image overlap message for exposure 1 of trigger 1046782
uvot_overlap.pl vrs. 2010-12-20b fem started at 210505d04h54m48s531774usUT
The observation of trigger 1046782 started 2021-05-04T13:58:57.9
Examining file ./1046782_g641829537_uvot_sky_image.fits
The exposure ID is 641829537
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (222.3765,-30.5484) with a roll angle of 178.1
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 (222.3792,-30.5565) with a radius of 2.100 arc min
This is 0.510 arc min from the center of the uvot region
The area of the BAT error circle is 13.85 sq. arc min
The UVOT/BAT overlap is 7.07 sq. arc min or 0.51 of the BAT error circle
The XRT error circle is centered at (222.3912,-30.5334) with a radius of 0.033 arc min
This is 1.174 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 1 of trigger 1046782
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210505d04h54m52s441551usUT
Observation start time is 2021-05-04T13:58:57.9
Examining file ./1046782_g641829537_uvot_catalog_image.fits
The exposure ID is 641829537
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 30 detected source(s) for 1046782_g641829537
Aspect correction adds -0.00078 degrees (-0.188 sec of time = -2.42 arc sec) to RA
Aspect correction adds -0.00016 degrees (-0.58 arcsec) to Dec
Total aspect correction is 2.49 arcsec
Star catalogs centered at 222.3777 , -30.5474 with radius 2.51 arc min.
n_usno: 137 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.93034
RA DEC Mag Color
bright star 0: 222.35941 (14:49:26.26) -30.54590 (-30:32:45.3) 11.93 USNO-V
Mean distance difference (CAT_DELTA) for 26 matched entries is 0.594" for 1046782_g641829537
Mean and std. dev of mag. difference (MAG_DELTA) are 0.827 and 0.428 for 1046782_g641829537
Found 6 entries without IDs and 3 entries that are acceptable afterglow candidates for 1046782_g641829537.
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.
3 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=222.3792 (14:49:31.00) DEC=-30.5565 (-30:33:23.5)
XRT distances are from RA=222.3912 (14:49:33.88) DEC=-30.5334 (-30:32:00.4)
-----------------
Entry 10 in the list of sources is a candidate afterglow for 1046782_g641829537 with genie
ra=222.35820 (14:49:25.97) dec=-30.55669 (-30:33:24.1) +/- 0.6" mag=17.99+/-0.14
dist=132.1 REFID=18 major=2.5 minor=1.5 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 65.0 arc sec from the BAT position.
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
222.3564 -30.5517 18.9 -1 USNO-B1 20.36 18.98 19.59
222.3555 -30.5580 9.7 -1 USNO-B1 18.85 17.09 17.87
222.3536 -30.5576 14.5 -1 USNO-B1 19.92 18.20 18.96
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.5
-----------------
Entry 12 in the list of sources is a candidate afterglow for 1046782_g641829537 with genie
ra=222.36479 (14:49:27.55) dec=-30.54563 (-30:32:44.3) +/- 0.6" mag=18.92+/-0.15
dist=92.8 REFID=15 major=3.6 minor=2.3 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 59.4 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
222.3663 -30.5454 4.6 -1 USNO-B1 21.93 18.57 20.06
222.3649 -30.5468 4.2 -1 USNO-B1 19.88 18.99 19.39
222.3643 -30.5462 2.5 -1 USNO-B1 20.01 18.15 18.98 *
222.3594 -30.5459 16.7 -1 USNO-B1 12.89 11.16 11.93 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 26 in the list of sources is a candidate afterglow for 1046782_g641829537 with genie
ra=222.39172 (14:49:34.01) dec=-30.53388 (-30:32:02.0) +/- 0.7" mag=19.87+/-0.18
dist=2.3 REFID=6 major=1.0 minor=0.9 flag=0
This source is near the edge of image (0.857)
Found 1 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
222.3865 -30.5354 17.2 -1 USNO-B1 21.07 18.70 19.76
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 5.25" 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=222.39172 (14:49:34.01) dec=-30.53388 (-30:32:02.0) +/- 0.7" mag=19.87+/-0.18 dist=2.3 REFID=6 flag=0
There are 63100.613 counts in the bkg source region of 5627.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 11.214 counts/pixel (5-sig UL in 4" is 20.04 mag) for 1046782_g641829537
There are 745.13873 counts in the src source region of 50.000000 pixels.
Rate in src region with 4 arcsec radius is 14.903 counts/pixel for 1046782_g641829537
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 20.59, 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: 1046782_641829537_210505d04h54m52s441551usUT_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(222.3765,-30.5484,45")
fk5;-circle(222.362906373354,-30.5527066471028,6")
fk5;-circle(222.364789992294,-30.5456253408979,6")
fk5;-circle(222.367016983957,-30.5594633828675,6")
fk5;-circle(222.37231157206,-30.5403335278658,6")
fk5;-circle(222.375012137443,-30.5401007934866,6")
fk5;-circle(222.371888750724,-30.5609497462439,6")
fk5;-circle(222.380900171561,-30.547691418376,6")
fk5;-circle(222.380109890445,-30.5566148012362,6")
fk5;-circle(222.38866857657,-30.5550805645246,6")
Region file: 1046782_641829537_210505d04h54m52s441551usUT_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(222.391724421478,-30.5338821719851,4")
image paragraph message for exposure 1 of trigger 1046782
------ Start for Possible Stand-alone Circular ----
In response to GRB210504 (Swift/BAT trigger 1046782) at 13:54:53 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 217 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 14:49:34.01 = 222.39172
DEC(J2000) = -30:32:02.0 = -30.53388
with a 90%-confidence error radius of about 0.70 arc sec. This position is 2.3
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.87 with a 1-sigma error of about 0.18. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.139.
------- notes for trigger 1046782 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210505d04h54m57s434318usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1046782
-expid=641829537 -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/1046782/
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 641829537.93136 or about 2021:124:13:58:52 UT
Found 813 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 13% of the srclist region. Found 153 sources in
srclist catalog. Found 55 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 30 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 6 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.59 mag. Found 133 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 14% of the Genie image region. The
closest srclist source has ra= 222.3842 dec= -30.5315 mag=19.53 sep=22.69".
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?
641829537 217 WHITE srclist found no candidates.
641829537 217 WHITE 222.39172 -30.53388 19.87/20.6 2.3 image Yes
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -30.53388
GRB_ERROR: 0.70
GRB_RA: 222.39172
IMAGE_START_TIME: 13:58:52
MAGNITUDE: 19.87
MAG_ERROR: 0.18
MESSAGE_TYPE: ACK
SOURCE: XRT