image overlap message for exposure 2 of trigger 1031636
uvot_overlap.pl vrs. 2010-12-20b fem started at 210210d01h27m14s931515usUT
The observation of trigger 1031636 started 2021-02-09T21:44:55.7
Examining file ./1031636_g310_uvot_sky_image.fits
The exposure ID is 634599895
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (328.1247,43.5528) with a roll angle of 185.0
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 (328.0960,43.5590) with a radius of 3.000 arc min
This is 1.304 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 7.15 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (328.1223,43.5570) with a radius of 0.025 arc min
This is 0.272 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 1031636
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210210d01h27m31s331160usUT
Observation start time is 2021-02-09T21:44:55.7
Examining file ./1031636_g310_uvot_catalog_image.fits
The exposure ID is 634599895
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 16 detected source(s) for 1031636_g310
Aspect correction adds -0.00150 degrees (-0.360 sec of time = -3.91 arc sec) to RA
Aspect correction adds -0.00079 degrees (-2.85 arcsec) to Dec
Total aspect correction is 4.84 arcsec
Star catalogs centered at 328.1276 , 43.5480 with radius 2.59 arc min.
n_usno: 285 n_gsc: 0
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 10.77026
RA DEC Mag Color
bright star 0: 328.13112 (21:52:31.47) 43.53654 (+43:32:11.5) 10.77 USNO-V
bright star 1: 328.15750 (21:52:37.80) 43.55391 (+43:33:14.1) 11.40 USNO-V
bright star 2: 328.17615 (21:52:42.28) 43.53144 (+43:31:53.2) 11.10 USNO-V
Mean distance difference (CAT_DELTA) for 15 matched entries is 0.605" for 1031636_g310
Mean and std. dev of mag. difference (MAG_DELTA) are 1.101 and 1.459 for 1031636_g310
Found 2 entries without IDs and 0 entries that are acceptable afterglow candidates for 1031636_g310.
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.
2 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=328.0960 (21:52:23.04) DEC=43.5590 (+43:33:32.4)
XRT distances are from RA=328.1223 (21:52:29.34) DEC=43.5570 (+43:33:25.1)
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 8:
ra=328.13181 dec= 43.54060 +/- 0.6" mag=14.98+/-0.14 dist=64.0 REFID=12 flag=3
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 43841.281 counts in the bkg source region of 5914.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.413 counts/pixel (5-sig UL in 4" is 19.38 mag) for 1031636_g310
There are 1362.4536 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 6.881 counts/pixel for 1031636_g310
There are 8035.3389 counts in the xrt_bkg source region of 1133.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 7.092 counts/pixel (5-sig UL in 4" is 19.40 mag) for 1031636_g310
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 19.93, 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: 1031636_634599895_210210d01h27m31s331160usUT_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(328.1247,43.5528,45")
fk5;-circle(328.123790668194,43.560470951623,6")
fk5;-circle(328.13037540574,43.5541801864221,6")
fk5;-circle(328.134246774385,43.5507115868714,6")
fk5;-circle(328.106424630435,43.5544697707508,6")
fk5;-circle(328.141062263683,43.5462026085426,6")
fk5;-circle(328.131805254468,43.5405988562595,6")
Region file: 1031636_634599895_210210d01h27m31s331160usUT_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(328.12225,43.55697,8")
Region file: 1031636_634599895_210210d01h27m31s331160usUT_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(328.12225,43.55697,25")
fk5;-circle(328.12225,43.55697,15")
fk5;-circle(328.123790668194,43.560470951623,6")
fk5;-circle(328.13037540574,43.5541801864221,6")
image paragraph message for exposure 2 of trigger 1031636
------ Start for Possible Stand-alone Circular ----
In response to GRB210209 (Swift/BAT trigger 1031636) at 21:39:44 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
284 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
0.286.
------- notes for trigger 1031636 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210210d01h27m36s405566usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1031636
-expid=634599895 -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/1031636/
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 634599895.74552 or about 2021:040:21:44:50 UT
Found 1633 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 29% of the srclist region. Found 175 sources in
srclist catalog. Found 28 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 16 source(s) in Genie image catalog. Found 2 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.93 mag. Found 281 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
29% of the Genie image region.
Genie image analysis:
Found 43841.3 counts in the large background region of 5914.0 pixels or a rate
of 7.413 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 19.23 mag. for a
4-arcsec aperture.
Found 1362.5 counts in the XRT position region of 198.0 pixels or a rate of
6.881 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.167 +/- 0.160 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.481 cps or 18.99 mag. The closest srclist
source has ra= 328.1305 dec= 43.5541 mag=17.53 sep=23.76". The closest Genie
source has ra= 328.1238 dec= 43.5605 mag=18.62 sep=13.23".
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?
634599895 284 U srclist found no candidates.
634599895 284 U image found no candidates.
List afterglow candidates for other finding charts.
634599737 126 WHITE srclist found no candidates.
634599737 126 WHITE image found no candidates.
634600473 862 WHITE srclist found no candidates.
634600473 862 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 43.55697
GRB_ERROR: 5
GRB_RA: 328.12225
IMAGE_START_TIME: 21:44:50
MAGNITUDE: 19.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT