srclist overlap message for exposure 2 of trigger 884906
uvot_overlap.pl vrs. 2010-12-20b fem started at 190121d10h26m01s554967usUT
The observation of trigger 884906 started 2019-01-21T10:12:12.4
Examining file 884906_g314_uvot_sky_srclist.fits
The exposure ID is 569758332
The exposure time is undefined.
The filter is U.
The uvot region is centered at (247.8094,-47.8031) with a roll angle of 78.0
It is square with sides of 8.03 arc min. for an area of 64.51 sq arc min
The BAT error circle is centered at (247.7490,-47.7730) with a radius of 3.000 arc min
This is 3.031 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 21.01 sq. arc min or 0.74 of the BAT error circle
The XRT error circle is centered at (247.8088,-47.8065) with a radius of 0.087 arc min
This is 0.207 arc min from the center of the uvot region
The area of the XRT error circle is 0.024 sq. arc min
The UVOT/XRT overlap is 0.024 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 884906
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190121d10h26m02s421594usUT
Observation start time is 2019-01-21T10:12:12.4
Examining file 884906_g314_uvot_catalog_srclist.fits
The exposure ID is 569758332
The exposure is 250.000 sec.
The bin size is 2 pixels
The filter is U
There are 72 detected source(s) for 884906_g314
Aspect correction adds -0.00204 degrees (-0.489 sec of time = -4.93 arc sec) to RA
Aspect correction adds -0.00031 degrees (-1.10 arcsec) to Dec
Total aspect correction is 5.05 arcsec
Star catalogs centered at 247.8075 , -47.8021 with radius 6.35 arc min.
n_usno: 2533 n_gsc: 0
*** WARNING -- bright star catalog has 6 entries brighter than 12 mag
The brightest has mag 10.952
RA DEC Mag Color
bright star 0: 247.76332 (16:31:03.20) -47.79031 (-47:47:25.1) 11.64 USNO-V
bright star 1: 247.75635 (16:31:01.52) -47.75292 (-47:45:10.5) 11.55 USNO-V
bright star 2: 247.91489 (16:31:39.57) -47.80216 (-47:48:07.8) 10.95 USNO-V
bright star 3: 247.69070 (16:30:45.77) -47.82853 (-47:49:42.7) 11.89 USNO-V
bright star 4: 247.91860 (16:31:40.46) -47.87062 (-47:52:14.2) 11.43 USNO-V
bright star 5: 247.72314 (16:30:53.55) -47.71556 (-47:42:56.0) 11.78 USNO-V
Mean distance difference (CAT_DELTA) for 75 matched entries is 0.856" for 884906_g314
Mean and std. dev of mag. difference (MAG_DELTA) are 2.414 and 0.846 for 884906_g314
Found 7 entries without IDs and 0 entries that are acceptable afterglow candidates for 884906_g314.
Acceptable entries have no ID, XRT distances < 13", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
1 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=247.7490 (16:30:59.76) DEC=-47.7730 (-47:46:22.8)
XRT distances are from RA=247.8088 (16:31:14.11) DEC=-47.8065 (-47:48:23.4)
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 8:
ra=247.82803 dec=-47.82752 +/- 1.1" mag=17.72+/-0.35 dist=88.8 REFID=53
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
247.8099 -47.8042 8.7 -1 USNO-B1 17.43 17.93 17.71
The closest star is 8.74" away.
List UVOT sources within 10" of the XRT position:
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 18.12, XRT distances < 13",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 884906
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no image afterglow info
SRCLIST PROBLEM: high density of stars
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB190121 (Swift/BAT trigger 884906) at 10:06:57 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of nominal 250.000 seconds with the U filter
starting 292 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. Data from the 2.7'x2.7' sub-image are
not available at this time. The 8'x8' region for the list of sources generated
on-board covers 100% of the XRT error circle. Because of the density of
catalogued stars, further analysis is required to report an upper limit for any
afterglow in the region. No correction has been made for the large, but
uncertain, extinction expected.
------- notes for trigger 884906 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190121d10h26m05s116051usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=884906
-expid=569758332 -msg_srclist
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/884906/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for bat position. Unreliable extinction found for
xrt position.
*** Warning -- no exposure found, using srclist assumed value.
XRT position found for srclist. BAT position found.
*** Warning -- BAT and XRT error circles do NOT overlap.
UVOT exposure began at MET 569758332.44172 or about 2019:021:10:12:07 UT
Found 2529 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 43% of the srclist region. Found 72 sources in
srclist catalog. Found 7 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
The closest srclist source has ra= 247.8059 dec= -47.8189 mag=17.19 sep=45.31".
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?
569758332 292 U srclist found no candidates.
569758332 292 ? image data are not available.
List afterglow candidates for other finding charts.
569758173 133 WHITE srclist found no candidates.
569758173 133 WHITE image found no candidates.
------- Tokens for Quick GCN -------