image overlap message for exposure 1 of trigger 1121751
uvot_overlap.pl vrs. 2010-12-20b fem started at 220826d14h57m03s820661usUT
The observation of trigger 1121751 started 2022-08-26T11:57:22.2
Examining file ./1121751_g120_uvot_sky_image.fits
The exposure ID is 683207842
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (206.4046,-44.0366) with a roll angle of 305.9
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 (206.4310,-44.0440) with a radius of 3.000 arc min
This is 1.221 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 7.15 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (206.4108,-44.0392) with a radius of 0.037 arc min
This is 0.308 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 1 of trigger 1121751
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220826d14h57m08s438803usUT
Observation start time is 2022-08-26T11:57:22.2
Examining file ./1121751_g120_uvot_catalog_image.fits
The exposure ID is 683207842
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 30 detected source(s) for 1121751_g120
Aspect correction adds -0.00265 degrees (-0.637 sec of time = -6.87 arc sec) to RA
Aspect correction adds 0.00029 degrees ( 1.04 arcsec) to Dec
Total aspect correction is 6.94 arcsec
Star catalogs centered at 206.4028 , -44.0374 with radius 2.63 arc min.
n_usno: 220 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 29 matched entries is 0.547" for 1121751_g120
Mean and std. dev of mag. difference (MAG_DELTA) are 1.375 and 0.472 for 1121751_g120
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 1121751_g120.
Acceptable entries have no ID, XRT distances < 5.5", 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=206.4310 (13:45:43.44) DEC=-44.0440 (-44:02:38.4)
XRT distances are from RA=206.4108 (13:45:38.59) DEC=-44.0392 (-44:02:21.0)
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1121751_g120 with genie
ra=206.41049 (13:45:38.52) dec=-44.03862 (-44:02:19.0) +/- 0.6" mag=17.89+/-0.15
dist=2.1 REFID=17 major=1.3 minor=1.0 flag=0
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
206.4113 -44.0370 6.3 -1 USNO-B1 19.77 19.11 19.40
206.4128 -44.0338 18.4 -1 USNO-B1 20.90 19.99 20.40
206.4139 -44.0402 10.5 -1 USNO-B1 18.68 18.33 18.49
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
-----------------
Entry 9 in the list of sources is a candidate afterglow for 1121751_g120 with genie
ra=206.41919 (13:45:40.61) dec=-44.05455 (-44:03:16.4) +/- 0.7" mag=19.70+/-0.19
dist=59.5 REFID=29 major=1.1 minor=0.6 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 46.0 arc sec from the BAT position.
This source is near the edge of image (0.940)
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
206.4231 -44.0526 12.3 -1 USNO-B1 20.28 18.89 19.51
206.4196 -44.0557 4.3 -1 USNO-B1 17.59 17.16 17.35 *
206.4249 -44.0544 14.9 -1 USNO-B1 18.63 18.55 18.59
206.4168 -44.0594 18.5 -1 USNO-B1 20.01 19.20 19.56
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
-----------------
Entry 26 in the list of sources is a candidate afterglow for 1121751_g120 with genie
ra=206.38838 (13:45:33.21) dec=-44.06248 (-44:03:44.9) +/- 0.8" mag=20.22+/-0.24
dist=102.0 REFID=1 major=1.0 minor=0.3 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 127.0 arc sec from the BAT position.
This source is near the edge of image (1.010)
Found 5 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
206.3902 -44.0581 16.6 -1 USNO-B1 19.97 19.22 19.55
206.3872 -44.0622 3.2 -1 USNO-B1 99.99 15.51 99.99 *
206.3869 -44.0621 3.9 -1 USNO-B1 15.69 15.75 15.72 *
206.3821 -44.0616 16.5 -1 USNO-B1 19.51 18.80 19.12
206.3903 -44.0670 16.9 -1 USNO-B1 21.81 20.37 21.01
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
Found 2 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
206.4113 -44.0370 8.0 -1 USNO-B1 19.77 19.11 19.40
206.4139 -44.0402 8.9 -1 USNO-B1 18.68 18.33 18.49
The closest star is 8.03" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=206.41382 (13:45:39.32) dec=-44.04023 (-44:02:24.8) +/- 0.8" mag=20.03+/-0.21 dist=8.7 REFID=19 flag=0
Unmatched source ra=206.41049 (13:45:38.52) dec=-44.03862 (-44:02:19.0) +/- 0.6" mag=17.89+/-0.15 dist=2.1 REFID=17 flag=0
There are 1.0710623E+05 counts in the bkg source region of 5526.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 19.382 counts/pixel (5-sig UL in 4" is 19.74 mag) for 1121751_g120
There are 1786.9728 counts in the src source region of 50.000000 pixels.
Rate in src region with 4 arcsec radius is 35.739 counts/pixel for 1121751_g120
There are 21277.008 counts in the cand_src_bkg source region of 1102.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 19.308 counts/pixel (5-sig UL in 4" is 19.74 mag) for 1121751_g120
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 20.29, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1121751_683207842_220826d14h57m08s438803usUT_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(206.4046,-44.0366,45")
fk5;-circle(206.4138230152,-44.0402295701021,6")
fk5;-circle(206.410491418955,-44.0386214946374,6")
fk5;-circle(206.410180514094,-44.0455572125649,6")
fk5;-circle(206.42036933969,-44.0399389832515,6")
fk5;-circle(206.410251290397,-44.0490430667347,6")
fk5;-circle(206.400435906871,-44.0379092710632,6")
fk5;-circle(206.391775691814,-44.0319956761719,6")
fk5;-circle(206.400881013286,-44.0252991607938,6")
fk5;-circle(206.402497093611,-44.0236544514253,6")
fk5;-circle(206.385380230645,-44.0349148148461,6")
Region file: 1121751_683207842_220826d14h57m08s438803usUT_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(206.410491418955,-44.0386214946374,4")
Region file: 1121751_683207842_220826d14h57m08s438803usUT_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(206.410491418955,-44.0386214946374,25")
fk5;-circle(206.410491418955,-44.0386214946374,15")
fk5;-circle(206.4138230152,-44.0402295701021,6")
fk5;-circle(206.410180514094,-44.0455572125649,6")
fk5;-circle(206.42036933969,-44.0399389832515,6")
fk5;-circle(206.400435906871,-44.0379092710632,6")
image paragraph message for exposure 1 of trigger 1121751
------ Start for Possible Stand-alone Circular ----
In response to GRB220826 (Swift/BAT trigger 1121751) at 11:55:21 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 90 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 13:45:38.52 = 206.41049
DEC(J2000) = -44:02:19.0 = -44.03862
with a 90%-confidence error radius of about 0.62 arc sec. This position is 2.1
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.89 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.110.
------- notes for trigger 1121751 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 220826d14h57m14s713236usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1121751
-expid=683207842 -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/1121751/
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 683207842.235 or about 2022:238:11:57:17 UT
Found 1314 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 22% of the srclist region. Found 160 sources in
srclist catalog. Found 29 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 30 source(s) in Genie image catalog. 2 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
20.29 mag. Found 216 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 21% of the Genie image region.
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the srclist data with mag < 18.66 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=206.47020
(13:45:52.85), DEC=-44.08192 (-44:04:54.9) (J2000). It has a mag of 18.15. It
is 167.2" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 90 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 13:45:52.85 = 206.47020
DEC(J2000) = -44:04:54.9 = -44.08192
with a 90%-confidence error radius of about 1.10 arc sec. The estimated
magnitude is 18.15 with a 1-sigma error of about 0.35. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.110.
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?
683207842 90 WHITE 206.41045 -44.03867 18.73/19.2 2.0 srclist Yes
683207842 90 WHITE 206.41049 -44.03862 17.89/20.3 2.1 image Yes
List afterglow candidates for other finding charts.
683208054 302 U srclist found no candidates.
683208054 302 U 206.41043 -44.03878 18.67/20.1 1.6 image Yes
683208611 859 ? srclist data are not available.
683208611 859 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -44.03862
GRB_ERROR: 0.62
GRB_RA: 206.41049
IMAGE_START_TIME: 11:57:17
MAGNITUDE: 17.89
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT