 1: 237.62365 (15:50:29.68) -2.34960 (-02:20:58.6) 10.46 USNO-V
Mean distance difference (CAT_DELTA) for 33 matched entries is 0.751" for 1247745_g343
Mean and std. dev of mag. difference (MAG_DELTA) are 1.744 and 1.069 for 1247745_g343
Found 20 entries without IDs and 2 entries that are acceptable afterglow candidates for 1247745_g343.
Acceptable entries have no ID, XRT distances < 5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
18 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=237.5510 (15:50:12.24) DEC=-2.3210 (-02:19:15.6)
XRT distances are from RA=237.5440 (15:50:10.56) DEC=-2.3179 (-02:19:04.4)
*** WARNING 38 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1247745_g343 with 5x5 stamp
ra=237.54397 (15:50:10.55) dec=-2.31752 (-02:19:03.1) +/- 1.1" mag=15.53+/-0.35
dist=1.3 REFID=4
src: 0 distr. of nearby unmatched sources: 0 0 0 0 0
Found 2 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
237.5421 -2.3128 18.4 -1 USNO-B1 20.42 19.18 19.73
237.5428 -2.3185 5.3 -1 GSC2.3 20.41 99.99 99.99
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 mag
-----------------
Entry 4 in the list of sources is a candidate afterglow for 1247745_g343 with 3x3 stamp
ra=237.57896 (15:50:18.95) dec=-2.33315 (-02:19:59.3) +/- 1.1" mag=19.50+/-0.35
dist=137.2 REFID=50
*** The position of this source is inconsistent with the XRT position.
The position is 109.7 arc sec from the BAT position.
src: 4 distr. of nearby unmatched sources: 0 1 0 0 0
Found 8 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
237.5772 -2.3340 6.9 -1 USNO-B1 13.49 12.16 12.75 *
237.5780 -2.3340 4.7 -1 USNO-B1 13.77 13.49 13.61
237.5815 -2.3291 17.2 -1 USNO-B1 20.90 19.80 20.29
237.5801 -2.3338 4.9 -1 USNO-B1 21.17 19.59 20.29
237.5815 -2.3343 10.0 -1 USNO-B1 20.74 20.35 20.52
237.5745 -2.3335 16.0 -1 GSC2.3 99.99 21.98 99.99
237.5780 -2.3340 4.6 -1 GSC2.3 12.13 13.45 99.99 *
237.5814 -2.3291 17.0 -1 GSC2.3 19.90 20.45 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
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
237.5428 -2.3185 4.7 -1 GSC2.3 20.41 99.99 99.99
The closest star is 4.69" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=237.54397 (15:50:10.55) dec=-2.31752 (-02:19:03.1) +/- 1.1" mag=15.53+/-0.35 dist=1.3 REFID=4
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 < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 1247745
Catalogued source 4.7" from XRT position may affect AG photometry.
------ Start for Possible Stand-alone Circular ----
In response to GRB240809 (Swift/BAT trigger 1247745) at 08:30:29 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
309 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 15:50:10.53 = 237.54387
DEC(J2000) = -02:19:02.9 = -2.31747
with a 90%-confidence error radius of about 0.74 arc sec. This position is 1.6
arc sec. from the center of the XRT error circle. The estimated magnitude is
15.07 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.249.
------- notes for trigger 1247745 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 240809d14h09m25s852847usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1247745
-expid=744885373 -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/1247745/
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 744885373.39378 or about 2024:222:08:36:08 UT
Found 539 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 11% of the srclist region. Found 52 sources in
srclist catalog. Found 20 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 2 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.44 mag. Found 73 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 11% of the Genie image region.
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?
744885373 309 U 237.54397 -2.31752 15.53/18.1 1.3 srclist Yes
744885373 309 U 237.54387 -2.31747 15.07/20.4 1.6 image Yes
List afterglow candidates for other finding charts.
744885161 97 WHITE 237.54389 -2.31750 13.86/19.2 1.5 srclist Yes
744885161 97 WHITE 237.54381 -2.31756 14.47/20.6 1.4 image Yes
744885928 864 WHITE 237.54380 -2.31760 17.34/19.2 9.4 srclist Yes
744885928 864 WHITE 237.54394 -2.31752 16.67/20.6 9.0 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -2.31747
GRB_ERROR: 0.74
GRB_RA: 237.54387
IMAGE_START_TIME: 08:36:08
MAGNITUDE: 15.07
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT