image overlap message for exposure 2 of trigger 971846
uvot_overlap.pl vrs. 2010-12-20b fem started at 200513d04h30m14s465010usUT
The observation of trigger 971846 started 2020-05-12T20:37:36.8
Examining file ./971846_g260_uvot_sky_image.fits
The exposure ID is 611008656
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (7.4147,-2.2075) with a roll angle of 62.0
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 (7.3960,-2.1990) with a radius of 3.000 arc min
This is 1.232 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 7.16 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (7.4147,-2.2104) with a radius of 0.023 arc min
This is 0.172 arc min from the center of the uvot region
The area of the XRT error circle is 0.002 sq. arc min
The UVOT/XRT overlap is 0.002 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 971846
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200513d04h30m25s654067usUT
Observation start time is 2020-05-12T20:37:36.8
Examining file ./971846_g260_uvot_catalog_image.fits
The exposure ID is 611008656
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 1 detected source(s) for 971846_g260
Aspect correction adds 0.00018 degrees (0.044 sec of time = 0.65 arc sec) to RA
Aspect correction adds 0.00066 degrees ( 2.39 arcsec) to Dec
Total aspect correction is 2.47 arcsec
Star catalogs centered at 7.3943 , -2.1868 with radius 2.00 arc min.
n_usno: 46 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 1 matched entries is 0.376" for 971846_g260
Mean and std. dev of mag. difference (MAG_DELTA) are 0.808 and 0.000 for 971846_g260
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 971846_g260.
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= 7.3960 (00:29:35.04) DEC=-2.1990 (-02:11:56.4)
XRT distances are from RA= 7.4147 (00:29:39.54) DEC=-2.2104 (-02:12:37.3)
Found 1 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
7.4143 -2.2122 6.8 -1 USNO-B1 20.89 19.66 20.21
The closest star is 6.80" away.
List UVOT sources within 10" of the XRT position:
There are 86649.398 counts in the bkg source region of 6306.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 13.741 counts/pixel (5-sig UL in 4" is 19.04 mag) for 971846_g260
There are 2766.2385 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 13.762 counts/pixel for 971846_g260
There are 16977.521 counts in the xrt_bkg source region of 1250.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 13.582 counts/pixel (5-sig UL in 4" is 19.05 mag) for 971846_g260
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 19.60, 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: 971846_611008656_200513d04h30m25s654067usUT_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(7.4147,-2.2075,45")
Region file: 971846_611008656_200513d04h30m25s654067usUT_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(7.41475,-2.21036,8")
Region file: 971846_611008656_200513d04h30m25s654067usUT_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(7.41475,-2.21036,25")
fk5;-circle(7.41475,-2.21036,15")
image paragraph message for exposure 2 of trigger 971846
------ Start for Possible Stand-alone Circular ----
In response to GRB200512 (Swift/BAT trigger 971846) at 20:33:15 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
235 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 19.2 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 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.03.
------- notes for trigger 971846 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200513d04h30m29s818316usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=971846
-expid=611008656 -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/971846/
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 611008656.80078 or about 2020:133:20:37:31 UT
Found 290 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 11 sources in
srclist catalog. Found 1 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 1 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 19.60 mag. Found 42 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 86649.4 counts in the large background region of 6306.0 pixels or a rate
of 13.741 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 19.08 mag. for a
4-arcsec aperture.
Found 2766.2 counts in the XRT position region of 201.0 pixels or a rate of
13.762 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.145 +/- 0.226 (1-sigma) cps or
20.48 mag and a range from 19.46 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.824 cps or 18.59 mag. The closest srclist source has ra= 7.3916
dec= -2.2128 mag=15.63 sep=83.91". The closest Genie source has ra= 7.3943
dec= -2.1868 mag=17.18 sep=112.23".
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?
611008656 235 U srclist found no candidates.
611008656 235 U image found no candidates.
List afterglow candidates for other finding charts.
611008498 77 WHITE srclist found no candidates.
611008498 77 WHITE image found no candidates.
611009283 862 ? srclist data are not available.
611009283 862 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -2.21036
GRB_ERROR: 5
GRB_RA: 7.41475
IMAGE_START_TIME: 20:37:31
MAGNITUDE: 18.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT