image overlap message for exposure 3 of trigger 1070298
uvot_overlap.pl vrs. 2010-12-20b fem started at 210825d07h16m48s157911usUT
The observation of trigger 1070298 started 2021-08-25T07:08:33.8
Examining file ./1070298_g905_uvot_sky_image.fits
The exposure ID is 651568113
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (238.8233,-54.0701) with a roll angle of 280.7
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 (238.8360,-54.0700) with a radius of 3.000 arc min
This is 0.448 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 (238.7856,-54.0615) with a radius of 0.032 arc min
This is 1.424 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 0.001 sq. arc min or 0.19 of the XRT error circle
image afterglow message for exposure 3 of trigger 1070298
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210825d07h17m14s388002usUT
Observation start time is 2021-08-25T07:08:33.8
Examining file ./1070298_g905_uvot_catalog_image.fits
The exposure ID is 651568113
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 47 detected source(s) for 1070298_g905
Aspect correction adds -0.00459 degrees (-1.101 sec of time = -9.69 arc sec) to RA
Aspect correction adds -0.00028 degrees (-1.00 arcsec) to Dec
Total aspect correction is 9.74 arcsec
Star catalogs centered at 238.8222 , -54.0708 with radius 2.72 arc min.
n_usno: 445 n_gsc: 0
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 10.71494
RA DEC Mag Color
bright star 0: 238.80655 (15:55:13.57) -54.06409 (-54:03:50.7) 11.70 USNO-R
bright star 1: 238.79818 (15:55:11.56) -54.07666 (-54:04:36.0) 10.71 USNO-V
bright star 2: 238.85814 (15:55:25.95) -54.07434 (-54:04:27.6) 11.40 USNO-V
Mean distance difference (CAT_DELTA) for 42 matched entries is 0.656" for 1070298_g905
Mean and std. dev of mag. difference (MAG_DELTA) are 1.509 and 0.546 for 1070298_g905
Found 6 entries without IDs and 2 entries that are acceptable afterglow candidates for 1070298_g905.
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.
4 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=238.8360 (15:55:20.64) DEC=-54.0700 (-54:04:12.0)
XRT distances are from RA=238.7856 (15:55:08.54) DEC=-54.0615 (-54:03:41.4)
-----------------
Entry 5 in the list of sources is a candidate afterglow for 1070298_g905 with genie
ra=238.84726 (15:55:23.34) dec=-54.06626 (-54:03:58.5) +/- 0.6" mag=17.47+/-0.14
dist=131.4 REFID=17 major=0.9 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 27.3 arc sec from the BAT position.
Found 10 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
238.8399 -54.0656 15.7 -1 USNO-B1 99.99 19.02 99.99
238.8421 -54.0651 11.7 -1 USNO-B1 19.54 18.00 18.68
238.8456 -54.0702 14.6 -1 USNO-B1 19.24 18.55 18.85
238.8453 -54.0683 8.4 -1 USNO-B1 19.47 18.55 18.96
238.8478 -54.0664 1.2 -1 USNO-B1 16.94 15.84 16.33 *
238.8486 -54.0684 8.3 -1 USNO-B1 16.53 15.32 15.86
238.8518 -54.0677 11.0 -1 USNO-B1 19.09 17.89 18.42
238.8519 -54.0652 10.5 -1 USNO-B1 17.48 16.07 16.70
238.8528 -54.0647 12.9 -1 USNO-B1 17.21 15.88 16.47
238.8545 -54.0695 19.2 -1 USNO-B1 20.27 18.89 19.50
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 8 in the list of sources is a candidate afterglow for 1070298_g905 with genie
ra=238.85084 (15:55:24.20) dec=-54.06554 (-54:03:55.9) +/- 0.7" mag=19.07+/-0.16
dist=138.6 REFID=16 major=0.9 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 35.2 arc sec from the BAT position.
Found 8 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
238.8421 -54.0651 18.6 -1 USNO-B1 19.54 18.00 18.68
238.8453 -54.0683 15.3 -1 USNO-B1 19.47 18.55 18.96
238.8478 -54.0664 7.3 -1 USNO-B1 16.94 15.84 16.33
238.8486 -54.0684 11.4 -1 USNO-B1 16.53 15.32 15.86
238.8518 -54.0677 8.1 -1 USNO-B1 19.09 17.89 18.42
238.8519 -54.0652 2.6 -1 USNO-B1 17.48 16.07 16.70 *
238.8528 -54.0647 5.1 -1 USNO-B1 17.21 15.88 16.47
238.8545 -54.0695 16.1 -1 USNO-B1 20.27 18.89 19.50
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 1 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
238.7890 -54.0616 7.2 -1 USNO-B1 18.27 17.10 17.62
The closest star is 7.18" away.
List UVOT sources within 10" of the XRT position:
There are 89728.602 counts in the bkg source region of 5180.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 17.322 counts/pixel (5-sig UL in 4" is 19.80 mag) for 1070298_g905
Do not compute counts in XRT region because position is too far from center.
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 20.36, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1070298_651568113_210825d07h17m14s388002usUT_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(238.8233,-54.0701,45")
fk5;-circle(238.834641429014,-54.0677115548283,6")
fk5;-circle(238.840553654273,-54.0706504367147,6")
fk5;-circle(238.83559644431,-54.073719795469,6")
fk5;-circle(238.83389994191,-54.0749151794884,6")
fk5;-circle(238.833563241011,-54.0647180384232,6")
fk5;-circle(238.841915318162,-54.0776737544433,6")
fk5;-circle(238.82170265595,-54.0766688846298,6")
fk5;-circle(238.826584807573,-54.0809334376165,6")
fk5;-circle(238.80808356337,-54.0706093074235,6")
fk5;-circle(238.80761948367,-54.0665195736519,6")
fk5;-circle(238.807192066344,-54.0770665819625,6")
fk5;-circle(238.806221286796,-54.0639251636494,6")
image paragraph message for exposure 3 of trigger 1070298
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: high density of stars, partial overlap
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB210825 (Swift/BAT trigger 1070298) at 06:53:27 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 878 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 19% 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
sub-image. The 8'x8' region for the list of sources generated on-board covers
0.00% of the XRT error circle. No correction has been made for the large, but
uncertain, extinction expected.
------- notes for trigger 1070298 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210825d07h17m19s166240usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1070298
-expid=651568113 -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/1070298/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for bat position. Unreliable extinction found for
xrt position. XRT position found for srclist. XRT position found for Genie
image. BAT position found.
UVOT exposure began at MET 651568113.82542 or about 2021:237:07:08:28 UT
Found 3116 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 36% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 20 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 47 source(s) in Genie image catalog. Found 6 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.36 mag. Found 441 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
41% of the Genie image region.
Genie image analysis:
Found 89728.6 counts in the large background region of 5180.0 pixels or a rate
of 17.322 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 19.62 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 18.79 mag. The closest srclist
source has ra= 238.7816 dec= -54.0691 mag=18.10 sep=28.54". The closest Genie
source has ra= 238.7815 dec= -54.0693 mag=17.82 sep=29.30".
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?
651568113 878 WHITE srclist found no candidates.
651568113 878 WHITE image found no candidates.
List afterglow candidates for other finding charts.
651567320 85 WHITE srclist found no candidates.
651567320 85 WHITE image found no candidates.
651567532 297 U srclist found no candidates.
651567532 297 U image found no candidates.
------- Tokens for Quick GCN -------