image overlap message for exposure 2 of trigger 1014012
uvot_overlap.pl vrs. 2010-12-20b fem started at 201221d18h57m36s573532usUT
The observation of trigger 1014012 started 2020-12-21T18:46:54.0
Examining file 1014012_g319_uvot_sky_image.fits
The exposure ID is 630269213
The exposure time is 95.154 (seconds)
The filter is U.
The uvot region is centered at (278.2053,34.4073) with a roll angle of 188.4
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 (278.2050,34.4110) with a radius of 3.000 arc min
This is 0.223 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 2 of trigger 1014012
find_uvot_ag.pl vrs. 2020-10-30 fem started at 201221d18h57m37s680371usUT
Observation start time is 2020-12-21T18:46:54.0
Examining file 1014012_g319_uvot_catalog_image.fits
The exposure ID is 630269213
The exposure is 95.154 sec.
The bin size is 2 pixels
The filter is U
There are 10 detected source(s) for 1014012_g319
Aspect correction adds -0.00086 degrees (-0.207 sec of time = -2.56 arc sec) to RA
Aspect correction adds 0.00024 degrees ( 0.85 arcsec) to Dec
Total aspect correction is 2.70 arcsec
Star catalogs centered at 278.2040 , 34.4049 with radius 2.46 arc min.
n_usno: 140 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 10 matched entries is 0.259" for 1014012_g319
Mean and std. dev of mag. difference (MAG_DELTA) are 0.966 and 0.267 for 1014012_g319
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1014012_g319.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=278.2050 (18:32:49.20) DEC=34.4110 (+34:24:39.6)
XRT distances are as reported in catalog file.
There are 12117.077 counts in the bkg source region of 6016.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.014 counts/pixel (5-sig UL in 4" is 19.04 mag) for 1014012_g319
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.03, 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: 1014012_630269213_201221d18h57m37s680371usUT_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(278.2053,34.4073,45")
fk5;-circle(278.205358956715,34.4090126821843,6")
fk5;-circle(278.198157789442,34.4050589592366,6")
fk5;-circle(278.190875475673,34.414121517411,6")
fk5;-circle(278.214768840744,34.3977636374147,6")
image paragraph message for exposure 2 of trigger 1014012
IMAGE PROBLEM: partial overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB201221 (Swift/BAT trigger 1014012) at 18:41:33 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 95 seconds with the U filter starting
293 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 19.2 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 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.07.
------- notes for trigger 1014012 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 201221d18h57m39s168720usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1014012
-expid=630269213 -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/1014012/
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 630269213.97222 or about 2020:356:18:46:48 UT
Found 1442 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 14% of the srclist region. Found 113 sources in
srclist catalog. Found 9 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.03 mag.
Found 10 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 19.03 mag. Found 136 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
15% of the Genie image region.
Genie image analysis:
Found 12117.1 counts in the large background region of 6016.0 pixels or a rate
of 2.014 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 18.89 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?
630269213 293 U srclist found no candidates.
630269213 293 U image found no candidates.
List afterglow candidates for other finding charts.
630269056 136 WHITE srclist found no candidates.
630269056 136 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 34.41100
GRB_ERROR: 200
GRB_RA: 278.20500
IMAGE_START_TIME: 18:46:48
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT