image overlap message for exposure 3 of trigger 1090472
uvot_overlap.pl vrs. 2010-12-20b fem started at 211222d01h31m11s893590usUT
The observation of trigger 1090472 started 2021-12-21T21:03:46.9
Examining file ./1090472_g905_uvot_sky_image.fits
The exposure ID is 661813426
The exposure time is 132.568 (seconds)
The filter is WHITE.
The uvot region is centered at (78.8963,0.9086) 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 3.128 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 2.97 sq. arc min or 0.10 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 0.358 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 3 of trigger 1090472
find_uvot_ag.pl vrs. 2020-10-30 fem started at 211222d01h31m38s032261usUT
Observation start time is 2021-12-21T21:03:46.9
Examining file ./1090472_g905_uvot_catalog_image.fits
The exposure ID is 661813426
The exposure is 132.568 sec.
The bin size is 2 pixels
The filter is WHITE
There are 11 detected source(s) for 1090472_g905
Aspect correction adds -0.00089 degrees (-0.215 sec of time = -3.22 arc sec) to RA
Aspect correction adds -0.00110 degrees (-3.97 arcsec) to Dec
Total aspect correction is 5.11 arcsec
Star catalogs centered at 78.8938 , 0.9058 with radius 2.27 arc min.
n_usno: 58 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 8 matched entries is 0.471" for 1090472_g905
Mean and std. dev of mag. difference (MAG_DELTA) are 1.014 and 0.229 for 1090472_g905
Found 3 entries without IDs and 0 entries that are acceptable afterglow candidates for 1090472_g905.
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 27 per cent of entries have no IDs.
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 7:
ra= 78.88923 dec= 0.89110 +/- 0.6" mag=16.14+/-0.14 dist=89.3 REFID=2 flag=18
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 53936.258 counts in the bkg source region of 6092.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 8.854 counts/pixel (5-sig UL in 4" is 20.03 mag) for 1090472_g905
There are 1864.5474 counts in the xrt source region of 208.00000 pixels.
Rate in xrt region with 8 arcsec radius is 8.964 counts/pixel for 1090472_g905
There are 10834.581 counts in the xrt_bkg source region of 1245.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 8.702 counts/pixel (5-sig UL in 4" is 20.04 mag) for 1090472_g905
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 20.59, 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_661813426_211222d01h31m38s032261usUT_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(78.8963,0.9086,45")
fk5;-circle(78.9031044498226,0.908373806523715,6")
fk5;-circle(78.9064075346443,0.912351761889617,6")
Region file: 1090472_661813426_211222d01h31m38s032261usUT_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_661813426_211222d01h31m38s032261usUT_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(78.9031044498226,0.908373806523715,6")
image paragraph message for exposure 3 of trigger 1090472
SRCLIST PROBLEM: srclist filled telemetry buffer
------ 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 133 seconds with the White filter
starting 877 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
0.143.
------- notes for trigger 1090472 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 211222d01h31m43s606551usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1090472
-expid=661813426 -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 661813426.85728 or about 2021:355:21:03:41 UT
Found 683 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 79 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 19.15 mag.
Found 11 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 20.59 mag. Found 54 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 53936.3 counts in the large background region of 6092.0 pixels or a rate
of 8.854 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 19.86 mag. for a
4-arcsec aperture.
Found 1864.5 counts in the XRT position region of 208.0 pixels or a rate of
8.964 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.409 +/- 0.350 (1-sigma) cps or
20.58 mag and a range from 19.90 to 22.68 mag. The 3-sigma UL at the XRT
position is 1.459 cps or 19.19 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 19.51 mag. The closest
srclist source has ra= 78.9033 dec= 0.9083 mag=18.79 sep=30.67". The closest
Genie source has ra= 78.9031 dec= 0.9084 mag=18.43 sep=29.99".
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?
661813426 876 WHITE srclist found no candidates.
661813426 876 WHITE 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.
661812824 274 U srclist found no candidates.
661812824 274 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 0.91450
GRB_ERROR: 5.5
GRB_RA: 78.89746
IMAGE_START_TIME: 21:03:41
MAGNITUDE: 19.2
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT