image overlap message for exposure 1 of trigger 1340561
uvot_overlap.pl vrs. 2010-12-20b fem started at 250807d19h36m20s712858usUT
The observation of trigger 1340561 started 2025-08-07T15:46:17.6
Examining file ./1340561_g189_uvot_sky_image.fits
The exposure ID is 776274377
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (15.6494,-59.1198) with a roll angle of 110.1
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 (15.5850,-59.0940) with a radius of 3.000 arc min
This is 2.514 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 4.63 sq. arc min or 0.16 of the BAT error circle
The XRT error circle is centered at (15.6371,-59.1190) with a radius of 0.040 arc min
This is 0.382 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
image afterglow message for exposure 1 of trigger 1340561
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250807d19h36m23s430074usUT
Observation start time is 2025-08-07T15:46:17.6
Examining file ./1340561_g189_uvot_catalog_image.fits
The exposure ID is 776274377
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 3 detected source(s) for 1340561_g189
Aspect correction adds 0.00091 degrees (0.219 sec of time = 1.69 arc sec) to RA
Aspect correction adds -0.00081 degrees (-2.92 arcsec) to Dec
Total aspect correction is 3.37 arcsec
Star catalogs centered at 15.6310 , -59.1255 with radius 2.40 arc min.
n_usno: 53 n_gsc: 34
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 2 matched entries is 1.305" for 1340561_g189
Mean and std. dev of mag. difference (MAG_DELTA) are 0.847 and 0.516 for 1340561_g189
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1340561_g189.
Acceptable entries have no ID, XRT distances < 6", 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=15.5850 (01:02:20.40) DEC=-59.0940 (-59:05:38.4)
XRT distances are from RA=15.6371 (01:02:32.90) DEC=-59.1190 (-59:07:08.3)
*** WARNING 33 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1340561_g189 with genie
ra=15.63741 (01:02:32.98) dec=-59.11887 (-59:07:07.9) +/- 0.7" mag=16.31+/-0.14
dist=0.7 REFID=2 major=0.9 minor=0.9 flag=0
Found 0 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)
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=15.63741 (01:02:32.98) dec=-59.11887 (-59:07:07.9) +/- 0.7" mag=16.31+/-0.14 dist=0.7 REFID=2 flag=0
There are 93806.453 counts in the bkg source region of 6205.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 15.118 counts/pixel (5-sig UL in 4" is 19.88 mag) for 1340561_g189
There are 4408.4995 counts in the src source region of 50.000000 pixels.
Rate in src region with 4 arcsec radius is 88.170 counts/pixel for 1340561_g189
There are 19093.689 counts in the cand_src_bkg source region of 1249.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 15.287 counts/pixel (5-sig UL in 4" is 19.87 mag) for 1340561_g189
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 20.43, XRT distances < 6",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1340561_776274377_250807d19h36m23s430074usUT_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(15.6494,-59.1198,45")
fk5;-circle(15.6374064497512,-59.1188695620506,6")
Region file: 1340561_776274377_250807d19h36m23s430074usUT_cand_src.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(15.6374064497512,-59.1188695620506,4")
Region file: 1340561_776274377_250807d19h36m23s430074usUT_cand_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(15.6374064497512,-59.1188695620506,25")
fk5;-circle(15.6374064497512,-59.1188695620506,15")
image paragraph message for exposure 1 of trigger 1340561
------ Start for Possible Stand-alone Circular ----
In response to GRB250807 (Swift/BAT trigger 1340561) at 15:43:07 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 153 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 01:02:32.98 = 15.63741
DEC(J2000) = -59:07:07.9 = -59.11887
with a 90%-confidence error radius of about 0.75 arc sec. This position is 0.7
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.31 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.016.
------- notes for trigger 1340561 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250807d19h36m28s471506usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1340561
-expid=776274377 -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/1340561/
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 776274377.61158 or about 2025:220:15:46:12 UT
Found 463 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 46 sources in
srclist catalog. Found 25 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 3 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
20.43 mag. Found 49 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 5% 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?
776274377 153 WHITE 15.63731 -59.11888 16.70/19.2 0.5 srclist Yes
776274377 153 WHITE 15.63741 -59.11887 16.31/20.4 0.7 image Yes
List afterglow candidates for other finding charts.
776274536 312 ? srclist data are not available.
776274536 312 U 15.63670 -59.11817 15.03/18.6 2.6 image No
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -59.11887
GRB_ERROR: 0.75
GRB_RA: 15.63741
IMAGE_START_TIME: 15:46:12
MAGNITUDE: 16.31
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT