image overlap message for exposure 2 of trigger 999948
uvot_overlap.pl vrs. 2010-12-20b fem started at 201013d08h45m21s737089usUT
The observation of trigger 999948 started 2020-10-13T03:51:42.1
Examining file ./999948_g311_uvot_sky_image.fits
The exposure ID is 624253902
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (107.3973,57.0374) with a roll angle of 93.2
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 (107.3880,57.0360) with a radius of 3.000 arc min
This is 0.313 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 (107.3942,57.0342) with a radius of 0.032 arc min
This is 0.213 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 0.003 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 999948
find_uvot_ag.pl vrs. 2017-02-17 fem started at 201013d08h45m38s938169usUT
Observation start time is 2020-10-13T03:51:42.1
Examining file ./999948_g311_uvot_catalog_image.fits
The exposure ID is 624253902
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 14 detected source(s) for 999948_g311
Aspect correction adds 0.00314 degrees (0.754 sec of time = 6.15 arc sec) to RA
Aspect correction adds -0.00073 degrees (-2.62 arcsec) to Dec
Total aspect correction is 6.69 arcsec
Star catalogs centered at 107.3956 , 57.0370 with radius 2.53 arc min.
n_usno: 111 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.17728
RA DEC Mag Color
bright star 0: 107.43117 (07:09:43.48) 57.01833 (+57:01:06.0) 11.18 USNO-V
Mean distance difference (CAT_DELTA) for 17 matched entries is 0.501" for 999948_g311
Mean and std. dev of mag. difference (MAG_DELTA) are 0.812 and 1.017 for 999948_g311
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 999948_g311.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=107.3880 (07:09:33.12) DEC=57.0360 (+57:02:09.6)
XRT distances are from RA=107.3942 (07:09:34.62) DEC=57.0342 (+57:02:03.2)
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
107.3935 57.0342 1.5 -1 USNO-B1 16.24 16.19 16.21
The closest star is 1.47" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=107.39352 (07:09:34.45) dec=57.03412 (+57:02:02.8) +/- 0.6" mag=16.50+/-0.14 dist=1.5 REFID=10 flag=0
There are 11762.479 counts in the bkg source region of 5900.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.994 counts/pixel (5-sig UL in 4" is 20.09 mag) for 999948_g311
There are 1531.5504 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 7.658 counts/pixel for 999948_g311
There are 2461.5554 counts in the xrt_bkg source region of 1225.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.009 counts/pixel (5-sig UL in 4" is 20.09 mag) for 999948_g311
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 20.64, 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: 999948_624253902_201013d08h45m38s938169usUT_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(107.3973,57.0374,45")
fk5;-circle(107.393523145609,57.0341159288343,6")
fk5;-circle(107.391736008913,57.0418833173231,6")
fk5;-circle(107.384230789443,57.0472420226756,6")
fk5;-circle(107.410469565804,57.0308804700994,6")
Region file: 999948_624253902_201013d08h45m38s938169usUT_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(107.39425,57.03422,8")
Region file: 999948_624253902_201013d08h45m38s938169usUT_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(107.39425,57.03422,25")
fk5;-circle(107.39425,57.03422,15")
fk5;-circle(107.391736008913,57.0418833173231,6")
image paragraph message for exposure 2 of trigger 999948
SRCLIST PROBLEM: srclist filled telemetry buffer
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB201013 (Swift/BAT trigger 999948) at 03:46:30 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
285 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
coverage of the XRT error circle by the 8'x8' region for the list of sources
generated on-board is uncertain because the large number of sources filled the
available telemetry. 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 0.05.
------- notes for trigger 999948 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 201013d08h45m43s488342usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=999948
-expid=624253902 -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/999948/
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 624253902.11438 or about 2020:287:03:51:37 UT
Found 1029 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 10% of the srclist region. Found 185 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 81 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 14 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. 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
20.64 mag. Found 107 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 11% of the Genie image region.
Genie image analysis:
Found 11762.5 counts in the large background region of 5900.0 pixels or a rate
of 1.994 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 20.13 mag. for a
4-arcsec aperture.
Found 1531.6 counts in the XRT position region of 200.0 pixels or a rate of
7.658 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 4.519 +/- 0.160 (1-sigma) cps or
16.74 mag and a range from 16.70 to 16.78 mag. The 3-sigma UL at the XRT
position is 4.998 cps or 16.63 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 19.43 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 107.3940 dec= 57.0342 mag=17.41 sep=0.52".
The closest srclist source has ra= 107.3940 dec= 57.0342 mag=17.41 sep=0.52".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 107.3935 dec= 57.0341 mag=16.50 sep=1.47". The closest Genie
source has ra= 107.3935 dec= 57.0341 mag=16.50 sep=1.47".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 250 seconds with the U filter starting
285 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 07:09:34.44 = 107.39352
DEC(J2000) = +57:02:02.8 = 57.03412
with a 90%-confidence error radius of about 0.62 arc sec. This position is 1.47
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.50 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.05.
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?
624253902 285 U srclist found no candidates.
624253902 285 U image found no candidates.
List afterglow candidates for other finding charts.
624253690 73 WHITE srclist found no candidates.
624253690 73 WHITE image found no candidates.
624254481 864 WHITE srclist found no candidates.
624254481 864 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 57.03422
GRB_ERROR: 5
GRB_RA: 107.39425
IMAGE_START_TIME: 03:51:37
MAGNITUDE: 16.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT