image overlap message for exposure 1 of trigger 1015873
uvot_overlap.pl vrs. 2010-12-20b fem started at 210104d21h55m27s686160usUT
The observation of trigger 1015873 started 2021-01-04T11:28:36.2
Examining file ./1015873_g96_uvot_sky_image.fits
The exposure ID is 631452516
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (103.7700,64.6814) with a roll angle of 357.4
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 (103.7050,64.6610) with a radius of 3.000 arc min
This is 2.068 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 5.97 sq. arc min or 0.21 of the BAT error circle
The XRT error circle is centered at (103.7728,64.6761) with a radius of 0.023 arc min
This is 0.328 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 1 of trigger 1015873
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210104d21h55m32s452959usUT
Observation start time is 2021-01-04T11:28:36.2
Examining file ./1015873_g96_uvot_catalog_image.fits
The exposure ID is 631452516
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 13 detected source(s) for 1015873_g96
Aspect correction adds 0.00143 degrees (0.344 sec of time = 2.21 arc sec) to RA
Aspect correction adds 0.00076 degrees ( 2.72 arcsec) to Dec
Total aspect correction is 3.51 arcsec
Star catalogs centered at 103.7709 , 64.6760 with radius 2.67 arc min.
n_usno: 89 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 10 matched entries is 0.222" for 1015873_g96
Mean and std. dev of mag. difference (MAG_DELTA) are 0.874 and 0.422 for 1015873_g96
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 1015873_g96.
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=103.7050 (06:54:49.20) DEC=64.6610 (+64:39:39.6)
XRT distances are from RA=103.7728 (06:55:05.47) DEC=64.6761 (+64:40:33.8)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1015873_g96 with genie
ra=103.77189 (06:55:05.25) dec=64.67627 (+64:40:34.6) +/- 0.6" mag=14.60+/-0.14
dist=1.6 REFID=8 major=1.0 minor=1.0 flag=2 (blended)
Found 3 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
103.7782 64.6724 17.0 -1 USNO-B1 20.94 99.99 99.99
103.7792 64.6718 19.7 -1 USNO-B1 20.90 19.63 20.19
103.7846 64.6768 19.7 -1 USNO-B1 16.30 15.20 15.69
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1015873_g96 with genie
ra=103.76980 (06:55:04.75) dec=64.68006 (+64:40:48.2) +/- 0.6" mag=18.58+/-0.15
dist=15.1 REFID=11 major=4.2 minor=2.3 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 121.1 arc sec from the BAT position.
Found 2 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
103.7753 64.6823 11.8 -1 USNO-B1 20.90 19.50 20.12
103.7810 64.6812 17.7 -1 USNO-B1 12.73 12.03 12.34
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 4.2
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1015873_g96 with genie
ra=103.77178 (06:55:05.23) dec=64.68065 (+64:40:50.3) +/- 0.7" mag=19.57+/-0.16
dist=16.6 REFID=9 major=1.7 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 124.8 arc sec from the BAT position.
Found 2 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
103.7753 64.6823 8.1 -1 USNO-B1 20.90 19.50 20.12
103.7810 64.6812 14.3 -1 USNO-B1 12.73 12.03 12.34
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 1.7
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=103.77189 (06:55:05.25) dec=64.67627 (+64:40:34.6) +/- 0.6" mag=14.60+/-0.14 dist=1.6 REFID=8 flag=2
There are 49353.730 counts in the bkg source region of 5771.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 8.552 counts/pixel (5-sig UL in 4" is 20.18 mag) for 1015873_g96
There are 10692.920 counts in the src source region of 50.000000 pixels.
Rate in src region with 4 arcsec radius is 213.858 counts/pixel for 1015873_g96
There are 8145.4253 counts in the cand_src_bkg source region of 977.00000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 8.337 counts/pixel (5-sig UL in 4" is 20.20 mag) for 1015873_g96
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 20.74, 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: 1015873_631452516_210104d21h55m32s452959usUT_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(103.7700,64.6814,45")
fk5;-circle(103.771890951423,64.6762712854085,6")
fk5;-circle(103.769796258609,64.6800592725595,6")
fk5;-circle(103.784394279569,64.6768296864048,6")
fk5;-circle(103.771776888702,64.6806485435527,6")
fk5;-circle(103.781241089857,64.6811491062818,6")
fk5;-circle(103.798673531782,64.6852213764655,6")
Region file: 1015873_631452516_210104d21h55m32s452959usUT_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(103.771890951423,64.6762712854085,4")
Region file: 1015873_631452516_210104d21h55m32s452959usUT_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(103.771890951423,64.6762712854085,25")
fk5;-circle(103.771890951423,64.6762712854085,15")
fk5;-circle(103.769796258609,64.6800592725595,6")
fk5;-circle(103.784394279569,64.6768296864048,6")
fk5;-circle(103.771776888702,64.6806485435527,6")
fk5;-circle(103.781241089857,64.6811491062818,6")
image paragraph message for exposure 1 of trigger 1015873
------ Start for Possible Stand-alone Circular ----
In response to GRB210104 (Swift/BAT trigger 1015873) at 11:26:59 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 70 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 06:55:05.25 = 103.77189
DEC(J2000) = +64:40:34.6 = 64.67627
with a 90%-confidence error radius of about 0.61 arc sec. This position is 1.6
arc sec. from the center of the XRT error circle. The estimated magnitude is
14.60 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.04.
------- notes for trigger 1015873 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210104d21h55m37s795600usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1015873
-expid=631452516 -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/1015873/
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 631452516.2412 or about 2021:004:11:28:31 UT
Found 413 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 90 sources in
srclist catalog. Found 40 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 13 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 3 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.74 mag. Found 85 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 8% 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?
631452516 70 WHITE 103.77188 64.67611 15.52/19.2 1.4 srclist Yes
631452516 70 WHITE 103.77189 64.67627 14.60/20.7 1.6 image Yes
List afterglow candidates for other finding charts.
631452728 282 U 103.77182 64.67635 16.13/18.1 7.6 srclist Yes
631452728 282 U 103.77190 64.67621 15.19/20.5 7.1 image Yes
631453306 860 WHITE 103.77146 64.67600 17.82/19.2 6.2 srclist Yes
631453306 860 WHITE 103.77190 64.67629 16.47/20.8 7.4 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 64.67627
GRB_ERROR: 0.61
GRB_RA: 103.77189
IMAGE_START_TIME: 11:28:31
MAGNITUDE: 14.60
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT