image overlap message for exposure 1 of trigger 811074
uvot_overlap.pl vrs. 2010-12-20b fem started at 180221d07h29m08s081861usUT
The observation of trigger 811074 started 2018-02-21T07:20:15.6
Examining file 811074_g2970_uvot_sky_image.fits
The exposure ID is 540890415
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (326.7761,-72.8633) with a roll angle of 8.6
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 (326.7720,-72.8680) with a radius of 3.000 arc min
This is 0.291 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
Could not find the location of an XRT error circle
image afterglow message for exposure 1 of trigger 811074
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180221d07h29m09s618543usUT
Observation start time is 2018-02-21T07:20:15.6
Examining file 811074_g2970_uvot_catalog_image.fits
The exposure ID is 540890415
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 3 detected source(s) for 811074_g2970
Aspect correction adds 0.00078 degrees (0.187 sec of time = 0.82 arc sec) to RA
Aspect correction adds 0.00041 degrees ( 1.49 arcsec) to Dec
Total aspect correction is 1.70 arcsec
Star catalogs centered at 326.7707 , -72.8597 with radius 2.50 arc min.
n_usno: 65 n_gsc: 66
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.52136
RA DEC Mag Color
bright star 0: 326.69574 (21:46:46.98) -72.87591 (-72:52:33.3) 11.52 USNO-V
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 3 matched entries is 0.309" for 811074_g2970
Mean and std. dev of mag. difference (MAG_DELTA) are 0.680 and 0.186 for 811074_g2970
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 811074_g2970.
Acceptable entries have no ID, BAT distance < 200" or XRT distance < 10", 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=326.7720 (21:47:05.28) DEC=-72.8680 (-72:52:04.8)
XRT distances are as reported in catalog file.
There are 2.4906375E+05 counts in the bkg source region of 6315.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 39.440 counts/pixel (5-sig UL in 4" is 19.35 mag) for 811074_g2970
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.35, BAT distances < 200",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 811074_540890415_180221d07h29m09s618543usUT_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(326.7761,-72.8633,45")
image paragraph message for exposure 1 of trigger 811074
IMAGE PROBLEM: partial overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB180221 (Swift/BAT trigger 811074) at 06:30:44 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 2950 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 25%
of the BAT 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 BAT 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 0.05.
------- notes for trigger 811074 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180221d07h29m31s747323usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=811074
-expid=540890415 -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/811074/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
No XRT position found for srclist. No XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 540890415.601 or about 2018:052:07:20:10 UT
Found 420 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 42 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
18.66 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 19.35 mag. Found 66 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 249063.8 counts in the large background region of 6315.0 pixels or a rate
of 39.440 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 19.36 mag. for a
4-arcsec aperture.
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?
540890415 2949 WHITE 326.80693 -72.90166 19.01/18.7 126.7 srclist Yes
540890415 2949 WHITE 326.84223 -72.86971 19.02/18.7 74.7 srclist Yes
540890415 2949 WHITE 326.64471 -72.89131 19.05/18.7 158.8 srclist Yes
540890415 2949 WHITE 326.77213 -72.85769 19.13/18.7 37.1 srclist Yes
540890415 2949 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -72.86800
GRB_ERROR: 200
GRB_RA: 326.77200
IMAGE_START_TIME: 07:20:10
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT