image overlap message for exposure 1 of trigger 952791
uvot_overlap.pl vrs. 2010-12-20b fem started at 200128d00h03m26s754903usUT
The observation of trigger 952791 started 2020-01-27T14:47:25.9
Examining file ./952791_g173_uvot_sky_image.fits
The exposure ID is 601829245
The exposure time is 149.879 (seconds)
The filter is WHITE.
*** Warning -- found 16720 null pixels in the image.
The uvot region is centered at (295.1978,44.8960) with a roll angle of 165.0
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 (295.2040,44.9100) with a radius of 3.000 arc min
This is 0.880 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 at most 5.69 sq. arc min or 0.20 of the BAT error circle
The XRT error circle is centered at (295.1930,44.9003) with a radius of 0.023 arc min
This is 0.327 arc min from the center of the uvot region
The area of the XRT error circle is 0.002 sq. arc min
The UVOT/XRT overlap is 0.00 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 952791
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200128d00h03m32s322614usUT
Observation start time is 2020-01-27T14:47:25.9
Examining file ./952791_g173_uvot_catalog_image.fits
The exposure ID is 601829245
The exposure is 149.879 sec.
The bin size is 2 pixels
The filter is WHITE
There are 18 detected source(s) for 952791_g173
Aspect correction adds 0.00012 degrees (0.029 sec of time = 0.31 arc sec) to RA
Aspect correction adds -0.00073 degrees (-2.62 arcsec) to Dec
Total aspect correction is 2.64 arcsec
Star catalogs centered at 295.2066 , 44.8943 with radius 2.80 arc min.
n_usno: 281 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.00116
RA DEC Mag Color
bright star 0: 295.16047 (19:40:38.51) 44.86912 (+44:52:08.8) 11.00 USNO-V
Mean distance difference (CAT_DELTA) for 15 matched entries is 0.497" for 952791_g173
Mean and std. dev of mag. difference (MAG_DELTA) are 0.825 and 0.501 for 952791_g173
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 952791_g173.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=295.2040 (19:40:48.96) DEC=44.9100 (+44:54:36.0)
XRT distances are from RA=295.1930 (19:40:46.32) DEC=44.9003 (+44:54:01.0)
-----------------
Entry 2 in the list of sources is a candidate afterglow for 952791_g173 with genie
ra=295.21948 (19:40:52.67) dec=44.90238 (+44:54:08.6) +/- 0.8" mag=20.06+/-0.21
dist=67.9 REFID=7 major=1.4 minor=1.4 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 46.0 arc sec from the BAT position.
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
295.2185 44.8990 12.3 -1 USNO-B1 18.56 17.08 17.74
295.2203 44.9025 2.2 -1 USNO-B1 19.73 18.98 19.31 *
295.2174 44.9057 13.2 -1 USNO-B1 20.33 19.61 19.93
295.2245 44.9016 13.0 -1 USNO-B1 13.73 13.00 13.32
295.2174 44.9073 18.5 -1 USNO-B1 18.60 16.86 17.63
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 952791_g173 with genie
ra=295.22706 (19:40:54.49) dec=44.90647 (+44:54:23.3) +/- 0.7" mag=19.12+/-0.16
dist=89.6 REFID=4 major=3.0 minor=2.1 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 57.7 arc sec from the BAT position.
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
295.2245 44.9016 18.7 -1 USNO-B1 13.73 13.00 13.32
295.2223 44.9095 16.3 -1 USNO-B1 18.93 17.53 18.15
295.2273 44.9073 3.0 -1 USNO-B1 20.12 18.71 19.34 *
295.2331 44.9056 15.7 -1 USNO-B1 17.87 16.53 17.12
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 14 in the list of sources is a candidate afterglow for 952791_g173 with genie
ra=295.20394 (19:40:48.95) dec=44.87268 (+44:52:21.7) +/- 0.7" mag=19.41+/-0.17
dist=103.2 REFID=18 major=0.5 minor=0.3 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 134.4 arc sec from the BAT position.
This source is near the edge of image (0.965)
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
295.2100 44.8736 15.8 -1 USNO-B1 19.68 18.49 19.02
295.2086 44.8732 11.9 -1 USNO-B1 19.13 18.54 18.80
295.2035 44.8722 2.1 -1 USNO-B1 16.93 15.68 16.23 *
295.1968 44.8706 19.7 -1 USNO-B1 20.33 19.13 19.66
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
295.1911 44.9018 7.4 -1 USNO-B1 20.30 19.72 19.98
295.1895 44.9007 8.9 -1 USNO-B1 18.74 17.23 17.91
The closest star is 7.41" away.
List UVOT sources within 10" of the XRT position:
There are 17668.607 counts in the bkg source region of 1034.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 17.088 counts/pixel (5-sig UL in 4" is 19.81 mag) for 952791_g173
There are 0.0000000 counts in the xrt source region of 0.0000000 pixels.
There are 0.0000000 counts in the xrt_bkg source region of 0.0000000 pixels.
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: 952791_601829245_200128d00h03m32s322614usUT_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(295.1978,44.8960,45")
Region file: 952791_601829245_200128d00h03m32s322614usUT_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(295.19300,44.90028,8")
Region file: 952791_601829245_200128d00h03m32s322614usUT_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(295.19300,44.90028,25")
fk5;-circle(295.19300,44.90028,15")
image paragraph message for exposure 1 of trigger 952791
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 GRB200127 (Swift/BAT trigger 952791) at 14:44:31 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 149 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 mag. No correction has been made for the expected
extinction corresponding to E(B-V) of 0.16.
------- notes for trigger 952791 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200128d00h03m35s728894usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=952791
-expid=601829245 -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/952791/
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 601829245.92578 or about 2020:027:14:47:20 UT
Found 1499 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 25% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 23 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 18 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 20.36 mag. Found 277 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
24% of the Genie image region. The Genie image is INCOMPLETE with 16720 null
pixels.
Genie image analysis:
Found 17668.6 counts in the large background region of 1034.0 pixels or a rate
of 17.088 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 19.81 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 19.15 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 295.1892 dec= 44.9005 mag=18.93 sep=9.66".
The closest srclist source has ra= 295.1892 dec= 44.9005 mag=18.93 sep=9.66".
The closest Genie source has ra= 295.2186 dec= 44.8990 mag=18.01 sep=65.50".
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 150 seconds with the White filter
starting 149 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 19:40:45.42 = 295.18923
DEC(J2000) = +44:54:01.9 = 44.90052
with a 90%-confidence error radius of about 1.10 arc sec. This position is 9.66
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.93 with a 1-sigma error of about 0.35. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.16.
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?
601829245 149 WHITE srclist found no candidates.
601829245 149 WHITE image found no candidates.
List afterglow candidates for other finding charts.
601829405 309 U srclist found no candidates.
601829405 309 U image found no candidates.
601829960 864 WHITE srclist found no candidates.
601829960 864 WHITE image found no candidates.
------- Tokens for Quick GCN -------