image overlap message for exposure 2 of trigger 953689
uvot_overlap.pl vrs. 2010-12-20b fem started at 200201d04h04m29s836859usUT
The observation of trigger 953689 started 2020-01-31T22:46:30.2
Examining file ./953689_g314_uvot_sky_image.fits
The exposure ID is 602203590
The exposure time is 32.954 (seconds)
The filter is U.
The uvot region is centered at (3.0919,51.1118) with a roll angle of 227.0
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 (3.0950,51.1240) with a radius of 3.000 arc min
This is 0.739 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 (3.0944,51.1168) with a radius of 0.025 arc min
This is 0.311 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
image afterglow message for exposure 2 of trigger 953689
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200201d04h04m42s800022usUT
Observation start time is 2020-01-31T22:46:30.2
Examining file ./953689_g314_uvot_catalog_image.fits
The exposure ID is 602203590
The exposure is 32.954 sec.
The bin size is 2 pixels
The filter is U
There are 10 detected source(s) for 953689_g314
Aspect correction adds -0.00005 degrees (-0.012 sec of time = -0.11 arc sec) to RA
Aspect correction adds -0.00059 degrees (-2.11 arcsec) to Dec
Total aspect correction is 2.12 arcsec
Star catalogs centered at 3.0967 , 51.1133 with radius 2.48 arc min.
n_usno: 187 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.07198
RA DEC Mag Color
bright star 0: 3.08962 (00:12:21.51) 51.08237 (+51:04:56.5) 11.07 USNO-V
Mean distance difference (CAT_DELTA) for 8 matched entries is 0.881" for 953689_g314
Mean and std. dev of mag. difference (MAG_DELTA) are 0.404 and 0.361 for 953689_g314
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 953689_g314.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA= 3.0950 (00:12:22.80) DEC=51.1240 (+51:07:26.4)
XRT distances are from RA= 3.0944 (00:12:22.65) DEC=51.1168 (+51:07:00.4)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 953689_g314 with genie
ra=3.09404 (00:12:22.57) dec=51.11655 (+51:06:59.6) +/- 0.6" mag=16.08+/-0.16
dist=1.1 REFID=7 major=0.9 minor=0.9 flag=0
Found 2 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
3.0865 51.1174 17.3 -1 USNO-B1 20.59 19.11 19.76
3.0921 51.1212 17.4 -1 USNO-B1 20.57 19.59 20.03
uvot_check_outside found 11 of 11 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 8 in the list of sources is a candidate afterglow for 953689_g314 with genie
ra=3.08461 (00:12:20.31) dec=51.09619 (+51:05:46.3) +/- 1.2" mag=19.11+/-0.37
dist=77.3 REFID=10 major=1.2 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 102.8 arc sec from the BAT position.
Found 4 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
3.0832 51.0992 11.1 -1 USNO-B1 20.41 18.82 19.53
3.0841 51.0967 2.3 -1 USNO-B1 19.90 18.93 19.36 *
3.0782 51.0986 16.9 -1 USNO-B1 20.41 19.32 19.80
3.0866 51.0955 5.1 -1 USNO-B1 99.99 18.88 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are 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=3.09404 (00:12:22.57) dec=51.11655 (+51:06:59.6) +/- 0.6" mag=16.08+/-0.16 dist=1.1 REFID=7 flag=0
There are 2585.4102 counts in the bkg source region of 5886.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 0.439 counts/pixel (5-sig UL in 4" is 18.71 mag) for 953689_g314
There are 223.74512 counts in the src source region of 49.000000 pixels.
Rate in src region with 4 arcsec radius is 4.566 counts/pixel for 953689_g314
There are 598.34601 counts in the cand_src_bkg source region of 1242.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 0.482 counts/pixel (5-sig UL in 4" is 18.66 mag) for 953689_g314
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 19.27, 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: 953689_602203590_200201d04h04m42s800022usUT_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(3.0919,51.1118,45")
fk5;-circle(3.09404011596669,51.1165497777085,6")
fk5;-circle(3.1068612374506,51.1147486116501,6")
fk5;-circle(3.07695576787298,51.1189633803101,6")
fk5;-circle(3.08277768699602,51.1048544655797,6")
Region file: 953689_602203590_200201d04h04m42s800022usUT_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(3.09404011596669,51.1165497777085,4")
Region file: 953689_602203590_200201d04h04m42s800022usUT_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(3.09404011596669,51.1165497777085,25")
fk5;-circle(3.09404011596669,51.1165497777085,15")
fk5;-circle(3.1068612374506,51.1147486116501,6")
image paragraph message for exposure 2 of trigger 953689
------ Start for Possible Stand-alone Circular ----
In response to GRB200131 (Swift/BAT trigger 953689) at 22:41:15 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 33 seconds with the U filter starting
289 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 00:12:22.57 = 3.09404
DEC(J2000) = +51:06:59.6 = 51.11655
with a 90%-confidence error radius of about 0.65 arc sec. This position is 1.1
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.08 with a 1-sigma error of about 0.16. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.17.
------- notes for trigger 953689 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200201d04h04m46s676919usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=953689
-expid=602203590 -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/953689/
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 602203590.23214 or about 2020:031:22:46:25 UT
Found 1116 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 20% of the srclist region. Found 78 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
17.02 mag.
Found 10 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 2 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
19.27 mag. Found 183 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 20% of the Genie image region.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 3.0943 dec= 51.1167 mag=18.77 sep=0.29".
The closest srclist source has ra= 3.0943 dec= 51.1167 mag=18.77 sep=0.29".
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?
602203590 289 U 3.09427 51.11673 18.77/17.0 0.3 srclist Yes
602203590 289 U 3.09404 51.11655 16.08/19.3 1.1 image Yes
List afterglow candidates for other finding charts.
602203377 76 WHITE 3.09412 51.11677 16.39/19.2 0.6 srclist Yes
602203377 76 WHITE 3.09403 51.11678 15.44/20.6 0.8 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 51.11655
GRB_ERROR: 0.65
GRB_RA: 3.09404
IMAGE_START_TIME: 22:46:25
MAGNITUDE: 16.08
MAG_ERROR: 0.16
MESSAGE_TYPE: ACK
SOURCE: XRT