image overlap message for exposure 3 of trigger 990358
uvot_overlap.pl vrs. 2010-12-20b fem started at 200817d02h17m32s150705usUT
The observation of trigger 990358 started 2020-08-17T02:08:23.5
Examining file 990358_g901_uvot_sky_image.fits
The exposure ID is 619322903
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (154.1283,-33.9171) with a roll angle of 350.5
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 (154.1310,-33.9210) with a radius of 3.000 arc min
This is 0.271 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 3 of trigger 990358
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200817d02h17m33s250937usUT
Observation start time is 2020-08-17T02:08:23.5
Examining file 990358_g901_uvot_catalog_image.fits
The exposure ID is 619322903
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 20 detected source(s) for 990358_g901
Aspect correction adds -0.00031 degrees (-0.075 sec of time = -0.94 arc sec) to RA
Aspect correction adds 0.00064 degrees ( 2.30 arcsec) to Dec
Total aspect correction is 2.48 arcsec
Star catalogs centered at 154.1282 , -33.9140 with radius 2.66 arc min.
n_usno: 139 n_gsc: 0
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 10.07854
RA DEC Mag Color
bright star 0: 154.16239 (10:16:38.97) -33.91751 (-33:55:03.1) 10.08 USNO-V
bright star 1: 154.17156 (10:16:41.17) -33.93304 (-33:55:59.0) 11.36 USNO-V
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 16 matched entries is 0.439" for 990358_g901
Mean and std. dev of mag. difference (MAG_DELTA) are 0.920 and 0.307 for 990358_g901
Found 4 entries without IDs and 2 entries that are acceptable afterglow candidates for 990358_g901.
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.
2 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=154.1310 (10:16:31.44) DEC=-33.9210 (-33:55:15.6)
XRT distances are as reported in catalog file.
-----------------
Entry 18 in the list of sources is a candidate afterglow for 990358_g901 with genie
ra=154.09910 (10:16:23.78) dec=-33.91925 (-33:55:09.3) +/- 0.6" mag=18.73+/-0.15
dist=95.5 REFID=15 major=1.1 minor=0.9 flag=0
This source is near the edge of image (0.996)
Found 2 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
154.0981 -33.9192 3.1 -1 USNO-B1 14.10 13.16 13.57 *
154.0972 -33.9202 6.6 -1 USNO-B1 21.19 17.63 19.21
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
-----------------
Entry 19 in the list of sources is a candidate afterglow for 990358_g901 with genie
ra=154.11049 (10:16:26.52) dec=-33.89099 (-33:53:27.6) +/- 1.0" mag=20.59+/-0.29
dist=124.2 REFID=2 major=0.9 minor=0.4 flag=0
This source is near the edge of image (1.008)
Found 2 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
154.1132 -33.8926 10.1 -1 USNO-B1 21.32 17.98 19.47
154.1097 -33.8908 2.4 -1 USNO-B1 17.90 16.78 17.28 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
There are 1.0508184E+05 counts in the bkg source region of 5920.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 17.750 counts/pixel (5-sig UL in 4" is 19.79 mag) for 990358_g901
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.78, 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: 990358_619322903_200817d02h17m33s250937usUT_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(154.1283,-33.9171,45")
fk5;-circle(154.129710524467,-33.9288496921087,6")
fk5;-circle(154.126688764665,-33.9116554122671,6")
fk5;-circle(154.135975591401,-33.9110288528221,6")
fk5;-circle(154.125580125767,-33.9098539093163,6")
fk5;-circle(154.115850892496,-33.926288499135,6")
image paragraph message for exposure 3 of trigger 990358
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: partial overlap
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB200817 (Swift/BAT trigger 990358) at 01:53:21 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 876 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
0.10.
------- notes for trigger 990358 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200817d02h17m35s028394usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=990358
-expid=619322903 -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/990358/
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 619322903.4511 or about 2020:230:02:08:18 UT
Found 1217 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 11% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 20 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 20 source(s) in Genie image catalog. Found 4 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.78 mag. Found 135 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
13% of the Genie image region.
Genie image analysis:
Found 105081.8 counts in the large background region of 5920.0 pixels or a rate
of 17.750 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 19.79 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 19.09 mag.
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?
619322903 876 WHITE srclist found no candidates.
619322903 876 WHITE image found no candidates.
List afterglow candidates for other finding charts.
619322114 87 WHITE srclist found no candidates.
619322114 87 WHITE image found no candidates.
619322325 298 U srclist found no candidates.
619322325 298 U image found no candidates.
------- Tokens for Quick GCN -------