image overlap message for exposure 1 of trigger 1091101
uvot_overlap.pl vrs. 2010-12-20b fem started at 211228d03h32m46s517554usUT
The observation of trigger 1091101 started 2021-12-27T23:33:57.1
Examining file ./1091101_g110_uvot_sky_image.fits
The exposure ID is 662340837
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (132.1507,-2.7374) with a roll angle of 129.2
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 (132.1260,-2.7020) with a radius of 3.000 arc min
This is 2.589 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 4.42 sq. arc min or 0.16 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 0.167 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
image afterglow message for exposure 1 of trigger 1091101
find_uvot_ag.pl vrs. 2020-10-30 fem started at 211228d03h33m13s150628usUT
Observation start time is 2021-12-27T23:33:57.1
Examining file ./1091101_g110_uvot_catalog_image.fits
The exposure ID is 662340837
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 9 detected source(s) for 1091101_g110
Aspect correction adds 0.00061 degrees (0.146 sec of time = 2.19 arc sec) to RA
Aspect correction adds -0.00017 degrees (-0.61 arcsec) to Dec
Total aspect correction is 2.27 arcsec
Star catalogs centered at 132.1460 , -2.7418 with radius 2.44 arc min.
n_usno: 91 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 7 matched entries is 0.675" for 1091101_g110
Mean and std. dev of mag. difference (MAG_DELTA) are 1.145 and 0.709 for 1091101_g110
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1091101_g110.
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.
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_g110 with genie
ra=132.15064 (08:48:36.15) dec=-2.73481 (-02:44:05.3) +/- 0.6" mag=17.17+/-0.14
dist=6.6 REFID=6 major=6.0 minor=0.8 flag=2 (blended)
*** The position of this source is inconsistent with the XRT position.
The position is 147.7 arc sec from the BAT position.
Found 7 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
132.1499 -2.7354 3.4 -1 USNO-B1 20.55 19.12 19.75 *
132.1499 -2.7350 2.8 -1 USNO-B1 19.93 18.68 19.23 *
132.1541 -2.7370 14.7 -1 USNO-B1 12.90 12.27 12.55
132.1519 -2.7338 5.8 -1 USNO-B1 20.59 18.92 19.66
132.1523 -2.7341 6.6 -1 USNO-B1 20.06 19.08 19.52
132.1479 -2.7307 18.0 -1 USNO-B1 16.74 15.84 16.24
132.1481 -2.7305 18.0 -1 USNO-B1 16.12 15.69 15.88
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 3 in the list of sources is a candidate afterglow for 1091101_g110 with genie
ra=132.15285 (08:48:36.68) dec=-2.74088 (-02:44:27.2) +/- 0.6" mag=16.70+/-0.14
dist=24.6 REFID=7 major=7.3 minor=4.0 flag=2 (blended)
*** The position of this source is inconsistent with the XRT position.
The position is 170.0 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
132.1541 -2.7370 14.6 -1 USNO-B1 12.90 12.27 12.55
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 7.3
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 -2.7354 3.6 -1 USNO-B1 20.55 19.12 19.75
132.1499 -2.7350 3.8 -1 USNO-B1 19.93 18.68 19.23
The closest star is 3.65" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=132.15064 (08:48:36.15) dec=-2.73481 (-02:44:05.3) +/- 0.6" mag=17.17+/-0.14 dist=6.6 REFID=6 flag=2
There are 51947.824 counts in the bkg source region of 5750.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 9.034 counts/pixel (5-sig UL in 4" is 20.15 mag) for 1091101_g110
There are 2535.6304 counts in the xrt source region of 205.00000 pixels.
Rate in xrt region with 8 arcsec radius is 12.369 counts/pixel for 1091101_g110
There are 9234.7617 counts in the xrt_bkg source region of 1008.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 9.161 counts/pixel (5-sig UL in 4" is 20.15 mag) for 1091101_g110
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 20.71, XRT distances < 6.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1091101_662340837_211228d03h33m13s150628usUT_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(132.1507,-2.7374,45")
fk5;-circle(132.150643667397,-2.73481180614471,6")
fk5;-circle(132.147606500599,-2.73085902690928,6")
fk5;-circle(132.154061682429,-2.73701808532148,6")
fk5;-circle(132.152850099082,-2.7408763723971,6")
fk5;-circle(132.158084534422,-2.73548524279012,6")
Region file: 1091101_662340837_211228d03h33m13s150628usUT_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(132.14888,-2.73531,8")
Region file: 1091101_662340837_211228d03h33m13s150628usUT_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(132.14888,-2.73531,25")
fk5;-circle(132.14888,-2.73531,15")
fk5;-circle(132.147606500599,-2.73085902690928,6")
fk5;-circle(132.154061682429,-2.73701808532148,6")
fk5;-circle(132.152850099082,-2.7408763723971,6")
image paragraph message for exposure 1 of trigger 1091101
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ 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 150 seconds with the White filter
starting 81 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
0.020.
------- notes for trigger 1091101 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 211228d03h33m22s662840usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1091101
-expid=662340837 -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/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 662340837.07328 or about 2021:361:23:33:52 UT
Found 440 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 41 sources in
srclist catalog. Found 2 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 9 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 2 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.71 mag. Found 87 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 10% of the Genie image region.
Genie image analysis:
Found 51947.8 counts in the large background region of 5750.0 pixels or a rate
of 9.034 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 19.98 mag. for a
4-arcsec aperture.
Found 2535.6 counts in the XRT position region of 205.0 pixels or a rate of
12.369 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 4.383 +/- 0.360 (1-sigma) cps or
18.00 mag and a range from 17.91 to 18.09 mag. The 3-sigma UL at the XRT
position is 5.464 cps or 17.76 mag. The closest srclist source has ra= 132.1518
dec= -2.7331 mag=20.05 sep=13.11".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 132.1506 dec= -2.7348 mag=17.17 sep=6.59". The closest Genie
source has ra= 132.1506 dec= -2.7348 mag=17.17 sep=6.59".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 81 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 08:48:36.15 = 132.15064
DEC(J2000) = -02:44:05.3 = -2.73481
with a 90%-confidence error radius of about 0.61 arc sec. This position is 6.59
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.17 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.020.
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?
662340837 81 WHITE srclist found no candidates.
662340837 81 WHITE image found no candidates.
List afterglow candidates for other finding charts.
662341049 293 U srclist found no candidates.
662341049 293 U 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: white
GRB_DEC: -2.73531
GRB_ERROR: 6.5
GRB_RA: 132.14888
IMAGE_START_TIME: 23:33:52
MAGNITUDE: 17.8
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT