srclist overlap message for exposure 1 of trigger 1090472
uvot_overlap.pl vrs. 2010-12-20b fem started at 211222d01h31m09s414445usUT
The observation of trigger 1090472 started 2021-12-21T20:50:12.5
Examining file ./1090472_g91_uvot_sky_srclist.fits
The exposure ID is 661812612
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (78.9351,0.9354) with a roll angle of 205.2
It is square with sides of 8.03 arc min. for an area of 64.51 sq arc min
The BAT error circle is centered at (78.9380,0.9400) with a radius of 3.000 arc min
This is 0.326 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 28.27 sq. arc min or 1.00 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 2.585 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
srclist afterglow message for exposure 1 of trigger 1090472
find_uvot_ag.pl vrs. 2020-10-30 fem started at 211222d01h31m13s002559usUT
Observation start time is 2021-12-21T20:50:12.5
Examining file ./1090472_g91_uvot_catalog_srclist.fits
The exposure ID is 661812612
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 107 detected source(s) for 1090472_g91
Aspect correction adds -0.00106 degrees (-0.255 sec of time = -3.83 arc sec) to RA
Aspect correction adds -0.00101 degrees (-3.65 arcsec) to Dec
Total aspect correction is 5.29 arcsec
Star catalogs centered at 78.9274 , 0.9417 with radius 6.88 arc min.
n_usno: 463 n_gsc: 0
*** WARNING -- bright star catalog has 4 entries brighter than 12 mag
The brightest has mag 8.98824
RA DEC Mag Color
bright star 0: 78.94603 (05:15:47.05) 1.00402 (+01:00:14.5) 11.99 USNO-V
bright star 1: 78.84928 (05:15:23.83) 0.94641 (+00:56:47.1) 9.60 USNO-V
bright star 2: 78.84337 (05:15:22.41) 1.01342 (+01:00:48.3) 8.99 USNO-V
bright star 3: 78.88634 (05:15:32.72) 1.04687 (+01:02:48.7) 10.95 USNO-V
Mean distance difference (CAT_DELTA) for 72 matched entries is 0.794" for 1090472_g91
Mean and std. dev of mag. difference (MAG_DELTA) are 2.262 and 1.451 for 1090472_g91
Found 35 entries without IDs and 2 entries that are acceptable afterglow candidates for 1090472_g91.
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.
31 sources matched bright stars.
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 32 per cent of entries have no IDs.
-----------------
Entry 12 in the list of sources is a candidate afterglow for 1090472_g91 with 3x3 stamp
ra=78.92249 (05:15:41.40) dec=0.92751 (+00:55:39.0) +/- 1.1" mag=19.78+/-0.35
dist=101.5 REFID=94
*** The position of this source is inconsistent with the XRT position.
The position is 71.7 arc sec from the BAT position.
src: 12 distr. of nearby unmatched sources: 1 0 0 0 0
Found 5 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
78.9198 0.9312 16.5 -1 USNO-B1 20.58 18.32 19.32
78.9243 0.9278 6.7 -1 USNO-B1 15.56 14.44 14.94
78.9235 0.9278 3.9 -1 USNO-B1 16.75 16.02 16.34 *
78.9253 0.9254 12.7 -1 USNO-B1 20.49 99.99 99.99
78.9177 0.9282 17.3 -1 USNO-B1 17.41 16.68 17.00
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 94 in the list of sources is a candidate afterglow for 1090472_g91 with 3x3 stamp
ra=78.94638 (05:15:47.13) dec=0.99117 (+00:59:28.2) +/- 1.1" mag=18.82+/-0.35
dist=327.4 REFID=56
*** The position of this source is inconsistent with the XRT position.
The position is 186.7 arc sec from the BAT position.
src: 94 distr. of nearby unmatched sources: 0 0 0 0 0
Found 2 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
78.9463 0.9903 3.3 -1 USNO-B1 14.98 14.52 14.72 *
78.9504 0.9926 15.2 -1 USNO-B1 19.38 18.60 18.95
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 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 no candidates inside BAT error circle, but outside XRT error circle.
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.22, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist paragraph message for exposure 1 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 150 seconds with the White filter
starting 63 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 211222d01h31m17s391578usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1090472
-expid=661812612 -meonly -msg_srclist
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 661812612.45134 or about 2021:355:20:50:07 UT
Found 459 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 107 sources in
srclist catalog. Found 35 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 13 source(s) in Genie image catalog. Found 4 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.65 mag. Found 63 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 59580.3 counts in the large background region of 5967.0 pixels or a rate
of 9.985 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 19.93 mag. for a
4-arcsec aperture.
Found 2006.3 counts in the XRT position region of 198.0 pixels or a rate of
10.133 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.313 +/- 0.321 (1-sigma) cps or
20.87 mag and a range from 20.10 to 99.99 mag. The 3-sigma UL at the XRT
position is 1.276 cps or 19.34 mag. The closest srclist source has ra= 78.9029
dec= 0.9083 mag=19.22 sep=29.64". The closest Genie source has ra= 78.9031
dec= 0.9084 mag=18.34 sep=29.94".
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?
661812612 62 WHITE srclist found no candidates.
661812612 62 WHITE image found no candidates.
List afterglow candidates for other finding charts.
661812824 274 U srclist found no candidates.
661812824 274 U 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: white
GRB_DEC: 0.91450
GRB_ERROR: 5.5
GRB_RA: 78.89746
IMAGE_START_TIME: 20:50:07
MAGNITUDE: 19.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT