image overlap message for exposure 2 of trigger 1090472
uvot_overlap.pl vrs. 2010-12-20b fem started at 211222d01h31m11s302693usUT
The observation of trigger 1090472 started 2021-12-21T20:53:44.5
Examining file ./1090472_g303_uvot_sky_image.fits
The exposure ID is 661812824
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (78.8970,0.9094) with a roll angle of 205.2
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 (78.9380,0.9400) with a radius of 3.000 arc min
This is 3.067 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 3.13 sq. arc min or 0.11 of the BAT error circle
The XRT error circle is centered at (78.8975,0.9145) with a radius of 0.037 arc min
This is 0.305 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1090472
find_uvot_ag.pl vrs. 2020-10-30 fem started at 211222d01h31m26s423828usUT
Observation start time is 2021-12-21T20:53:44.5
Examining file ./1090472_g303_uvot_catalog_image.fits
The exposure ID is 661812824
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 12 detected source(s) for 1090472_g303
Aspect correction adds -0.00087 degrees (-0.209 sec of time = -3.13 arc sec) to RA
Aspect correction adds -0.00049 degrees (-1.78 arcsec) to Dec
Total aspect correction is 3.60 arcsec
Star catalogs centered at 78.8981 , 0.9073 with radius 2.49 arc min.
n_usno: 69 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.420" for 1090472_g303
Mean and std. dev of mag. difference (MAG_DELTA) are 0.757 and 0.413 for 1090472_g303
Found 6 entries without IDs and 6 entries that are acceptable afterglow candidates for 1090472_g303.
Acceptable entries have no ID, XRT distances < 5.5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
Magnitude criteria will be applied later.
BAT distances are from RA=78.9380 (05:15:45.12) DEC= 0.9400 (+00:56:24.0)
XRT distances are from RA=78.8975 (05:15:35.39) DEC= 0.9145 (+00:54:52.2)
*** WARNING 50 per cent of entries have no IDs.
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1090472_g303 with genie
ra=78.90690 (05:15:37.66) dec=0.92275 (+00:55:21.9) +/- 0.8" mag=19.58+/-0.22
dist=45.1 REFID=4 major=3.3 minor=2.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 128.0 arc sec from the BAT position.
Found 1 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
78.9062 0.9222 3.1 -1 USNO-B1 18.29 17.30 17.73 *
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 2 in the list of sources is a candidate afterglow for 1090472_g303 with genie
ra=78.90975 (05:15:38.34) dec=0.91970 (+00:55:10.9) +/- 0.9" mag=19.80+/-0.24
dist=48.0 REFID=5 major=2.2 minor=1.3 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 125.2 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
78.9062 0.9222 15.6 -1 USNO-B1 18.29 17.30 17.73
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.2
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1090472_g303 with genie
ra=78.91084 (05:15:38.60) dec=0.91805 (+00:55:05.0) +/- 0.9" mag=19.80+/-0.24
dist=49.8 REFID=6 major=1.7 minor=1.4 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 125.7 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 1.7
-----------------
Entry 5 in the list of sources is a candidate afterglow for 1090472_g303 with genie
ra=78.90464 (05:15:37.11) dec=0.92711 (+00:55:37.6) +/- 0.8" mag=19.47+/-0.21
dist=52.2 REFID=2 major=2.6 minor=1.1 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 128.7 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
78.9062 0.9222 18.5 -1 USNO-B1 18.29 17.30 17.73
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.6
-----------------
Entry 7 in the list of sources is a candidate afterglow for 1090472_g303 with genie
ra=78.91502 (05:15:39.61) dec=0.91248 (+00:54:44.9) +/- 0.7" mag=19.27+/-0.20
dist=63.6 REFID=10 major=2.2 minor=1.4 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 129.1 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.2
-----------------
Entry 10 in the list of sources is a candidate afterglow for 1090472_g303 with genie
ra=78.92237 (05:15:41.37) dec=0.90253 (+00:54:09.1) +/- 0.7" mag=18.99+/-0.18
dist=99.5 REFID=11 major=1.9 minor=1.5 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 146.2 arc sec from the BAT position.
This source is near the edge of image (0.913)
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 1.9
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 17776.889 counts in the bkg source region of 6197.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.869 counts/pixel (5-sig UL in 4" is 19.89 mag) for 1090472_g303
There are 565.29797 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.855 counts/pixel for 1090472_g303
There are 3645.1362 counts in the xrt_bkg source region of 1239.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.942 counts/pixel (5-sig UL in 4" is 19.88 mag) for 1090472_g303
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 20.45, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1090472_661812824_211222d01h31m26s423828usUT_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(78.8970,0.9094,45")
fk5;-circle(78.9031023143576,0.908345837912257,6")
Region file: 1090472_661812824_211222d01h31m26s423828usUT_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(78.89746,0.91450,8")
Region file: 1090472_661812824_211222d01h31m26s423828usUT_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(78.89746,0.91450,25")
fk5;-circle(78.89746,0.91450,15")
fk5;-circle(78.9031023143576,0.908345837912257,6")
image paragraph message for exposure 2 of trigger 1090472
------ Start for Possible Stand-alone Circular ----
In response to GRB211221 (Swift/BAT trigger 1090472) at 20:48:40 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
275 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
0.143.
------- notes for trigger 1090472 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 211222d01h31m31s929694usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1090472
-expid=661812824 -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/1090472/
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 661812824.4599 or about 2021:355:20:53:39 UT
Found 350 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 141 sources in
srclist catalog. Found 90 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 12 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 20.45 mag. Found 65 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
7% of the Genie image region.
Genie image analysis:
Found 17776.9 counts in the large background region of 6197.0 pixels or a rate
of 2.869 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 19.73 mag. for a
4-arcsec aperture.
Found 565.3 counts in the XRT position region of 198.0 pixels or a rate of
2.855 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.069 +/- 0.103 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.308 cps or 19.46 mag. The closest srclist
source has ra= 78.8887 dec= 0.9242 mag=17.51 sep=46.96". The closest Genie
source has ra= 78.9031 dec= 0.9083 mag=18.53 sep=30.06".
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?
661812824 274 U srclist found no candidates.
661812824 274 U image found no candidates.
List afterglow candidates for other finding charts.
661812612 62 WHITE srclist found no candidates.
661812612 62 WHITE image found no candidates.
661813426 876 WHITE srclist found no candidates.
661813426 876 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 0.91450
GRB_ERROR: 5.5
GRB_RA: 78.89746
IMAGE_START_TIME: 20:53:39
MAGNITUDE: 19.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT