image overlap message for exposure 2 of trigger 1056757
uvot_overlap.pl vrs. 2010-12-20b fem started at 210620d05h35m24s331772usUT
The observation of trigger 1056757 started 2021-06-20T00:05:40.5
Examining file ./1056757_g374_uvot_sky_image.fits
The exposure ID is 645840340
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (319.7157,33.8653) with a roll angle of 47.5
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 (319.7130,33.8600) with a radius of 3.000 arc min
This is 0.347 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 (319.7185,33.8500) with a radius of 0.035 arc min
This is 0.929 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1056757
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210620d05h35m40s040685usUT
Observation start time is 2021-06-20T00:05:40.5
Examining file ./1056757_g374_uvot_catalog_image.fits
The exposure ID is 645840340
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 28 detected source(s) for 1056757_g374
Aspect correction adds 0.00104 degrees (0.250 sec of time = 3.12 arc sec) to RA
Aspect correction adds 0.00079 degrees ( 2.84 arcsec) to Dec
Total aspect correction is 4.22 arcsec
Star catalogs centered at 319.7162 , 33.8599 with radius 2.77 arc min.
n_usno: 274 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.5379
RA DEC Mag Color
bright star 0: 319.74187 (21:18:58.05) 33.85312 (+33:51:11.2) 11.54 USNO-V
Mean distance difference (CAT_DELTA) for 29 matched entries is 0.417" for 1056757_g374
Mean and std. dev of mag. difference (MAG_DELTA) are 1.168 and 0.890 for 1056757_g374
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1056757_g374.
Acceptable entries have no ID, XRT distances < 5.25", 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=319.7130 (21:18:51.12) DEC=33.8600 (+33:51:36.0)
XRT distances are from RA=319.7185 (21:18:52.44) DEC=33.8500 (+33:51:00.1)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1056757_g374 with genie
ra=319.71831 (21:18:52.39) dec=33.85043 (+33:51:01.5) +/- 0.6" mag=15.54+/-0.14
dist=1.5 REFID=24 major=1.0 minor=1.0 flag=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
319.7187 33.8552 17.3 -1 USNO-B1 19.28 17.44 18.26
319.7148 33.8531 14.1 -1 USNO-B1 20.18 18.59 19.30
319.7204 33.8538 13.8 -1 USNO-B1 18.73 17.34 17.96
319.7142 33.8529 15.2 -1 USNO-B1 20.23 18.66 19.36
319.7203 33.8533 11.9 -1 USNO-B1 20.42 17.73 18.93
319.7227 33.8466 19.1 -1 USNO-B1 17.77 16.45 17.04
uvot_check_outside found 12 of 12 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=319.71831 (21:18:52.39) dec=33.85043 (+33:51:01.5) +/- 0.6" mag=15.54+/-0.14 dist=1.5 REFID=24 flag=0
There are 15610.706 counts in the bkg source region of 5842.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.672 counts/pixel (5-sig UL in 4" is 19.93 mag) for 1056757_g374
There are 2482.1833 counts in the src source region of 49.000000 pixels.
Rate in src region with 4 arcsec radius is 50.657 counts/pixel for 1056757_g374
source too far from center -- do not compute local background.
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 20.49, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1056757_645840340_210620d05h35m40s040685usUT_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(319.7157,33.8653,45")
fk5;-circle(319.720515362303,33.8537899493033,6")
fk5;-circle(319.709768351146,33.8533725261637,6")
fk5;-circle(319.715437968754,33.86038121446,6")
fk5;-circle(319.707003572951,33.8675798136028,6")
fk5;-circle(319.711969344616,33.8718972005624,6")
fk5;-circle(319.714673765325,33.8783820120088,6")
Region file: 1056757_645840340_210620d05h35m40s040685usUT_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(319.718311519043,33.8504262468864,4")
image paragraph message for exposure 2 of trigger 1056757
------ Start for Possible Stand-alone Circular ----
In response to GRB210619 (Swift/BAT trigger 1056757) at 23:59:25 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
347 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 21:18:52.39 = 319.71831
DEC(J2000) = +33:51:01.5 = 33.85043
with a 90%-confidence error radius of about 0.61 arc sec. This position is 1.5
arc sec. from the center of the XRT error circle. The estimated magnitude is
15.54 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.173.
------- notes for trigger 1056757 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210620d05h35m45s186978usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1056757
-expid=645840340 -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/1056757/
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 645840340.51838 or about 2021:171:00:05:35 UT
Found 2876 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 27% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 36 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 28 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
20.49 mag. Found 270 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 24% 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?
645840340 347 U 319.71816 33.85037 16.40/18.1 1.6 srclist Yes
645840340 347 U 319.71831 33.85043 15.54/20.5 1.5 image Yes
List afterglow candidates for other finding charts.
645840128 135 WHITE 319.71822 33.85037 14.96/19.2 1.5 srclist Yes
645840128 135 WHITE 319.71831 33.85044 14.71/20.7 1.6 image Yes
645840850 857 WHITE 319.71828 33.85057 17.46/19.2 0.6 srclist Yes
645840850 857 WHITE 319.71831 33.85048 16.72/20.7 0.6 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 33.85043
GRB_ERROR: 0.61
GRB_RA: 319.71831
IMAGE_START_TIME: 00:05:35
MAGNITUDE: 15.54
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT