srclist overlap message for exposure 1 of trigger 895257
uvot_overlap.pl vrs. 2010-12-20b fem started at 190327d09h09m33s341390usUT
The observation of trigger 895257 started 2019-03-27T09:02:51.5
Examining file 895257_g153_uvot_sky_srclist.fits
The exposure ID is 575370171
The exposure time is undefined.
The filter is U.
The uvot region is centered at (314.7027,41.8178) with a roll angle of 116.3
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 (314.6980,41.8220) with a radius of 3.000 arc min
This is 0.330 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 (314.6953,41.7772) with a radius of 0.098 arc min
This is 2.457 arc min from the center of the uvot region
The area of the XRT error circle is 0.030 sq. arc min
The UVOT/XRT overlap is 0.030 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 1 of trigger 895257
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190327d09h09m34s616000usUT
Observation start time is 2019-03-27T09:02:51.5
Examining file 895257_g153_uvot_catalog_srclist.fits
The exposure ID is 575370171
The exposure is 249.920 sec.
The bin size is 2 pixels
The filter is U
There are 85 detected source(s) for 895257_g153
Aspect correction adds 0.00121 degrees (0.291 sec of time = 3.26 arc sec) to RA
Aspect correction adds -0.00019 degrees (-0.67 arcsec) to Dec
Total aspect correction is 3.33 arcsec
Star catalogs centered at 314.7106 , 41.8116 with radius 8.54 arc min.
n_usno: 3086 n_gsc: 0
*** WARNING -- bright star catalog has 7 entries brighter than 12 mag
The brightest has mag 6.12506
RA DEC Mag Color
bright star 0: 314.74957 (20:58:59.90) 41.87756 (+41:52:39.2) 11.05 USNO-V
bright star 1: 314.67041 (20:58:40.90) 41.87828 (+41:52:41.8) 11.64 USNO-V
bright star 2: 314.74822 (20:58:59.57) 41.89269 (+41:53:33.7) 11.42 USNO-V
bright star 3: 314.63882 (20:58:33.32) 41.88620 (+41:53:10.3) 11.21 USNO-V
bright star 4: 314.67347 (20:58:41.63) 41.70402 (+41:42:14.5) 11.39 USNO-V
bright star 5: 314.66003 (20:58:38.41) 41.70178 (+41:42:06.4) 11.87 USNO-V
bright star 6: 314.62897 (20:58:30.95) 41.93993 (+41:56:23.7) 6.13 USNO-V
Mean distance difference (CAT_DELTA) for 75 matched entries is 0.695" for 895257_g153
Mean and std. dev of mag. difference (MAG_DELTA) are 2.249 and 0.977 for 895257_g153
Found 11 entries without IDs and 1 entries that are acceptable afterglow candidates for 895257_g153.
Acceptable entries have no ID, XRT distances < 14.75", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
8 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=314.6980 (20:58:47.52) DEC=41.8220 (+41:49:19.2)
XRT distances are from RA=314.6953 (20:58:46.87) DEC=41.7772 (+41:46:37.9)
-----------------
Entry 26 in the list of sources is a candidate afterglow for 895257_g153 with 3x3 stamp
ra=314.69163 (20:58:45.99) dec=41.84329 (+41:50:35.9) +/- 1.1" mag=16.52+/-0.35
dist=238.1 REFID=62
*** The position of this source is inconsistent with the XRT position.
The position is 78.5 arc sec from the BAT position.
src: 26 distr. of nearby unmatched sources: 0 0 0 0 0
Found 6 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
314.6866 41.8393 19.8 -1 USNO-B1 99.99 19.17 99.99
314.6913 41.8427 2.2 -1 USNO-B1 15.09 12.41 13.60 *
314.6938 41.8445 7.2 -1 USNO-B1 17.28 15.24 16.15
314.6870 41.8427 12.6 -1 USNO-B1 20.01 18.38 19.11
314.6968 41.8463 17.8 -1 USNO-B1 20.24 18.62 19.34
314.6873 41.8450 13.1 -1 USNO-B1 15.08 12.60 13.70 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
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
314.6981 41.7770 7.5 -1 USNO-B1 16.73 13.82 15.12
The closest star is 7.48" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=314.69804 (20:58:47.53) dec=41.77702 (+41:46:37.3) +/- 1.1" mag=16.02+/-0.35 dist=7.4 REFID=23
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 < 14.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: /Home/eud/uvot_tdrss/swift/uvot_gcn/src_895257_XRT.reg
# Region file format: DS9 version 3.0
# find_uvot_ag.pl vrs. 2017-02-17 fem XRT
global font="helvetica 12 bold" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source=1
fk5;circle(314.6953,+41.7772,5.9") # color=red dash=0
point(314.69651,41.77701) # point=diamond 10 color=red width=2
srclist paragraph message for exposure 1 of trigger 895257
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB190327 (Swift/BAT trigger 895257) at 09:00:17 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
131 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. Results 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. The list of sources is typically
complete to about 18.0 mag. No correction has been made for the large, but
uncertain, extinction expected.
------- notes for trigger 895257 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190327d09h09m41s378359usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=895257
-expid=575370171 -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/895257/
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. XRT position found for srclist. BAT position found.
UVOT exposure began at MET 575370171.53334 or about 2019:086:09:02:46 UT
Found 3082 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 29% of the srclist region. Found 85 sources in
srclist catalog. Found 11 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 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 314.6980 dec= 41.7770 mag=16.02 sep=7.39".
The closest srclist source has ra= 314.6980 dec= 41.7770 mag=16.02 sep=7.39".
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
131 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 20:58:47.53 = 314.69804
DEC(J2000) = +41:46:37.3 = 41.77702
with a 90%-confidence error radius of about 1.10 arc sec. This position is 7.39
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.02 with a 1-sigma error of about 0.35. No correction has been made for the
large, but uncertain, extinction expected.
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?
575370171 131 U srclist found no candidates.
575370171 131 U image data are not available.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 41.77720
GRB_ERROR: 14.75
GRB_RA: 314.69530
IMAGE_START_TIME: 09:02:46
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT