srclist overlap message for exposure 2 of trigger 808483
uvot_overlap.pl vrs. 2010-12-20b fem started at 180204d10h49m32s774925usUT
The observation of trigger 808483 started 2018-02-04T02:41:41.3
Examining file ./808483_g324_uvot_sky_srclist.fits
The exposure ID is 539404901
The exposure time is undefined.
The filter is U.
The uvot region is centered at (330.1170,30.8399) with a roll angle of 196.0
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (330.1180,30.8460) with a radius of 3.000 arc min
This is 0.366 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 28.27 sq. arc min or 1.00 of the BAT error circle
The XRT error circle is centered at (330.1333,30.8378) with a radius of 0.023 arc min
This is 0.847 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
srclist afterglow message for exposure 2 of trigger 808483
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180204d10h49m40s525350usUT
Observation start time is 2018-02-04T02:41:41.3
Examining file ./808483_g324_uvot_catalog_srclist.fits
The exposure ID is 539404901
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 190 detected source(s) for 808483_g324
*** WARNING -- the sources have filled the available telemetry buffer (190).
srclist_overlap returned: bat_overlap 1.000
srclist_overlap returned: xrt_overlap 1.000
Dimmest detected source in 808483_g324 has mag 18.41
Aspect correction adds 0.00026 degrees (0.063 sec of time = 0.81 arc sec) to RA
Aspect correction adds -0.00059 degrees (-2.11 arcsec) to Dec
Total aspect correction is 2.26 arcsec
Star catalogs centered at 330.1191 , 30.8344 with radius 8.64 arc min.
n_usno: 1351 n_gsc: 1347
*** WARNING -- bright star catalog has 9 entries brighter than 12 mag
The brightest has mag 8.55646
RA DEC Mag Color
bright star 0: 330.12305 (22:00:29.53) 30.85735 (+30:51:26.5) 11.78 USNO-V
bright star 1: 330.15862 (22:00:38.07) 30.76444 (+30:45:52.0) 10.64 USNO-V
bright star 2: 330.05386 (22:00:12.93) 30.91081 (+30:54:38.9) 11.77 USNO-V
bright star 3: 330.06201 (22:00:14.88) 30.92363 (+30:55:25.1) 10.36 USNO-V
bright star 4: 330.25819 (22:01:01.97) 30.88141 (+30:52:53.1) 11.33 USNO-V
bright star 5: 330.24780 (22:00:59.47) 30.75526 (+30:45:18.9) 8.56 USNO-V
bright star 6: 330.25364 (22:01:00.87) 30.75587 (+30:45:21.1) 11.28 USNO-V
bright star 7: 330.00253 (22:00:00.61) 30.86974 (+30:52:11.1) 11.93 GSC-V
bright star 8: 330.26654 (22:01:03.97) 30.76909 (+30:46:08.7) 12.00 GSC-V
Mean distance difference (CAT_DELTA) for 137 matched entries is 0.649" for 808483_g324
Mean and std. dev of mag. difference (MAG_DELTA) are 1.664 and 0.754 for 808483_g324
Found 55 entries without IDs and 1 entries that are acceptable afterglow candidates for 808483_g324.
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.
43 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=330.1180 (22:00:28.32) DEC=30.8460 (+30:50:45.6)
XRT distances are from RA=330.1333 (22:00:31.99) DEC=30.8378 (+30:50:16.2)
*** WARNING 28 per cent of entries have no IDs.
-----------------
Entry 2 in the list of sources is a candidate afterglow for 808483_g324 with 1x1 stamp
ra=330.12947 (22:00:31.07) dec=30.85714 (+30:51:25.7) +/- 1.1" mag=18.12+/-0.35
dist=70.5 REFID=165
*** The position of this source is inconsistent with the XRT position.
The position is 53.5 arc sec from the BAT position.
src: 2 distr. of nearby unmatched sources: 0 0 0 0 0
Found 9 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
330.1285 30.8530 15.3 -1 USNO-B1 19.95 18.75 19.29
330.1230 30.8574 19.9 -1 USNO-B1 12.94 10.86 11.78 *
330.1304 30.8563 4.1 -1 USNO-B1 13.01 12.38 12.66 *
330.1260 30.8594 13.4 -1 USNO-B1 20.21 18.73 19.39
330.1286 30.8529 15.7 -1 GSC2.3 18.57 20.83 99.99
330.1230 30.8574 19.9 -1 GSC2.3 99.99 99.99 11.85 *
330.1303 30.8563 4.1 -1 GSC2.3 99.99 99.99 12.70 *
330.1262 30.8596 13.5 -1 GSC2.3 99.99 21.50 18.70
330.1327 30.8592 12.4 -1 GSC2.3 19.99 99.99 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Found 2 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
330.1329 30.8378 1.2 -1 USNO-B1 20.43 19.27 19.78
330.1329 30.8378 1.1 -1 GSC2.3 18.93 21.15 19.03
The closest star is 1.10" 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 < 5",
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 808483
SRCLIST PROBLEM: srclist filled telemetry buffer
------ Start for Possible Stand-alone Circular ----
In response to GRB180204 (Swift/BAT trigger 808483) at 02:36:16 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
304 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
0.10.
------- notes for trigger 808483 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180204d10h49m44s793259usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=808483
-expid=539404901 -meonly -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/808483/
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 539404901.294 or about 2018:035:02:41:36 UT
Found 1347 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 12% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 55 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 2 source(s) in Genie image catalog. Found 1 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 19.74 mag. Found 95 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 12% of the
Genie image region. The Genie image is INCOMPLETE with 9468 null pixels.
Genie image analysis:
Found 51765.1 counts in the large background region of 4904.0 pixels or a rate
of 10.556 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 19.23 mag. for a
4-arcsec aperture.
Found 861.5 counts in the XRT position region of 204.0 pixels or a rate of
4.223 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.114 +/- 0.127 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.381 cps or 19.43 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 18.41
mag. The closest srclist source has ra= 330.1302 dec= 30.8561 mag=14.11
sep=66.62". The closest Genie source has ra= 330.1302 dec= 30.8562 mag=13.51
sep=66.95".
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?
539404901 303 U srclist found no candidates.
539404901 303 U image found no candidates.
List afterglow candidates for other finding charts.
539404689 91 WHITE srclist found no candidates.
539404689 91 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 30.83783
GRB_ERROR: 5
GRB_RA: 330.13329
IMAGE_START_TIME: 02:41:36
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT