image overlap message for exposure 3 of trigger 1031636
uvot_overlap.pl vrs. 2010-12-20b fem started at 210210d01h27m15s810834usUT
The observation of trigger 1031636 started 2021-02-09T21:54:33.0
Examining file ./1031636_g888_uvot_sky_image.fits
The exposure ID is 634600473
The exposure time is 89.965 (seconds)
The filter is WHITE.
The uvot region is centered at (328.1241,43.5521) 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 1.289 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 7.16 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 0.302 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 3 of trigger 1031636
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210210d01h27m43s202520usUT
Observation start time is 2021-02-09T21:54:33.0
Examining file ./1031636_g888_uvot_catalog_image.fits
The exposure ID is 634600473
The exposure is 89.965 sec.
The bin size is 2 pixels
The filter is WHITE
There are 24 detected source(s) for 1031636_g888
Aspect correction adds -0.00174 degrees (-0.417 sec of time = -4.53 arc sec) to RA
Aspect correction adds -0.00067 degrees (-2.43 arcsec) to Dec
Total aspect correction is 5.14 arcsec
Star catalogs centered at 328.1273 , 43.5478 with radius 2.60 arc min.
n_usno: 287 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 20 matched entries is 0.602" for 1031636_g888
Mean and std. dev of mag. difference (MAG_DELTA) are 0.986 and 0.972 for 1031636_g888
Found 6 entries without IDs and 2 entries that are acceptable afterglow candidates for 1031636_g888.
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=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)
-----------------
Entry 22 in the list of sources is a candidate afterglow for 1031636_g888 with genie
ra=328.13191 (21:52:31.66) dec=43.52680 (+43:31:36.5) +/- 0.7" mag=19.12+/-0.19
dist=111.5 REFID=23 major=1.5 minor=0.6 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 149.1 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
328.1263 43.5288 16.4 -1 USNO-B1 20.21 18.25 19.12
328.1265 43.5253 15.1 -1 USNO-B1 18.05 17.06 17.50
328.1296 43.5242 11.2 -1 USNO-B1 15.56 15.06 15.28
328.1275 43.5233 17.1 -1 USNO-B1 18.73 17.00 17.77
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 25 in the list of sources is a candidate afterglow for 1031636_g888 with genie
ra=328.12775 (21:52:30.66) dec=43.52396 (+43:31:26.3) +/- 0.6" mag=17.09+/-0.14
dist=119.7 REFID=16 major=2.7 minor=0.8 flag=18 (blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 150.9 arc sec from the BAT position.
This source is near the edge of image (0.971)
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
328.1263 43.5288 17.9 -1 USNO-B1 20.21 18.25 19.12
328.1265 43.5253 5.9 -1 USNO-B1 18.05 17.06 17.50
328.1296 43.5242 5.0 -1 USNO-B1 15.56 15.06 15.28 *
328.1275 43.5233 2.6 -1 USNO-B1 18.73 17.00 17.77 *
328.1209 43.5226 18.5 -1 USNO-B1 16.56 15.50 15.98
328.1275 43.5199 14.7 -1 USNO-B1 17.03 15.89 16.40
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 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 1.0402856E+05 counts in the bkg source region of 5927.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 17.552 counts/pixel (5-sig UL in 4" is 19.24 mag) for 1031636_g888
There are 3359.4587 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 16.797 counts/pixel for 1031636_g888
There are 19579.686 counts in the xrt_bkg source region of 1135.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 17.251 counts/pixel (5-sig UL in 4" is 19.25 mag) for 1031636_g888
There are 1 candidate(s) outside XRT error circle with mag < 19.23
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.79, 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_634600473_210210d01h27m43s202520usUT_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(328.1241,43.5521,45")
fk5;-circle(328.123696612356,43.5605373713072,6")
fk5;-circle(328.130373889881,43.5542610441122,6")
fk5;-circle(328.134282001755,43.5507984987709,6")
fk5;-circle(328.106357359517,43.5545249213618,6")
fk5;-circle(328.141026970214,43.5462605179473,6")
Region file: 1031636_634600473_210210d01h27m43s202520usUT_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_634600473_210210d01h27m43s202520usUT_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(328.123696612356,43.5605373713072,6")
fk5;-circle(328.130373889881,43.5542610441122,6")
image paragraph message for exposure 3 of trigger 1031636
SRCLIST PROBLEM: srclist filled telemetry buffer
------ 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 90 seconds with the White filter
starting 862 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 19.6 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 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 210210d01h27m47s970531usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1031636
-expid=634600473 -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 634600473.00996 or about 2021:040:21:54:28 UT
Found 3399 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 28% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 7 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.94 mag.
Found 24 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 19.79 mag. Found 283 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 104028.6 counts in the large background region of 5927.0 pixels or a rate
of 17.552 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 19.06 mag. for a
4-arcsec aperture.
Found 3359.5 counts in the XRT position region of 200.0 pixels or a rate of
16.797 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -1.007 +/- 0.700 (1-sigma) cps. The
3-sigma UL at the XRT position is 2.100 cps or 18.79 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 18.62
mag. The closest srclist source has ra= 328.1304 dec= 43.5543 mag=16.60
sep=23.34". The closest Genie source has ra= 328.1237 dec= 43.5605 mag=18.20
sep=13.39".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the image data with mag < 19.23 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=328.13191
(21:52:31.66), DEC=43.52680 (+43:31:36.5) (J2000). It has a mag of 19.12. It is
149.1" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 90 seconds with the White filter
starting 862 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 21:52:31.66 = 328.13191
DEC(J2000) = +43:31:36.5 = 43.52680
with a 90%-confidence error radius of about 0.72 arc sec. The estimated
magnitude is 19.12 with a 1-sigma error of about 0.19. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.286.
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?
634600473 862 WHITE srclist found no candidates.
634600473 862 WHITE 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.
634599895 284 U srclist found no candidates.
634599895 284 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 43.55697
GRB_ERROR: 5
GRB_RA: 328.12225
IMAGE_START_TIME: 21:54:28
MAGNITUDE: 18.8
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT