srclist overlap message for exposure 2 of trigger 1042398
uvot_overlap.pl vrs. 2010-12-20b fem started at 210411d21h11m05s874045usUT
The observation of trigger 1042398 started 2021-04-11T15:10:56.9
Examining file ./1042398_g304_uvot_sky_srclist.fits
The exposure ID is 639846656
The exposure time is undefined.
The filter is U.
The uvot region is centered at (296.5679,-39.3711) with a roll angle of 79.4
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (296.5590,-39.3730) with a radius of 3.000 arc min
This is 0.430 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 28.27 sq. arc min or 1.00 of the BAT error circle
The XRT error circle is centered at (296.6112,-39.3979) with a radius of 0.033 arc min
This is 2.574 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1042398
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210411d21h11m15s595623usUT
Observation start time is 2021-04-11T15:10:56.9
Examining file ./1042398_g304_uvot_catalog_srclist.fits
The exposure ID is 639846656
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 190 detected source(s) for 1042398_g304
*** WARNING -- the sources have filled the available telemetry buffer (190).
srclist_overlap returned: bat_overlap 1.000
srclist_overlap returned: xrt_overlap 1.000
Dimmest detected source in 1042398_g304 has mag 18.64
Aspect correction adds 0.00249 degrees (0.599 sec of time = 6.94 arc sec) to RA
Aspect correction adds 0.00064 degrees ( 2.30 arcsec) to Dec
Total aspect correction is 7.32 arcsec
Star catalogs centered at 296.5688 , -39.3698 with radius 8.52 arc min.
n_usno: 1765 n_gsc: 0
*** WARNING -- bright star catalog has 5 entries brighter than 12 mag
The brightest has mag 8.04488
RA DEC Mag Color
bright star 0: 296.61001 (19:46:26.40) -39.38318 (-39:22:59.5) 11.81 USNO-V
bright star 1: 296.63208 (19:46:31.70) -39.42547 (-39:25:31.7) 8.04 USNO-V
bright star 2: 296.64143 (19:46:33.94) -39.47118 (-39:28:16.2) 11.29 USNO-V
bright star 3: 296.45329 (19:45:48.79) -39.45165 (-39:27:05.9) 11.82 USNO-V
bright star 4: 296.38873 (19:45:33.30) -39.39247 (-39:23:32.9) 11.34 USNO-V
Mean distance difference (CAT_DELTA) for 116 matched entries is 0.825" for 1042398_g304
Mean and std. dev of mag. difference (MAG_DELTA) are 1.569 and 0.739 for 1042398_g304
Found 76 entries without IDs and 5 entries that are acceptable afterglow candidates for 1042398_g304.
Acceptable entries have no ID, XRT distances < 5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
64 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=296.5590 (19:46:14.16) DEC=-39.3730 (-39:22:22.8)
XRT distances are from RA=296.6112 (19:46:26.69) DEC=-39.3979 (-39:23:52.6)
*** WARNING 40 per cent of entries have no IDs.
-----------------
Entry 5 in the list of sources is a candidate afterglow for 1042398_g304 with 1x1 stamp
ra=296.52010 (19:46:04.82) dec=-39.36391 (-39:21:50.1) +/- 1.1" mag=17.65+/-0.35
dist=281.6 REFID=125
*** The position of this source is inconsistent with the XRT position.
The position is 113.1 arc sec from the BAT position.
src: 5 distr. of nearby unmatched sources: 0 1 0 0 0
Found 13 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
296.5244 -39.3626 13.0 -1 USNO-B1 19.07 18.12 18.54
296.5238 -39.3625 11.4 -1 USNO-B1 18.24 16.87 17.48
296.5231 -39.3651 9.4 -1 USNO-B1 19.08 17.91 18.43
296.5223 -39.3647 6.7 -1 USNO-B1 99.99 17.05 99.99
296.5216 -39.3649 5.6 -1 USNO-B1 99.99 19.27 99.99
296.5216 -39.3639 4.2 -1 USNO-B1 20.52 18.33 19.30
296.5210 -39.3648 3.9 -1 USNO-B1 99.99 18.15 99.99 *
296.5213 -39.3621 7.3 -1 USNO-B1 13.02 99.99 99.99
296.5210 -39.3626 5.3 -1 USNO-B1 13.39 12.14 12.69 *
296.5193 -39.3673 12.3 -1 USNO-B1 17.90 15.46 16.54
296.5179 -39.3622 8.7 -1 USNO-B1 19.75 18.36 18.98
296.5185 -39.3586 19.4 -1 USNO-B1 17.93 17.95 17.94
296.5172 -39.3589 19.7 -1 USNO-B1 20.45 18.76 19.51
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 15 in the list of sources is a candidate afterglow for 1042398_g304 with 3x3 stamp
ra=296.52471 (19:46:05.93) dec=-39.40626 (-39:24:22.5) +/- 1.1" mag=18.26+/-0.35
dist=242.5 REFID=84
*** The position of this source is inconsistent with the XRT position.
The position is 153.1 arc sec from the BAT position.
src: 15 distr. of nearby unmatched sources: 0 2 0 0 0
Found 6 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
296.5270 -39.4029 13.7 -1 USNO-B1 19.66 19.26 19.44
296.5301 -39.4087 17.5 -1 USNO-B1 19.27 18.40 18.79
296.5253 -39.4058 2.4 -1 USNO-B1 17.33 19.31 18.43 *
296.5264 -39.4072 5.8 -1 USNO-B1 99.99 19.70 99.99
296.5228 -39.4077 7.6 -1 USNO-B1 13.52 12.30 12.84 *
296.5226 -39.4109 17.9 -1 USNO-B1 20.31 19.48 19.85
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 17 in the list of sources is a candidate afterglow for 1042398_g304 with 1x1 stamp
ra=296.52316 (19:46:05.56) dec=-39.40720 (-39:24:25.9) +/- 1.1" mag=17.13+/-0.35
dist=247.2 REFID=173
*** The position of this source is inconsistent with the XRT position.
The position is 158.4 arc sec from the BAT position.
src: 17 distr. of nearby unmatched sources: 1 1 0 0 0
Found 5 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
296.5270 -39.4029 18.8 -1 USNO-B1 19.66 19.26 19.44
296.5253 -39.4058 7.9 -1 USNO-B1 17.33 19.31 18.43
296.5264 -39.4072 9.0 -1 USNO-B1 99.99 19.70 99.99
296.5228 -39.4077 2.3 -1 USNO-B1 13.52 12.30 12.84 *
296.5226 -39.4109 13.6 -1 USNO-B1 20.31 19.48 19.85
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 20 in the list of sources is a candidate afterglow for 1042398_g304 with 3x3 stamp
ra=296.52195 (19:46:05.27) dec=-39.40731 (-39:24:26.3) +/- 1.1" mag=17.33+/-0.35
dist=250.6 REFID=68
*** The position of this source is inconsistent with the XRT position.
The position is 160.9 arc sec from the BAT position.
src: 20 distr. of nearby unmatched sources: 1 1 0 0 0
Found 4 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
296.5253 -39.4058 10.8 -1 USNO-B1 17.33 19.31 18.43
296.5264 -39.4072 12.4 -1 USNO-B1 99.99 19.70 99.99
296.5228 -39.4077 2.7 -1 USNO-B1 13.52 12.30 12.84 *
296.5226 -39.4109 13.2 -1 USNO-B1 20.31 19.48 19.85
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 29 in the list of sources is a candidate afterglow for 1042398_g304 with 1x1 stamp
ra=296.61208 (19:46:26.90) dec=-39.39766 (-39:23:51.6) +/- 1.1" mag=18.21+/-0.35
dist=2.6 REFID=120
src: 29 distr. of nearby unmatched sources: 0 0 0 0 0
Found 1 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
296.6069 -39.3968 14.7 -1 USNO-B1 18.58 17.23 17.83
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 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=296.61208 (19:46:26.90) dec=-39.39766 (-39:23:51.6) +/- 1.1" mag=18.21+/-0.35 dist=2.6 REFID=120
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 18.12, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 1042398
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no overlap
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB210411 (Swift/BAT trigger 1042398) at 15:05:51 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
278 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 none of the
XRT error circle. The 8'x8' region for the list of sources generated on-board
covers 100% of the XRT error circle. The list of sources is typically complete
to about 18.0 mag. No correction has been made for the expected extinction
corresponding to E(B-V) of 0.081.
------- notes for trigger 1042398 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210411d21h11m18s605986usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1042398
-expid=639846656 -meonly -msg_srclist
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/1042398/
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 639846656.87702 or about 2021:101:15:10:51 UT
Found 1761 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 16% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 76 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 15 source(s) in Genie image catalog. Found 0 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.43 mag. Found 177 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
18% of the Genie image region. The XRT position was OUTSIDE the star catalog
search region.
Genie image analysis:
Found 17084.6 counts in the large background region of 5716.0 pixels or a rate
of 2.989 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 19.72 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 18.64 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 296.6121 dec= -39.3977 mag=18.21 sep=2.62".
The closest srclist source has ra= 296.6121 dec= -39.3977 mag=18.21 sep=2.62".
The closest Genie source has ra= 296.5847 dec= -39.3844 mag=18.93 sep=88.26".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 250 seconds with the U filter starting
278 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 19:46:26.90 = 296.61208
DEC(J2000) = -39:23:51.6 = -39.39766
with a 90%-confidence error radius of about 1.10 arc sec. This position is 2.62
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.21 with a 1-sigma error of about 0.35. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.081.
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?
639846656 277 U 296.61208 -39.39766 18.21/18.1 2.6 srclist Yes
639846656 277 U image found no candidates.
List afterglow candidates for other finding charts.
639846444 65 WHITE 296.61178 -39.39774 17.99/19.2 1.7 srclist Yes
639846444 65 WHITE image found no candidates.
639847235 856 WHITE 296.61160 -39.39793 18.58/19.2 3.0 srclist Yes
639847235 856 ? image data are not available.
------- Tokens for Quick GCN -------