image overlap message for exposure 2 of trigger 1405083
uvot_overlap.pl vrs. 2010-12-20b fem started at 251018d19h01m04s138211usUT
The observation of trigger 1405083 started 2025-10-18T03:17:34.9
Examining file ./1405083_g331_uvot_sky_image.fits
The exposure ID is 782450254
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (282.0351,-37.0287) with a roll angle of 268.8
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 (282.0710,-37.0280) with a radius of 3.000 arc min
This is 1.721 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 6.79 sq. arc min or 0.24 of the BAT error circle
The XRT error circle is centered at (282.0422,-37.0292) with a radius of 0.040 arc min
This is 0.343 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 1405083
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251018d19h01m15s269765usUT
Observation start time is 2025-10-18T03:17:34.9
Examining file ./1405083_g331_uvot_catalog_image.fits
The exposure ID is 782450254
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 38 detected source(s) for 1405083_g331
Aspect correction adds -0.00120 degrees (-0.288 sec of time = -3.45 arc sec) to RA
Aspect correction adds -0.00022 degrees (-0.79 arcsec) to Dec
Total aspect correction is 3.54 arcsec
Star catalogs centered at 282.0335 , -37.0312 with radius 2.71 arc min.
n_usno: 391 n_gsc: 448
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.8511
RA DEC Mag Color
bright star 0: 282.05920 (18:48:14.21) -37.03411 (-37:02:02.8) 11.85 GSC-V
Mean distance difference (CAT_DELTA) for 36 matched entries is 0.489" for 1405083_g331
Mean and std. dev of mag. difference (MAG_DELTA) are 1.319 and 0.530 for 1405083_g331
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 1405083_g331.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=282.0710 (18:48:17.04) DEC=-37.0280 (-37:01:40.8)
XRT distances are from RA=282.0422 (18:48:10.13) DEC=-37.0292 (-37:01:45.2)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1405083_g331 with genie
ra=282.04271 (18:48:10.25) dec=-37.02337 (-37:01:24.1) +/- 0.7" mag=18.32+/-0.16
dist=21.1 REFID=16 major=1.2 minor=1.1 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 83.0 arc sec from the BAT position.
Found 12 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
282.0421 -37.0266 11.7 -1 USNO-B1 18.52 18.35 18.43
282.0425 -37.0245 4.1 -1 USNO-B1 99.99 17.05 99.99
282.0424 -37.0240 2.4 -1 USNO-B1 16.78 15.38 16.00 *
282.0489 -37.0245 18.4 -1 USNO-B1 19.04 17.89 18.40
282.0430 -37.0193 14.5 -1 USNO-B1 17.69 18.18 17.96
282.0454 -37.0204 13.2 -1 USNO-B1 19.14 18.49 18.78
282.0419 -37.0266 11.7 -1 GSC2.3 18.35 19.48 99.99
282.0423 -37.0243 3.7 -1 GSC2.3 15.38 16.72 16.56
282.0487 -37.0246 17.9 -1 GSC2.3 18.10 19.68 99.99
282.0428 -37.0194 14.3 -1 GSC2.3 18.24 18.43 99.99
282.0472 -37.0218 14.1 -1 GSC2.3 19.65 21.19 99.99
282.0456 -37.0203 13.9 -1 GSC2.3 19.13 20.05 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 7 in the list of sources is a candidate afterglow for 1405083_g331 with genie
ra=282.03211 (18:48:07.71) dec=-37.02619 (-37:01:34.3) +/- 0.7" mag=18.18+/-0.16
dist=31.0 REFID=21 major=1.2 minor=0.9 flag=2 (blended)
*** The position of this source is inconsistent with the XRT position.
The position is 111.9 arc sec from the BAT position.
Found 15 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
282.0332 -37.0254 4.4 -1 USNO-B1 18.03 14.25 15.93
282.0317 -37.0255 2.9 -1 USNO-B1 15.69 14.06 14.79 *
282.0356 -37.0248 11.3 -1 USNO-B1 18.03 17.32 17.64
282.0340 -37.0242 9.0 -1 USNO-B1 17.93 17.75 17.83
282.0355 -37.0236 13.4 -1 USNO-B1 15.51 17.16 16.43
282.0272 -37.0246 15.2 -1 USNO-B1 18.01 17.93 17.97
282.0338 -37.0216 17.2 -1 USNO-B1 18.81 18.43 18.60
282.0263 -37.0231 20.0 -1 USNO-B1 18.48 18.46 18.47
282.0321 -37.0261 0.4 -1 GSC2.3 15.28 16.99 16.10 *
282.0356 -37.0249 11.0 -1 GSC2.3 17.68 18.94 17.80
282.0308 -37.0248 6.2 -1 GSC2.3 15.48 17.43 16.00
282.0338 -37.0241 9.0 -1 GSC2.3 17.89 18.88 99.99
282.0273 -37.0247 15.0 -1 GSC2.3 19.36 19.08 99.99
282.0336 -37.0216 17.2 -1 GSC2.3 18.01 19.88 99.99
282.0279 -37.0220 19.4 -1 GSC2.3 19.87 99.99 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 9 in the list of sources is a candidate afterglow for 1405083_g331 with genie
ra=282.03095 (18:48:07.43) dec=-37.02471 (-37:01:29.0) +/- 0.6" mag=17.75+/-0.15
dist=36.2 REFID=20 major=1.0 minor=0.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 115.7 arc sec from the BAT position.
Found 16 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
282.0332 -37.0254 6.9 -1 USNO-B1 18.03 14.25 15.93
282.0317 -37.0255 3.5 -1 USNO-B1 15.69 14.06 14.79 *
282.0356 -37.0248 13.4 -1 USNO-B1 18.03 17.32 17.64
282.0340 -37.0242 8.9 -1 USNO-B1 17.93 17.75 17.83
282.0355 -37.0236 13.6 -1 USNO-B1 15.51 17.16 16.43
282.0272 -37.0246 10.7 -1 USNO-B1 18.01 17.93 17.97
282.0338 -37.0216 13.8 -1 USNO-B1 18.81 18.43 18.60
282.0263 -37.0231 14.5 -1 USNO-B1 18.48 18.46 18.47
282.0321 -37.0261 6.0 -1 GSC2.3 15.28 16.99 16.10
282.0356 -37.0249 13.3 -1 GSC2.3 17.68 18.94 17.80
282.0308 -37.0248 0.6 -1 GSC2.3 15.48 17.43 16.00 *
282.0338 -37.0241 8.4 -1 GSC2.3 17.89 18.88 99.99
282.0273 -37.0247 10.6 -1 GSC2.3 19.36 19.08 99.99
282.0336 -37.0216 13.7 -1 GSC2.3 18.01 19.88 99.99
282.0262 -37.0231 14.9 -1 GSC2.3 18.83 19.71 99.99
282.0279 -37.0220 13.2 -1 GSC2.3 19.87 99.99 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
Found 2 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
282.0421 -37.0266 9.5 -1 USNO-B1 18.52 18.35 18.43
282.0419 -37.0266 9.6 -1 GSC2.3 18.35 19.48 99.99
The closest star is 9.50" away.
List UVOT sources within 10" of the XRT position:
There are 25663.732 counts in the bkg source region of 5208.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.928 counts/pixel (5-sig UL in 4" is 19.60 mag) for 1405083_g331
There are 1017.1167 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 5.111 counts/pixel for 1405083_g331
There are 4684.4434 counts in the xrt_bkg source region of 974.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 4.809 counts/pixel (5-sig UL in 4" is 19.61 mag) for 1405083_g331
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 20.15, XRT distances < 6",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1405083_782450254_251018d19h01m15s269765usUT_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(282.0351,-37.0287,45")
fk5;-circle(282.042710343525,-37.0233675379657,6")
fk5;-circle(282.045814162487,-37.0323941931036,6")
fk5;-circle(282.049225005268,-37.0304387718888,6")
fk5;-circle(282.052435251983,-37.0263961617525,6")
fk5;-circle(282.043088719758,-37.0193679048434,6")
fk5;-circle(282.05247128323,-37.0288746036874,6")
fk5;-circle(282.033986415707,-37.0239971939804,6")
fk5;-circle(282.032114450675,-37.0261893074425,6")
fk5;-circle(282.030951113862,-37.0247083439816,6")
fk5;-circle(282.035147896887,-37.017972539157,6")
fk5;-circle(282.035677852164,-37.0369258827312,6")
fk5;-circle(282.030024286965,-37.0171059706111,6")
fk5;-circle(282.030346763316,-37.0153062581435,6")
fk5;-circle(282.022481418588,-37.023282710432,6")
fk5;-circle(282.021369073857,-37.0209334672877,6")
Region file: 1405083_782450254_251018d19h01m15s269765usUT_xrt.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(282.04221,-37.02922,8")
Region file: 1405083_782450254_251018d19h01m15s269765usUT_xrt_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(282.04221,-37.02922,25")
fk5;-circle(282.04221,-37.02922,15")
fk5;-circle(282.042710343525,-37.0233675379657,6")
fk5;-circle(282.045814162487,-37.0323941931036,6")
fk5;-circle(282.049225005268,-37.0304387718888,6")
fk5;-circle(282.05247128323,-37.0288746036874,6")
fk5;-circle(282.033986415707,-37.0239971939804,6")
fk5;-circle(282.032114450675,-37.0261893074425,6")
image paragraph message for exposure 2 of trigger 1405083
SRCLIST PROBLEM: high density of stars, srclist filled telemetry buffer
------ Start for Possible Stand-alone Circular ----
In response to GRB251018 (Swift/BAT trigger 1405083) at 03:12:02 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
295 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the
XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The
8'x8' region for the list of sources generated on-board covers 100% of the XRT
error circle. Because of the density of catalogued stars, further analysis is
required to report an upper limit for any afterglow in the region. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.101.
------- notes for trigger 1405083 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251018d19h01m20s033697usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1405083
-expid=782450254 -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/1405083/
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 782450254.85812 or about 2025:292:03:17:29 UT
Found 2049 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 41% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 64 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.12 mag.
Found 38 source(s) in Genie image catalog. Found 3 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.15 mag. Found 433 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
40% of the Genie image region.
Genie image analysis:
Found 25663.7 counts in the large background region of 5208.0 pixels or a rate
of 4.928 counts/pixel in a radius of 45.0 arcsec. Based on this background, the
typical 5-sigma UL at a random point in the Genie image is 19.39 mag. for a
4-arcsec aperture.
Found 1017.1 counts in the XRT position region of 199.0 pixels or a rate of
5.111 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.240 +/- 0.139 (1-sigma) cps or
19.68 mag and a range from 19.18 to 20.62 mag. The 3-sigma UL at the XRT
position is 0.658 cps or 18.59 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.41 mag. The closest
srclist source has ra= 282.0432 dec= -37.0195 mag=17.59 sep=35.00". The closest
Genie source has ra= 282.0458 dec= -37.0324 mag=18.55 sep=15.42".
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?
782450254 295 U srclist found no candidates.
782450254 295 U image found no candidates.
List afterglow candidates for other finding charts.
782450042 83 ? srclist data are not available.
782450042 83 WHITE 282.04183 -37.02840 17.96/20.4 3.1 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -37.02922
GRB_ERROR: 6
GRB_RA: 282.04221
IMAGE_START_TIME: 03:17:29
MAGNITUDE: 18.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT