image overlap message for exposure 2 of trigger 1001130
uvot_overlap.pl vrs. 2010-12-20b fem started at 201022d01h24m08s992082usUT
The observation of trigger 1001130 started 2020-10-21T20:33:02.0
Examining file ./1001130_g342_uvot_sky_image.fits
The exposure ID is 625005181
The exposure time is 249.924 (seconds)
The filter is U.
The uvot region is centered at (12.5494,-55.8418) with a roll angle of 195.2
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 (12.5500,-55.8390) with a radius of 3.000 arc min
This is 0.171 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 7.17 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (12.5289,-55.8655) with a radius of 0.028 arc min
This is 1.580 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.000 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1001130
find_uvot_ag.pl vrs. 2017-02-17 fem started at 201022d01h24m20s926333usUT
Observation start time is 2020-10-21T20:33:02.0
Examining file ./1001130_g342_uvot_catalog_image.fits
The exposure ID is 625005181
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 3 detected source(s) for 1001130_g342
Aspect correction adds -0.00138 degrees (-0.331 sec of time = -2.79 arc sec) to RA
Aspect correction adds 0.00032 degrees ( 1.16 arcsec) to Dec
Total aspect correction is 3.02 arcsec
Star catalogs centered at 12.5550 , -55.8415 with radius 2.44 arc min.
n_usno: 72 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 3 matched entries is 0.583" for 1001130_g342
Mean and std. dev of mag. difference (MAG_DELTA) are 0.878 and 0.910 for 1001130_g342
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1001130_g342.
Acceptable entries have no ID, XRT distances < 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=12.5500 (00:50:12.00) DEC=-55.8390 (-55:50:20.4)
XRT distances are from RA=12.5289 (00:50:06.93) DEC=-55.8655 (-55:51:55.8)
*** WARNING 33 per cent of entries have no IDs.
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1001130_g342 with genie
ra=12.58327 (00:50:19.98) dec=-55.83059 (-55:49:50.1) +/- 0.9" mag=19.77+/-0.22
dist=167.0 REFID=3 major=0.9 minor=0.3 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 73.8 arc sec from the BAT position.
This source is near the edge of image (0.985)
Found 4 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
12.5768 -55.8333 16.2 -1 USNO-B1 19.41 19.00 19.18
12.5842 -55.8302 2.4 -1 USNO-B1 17.64 16.74 17.14 *
12.5916 -55.8327 18.5 -1 USNO-B1 20.16 19.48 19.78
12.5878 -55.8262 18.4 -1 USNO-B1 20.71 19.52 20.05
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 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 9833.8984 counts in the bkg source region of 6305.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.560 counts/pixel (5-sig UL in 4" is 20.22 mag) for 1001130_g342
Do not compute counts in XRT region because position is too far from center.
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 20.78, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1001130_625005181_201022d01h24m20s926333usUT_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(12.5494,-55.8418,45")
image paragraph message for exposure 2 of trigger 1001130
------ Start for Possible Stand-alone Circular ----
In response to GRB201021 (Swift/BAT trigger 1001130) at 20:27:18 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
317 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 00:50:06.96 = 12.52899
DEC(J2000) = -55:51:57.7 = -55.86604
with a 90%-confidence error radius of about 1.10 arc sec. This position is 2.0
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.62. No correction has been made for the expected extinction corresponding to
E(B-V) of 0.02.
------- notes for trigger 1001130 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 201022d01h24m24s738063usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1001130
-expid=625005181 -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/1001130/
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 625005181.97354 or about 2020:295:20:32:56 UT
Found 723 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 41 sources in
srclist catalog. Found 6 srclist source(s) without IDs. There are 1 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 1 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.78 mag. Found 68 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 7% of the
Genie image region. The closest Genie source has ra= 12.5412 dec= -55.8642
mag=20.38 sep=25.36".
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?
625005181 316 U 12.52899 -55.86604 16.62/18.1 2.0 srclist Yes
625005181 316 U image found no candidates.
List afterglow candidates for other finding charts.
625004969 104 WHITE 12.52855 -55.86576 17.19/19.2 1.1 srclist Yes
625004969 104 WHITE image found no candidates.
625005738 873 WHITE 12.52865 -55.86571 18.39/18.5 2.1 srclist Yes
625005738 873 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -55.86604
GRB_ERROR: 1.10
GRB_RA: 12.52899
IMAGE_START_TIME: 20:32:56
MAGNITUDE: 16.62
MAG_ERROR: 0.4
MESSAGE_TYPE: ACK
SOURCE: XRT