image overlap message for exposure 1 of trigger 1250617
uvot_overlap.pl vrs. 2010-12-20b fem started at 240825d23h26m15s674580usUT
The observation of trigger 1250617 started 2024-08-25T15:55:06.9
Examining file ./1250617_g126_uvot_sky_image.fits
The exposure ID is 746294106
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (344.5736,1.0308) with a roll angle of 39.8
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 (344.5510,1.0360) with a radius of 3.000 arc min
This is 1.390 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 7.09 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (344.5720,1.0268) with a radius of 0.045 arc min
This is 0.262 arc min from the center of the uvot region
The area of the XRT error circle is 0.006 sq. arc min
The UVOT/XRT overlap is 0.006 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1250617
find_uvot_ag.pl vrs. 2023-04-25a fem started at 240825d23h26m19s419803usUT
Observation start time is 2024-08-25T15:55:06.9
Examining file ./1250617_g126_uvot_catalog_image.fits
The exposure ID is 746294106
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 3 detected source(s) for 1250617_g126
Aspect correction adds 0.00211 degrees (0.508 sec of time = 7.61 arc sec) to RA
Aspect correction adds 0.00086 degrees ( 3.10 arcsec) to Dec
Total aspect correction is 8.22 arcsec
Star catalogs centered at 344.5653 , 1.0259 with radius 2.25 arc min.
n_usno: 35 n_gsc: 26
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 2 matched entries is 0.194" for 1250617_g126
Mean and std. dev of mag. difference (MAG_DELTA) are 0.997 and 0.164 for 1250617_g126
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1250617_g126.
Acceptable entries have no ID, XRT distances < 6.75", 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=344.5510 (22:58:12.24) DEC= 1.0360 (+01:02:09.6)
XRT distances are from RA=344.5720 (22:58:17.28) DEC= 1.0268 (+01:01:36.3)
*** WARNING 33 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1250617_g126 with genie
ra=344.57192 (22:58:17.26) dec=1.02686 (+01:01:36.7) +/- 0.7" mag=15.57+/-0.14
dist=0.5 REFID=1 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 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=344.57192 (22:58:17.26) dec=1.02686 (+01:01:36.7) +/- 0.7" mag=15.57+/-0.14 dist=0.5 REFID=1 flag=0
There are 58374.918 counts in the bkg source region of 6132.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 9.520 counts/pixel (5-sig UL in 4" is 20.13 mag) for 1250617_g126
There are 6764.5732 counts in the src source region of 49.000000 pixels.
Rate in src region with 4 arcsec radius is 138.053 counts/pixel for 1250617_g126
There are 12160.643 counts in the cand_src_bkg source region of 1248.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 9.744 counts/pixel (5-sig UL in 4" is 20.11 mag) for 1250617_g126
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 20.68, XRT distances < 6.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1250617_746294106_240825d23h26m19s419803usUT_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(344.5736,1.0308,45")
fk5;-circle(344.571917726061,1.026856556097,6")
fk5;-circle(344.561522560745,1.0325436116468,6")
Region file: 1250617_746294106_240825d23h26m19s419803usUT_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(344.571917726061,1.026856556097,4")
Region file: 1250617_746294106_240825d23h26m19s419803usUT_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(344.571917726061,1.026856556097,25")
fk5;-circle(344.571917726061,1.026856556097,15")
image paragraph message for exposure 1 of trigger 1250617
------ Start for Possible Stand-alone Circular ----
In response to GRB240825 (Swift/BAT trigger 1250617) at 15:52:59 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 92 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 22:58:17.26 = 344.57192
DEC(J2000) = +01:01:36.7 = 1.02686
with a 90%-confidence error radius of about 0.74 arc sec. This position is 0.5
arc sec. from the center of the XRT error circle. The estimated magnitude is
15.57 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.063.
------- notes for trigger 1250617 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 240825d23h26m22s353389usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1250617
-expid=746294106 -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/1250617/
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 746294106.88538 or about 2024:238:15:55:01 UT
Found 185 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 26 sources in
srclist catalog. Found 3 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
20.68 mag. Found 31 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 4% 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?
746294106 92 WHITE 344.57194 1.02689 15.98/19.2 0.5 srclist Yes
746294106 92 WHITE 344.57192 1.02686 15.57/20.7 0.5 image Yes
List afterglow candidates for other finding charts.
746294319 305 U 344.57216 1.02698 17.71/18.1 12.6 srclist Yes
746294319 305 U 344.57196 1.02680 16.91/20.5 11.7 image Yes
746294872 858 WHITE 344.57206 1.02682 18.44/19.2 12.0 srclist Yes
746294872 858 WHITE 344.57192 1.02680 17.94/20.7 11.6 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 1.02686
GRB_ERROR: 0.74
GRB_RA: 344.57192
IMAGE_START_TIME: 15:55:01
MAGNITUDE: 15.57
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT