srclist overlap message for exposure 1 of trigger 821881
uvot_overlap.pl vrs. 2010-12-20b fem started at 180404d04h58m28s707770usUT
The observation of trigger 821881 started 2018-04-04T00:47:26.2
Examining file ./821881_g110_uvot_sky_srclist.fits
The exposure ID is 544495646
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (83.5581,-37.1665) with a roll angle of 286.5
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 (83.5640,-37.1700) with a radius of 3.000 arc min
This is 0.354 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 (83.5490,-37.1681) with a radius of 0.033 arc min
This is 0.443 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
srclist afterglow message for exposure 1 of trigger 821881
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180404d04h58m30s463977usUT
Observation start time is 2018-04-04T00:47:26.2
Examining file ./821881_g110_uvot_catalog_srclist.fits
The exposure ID is 544495646
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 61 detected source(s) for 821881_g110
Aspect correction adds -0.00041 degrees (-0.099 sec of time = -1.18 arc sec) to RA
Aspect correction adds 0.00001 degrees ( 0.03 arcsec) to Dec
Total aspect correction is 1.18 arcsec
Star catalogs centered at 83.5618 , -37.1740 with radius 5.85 arc min.
n_usno: 386 n_gsc: 352
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 10.458
RA DEC Mag Color
bright star 0: 83.57802 (05:34:18.73) -37.11924 (-37:07:09.3) 11.30 USNO-V
bright star 1: 83.47678 (05:33:54.43) -37.17425 (-37:10:27.3) 11.85 USNO-V
bright star 2: 83.45499 (05:33:49.20) -37.17146 (-37:10:17.2) 10.46 GSC-F
Mean distance difference (CAT_DELTA) for 48 matched entries is 0.582" for 821881_g110
Mean and std. dev of mag. difference (MAG_DELTA) are 1.153 and 0.684 for 821881_g110
Found 13 entries without IDs and 2 entries that are acceptable afterglow candidates for 821881_g110.
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.
10 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=83.5640 (05:34:15.36) DEC=-37.1700 (-37:10:12.0)
XRT distances are from RA=83.5490 (05:34:11.77) DEC=-37.1681 (-37:10:05.1)
-----------------
Entry 2 in the list of sources is a candidate afterglow for 821881_g110 with 3x3 stamp
ra=83.54865 (05:34:11.68) dec=-37.16782 (-37:10:04.1) +/- 1.1" mag=19.78+/-0.35
dist=1.5 REFID=49
src: 2 distr. of nearby unmatched sources: 0 0 0 0 0
Found 7 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
83.5534 -37.1713 18.5 -1 USNO-B1 20.44 20.01 20.20
83.5475 -37.1694 6.4 -1 USNO-B1 20.55 19.62 20.03
83.5447 -37.1653 14.5 -1 USNO-B1 21.11 20.71 20.89
83.5448 -37.1650 15.0 -1 USNO-B1 20.59 20.64 20.62
83.5534 -37.1712 18.2 -1 GSC2.3 20.00 21.97 99.99
83.5475 -37.1694 6.4 -1 GSC2.3 19.52 21.76 99.99
83.5448 -37.1651 14.7 -1 GSC2.3 20.16 99.99 99.99
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 mag
-----------------
Entry 36 in the list of sources is a candidate afterglow for 821881_g110 with 3x3 stamp
ra=83.49940 (05:33:59.86) dec=-37.15578 (-37:09:20.8) +/- 1.1" mag=20.14+/-0.35
dist=149.2 REFID=47
*** The position of this source is inconsistent with the XRT position.
The position is 192.3 arc sec from the BAT position.
src: 36 distr. of nearby unmatched sources: 1 0 0 0 0
Found 6 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
83.4995 -37.1551 2.5 -1 USNO-B1 23.68 20.67 22.01 *
83.4985 -37.1561 2.8 -1 USNO-B1 18.66 17.84 18.21 *
83.4980 -37.1569 5.5 -1 USNO-B1 19.97 19.12 19.50
83.4996 -37.1535 8.3 -1 USNO-B1 99.99 20.25 99.99
83.4987 -37.1560 2.3 -1 GSC2.3 17.96 18.74 99.99 *
83.4993 -37.1533 9.0 -1 GSC2.3 20.17 22.31 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
83.5475 -37.1694 6.3 -1 USNO-B1 20.55 19.62 20.03
83.5475 -37.1694 6.3 -1 GSC2.3 19.52 21.76 99.99
The closest star is 6.35" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=83.54865 (05:34:11.68) dec=-37.16782 (-37:10:04.1) +/- 1.1" mag=19.78+/-0.35 dist=1.5 REFID=49
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 19.22, 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 1 of trigger 821881
------ Start for Possible Stand-alone Circular ----
In response to GRB180404 (Swift/BAT trigger 821881) at 00:45:35 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 89 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 05:34:11.63 = 83.54846
DEC(J2000) = -37:10:03.9 = -37.16774
with a 90%-confidence error radius of about 0.65 arc sec. This position is 2.1
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.40 with a 1-sigma error of about 0.16. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.04.
------- notes for trigger 821881 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180404d04h58m33s992457usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=821881
-expid=544495646 -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/821881/
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 544495646.18612 or about 2018:094:00:47:21 UT
Found 382 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 61 sources in
srclist catalog. Found 13 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 8 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.86 mag. Found 69 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 8% of the Genie image region.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 83.5486 dec= -37.1678 mag=19.78 sep=1.46".
The closest srclist source has ra= 83.5486 dec= -37.1678 mag=19.78 sep=1.46".
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?
544495646 89 WHITE 83.54865 -37.16782 19.78/19.2 1.5 srclist Yes
544495646 89 WHITE 83.54846 -37.16774 19.40/20.9 2.1 image Yes
List afterglow candidates for other finding charts.
544495858 301 U 83.54880 -37.16776 19.29/18.1 2.1 srclist Yes
544495858 301 U 83.54876 -37.16790 18.80/20.8 1.6 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -37.16774
GRB_ERROR: 0.65
GRB_RA: 83.54846
IMAGE_START_TIME: 00:47:21
MAGNITUDE: 19.40
MAG_ERROR: 0.16
MESSAGE_TYPE: ACK
SOURCE: XRT