srclist overlap message for exposure 2 of trigger 1091101
uvot_overlap.pl vrs. 2010-12-20b fem started at 211228d03h32m45s425928usUT
The observation of trigger 1091101 started 2021-12-27T23:37:29.3
Examining file ./1091101_g322_uvot_sky_srclist.fits
The exposure ID is 662341049
The exposure time is undefined.
The filter is U.
The uvot region is centered at (132.1530,-2.7359) with a roll angle of 129.2
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 (132.1260,-2.7020) with a radius of 3.000 arc min
This is 2.600 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 22.84 sq. arc min or 0.81 of the BAT error circle
The XRT error circle is centered at (132.1489,-2.7353) with a radius of 0.043 arc min
This is 0.250 arc min from the center of the uvot region
The area of the XRT error circle is 0.006 sq. arc min
The UVOT/XRT overlap is 0.006 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1091101
find_uvot_ag.pl vrs. 2020-10-30 fem started at 211228d03h33m26s358438usUT
Observation start time is 2021-12-27T23:37:29.3
Examining file ./1091101_g322_uvot_catalog_srclist.fits
The exposure ID is 662341049
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 32 detected source(s) for 1091101_g322
Aspect correction adds 0.00074 degrees (0.178 sec of time = 2.67 arc sec) to RA
Aspect correction adds -0.00017 degrees (-0.63 arcsec) to Dec
Total aspect correction is 2.74 arcsec
Star catalogs centered at 132.1548 , -2.7306 with radius 5.96 arc min.
n_usno: 452 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.68026
RA DEC Mag Color
bright star 0: 132.20829 (08:48:49.99) -2.79088 (-02:47:27.2) 10.68 USNO-V
Mean distance difference (CAT_DELTA) for 29 matched entries is 0.857" for 1091101_g322
Mean and std. dev of mag. difference (MAG_DELTA) are 2.180 and 0.669 for 1091101_g322
Found 4 entries without IDs and 2 entries that are acceptable afterglow candidates for 1091101_g322.
Acceptable entries have no ID, XRT distances < 6.5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=132.1260 (08:48:30.24) DEC=-2.7020 (-02:42:07.2)
XRT distances are from RA=132.1489 (08:48:35.73) DEC=-2.7353 (-02:44:07.1)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1091101_g322 with 5x5 stamp
ra=132.15120 (08:48:36.29) dec=-2.73716 (-02:44:13.8) +/- 1.1" mag=19.51+/-0.35
dist=10.7 REFID=32
*** The position of this source is inconsistent with the XRT position.
The position is 155.7 arc sec from the BAT position.
src: 0 distr. of nearby unmatched sources: 0 1 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
132.1523 -2.7341 11.8 -1 USNO-B1 20.06 19.08 19.52
132.1519 -2.7338 12.3 -1 USNO-B1 20.59 18.92 19.66
132.1541 -2.7370 10.4 -1 USNO-B1 12.90 12.27 12.55 *
132.1499 -2.7350 9.2 -1 USNO-B1 19.93 18.68 19.23
132.1499 -2.7354 8.0 -1 USNO-B1 20.55 19.12 19.75
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1091101_g322 with 5x5 stamp
ra=132.15307 (08:48:36.74) dec=-2.73743 (-02:44:14.7) +/- 1.1" mag=17.87+/-0.35
dist=16.9 REFID=14
*** The position of this source is inconsistent with the XRT position.
The position is 160.4 arc sec from the BAT position.
src: 2 distr. of nearby unmatched sources: 0 1 0 0 0
Found 5 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
132.1523 -2.7341 12.4 -1 USNO-B1 20.06 19.08 19.52
132.1519 -2.7338 13.7 -1 USNO-B1 20.59 18.92 19.66
132.1541 -2.7370 4.0 -1 USNO-B1 12.90 12.27 12.55 *
132.1499 -2.7350 14.5 -1 USNO-B1 19.93 18.68 19.23
132.1499 -2.7354 13.6 -1 USNO-B1 20.55 19.12 19.75
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Found 2 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
132.1499 -2.7350 3.8 -1 USNO-B1 19.93 18.68 19.23
132.1499 -2.7354 3.6 -1 USNO-B1 20.55 19.12 19.75
The closest star is 3.65" away.
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 18.12, XRT distances < 6.5",
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 2 of trigger 1091101
------ Start for Possible Stand-alone Circular ----
In response to GRB211227 (Swift/BAT trigger 1091101) at 23:32:06 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
294 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
0.020.
------- notes for trigger 1091101 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 211228d03h33m31s673664usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1091101
-expid=662341049 -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/1091101/
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 662341049.26938 or about 2021:361:23:37:24 UT
Found 448 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 32 sources in
srclist catalog. Found 4 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 3 source(s) in Genie image catalog. Found 0 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 9% of the
Genie image region.
Genie image analysis:
Found 17404.9 counts in the large background region of 6084.0 pixels or a rate
of 2.861 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 777.6 counts in the XRT position region of 202.0 pixels or a rate of
3.850 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.370 +/- 0.120 (1-sigma) cps or
19.26 mag and a range from 18.95 to 19.69 mag. The 3-sigma UL at the XRT
position is 0.731 cps or 18.52 mag. The closest srclist source has ra= 132.1512
dec= -2.7372 mag=19.51 sep=10.68". The closest Genie source has ra= 132.1477
dec= -2.7309 mag=17.52 sep=16.57".
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?
662341049 293 U srclist found no candidates.
662341049 293 U image found no candidates.
List afterglow candidates for other finding charts.
662340837 81 WHITE srclist found no candidates.
662340837 81 WHITE image found no candidates.
662341626 870 WHITE srclist found no candidates.
662341626 870 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -2.73531
GRB_ERROR: 6.5
GRB_RA: 132.14888
IMAGE_START_TIME: 23:37:24
MAGNITUDE: 18.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT