image overlap message for exposure 2 of trigger 1253910
uvot_overlap.pl vrs. 2010-12-20b fem started at 260409d18h16m39s627167usUT
The observation of trigger 1253910 started 2024-09-12T01:52:40.6
Examining file 1253910_g360_uvot_sky_image.fits
The exposure ID is 747798760
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (124.6392,33.9985) with a roll angle of 114.6
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 (124.6246,33.9989) with a radius of 1.000 arc min
This is 0.730 arc min from the center of the uvot region
The area of the BAT error circle is 3.14 sq. arc min
The UVOT/BAT overlap is 2.87 sq. arc min or 0.91 of the BAT error circle
The XRT error circle is centered at (124.6347,33.9990) with a radius of 0.042 arc min
This is 0.230 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 2 of trigger 1253910
find_uvot_ag.pl vrs. 2023-04-25a fem started at 260409d18h16m41s337839usUT
Observation start time is 2024-09-12T01:52:40.6
Examining file 1253910_g360_uvot_catalog_image.fits
The exposure ID is 747798760
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 5 detected source(s) for 1253910_g360
Aspect correction adds 0.00011 degrees (0.027 sec of time = 0.34 arc sec) to RA
Aspect correction adds -0.00014 degrees (-0.52 arcsec) to Dec
Total aspect correction is 0.62 arcsec
Star catalogs centered at 124.6354 , 34.0063 with radius 2.59 arc min.
n_usno: 53 n_gsc: 37
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.8324
RA DEC Mag Color
bright star 0: 124.64064 (08:18:33.75) 34.02907 (+34:01:44.7) 10.83 USNO-V
Mean distance difference (CAT_DELTA) for 1 matched entries is 0.175" for 1253910_g360
Mean and std. dev of mag. difference (MAG_DELTA) are 0.532 and 0.000 for 1253910_g360
Found 4 entries without IDs and 1 entries that are acceptable afterglow candidates for 1253910_g360.
Acceptable entries have no ID, XRT distances < 6.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
3 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=124.6246 (08:18:29.90) DEC=33.9989 (+33:59:56.2)
XRT distances are from RA=124.6347 (08:18:32.32) DEC=33.9990 (+33:59:56.4)
*** WARNING 80 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1253910_g360 with genie
ra=124.63487 (08:18:32.37) dec=33.99903 (+33:59:56.5) +/- 0.8" mag=16.75+/-0.14
dist=0.6 REFID=5 major=1.0 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 12 of 12 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=124.63487 (08:18:32.37) dec=33.99903 (+33:59:56.5) +/- 0.8" mag=16.75+/-0.14 dist=0.6 REFID=5 flag=0
There are 47857.176 counts in the bkg source region of 6196.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.724 counts/pixel (5-sig UL in 4" is 19.36 mag) for 1253910_g360
There are 1177.0605 counts in the src source region of 48.000000 pixels.
Rate in src region with 4 arcsec radius is 24.522 counts/pixel for 1253910_g360
There are 9627.7090 counts in the cand_src_bkg source region of 1250.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 7.702 counts/pixel (5-sig UL in 4" is 19.36 mag) for 1253910_g360
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 19.91, XRT distances < 6.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1253910_747798760_260409d18h16m41s337839usUT_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(124.6392,33.9985,45")
fk5;-circle(124.634868608568,33.9990284648072,6")
Region file: 1253910_747798760_260409d18h16m41s337839usUT_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(124.634868608568,33.9990284648072,4")
Region file: 1253910_747798760_260409d18h16m41s337839usUT_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(124.634868608568,33.9990284648072,25")
fk5;-circle(124.634868608568,33.9990284648072,15")
image paragraph message for exposure 2 of trigger 1253910
------ Start for Possible Stand-alone Circular ----
In response to GRB240912 (Swift/BAT trigger 1253910) at 01:46:39 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
327 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 08:18:32.37 = 124.63487
DEC(J2000) = +33:59:56.5 = 33.99903
with a 90%-confidence error radius of about 0.75 arc sec. This position is 0.6
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.75 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.054.
------- notes for trigger 1253910 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 260409d18h16m42s966339usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1253910
-expid=747798760 -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/1253910/
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 747798760.56696 or about 2024:256:01:52:35 UT
Found 210 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 29 sources in
srclist catalog. Found 16 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 5 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 4 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
19.91 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?
747798760 326 U 124.63498 33.99897 17.07/18.1 0.9 srclist Yes
747798760 326 U 124.63487 33.99903 16.75/19.9 0.6 image Yes
List afterglow candidates for other finding charts.
747798548 114 WHITE 124.63496 33.99892 17.75/19.2 0.9 srclist Yes
747798548 114 WHITE 124.63502 33.99896 17.40/20.2 1.1 image Yes
747799314 880 WHITE 124.63505 33.99893 18.26/19.2 1.2 srclist Yes
747799314 880 WHITE 124.63494 33.99896 17.83/20.1 0.8 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 33.99903
GRB_ERROR: 0.75
GRB_RA: 124.63487
IMAGE_START_TIME: 01:52:35
MAGNITUDE: 16.75
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT