srclist overlap message for exposure 2 of trigger 1342439
uvot_overlap.pl vrs. 2010-12-20b fem started at 250814d07h54m20s458113usUT
The observation of trigger 1342439 started 2025-08-14T07:50:00.4
Examining file ./1342439_g900_uvot_sky_srclist.fits
The exposure ID is 776850600
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (306.3038,48.4049) with a roll angle of 340.8
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (306.3290,48.3910) with a radius of 3.000 arc min
This is 1.304 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 (306.3080,48.3990) with a radius of 0.038 arc min
This is 0.390 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1342439
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250814d07h54m34s536609usUT
Observation start time is 2025-08-14T07:50:00.4
Examining file ./1342439_g900_uvot_catalog_srclist.fits
The exposure ID is 776850600
The exposure is 150.000 sec.
The bin size is 2 pixels
The filter is WHITE
There are 190 detected source(s) for 1342439_g900
*** WARNING -- the sources have filled the available telemetry buffer (190).
srclist_overlap returned: bat_overlap 1.000
srclist_overlap returned: xrt_overlap 1.000
Dimmest detected source in 1342439_g900 has mag 18.88
Aspect correction adds 0.00054 degrees (0.129 sec of time = 1.28 arc sec) to RA
Aspect correction adds 0.00164 degrees ( 5.89 arcsec) to Dec
Total aspect correction is 6.03 arcsec
Star catalogs centered at 306.2929 , 48.4093 with radius 8.68 arc min.
n_usno: 3457 n_gsc: 3954
*** WARNING -- bright star catalog has 8 entries brighter than 12 mag
The brightest has mag 9.85516
RA DEC Mag Color
bright star 0: 306.33972 (20:25:21.53) 48.43374 (+48:26:01.5) 11.50 USNO-V
bright star 1: 306.29127 (20:25:09.91) 48.33990 (+48:20:23.6) 11.72 USNO-V
bright star 2: 306.34524 (20:25:22.86) 48.34556 (+48:20:44.0) 11.78 USNO-V
bright star 3: 306.44278 (20:25:46.27) 48.39407 (+48:23:38.7) 11.41 GSC-V
bright star 4: 306.38031 (20:25:31.27) 48.49613 (+48:29:46.1) 11.71 GSC-V
bright star 5: 306.45745 (20:25:49.79) 48.40895 (+48:24:32.2) 9.86 USNO-V
bright star 6: 306.46069 (20:25:50.57) 48.43093 (+48:25:51.4) 11.18 USNO-V
bright star 7: 306.46686 (20:25:52.05) 48.40384 (+48:24:13.8) 11.83 GSC-V
Mean distance difference (CAT_DELTA) for 185 matched entries is 0.829" for 1342439_g900
Mean and std. dev of mag. difference (MAG_DELTA) are 2.119 and 0.527 for 1342439_g900
Found 7 entries without IDs and 1 entries that are acceptable afterglow candidates for 1342439_g900.
Acceptable entries have no ID, XRT distances < 5.75", 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=306.3290 (20:25:18.96) DEC=48.3910 (+48:23:27.6)
XRT distances are from RA=306.3080 (20:25:13.92) DEC=48.3990 (+48:23:56.5)
-----------------
Entry 51 in the list of sources is a candidate afterglow for 1342439_g900 with 1x1 stamp
ra=306.35278 (20:25:24.67) dec=48.35008 (+48:21:00.3) +/- 1.1" mag=17.55+/-0.35
dist=206.2 REFID=180
*** The position of this source is inconsistent with the XRT position.
The position is 157.9 arc sec from the BAT position.
src: 51 distr. of nearby unmatched sources: 0 0 0 0 1
Found 9 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
306.3533 48.3509 3.3 -1 USNO-B1 13.69 12.20 12.86 *
306.3529 48.3490 3.8 -1 USNO-B1 18.99 17.20 17.99 *
306.3524 48.3485 5.8 -1 USNO-B1 19.81 17.89 18.74
306.3582 48.3495 13.1 -1 USNO-B1 20.17 18.86 19.44
306.3555 48.3482 9.4 -1 USNO-B1 20.33 18.93 19.55
306.3595 48.3500 16.1 -1 USNO-B1 19.60 18.52 19.00
306.3534 48.3508 2.9 -1 GSC2.3 99.99 13.25 12.96 *
306.3583 48.3493 13.4 -1 GSC2.3 99.99 21.09 99.99
306.3556 48.3480 10.0 -1 GSC2.3 18.67 20.71 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 0 entries in star catalog(s) within 10" of the XRT position.
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 19.22, XRT distances < 5.75",
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 1342439
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no image afterglow info
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB250814 (Swift/BAT trigger 1342439) at 07:34:59 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of nominal 150.000 seconds with the White
filter starting 864 seconds after the BAT trigger. No credible afterglow
candidate has been found in the initial data products. Data from the 2.7'x2.7'
sub-image are not available at this time. 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 1.061.
------- notes for trigger 1342439 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250814d07h54m38s263859usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1342439
-expid=776850600 -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/1342439/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
*** Warning -- no exposure found, using srclist assumed value.
XRT position found for srclist. BAT position found.
UVOT exposure began at MET 776850600.42688 or about 2025:227:07:49:55 UT
Found 3869 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 35% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 7 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 19.22 mag.
The number of srclist sources filled the available telemetry. The weakest
source detected was 18.88 mag. The closest srclist source has ra= 306.2971 dec=
48.3934 mag=16.01 sep=33.18".
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?
776850600 864 WHITE srclist found no candidates.
776850600 864 ? image data are not available.
List afterglow candidates for other finding charts.
776849915 179 U srclist found no candidates.
776849915 179 U image found no candidates.
------- Tokens for Quick GCN -------