image overlap message for exposure 2 of trigger 882252
uvot_overlap.pl vrs. 2010-12-20b fem started at 190106d15h27m12s221231usUT
The observation of trigger 882252 started 2019-01-06T13:40:10.3
Examining file ./882252_g325_uvot_sky_image.fits
The exposure ID is 568474810
The exposure time is 249.924 (seconds)
The filter is U.
The uvot region is centered at (29.8776,23.8444) with a roll angle of 253.4
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 (29.8860,23.8570) with a radius of 3.000 arc min
This is 0.882 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
The XRT error circle is centered at (29.8800,23.8454) with a radius of 0.030 arc min
This is 0.145 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
image afterglow message for exposure 2 of trigger 882252
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190106d15h27m30s390365usUT
Observation start time is 2019-01-06T13:40:10.3
Examining file ./882252_g325_uvot_catalog_image.fits
The exposure ID is 568474810
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 6 detected source(s) for 882252_g325
Aspect correction adds 0.00019 degrees (0.047 sec of time = 0.64 arc sec) to RA
Aspect correction adds 0.00013 degrees ( 0.48 arcsec) to Dec
Total aspect correction is 0.80 arcsec
Star catalogs centered at 29.8787 , 23.8499 with radius 2.20 arc min.
n_usno: 33 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 5 matched entries is 0.266" for 882252_g325
Mean and std. dev of mag. difference (MAG_DELTA) are 1.086 and 0.318 for 882252_g325
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 882252_g325.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=29.8860 (01:59:32.64) DEC=23.8570 (+23:51:25.2)
XRT distances are from RA=29.8800 (01:59:31.21) DEC=23.8454 (+23:50:43.6)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 882252_g325 with genie
ra=29.87991 (01:59:31.18) dec=23.84552 (+23:50:43.9) +/- 0.6" mag=15.87+/-0.14
dist=0.5 REFID=6 major=1.3 minor=1.1 flag=0
Found 0 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)
uvot_check_outside found 14 of 14 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=29.87991 (01:59:31.18) dec=23.84552 (+23:50:43.9) +/- 0.6" mag=15.87+/-0.14 dist=0.5 REFID=6 flag=0
There are 19158.475 counts in the bkg source region of 6086.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.148 counts/pixel (5-sig UL in 4" is 19.84 mag) for 882252_g325
There are 1943.4467 counts in the src source region of 49.000000 pixels.
Rate in src region with 4 arcsec radius is 39.662 counts/pixel for 882252_g325
There are 3972.1411 counts in the cand_src_bkg source region of 1242.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 3.198 counts/pixel (5-sig UL in 4" is 19.83 mag) for 882252_g325
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 20.40, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 882252_568474810_190106d15h27m30s390365usUT_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(29.8776,23.8444,45")
fk5;-circle(29.8799116772876,23.8455215534393,6")
fk5;-circle(29.8731412891745,23.8528315801113,6")
Region file: 882252_568474810_190106d15h27m30s390365usUT_cand_src.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(29.8799116772876,23.8455215534393,4")
Region file: 882252_568474810_190106d15h27m30s390365usUT_cand_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(29.8799116772876,23.8455215534393,25")
fk5;-circle(29.8799116772876,23.8455215534393,15")
image paragraph message for exposure 2 of trigger 882252
------ Start for Possible Stand-alone Circular ----
In response to GRB190106 (Swift/BAT trigger 882252) at 13:34:44 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
303 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 01:59:31.18 = 29.87991
DEC(J2000) = +23:50:43.9 = 23.84552
with a 90%-confidence error radius of about 0.61 arc sec. This position is 0.5
arc sec. from the center of the XRT error circle. The estimated magnitude is
15.87 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.09.
------- notes for trigger 882252 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190106d15h27m36s754327usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=882252
-expid=568474810 -meonly -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/882252/
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 568474810.2578 or about 2019:006:13:40:05 UT
Found 164 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 14 sources in
srclist catalog. Found 2 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 6 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
20.40 mag. Found 29 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 4% of the Genie image region.
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?
568474810 303 U 29.87965 23.84545 16.87/18.1 1.3 srclist Yes
568474810 303 U 29.87991 23.84552 15.87/20.4 0.5 image Yes
List afterglow candidates for other finding charts.
568474597 90 WHITE 29.87984 23.84555 17.09/19.2 0.8 srclist Yes
568474597 90 WHITE 29.87993 23.84555 16.45/20.6 0.5 image Yes
568475365 858 WHITE 29.88001 23.84578 *17.8/19.2 3.8 srclist Yes
568475365 858 WHITE 29.87991 23.84546 16.97/19.9 2.9 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 23.84552
GRB_ERROR: 0.61
GRB_RA: 29.87991
IMAGE_START_TIME: 13:40:05
MAGNITUDE: 15.87
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT