image overlap message for exposure 1 of trigger 1404904
uvot_overlap.pl vrs. 2010-12-20b fem started at 251017d12h56m42s694972usUT
The observation of trigger 1404904 started 2025-10-17T08:43:21.3
Examining file ./1404904_g156_uvot_sky_image.fits
The exposure ID is 782383401
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (335.3928,7.0386) with a roll angle of 263.7
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 (335.3860,7.0510) with a radius of 3.000 arc min
This is 0.845 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 7.17 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (335.4013,7.0401) with a radius of 0.035 arc min
This is 0.516 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1404904
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251017d12h56m46s830851usUT
Observation start time is 2025-10-17T08:43:21.3
Examining file ./1404904_g156_uvot_catalog_image.fits
The exposure ID is 782383401
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 12 detected source(s) for 1404904_g156
Aspect correction adds -0.00012 degrees (-0.030 sec of time = -0.44 arc sec) to RA
Aspect correction adds -0.00005 degrees (-0.18 arcsec) to Dec
Total aspect correction is 0.48 arcsec
Star catalogs centered at 335.3945 , 7.0391 with radius 2.63 arc min.
n_usno: 63 n_gsc: 67
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 9.81514
RA DEC Mag Color
bright star 0: 335.36962 (22:21:28.71) 7.03010 (+07:01:48.4) 9.82 USNO-V
Mean distance difference (CAT_DELTA) for 7 matched entries is 0.220" for 1404904_g156
Mean and std. dev of mag. difference (MAG_DELTA) are 1.084 and 0.268 for 1404904_g156
Found 5 entries without IDs and 1 entries that are acceptable afterglow candidates for 1404904_g156.
Acceptable entries have no ID, XRT distances < 5.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
4 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=335.3860 (22:21:32.64) DEC= 7.0510 (+07:03:03.6)
XRT distances are from RA=335.4013 (22:21:36.32) DEC= 7.0401 (+07:02:24.3)
*** WARNING 41 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1404904_g156 with genie
ra=335.40098 (22:21:36.24) dec=7.03990 (+07:02:23.6) +/- 0.8" mag=20.42+/-0.21
dist=1.4 REFID=6 major=0.9 minor=0.9 flag=0
Found 5 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
335.4016 7.0374 9.3 -1 USNO-B1 18.98 17.80 18.32
335.4040 7.0395 11.0 -1 USNO-B1 18.76 17.27 17.93
335.4053 7.0410 16.1 -1 USNO-B1 99.99 18.84 99.99
335.4041 7.0395 11.1 -1 GSC2.3 17.35 18.97 18.40
335.4054 7.0411 16.4 -1 GSC2.3 19.78 99.99 99.99
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 3 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
335.4016 7.0374 9.7 -1 USNO-B1 18.98 17.80 18.32
335.4040 7.0395 9.9 -1 USNO-B1 18.76 17.27 17.93
335.4041 7.0395 10.0 -1 GSC2.3 17.35 18.97 18.40
The closest star is 9.71" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=335.40098 (22:21:36.24) dec=7.03990 (+07:02:23.6) +/- 0.8" mag=20.42+/-0.21 dist=1.4 REFID=6 flag=0
There are 48964.207 counts in the bkg source region of 5768.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 8.489 counts/pixel (5-sig UL in 4" is 20.19 mag) for 1404904_g156
There are 564.23389 counts in the src source region of 52.000000 pixels.
Rate in src region with 4 arcsec radius is 10.851 counts/pixel for 1404904_g156
There are 9742.9375 counts in the cand_src_bkg source region of 1154.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 8.443 counts/pixel (5-sig UL in 4" is 20.19 mag) for 1404904_g156
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 20.74, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1404904_782383401_251017d12h56m46s830851usUT_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(335.3928,7.0386,45")
fk5;-circle(335.400981143265,7.03990131193336,6")
fk5;-circle(335.404086489197,7.03949131511851,6")
fk5;-circle(335.404947812732,7.04487491892814,6")
fk5;-circle(335.393797476194,7.03341711239685,6")
fk5;-circle(335.388310520011,7.04515418820952,6")
fk5;-circle(335.387186418102,7.04359112101501,6")
fk5;-circle(335.381741317229,7.02994851838341,6")
Region file: 1404904_782383401_251017d12h56m46s830851usUT_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(335.400981143265,7.03990131193336,4")
Region file: 1404904_782383401_251017d12h56m46s830851usUT_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(335.400981143265,7.03990131193336,25")
fk5;-circle(335.400981143265,7.03990131193336,15")
fk5;-circle(335.404086489197,7.03949131511851,6")
fk5;-circle(335.404947812732,7.04487491892814,6")
image paragraph message for exposure 1 of trigger 1404904
------ Start for Possible Stand-alone Circular ----
In response to GRB251017 (Swift/BAT trigger 1404904) at 08:40:44 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 120 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 22:21:36.24 = 335.40098
DEC(J2000) = +07:02:23.6 = 7.03990
with a 90%-confidence error radius of about 0.77 arc sec. This position is 1.4
arc sec. from the center of the XRT error circle. The estimated magnitude is
20.42 with a 1-sigma error of about 0.21. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.108.
------- notes for trigger 1404904 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251017d12h56m53s965895usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1404904
-expid=782383401 -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/1404904/
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 782383401.27886 or about 2025:291:08:43:16 UT
Found 357 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 148 sources in
srclist catalog. Found 104 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 12 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 5 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.74 mag. Found 67 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 6% of the Genie image region.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 335.4009 dec= 7.0399 mag=19.93 sep=1.66".
The closest srclist source has ra= 335.4009 dec= 7.0399 mag=19.93 sep=1.66".
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?
782383401 119 WHITE 335.40091 7.03989 19.93/19.2 1.7 srclist Yes
782383401 119 WHITE 335.40098 7.03990 20.42/20.7 1.4 image Yes
List afterglow candidates for other finding charts.
782383613 331 U srclist found no candidates.
782383613 331 U image found no candidates.
782384142 860 WHITE srclist found no candidates.
782384142 860 WHITE 335.40099 7.04003 21.48/20.8 1.7 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 7.03990
GRB_ERROR: 0.77
GRB_RA: 335.40098
IMAGE_START_TIME: 08:43:16
MAGNITUDE: 20.42
MAG_ERROR: 0.21
MESSAGE_TYPE: ACK
SOURCE: XRT