image overlap message for exposure 2 of trigger 969823
uvot_overlap.pl vrs. 2010-12-20b fem started at 200506d17h56m46s268537usUT
The observation of trigger 969823 started 2020-05-06T17:41:52.4
Examining file 969823_g302_uvot_sky_image.fits
The exposure ID is 610479712
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (274.5029,-16.1512) with a roll angle of 81.7
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 (274.4980,-16.1520) with a radius of 3.000 arc min
This is 0.287 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 (274.5007,-16.1312) with a radius of 0.060 arc min
This is 1.205 arc min from the center of the uvot region
The area of the XRT error circle is 0.011 sq. arc min
The UVOT/XRT overlap is 0.011 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 969823
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200506d17h56m47s350657usUT
Observation start time is 2020-05-06T17:41:52.4
Examining file 969823_g302_uvot_catalog_image.fits
The exposure ID is 610479712
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 24 detected source(s) for 969823_g302
Aspect correction adds 0.00206 degrees (0.494 sec of time = 7.12 arc sec) to RA
Aspect correction adds -0.00087 degrees (-3.13 arcsec) to Dec
Total aspect correction is 7.78 arcsec
Star catalogs centered at 274.5037 , -16.1480 with radius 2.66 arc min.
n_usno: 343 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.60322
RA DEC Mag Color
bright star 0: 274.49509 (18:17:58.82) -16.11858 (-16:07:06.9) 10.60 USNO-V
Mean distance difference (CAT_DELTA) for 15 matched entries is 0.372" for 969823_g302
Mean and std. dev of mag. difference (MAG_DELTA) are 1.876 and 0.921 for 969823_g302
Found 9 entries without IDs and 8 entries that are acceptable afterglow candidates for 969823_g302.
Acceptable entries have no ID, XRT distances < 9", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
1 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=274.4980 (18:17:59.52) DEC=-16.1520 (-16:09:07.2)
XRT distances are from RA=274.5007 (18:18:00.18) DEC=-16.1312 (-16:07:52.3)
*** WARNING 37 per cent of entries have no IDs.
-----------------
Entry 5 in the list of sources is a candidate afterglow for 969823_g302 with genie
ra=274.48869 (18:17:57.28) dec=-16.16319 (-16:09:47.5) +/- 0.7" mag=18.38+/-0.18
dist=122.5 REFID=16 major=4.9 minor=3.4 flag=1 (neighbor)
*** The position of this source is inconsistent with the XRT position.
The position is 51.6 arc sec from the BAT position.
Found 4 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
274.4929 -16.1596 19.5 -1 USNO-B1 18.05 15.94 16.88
274.4911 -16.1601 14.0 -1 USNO-B1 20.43 17.43 18.76
274.4847 -16.1615 15.1 -1 USNO-B1 18.66 16.34 17.37
274.4853 -16.1644 12.6 -1 USNO-B1 12.93 12.16 12.50
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 4.9
-----------------
Entry 6 in the list of sources is a candidate afterglow for 969823_g302 with genie
ra=274.49062 (18:17:57.75) dec=-16.16565 (-16:09:56.3) +/- 1.2" mag=19.86+/-0.36
dist=128.9 REFID=22 major=2.0 minor=1.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 55.3 arc sec from the BAT position.
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
274.4853 -16.1644 19.1 -1 USNO-B1 12.93 12.16 12.50
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.0
-----------------
Entry 9 in the list of sources is a candidate afterglow for 969823_g302 with genie
ra=274.48912 (18:17:57.39) dec=-16.16535 (-16:09:55.3) +/- 0.7" mag=18.04+/-0.16
dist=129.4 REFID=20 major=4.6 minor=3.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 57.0 arc sec from the BAT position.
Found 2 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
274.4853 -16.1644 13.8 -1 USNO-B1 12.93 12.16 12.50
274.4837 -16.1670 19.5 -1 USNO-B1 19.97 16.88 18.25
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 4.6
-----------------
Entry 15 in the list of sources is a candidate afterglow for 969823_g302 with genie
ra=274.48647 (18:17:56.75) dec=-16.16777 (-16:10:04.0) +/- 0.7" mag=18.20+/-0.17
dist=140.6 REFID=24 major=2.5 minor=1.3 flag=2 (blended)
*** The position of this source is inconsistent with the XRT position.
The position is 69.4 arc sec from the BAT position.
This source is near the edge of image (0.949)
Found 3 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
274.4853 -16.1644 12.9 -1 USNO-B1 12.93 12.16 12.50
274.4837 -16.1670 9.9 -1 USNO-B1 19.97 16.88 18.25
274.4856 -16.1730 18.9 -1 USNO-B1 19.58 16.34 17.78
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.5
-----------------
Entry 17 in the list of sources is a candidate afterglow for 969823_g302 with genie
ra=274.48121 (18:17:55.49) dec=-16.16485 (-16:09:53.5) +/- 0.6" mag=16.91+/-0.15
dist=138.7 REFID=23 major=2.7 minor=2.4 flag=2 (blended)
*** The position of this source is inconsistent with the XRT position.
The position is 74.2 arc sec from the BAT position.
This source is near the edge of image (0.905)
Found 3 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
274.4847 -16.1615 17.2 -1 USNO-B1 18.66 16.34 17.37
274.4853 -16.1644 14.1 -1 USNO-B1 12.93 12.16 12.50
274.4837 -16.1670 11.5 -1 USNO-B1 19.97 16.88 18.25
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.7
-----------------
Entry 18 in the list of sources is a candidate afterglow for 969823_g302 with genie
ra=274.48117 (18:17:55.48) dec=-16.16514 (-16:09:54.5) +/- 0.6" mag=17.18+/-0.15
dist=139.7 REFID=18 major=3.5 minor=2.6 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 75.0 arc sec from the BAT position.
This source is near the edge of image (0.917)
Found 3 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
274.4847 -16.1615 18.0 -1 USNO-B1 18.66 16.34 17.37
274.4853 -16.1644 14.4 -1 USNO-B1 12.93 12.16 12.50
274.4837 -16.1670 11.0 -1 USNO-B1 19.97 16.88 18.25
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 3.5
-----------------
Entry 20 in the list of sources is a candidate afterglow for 969823_g302 with genie
ra=274.49112 (18:17:57.87) dec=-16.12814 (-16:07:41.3) +/- 0.7" mag=18.20+/-0.17
dist=35.1 REFID=2 major=2.3 minor=0.8 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 89.1 arc sec from the BAT position.
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
274.4953 -16.1305 16.6 -1 USNO-B1 19.86 17.10 18.32
274.4902 -16.1290 4.4 -1 USNO-B1 19.90 17.57 18.60
274.4918 -16.1268 5.2 -1 USNO-B1 19.31 17.34 18.22
274.4858 -16.1303 20.0 -1 USNO-B1 19.41 16.25 17.65
274.4868 -16.1248 19.1 -1 USNO-B1 99.99 17.72 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.3
-----------------
Entry 21 in the list of sources is a candidate afterglow for 969823_g302 with genie
ra=274.52083 (18:18:05.00) dec=-16.16591 (-16:09:57.3) +/- 0.7" mag=18.12+/-0.17
dist=143.0 REFID=21 major=1.1 minor=0.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 93.5 arc sec from the BAT position.
This source is near the edge of image (0.944)
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
274.5204 -16.1620 14.0 -1 USNO-B1 19.21 15.55 17.18
274.5216 -16.1661 2.9 -1 USNO-B1 14.97 13.09 13.93 *
274.5250 -16.1646 15.3 -1 USNO-B1 18.68 99.99 99.99
274.5204 -16.1701 15.2 -1 USNO-B1 20.09 14.53 17.00
274.5256 -16.1655 16.5 -1 USNO-B1 16.56 13.91 15.09
274.5213 -16.1696 13.3 -1 USNO-B1 17.34 14.08 15.53
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" 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
274.5027 -16.1330 9.4 -1 USNO-B1 19.41 17.21 18.19
274.4995 -16.1332 8.3 -1 USNO-B1 19.68 16.75 18.05
The closest star is 8.28" away.
List UVOT sources within 10" of the XRT position:
There are 67738.070 counts in the bkg source region of 6008.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 11.275 counts/pixel (5-sig UL in 4" is 19.15 mag) for 969823_g302
There are 2365.6064 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 11.828 counts/pixel for 969823_g302
XRT source is too far (72.4186248794104") from center -- do not compute local background.
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 19.70, XRT distances < 9",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 969823_610479712_200506d17h56m47s350657usUT_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(274.5029,-16.1512,45")
fk5;-circle(274.493012946511,-16.1596147831164,6")
fk5;-circle(274.495828695445,-16.1429368951205,6")
fk5;-circle(274.499293532138,-16.1424171874838,6")
fk5;-circle(274.512686876134,-16.1422827441401,6")
Region file: 969823_610479712_200506d17h56m47s350657usUT_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(274.50075,-16.13119,8")
image paragraph message for exposure 2 of trigger 969823
SRCLIST PROBLEM: srclist filled telemetry buffer
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB200506 (Swift/BAT trigger 969823) at 17:36:49 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
277 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. The limiting magnitude for the list of sources is expected to be
about 17.7. No correction has been made for the large, but uncertain,
extinction expected.
------- notes for trigger 969823 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200506d17h56m49s088900usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=969823
-expid=610479712 -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/969823/
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 610479712.41248 or about 2020:127:17:41:47 UT
Found 3996 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 32% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 33 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 24 source(s) in Genie image catalog. Found 9 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.70 mag. Found 339 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
33% of the Genie image region.
Genie image analysis:
Found 67738.1 counts in the large background region of 6008.0 pixels or a rate
of 11.275 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 19.19 mag. for a
4-arcsec aperture.
Found 2365.6 counts in the XRT position region of 200.0 pixels or a rate of
11.828 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is 0.443 +/- 0.198 (1-sigma) cps or
19.26 mag and a range from 18.86 to 19.91 mag. The 3-sigma UL at the XRT
position is 1.036 cps or 18.34 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 17.83 mag. The closest
srclist source has ra= 274.5011 dec= -16.1341 mag=17.40 sep=10.72". The closest
Genie source has ra= 274.5013 dec= -16.1345 mag=16.66 sep=12.00".
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?
610479712 277 U srclist found no candidates.
610479712 277 U image found no candidates.
List afterglow candidates for other finding charts.
610479500 65 WHITE srclist found no candidates.
610479500 65 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -16.13119
GRB_ERROR: 9
GRB_RA: 274.50075
IMAGE_START_TIME: 17:41:47
MAGNITUDE: 18.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT