image overlap message for exposure 2 of trigger 1015919
uvot_overlap.pl vrs. 2010-12-20b fem started at 210105d03h11m07s999603usUT
The observation of trigger 1015919 started 2021-01-04T21:15:33.1
Examining file ./1015919_g322_uvot_sky_image.fits
The exposure ID is 631487733
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (53.5951,37.9301) with a roll angle of 273.4
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 (53.6010,37.9310) with a radius of 3.000 arc min
This is 0.282 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 (53.5530,37.9305) with a radius of 0.032 arc min
This is 1.997 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 1015919
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210105d03h11m19s683733usUT
Observation start time is 2021-01-04T21:15:33.1
Examining file ./1015919_g322_uvot_catalog_image.fits
The exposure ID is 631487733
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 6 detected source(s) for 1015919_g322
Aspect correction adds -0.00059 degrees (-0.142 sec of time = -1.68 arc sec) to RA
Aspect correction adds 0.00060 degrees ( 2.17 arcsec) to Dec
Total aspect correction is 2.75 arcsec
Star catalogs centered at 53.5925 , 37.9295 with radius 2.19 arc min.
n_usno: 65 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.398" for 1015919_g322
Mean and std. dev of mag. difference (MAG_DELTA) are 1.535 and 0.750 for 1015919_g322
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1015919_g322.
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=53.6010 (03:34:24.24) DEC=37.9310 (+37:55:51.6)
XRT distances are from RA=53.5530 (03:34:12.71) DEC=37.9305 (+37:55:49.8)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 19597.902 counts in the bkg source region of 5826.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.364 counts/pixel (5-sig UL in 4" is 19.81 mag) for 1015919_g322
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 20.36, 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: 1015919_631487733_210105d03h11m19s683733usUT_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(53.5951,37.9301,45")
fk5;-circle(53.5936704687169,37.9289957134164,6")
fk5;-circle(53.5938449209187,37.925290828083,6")
fk5;-circle(53.6062907725734,37.923619533565,6")
fk5;-circle(53.5893112007543,37.9265597118271,6")
fk5;-circle(53.5787826893443,37.927054619878,6")
image paragraph message for exposure 2 of trigger 1015919
IMAGE PROBLEM: no overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB210104 (Swift/BAT trigger 1015919) at 21:10:10 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
295 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 none of the
XRT error circle. 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 0.79.
------- notes for trigger 1015919 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210105d03h11m24s066777usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1015919
-expid=631487733 -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/1015919/
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 631487733.09982 or about 2021:004:21:15:28 UT
Found 765 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 47 sources in
srclist catalog. Found 8 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 6 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 20.36 mag. Found 61 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 8% of the
Genie image region.
Genie image analysis:
Found 19597.9 counts in the large background region of 5826.0 pixels or a rate
of 3.364 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 19.66 mag. for a
4-arcsec aperture. The closest srclist source has ra= 53.5936 dec= 37.9252
mag=17.74 sep=117.08". The closest Genie source has ra= 53.5788 dec= 37.9271
mag=19.23 sep=74.37".
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?
631487733 295 U srclist found no candidates.
631487733 295 U image found no candidates.
List afterglow candidates for other finding charts.
631487521 83 WHITE srclist found no candidates.
631487521 83 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 37.93050
GRB_ERROR: 5
GRB_RA: 53.55296
IMAGE_START_TIME: 21:15:28
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT