image overlap message for exposure 2 of trigger 952791
uvot_overlap.pl vrs. 2010-12-20b fem started at 200128d00h03m27s563293usUT
The observation of trigger 952791 started 2020-01-27T14:50:05.3
Examining file ./952791_g333_uvot_sky_image.fits
The exposure ID is 601829405
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (295.1995,44.8990) 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 0.686 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 (295.1930,44.9003) with a radius of 0.023 arc min
This is 0.288 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 0.002 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 952791
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200128d00h03m39s816783usUT
Observation start time is 2020-01-27T14:50:05.3
Examining file ./952791_g333_uvot_catalog_image.fits
The exposure ID is 601829405
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 23 detected source(s) for 952791_g333
Aspect correction adds -0.00046 degrees (-0.109 sec of time = -1.16 arc sec) to RA
Aspect correction adds -0.00104 degrees (-3.74 arcsec) to Dec
Total aspect correction is 3.91 arcsec
Star catalogs centered at 295.2023 , 44.8977 with radius 2.53 arc min.
n_usno: 239 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 23 matched entries is 0.452" for 952791_g333
Mean and std. dev of mag. difference (MAG_DELTA) are 0.908 and 0.498 for 952791_g333
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 952791_g333.
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)
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:
Matched source ra=295.18960 (19:40:45.50) dec=44.90062 (+44:54:02.2) +/- 0.7" mag=18.92+/-0.19 dist=8.8 REFID=13 flag=0
There are 31577.053 counts in the bkg source region of 5347.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.906 counts/pixel (5-sig UL in 4" is 19.50 mag) for 952791_g333
There are 1192.9271 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 6.025 counts/pixel for 952791_g333
There are 6243.6196 counts in the xrt_bkg source region of 1048.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 5.958 counts/pixel (5-sig UL in 4" is 19.50 mag) for 952791_g333
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 20.06, 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_601829405_200128d00h03m39s816783usUT_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(295.1995,44.8990,45")
fk5;-circle(295.203704709391,44.9035465619639,6")
fk5;-circle(295.19689575803,44.8967978170284,6")
fk5;-circle(295.189596726238,44.9006176879572,6")
fk5;-circle(295.193598337191,44.894682698311,6")
fk5;-circle(295.199451728422,44.9095588025028,6")
fk5;-circle(295.201136534113,44.894796474461,6")
fk5;-circle(295.208250163374,44.9027677884588,6")
fk5;-circle(295.196022409552,44.9112290130414,6")
fk5;-circle(295.209316048889,44.9068872185901,6")
fk5;-circle(295.218686706265,44.8991661297876,6")
Region file: 952791_601829405_200128d00h03m39s816783usUT_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_601829405_200128d00h03m39s816783usUT_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")
fk5;-circle(295.203704709391,44.9035465619639,6")
fk5;-circle(295.19689575803,44.8967978170284,6")
fk5;-circle(295.193598337191,44.894682698311,6")
fk5;-circle(295.201136534113,44.894796474461,6")
image paragraph message for exposure 2 of trigger 952791
SRCLIST PROBLEM: srclist filled telemetry buffer
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for 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 250 seconds with the U filter starting
309 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 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
0.16.
------- notes for trigger 952791 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200128d00h03m43s221701usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=952791
-expid=601829405 -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 601829405.29628 or about 2020:027:14:50:00 UT
Found 1400 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 72 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 23 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. 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
20.06 mag. Found 235 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 25% of the Genie image region.
Genie image analysis:
Found 31577.1 counts in the large background region of 5347.0 pixels or a rate
of 5.906 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 19.54 mag. for a
4-arcsec aperture.
Found 1192.9 counts in the XRT position region of 198.0 pixels or a rate of
6.025 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.053 +/- 0.151 (1-sigma) cps or
21.57 mag and a range from 20.11 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.505 cps or 19.12 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.30 mag. The closest
srclist source has ra= 295.2009 dec= 44.8946 mag=17.14 sep=28.59".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 295.1896 dec= 44.9006 mag=18.92 sep=8.76". The closest Genie
source has ra= 295.1896 dec= 44.9006 mag=18.92 sep=8.76".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the srclist data with mag < 17.56 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=295.18907
(19:40:45.38), DEC=44.86338 (+44:51:48.2) (J2000). It has a mag of 17.37. It is
172.7" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 250 seconds with the U filter starting
309 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 19:40:45.38 = 295.18907
DEC(J2000) = +44:51:48.2 = 44.86338
with a 90%-confidence error radius of about 1.10 arc sec. The estimated
magnitude is 17.37 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.
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
309 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 19:40:45.50 = 295.18960
DEC(J2000) = +44:54:02.2 = 44.90062
with a 90%-confidence error radius of about 0.72 arc sec. This position is 8.76
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.92 with a 1-sigma error of about 0.19. 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?
601829405 309 U srclist found no candidates.
601829405 309 U image found no candidates.
List afterglow candidates for other finding charts.
601829245 149 WHITE srclist found no candidates.
601829245 149 WHITE image found no candidates.
601829960 864 WHITE srclist found no candidates.
601829960 864 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 44.90028
GRB_ERROR: 5
GRB_RA: 295.19300
IMAGE_START_TIME: 14:50:00
MAGNITUDE: 19.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT