image overlap message for exposure 2 of trigger 1072706
uvot_overlap.pl vrs. 2010-12-20b fem started at 210910d10h38m53s780735usUT
The observation of trigger 1072706 started 2021-09-10T10:17:17.7
Examining file ./1072706_g321_uvot_sky_image.fits
The exposure ID is 652961837
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (238.7636,-54.0550) with a roll angle of 289.2
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 (238.7730,-54.0550) with a radius of 3.000 arc min
This is 0.332 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 (238.7878,-54.0619) with a radius of 0.032 arc min
This is 0.948 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 2 of trigger 1072706
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210910d10h39m17s589763usUT
Observation start time is 2021-09-10T10:17:17.7
Examining file ./1072706_g321_uvot_catalog_image.fits
The exposure ID is 652961837
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 28 detected source(s) for 1072706_g321
Aspect correction adds -0.00137 degrees (-0.328 sec of time = -2.89 arc sec) to RA
Aspect correction adds 0.00036 degrees ( 1.31 arcsec) to Dec
Total aspect correction is 3.17 arcsec
Star catalogs centered at 238.7617 , -54.0530 with radius 2.58 arc min.
n_usno: 379 n_gsc: 0
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 10.71494
RA DEC Mag Color
bright star 0: 238.80655 (15:55:13.57) -54.06409 (-54:03:50.7) 11.70 USNO-R
bright star 1: 238.79818 (15:55:11.56) -54.07666 (-54:04:36.0) 10.71 USNO-V
Mean distance difference (CAT_DELTA) for 20 matched entries is 0.734" for 1072706_g321
Mean and std. dev of mag. difference (MAG_DELTA) are 2.146 and 0.595 for 1072706_g321
Found 8 entries without IDs and 7 entries that are acceptable afterglow candidates for 1072706_g321.
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.
1 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=238.7730 (15:55:05.52) DEC=-54.0550 (-54:03:18.0)
XRT distances are from RA=238.7878 (15:55:09.07) DEC=-54.0619 (-54:03:42.9)
*** WARNING 28 per cent of entries have no IDs.
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1072706_g321 with genie
ra=238.77876 (15:55:06.90) dec=-54.05273 (-54:03:09.8) +/- 0.6" mag=17.96+/-0.16
dist=38.2 REFID=13 major=1.0 minor=0.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 14.7 arc sec from the BAT position.
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
238.7734 -54.0551 14.2 -1 USNO-B1 19.88 18.81 19.29
238.7782 -54.0548 7.4 -1 USNO-B1 99.99 19.37 99.99
238.7780 -54.0497 11.2 -1 USNO-B1 99.99 19.44 99.99
238.7795 -54.0525 1.7 -1 USNO-B1 15.52 14.04 14.70 *
238.7843 -54.0484 19.4 -1 USNO-B1 20.14 19.47 19.77
238.7863 -54.0558 19.4 -1 USNO-B1 17.20 16.10 16.59
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 2 in the list of sources is a candidate afterglow for 1072706_g321 with genie
ra=238.78082 (15:55:07.40) dec=-54.05198 (-54:03:07.1) +/- 0.6" mag=17.99+/-0.16
dist=38.7 REFID=12 major=1.0 minor=0.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 19.8 arc sec from the BAT position.
Found 6 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
238.7734 -54.0551 19.3 -1 USNO-B1 19.88 18.81 19.29
238.7782 -54.0548 11.5 -1 USNO-B1 99.99 19.37 99.99
238.7780 -54.0497 10.3 -1 USNO-B1 99.99 19.44 99.99
238.7795 -54.0525 3.4 -1 USNO-B1 15.52 14.04 14.70 *
238.7843 -54.0484 14.8 -1 USNO-B1 20.14 19.47 19.77
238.7863 -54.0558 18.0 -1 USNO-B1 17.20 16.10 16.59
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 6 in the list of sources is a candidate afterglow for 1072706_g321 with genie
ra=238.77662 (15:55:06.39) dec=-54.04699 (-54:02:49.2) +/- 0.6" mag=17.94+/-0.16
dist=58.7 REFID=9 major=1.1 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 29.8 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
238.7780 -54.0497 10.0 -1 USNO-B1 99.99 19.44 99.99
238.7755 -54.0464 3.1 -1 USNO-B1 14.60 13.14 13.79 *
238.7773 -54.0444 9.5 -1 USNO-B1 19.08 18.01 18.49
238.7843 -54.0484 17.0 -1 USNO-B1 20.14 19.47 19.77
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 7 in the list of sources is a candidate afterglow for 1072706_g321 with genie
ra=238.77410 (15:55:05.78) dec=-54.04570 (-54:02:44.5) +/- 0.7" mag=18.71+/-0.18
dist=65.2 REFID=7 major=0.9 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 33.6 arc sec from the BAT position.
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
238.7780 -54.0497 16.4 -1 USNO-B1 99.99 19.44 99.99
238.7755 -54.0464 4.0 -1 USNO-B1 14.60 13.14 13.79
238.7773 -54.0444 8.3 -1 USNO-B1 19.08 18.01 18.49
238.7747 -54.0410 17.1 -1 USNO-B1 19.34 17.91 18.55
238.7753 -54.0407 18.0 -1 USNO-B1 17.94 16.69 17.25
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 11 in the list of sources is a candidate afterglow for 1072706_g321 with genie
ra=238.77105 (15:55:05.05) dec=-54.07168 (-54:04:18.1) +/- 0.7" mag=18.94+/-0.19
dist=49.9 REFID=25 major=0.9 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 60.2 arc sec from the BAT position.
Found 7 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
238.7679 -54.0672 17.5 -1 USNO-B1 99.99 20.00 99.99
238.7658 -54.0703 12.1 -1 USNO-B1 17.80 16.83 17.26
238.7719 -54.0721 2.2 -1 USNO-B1 17.52 16.16 16.76 *
238.7740 -54.0731 7.9 -1 USNO-B1 16.23 14.95 15.52
238.7633 -54.0743 18.8 -1 USNO-B1 20.96 16.14 18.28
238.7631 -54.0746 19.8 -1 USNO-B1 19.80 17.43 18.48
238.7755 -54.0759 17.8 -1 USNO-B1 18.25 17.13 17.63
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 16 in the list of sources is a candidate afterglow for 1072706_g321 with genie
ra=238.76119 (15:55:02.69) dec=-54.07475 (-54:04:29.1) +/- 0.6" mag=17.74+/-0.15
dist=72.7 REFID=27 major=1.1 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 75.4 arc sec from the BAT position.
Found 7 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
238.7658 -54.0703 18.9 -1 USNO-B1 17.80 16.83 17.26
238.7554 -54.0739 12.5 -1 USNO-B1 17.09 14.26 15.51
238.7633 -54.0743 4.8 -1 USNO-B1 20.96 16.14 18.28
238.7631 -54.0746 4.1 -1 USNO-B1 19.80 17.43 18.48
238.7620 -54.0747 1.7 -1 USNO-B1 16.75 15.42 16.01 *
238.7631 -54.0752 4.3 -1 USNO-B1 19.29 18.12 18.64
238.7580 -54.0782 14.2 -1 USNO-B1 14.63 13.89 14.22
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 22 in the list of sources is a candidate afterglow for 1072706_g321 with genie
ra=238.75095 (15:55:00.23) dec=-54.07755 (-54:04:39.2) +/- 0.6" mag=17.29+/-0.15
dist=96.0 REFID=1 major=1.1 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 93.6 arc sec from the BAT position.
This source is near the edge of image (0.954)
Found 9 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
238.7491 -54.0722 19.6 -1 USNO-B1 19.85 18.23 18.95
238.7554 -54.0739 16.3 -1 USNO-B1 17.09 14.26 15.51
238.7580 -54.0782 15.1 -1 USNO-B1 14.63 13.89 14.22
238.7458 -54.0772 11.1 -1 USNO-B1 19.65 18.16 18.82
238.7510 -54.0785 3.3 -1 USNO-B1 15.45 14.17 14.74 *
238.7440 -54.0771 14.7 -1 USNO-B1 16.91 15.64 16.20
238.7518 -54.0791 5.8 -1 USNO-B1 17.15 16.04 16.53
238.7510 -54.0797 7.8 -1 USNO-B1 15.11 14.11 14.55
238.7542 -54.0816 16.3 -1 USNO-B1 99.99 18.17 99.99
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
238.7890 -54.0616 2.8 -1 USNO-B1 18.27 17.10 17.62
238.7918 -54.0617 8.5 -1 USNO-B1 20.30 18.89 19.52
The closest star is 2.75" away.
List UVOT sources within 10" of the XRT position:
There are 25978.922 counts in the bkg source region of 5581.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.655 counts/pixel (5-sig UL in 4" is 19.63 mag) for 1072706_g321
There are 968.45209 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 4.818 counts/pixel for 1072706_g321
XRT source is too far (56.8661918387195") from center -- do not compute local background.
There are 1 candidate(s) outside XRT error circle with mag < 19.62
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.18, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1072706_652961837_210910d10h39m17s589763usUT_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(238.7636,-54.0550,45")
fk5;-circle(238.76681978722,-54.0546555342591,6")
fk5;-circle(238.778757841979,-54.0527320711181,6")
fk5;-circle(238.780818000141,-54.0519815525572,6")
fk5;-circle(238.767427603703,-54.049829762544,6")
fk5;-circle(238.761365330242,-54.0558063632899,6")
fk5;-circle(238.785989782167,-54.055853161573,6")
fk5;-circle(238.776617330565,-54.0469890886344,6")
fk5;-circle(238.774103926308,-54.0456988962711,6")
fk5;-circle(238.753192209074,-54.0676498219656,6")
Region file: 1072706_652961837_210910d10h39m17s589763usUT_xrt.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(238.78779,-54.06192,8")
image paragraph message for exposure 2 of trigger 1072706
SRCLIST PROBLEM: srclist filled telemetry buffer
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB210910 (Swift/BAT trigger 1072706) at 10:11:55 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
294 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the
XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The
8'x8' region for the list of sources generated on-board covers 100% of the XRT
error circle. The list of sources is typically complete to about 18.0 mag. No
correction has been made for the large, but uncertain, extinction expected.
------- notes for trigger 1072706 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210910d10h39m24s252874usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1072706
-expid=652961837 -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/1072706/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for bat position. Unreliable extinction found for
xrt position. XRT position found for srclist. XRT position found for Genie
image. BAT position found.
UVOT exposure began at MET 652961837.67996 or about 2021:253:10:17:12 UT
Found 3604 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 33% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 62 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.12 mag.
Found 28 source(s) in Genie image catalog. Found 8 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.18 mag. Found 375 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
39% of the Genie image region.
Genie image analysis:
Found 25978.9 counts in the large background region of 5581.0 pixels or a rate
of 4.655 counts/pixel in a radius of 45.0 arcsec. Based on this background, the
typical 5-sigma UL at a random point in the Genie image is 19.47 mag. for a
4-arcsec aperture.
Found 968.5 counts in the XRT position region of 201.0 pixels or a rate of
4.818 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is 0.131 +/- 0.127 (1-sigma) cps or
20.39 mag and a range from 19.65 to 23.97 mag. The 3-sigma UL at the XRT
position is 0.511 cps or 18.91 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.21 mag. The closest
srclist source has ra= 238.8036 dec= -54.0629 mag=17.39 sep=33.48". The closest
Genie source has ra= 238.7860 dec= -54.0558 mag=18.60 sep=22.17".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the image data with mag < 19.62 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=238.77410
(15:55:05.78), DEC=-54.04570 (-54:02:44.5) (J2000). It has a mag of 18.71. It
is 33.6" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 250 seconds with the U filter starting
294 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 15:55:05.78 = 238.77410
DEC(J2000) = -54:02:44.5 = -54.04570
with a 90%-confidence error radius of about 0.69 arc sec. The estimated
magnitude is 18.71 with a 1-sigma error of about 0.18. No correction has been
made for the large, but uncertain, extinction expected.
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?
652961837 293 U srclist found no candidates.
652961837 293 U image found no candidates.
List afterglow candidates for other finding charts.
652961625 81 WHITE srclist found no candidates.
652961625 81 WHITE image found no candidates.
652962417 873 WHITE srclist found no candidates.
652962417 873 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -54.06192
GRB_ERROR: 5
GRB_RA: 238.78779
IMAGE_START_TIME: 10:17:12
MAGNITUDE: 18.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT