image overlap message for exposure 1 of trigger 1186032
uvot_overlap.pl vrs. 2010-12-20b fem started at 230819d03h49m01s859218usUT
The observation of trigger 1186032 started 2023-08-18T23:30:30.3
Examining file ./1186032_g175_uvot_sky_image.fits
The exposure ID is 714094230
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (285.8732,40.8804) with a roll angle of 314.5
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 (285.8830,40.8760) with a radius of 3.000 arc min
This is 0.517 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 (285.8878,40.8967) with a radius of 0.037 arc min
This is 1.180 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 1186032
find_uvot_ag.pl vrs. 2023-04-25a fem started at 230819d03h49m02s644040usUT
Observation start time is 2023-08-18T23:30:30.3
Examining file ./1186032_g175_uvot_catalog_image.fits
The exposure ID is 714094230
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 26 detected source(s) for 1186032_g175
Aspect correction adds -0.00210 degrees (-0.504 sec of time = -5.72 arc sec) to RA
Aspect correction adds 0.00195 degrees ( 7.03 arcsec) to Dec
Total aspect correction is 9.06 arcsec
Star catalogs centered at 285.8755 , 40.8786 with radius 2.72 arc min.
n_usno: 214 n_gsc: 223
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 24 matched entries is 0.556" for 1186032_g175
Mean and std. dev of mag. difference (MAG_DELTA) are 0.607 and 0.384 for 1186032_g175
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 1186032_g175.
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=285.8830 (19:03:31.92) DEC=40.8760 (+40:52:33.6)
XRT distances are from RA=285.8878 (19:03:33.08) DEC=40.8967 (+40:53:48.0)
-----------------
Entry 15 in the list of sources is a candidate afterglow for 1186032_g175 with genie
ra=285.88809 (19:03:33.14) dec=40.89725 (+40:53:50.1) +/- 0.6" mag=18.38+/-0.15
dist=2.2 REFID=7 major=1.7 minor=1.4 flag=0
Found 10 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
285.8851 40.8947 12.1 -1 USNO-B1 19.21 17.37 18.19
285.8918 40.8947 13.6 -1 USNO-B1 20.77 99.99 99.99
285.8851 40.8988 9.9 -1 USNO-B1 20.59 19.91 20.21
285.8822 40.9003 19.4 -1 USNO-B1 20.15 18.69 19.34
285.8930 40.8974 13.4 -1 USNO-B1 20.81 19.34 19.99
285.8851 40.8947 12.3 -1 GSC2.3 17.31 18.45 17.74
285.8919 40.8946 14.1 -1 GSC2.3 20.36 99.99 99.99
285.8851 40.8988 9.9 -1 GSC2.3 19.70 21.39 99.99
285.8822 40.9002 19.1 -1 GSC2.3 18.53 19.36 18.77
285.8930 40.8974 13.4 -1 GSC2.3 19.20 20.41 19.45
*** unacceptable major profile of 1.7
-----------------
Entry 21 in the list of sources is a candidate afterglow for 1186032_g175 with genie
ra=285.86775 (19:03:28.26) dec=40.90131 (+40:54:04.7) +/- 0.6" mag=19.41+/-0.16
dist=57.1 REFID=3 major=0.7 minor=0.5 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 100.1 arc sec from the BAT position.
This source is near the edge of image (0.931)
Found 12 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
285.8718 40.8975 17.5 -1 USNO-B1 17.14 15.45 16.20
285.8640 40.9001 11.1 -1 USNO-B1 20.98 19.72 20.28
285.8744 40.9021 18.4 -1 USNO-B1 19.73 17.93 18.73
285.8702 40.9028 8.6 -1 USNO-B1 19.78 18.02 18.80
285.8664 40.9027 6.1 -1 USNO-B1 16.48 15.17 15.75
285.8647 40.9047 14.9 -1 USNO-B1 20.88 19.91 20.34
285.8718 40.8975 17.7 -1 GSC2.3 15.45 16.39 15.61
285.8640 40.9000 11.2 -1 GSC2.3 19.61 20.76 99.99
285.8745 40.9020 18.4 -1 GSC2.3 18.02 18.73 18.17
285.8703 40.9027 8.7 -1 GSC2.3 18.00 18.81 18.48
285.8665 40.9026 5.8 -1 GSC2.3 15.15 15.77 15.15
285.8647 40.9047 14.7 -1 GSC2.3 19.91 21.18 99.99
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 23 in the list of sources is a candidate afterglow for 1186032_g175 with genie
ra=285.85029 (19:03:24.07) dec=40.86247 (+40:51:44.9) +/- 0.6" mag=18.71+/-0.15
dist=160.0 REFID=25 major=1.5 minor=0.3 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 101.5 arc sec from the BAT position.
This source is near the edge of image (1.018)
Found 10 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
285.8522 40.8671 17.4 -1 USNO-B1 20.52 19.20 19.79
285.8558 40.8614 15.4 -1 USNO-B1 20.95 19.34 20.06
285.8489 40.8638 6.2 -1 USNO-B1 99.99 18.48 99.99
285.8486 40.8636 6.1 -1 USNO-B1 99.99 18.68 99.99
285.8495 40.8624 2.1 -1 USNO-B1 18.26 16.38 17.21 *
285.8542 40.8654 14.9 -1 GSC2.3 20.26 99.99 99.99
285.8523 40.8670 17.1 -1 GSC2.3 19.03 19.98 19.33
285.8557 40.8613 15.5 -1 GSC2.3 19.24 20.90 99.99
285.8495 40.8623 2.1 -1 GSC2.3 16.31 17.52 16.83 *
285.8470 40.8588 15.9 -1 GSC2.3 20.48 99.99 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 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=285.88809 (19:03:33.14) dec=40.89725 (+40:53:50.1) +/- 0.6" mag=18.38+/-0.15 dist=2.2 REFID=7 flag=0
There are 33558.652 counts in the bkg source region of 5701.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.886 counts/pixel (5-sig UL in 4" is 20.39 mag) for 1186032_g175
There are 1878.6802 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 9.441 counts/pixel for 1186032_g175
XRT source is too far (70.8265343049498") from center -- do not compute local background.
There are 1 candidate(s) outside XRT error circle with mag < 20.38
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.94, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1186032_714094230_230819d03h49m02s644040usUT_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(285.8732,40.8804,45")
fk5;-circle(285.877571408835,40.8788525472849,6")
fk5;-circle(285.873384337301,40.8732542563008,6")
fk5;-circle(285.889587217358,40.8826058973693,6")
fk5;-circle(285.885926382155,40.8867367918188,6")
fk5;-circle(285.864839247605,40.8726947662297,6")
fk5;-circle(285.862324053325,40.8691699370939,6")
fk5;-circle(285.879817012067,40.8929625528621,6")
fk5;-circle(285.857141227089,40.8819938177663,6")
fk5;-circle(285.859333255189,40.8868057822799,6")
Region file: 1186032_714094230_230819d03h49m02s644040usUT_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(285.88783,40.89667,8")
image paragraph message for exposure 1 of trigger 1186032
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB230818 (Swift/BAT trigger 1186032) at 23:27:34 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 144 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 19.6 mag.
Results from the list of sources generated on-board are not available at this
time. No correction has been made for the expected extinction corresponding to
E(B-V) of 0.101.
------- notes for trigger 1186032 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 230819d03h49m04s114282usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1186032
-expid=714094230 -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/1186032/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 714094230.31096 or about 2023:230:23:30:25 UT
No information found about the number of stars in the star catalog for srclist
region.
Found 26 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 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.94 mag. Found 223 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 20% of the Genie image region.
Genie image analysis:
Found 33558.7 counts in the large background region of 5701.0 pixels or a rate
of 5.886 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 20.21 mag. for a
4-arcsec aperture.
Found 1878.7 counts in the XRT position region of 199.0 pixels or a rate of
9.441 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is 4.715 +/- 0.292 (1-sigma) cps or
17.92 mag and a range from 17.86 to 17.99 mag. The 3-sigma UL at the XRT
position is 5.592 cps or 17.74 mag.
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 285.8881 dec= 40.8972 mag=18.38 sep=2.21". The closest Genie
source has ra= 285.8881 dec= 40.8972 mag=18.38 sep=2.21".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the image data with mag < 20.38 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=285.86775
(19:03:28.26), DEC=40.90131 (+40:54:04.7) (J2000). It has a mag of 19.41. It is
100.1" 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 144 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 19:03:28.26 = 285.86775
DEC(J2000) = +40:54:04.7 = 40.90131
with a 90%-confidence error radius of about 0.65 arc sec. The estimated
magnitude is 19.41 with a 1-sigma error of about 0.16. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.101.
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 144 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 19:03:33.14 = 285.88809
DEC(J2000) = +40:53:50.1 = 40.89725
with a 90%-confidence error radius of about 0.62 arc sec. This position is 2.21
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.38 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.101.
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?
714094230 143 WHITE srclist data are not available.
714094230 143 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 40.89667
GRB_ERROR: 5.5
GRB_RA: 285.88783
IMAGE_START_TIME: 23:30:25
MAGNITUDE: 17.7
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT