image overlap message for exposure 1 of trigger 1126853
uvot_overlap.pl vrs. 2010-12-20b fem started at 221009d14h18m40s425211usUT
The observation of trigger 1126853 started 2022-10-09T14:13:47.1
Examining file 1126853_g209_uvot_sky_image.fits
The exposure ID is 687017627
The exposure time is 149.857 (seconds)
The filter is WHITE.
*** Warning -- found 5475 null pixels in the image.
The uvot region is centered at (288.2588,19.7712) with a roll angle of 265.1
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 (288.2630,19.8030) with a radius of 3.000 arc min
This is 1.923 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 6.26 sq. arc min or 0.22 of the BAT error circle
The XRT error circle is centered at (288.2643,19.7712) with a radius of 0.093 arc min
This is 0.310 arc min from the center of the uvot region
The area of the XRT error circle is 0.027 sq. arc min
The UVOT/XRT overlap is 0.027 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1126853
find_uvot_ag.pl vrs. 2020-10-30 fem started at 221009d14h18m42s535715usUT
Observation start time is 2022-10-09T14:13:47.1
Examining file 1126853_g209_uvot_catalog_image.fits
The exposure ID is 687017627
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 17 detected source(s) for 1126853_g209
Aspect correction adds -0.00042 degrees (-0.101 sec of time = -1.43 arc sec) to RA
Aspect correction adds -0.00032 degrees (-1.15 arcsec) to Dec
Total aspect correction is 1.83 arcsec
Star catalogs centered at 288.2589 , 19.7714 with radius 2.26 arc min.
n_usno: 195 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 16 matched entries is 0.360" for 1126853_g209
Mean and std. dev of mag. difference (MAG_DELTA) are 1.896 and 0.519 for 1126853_g209
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1126853_g209.
Acceptable entries have no ID, XRT distances < 14", 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=288.2630 (19:13:03.12) DEC=19.8030 (+19:48:10.8)
XRT distances are from RA=288.2643 (19:13:03.43) DEC=19.7712 (+19:46:16.3)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1126853_g209 with genie
ra=288.26452 (19:13:03.49) dec=19.77350 (+19:46:24.6) +/- 0.6" mag=16.63+/-0.14
dist=8.3 REFID=5 major=1.0 minor=0.9 flag=0
Found 7 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
288.2600 19.7727 15.5 -1 USNO-B1 16.46 14.41 15.32
288.2631 19.7731 5.1 -1 USNO-B1 20.54 17.05 18.60
288.2625 19.7749 8.4 -1 USNO-B1 20.63 17.80 19.05
288.2643 19.7715 7.1 -1 USNO-B1 20.56 18.48 19.41
288.2680 19.7765 16.0 -1 USNO-B1 20.47 17.95 19.07
288.2663 19.7787 19.5 -1 USNO-B1 99.99 18.14 99.99
288.2684 19.7763 16.5 -1 USNO-B1 20.67 16.91 18.58
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" 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
288.2631 19.7731 7.9 -1 USNO-B1 20.54 17.05 18.60
288.2643 19.7715 1.2 -1 USNO-B1 20.56 18.48 19.41
The closest star is 1.20" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=288.26452 (19:13:03.49) dec=19.77350 (+19:46:24.6) +/- 0.6" mag=16.63+/-0.14 dist=8.3 REFID=5 flag=0
There are 58254.082 counts in the bkg source region of 5524.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 10.546 counts/pixel (5-sig UL in 4" is 20.07 mag) for 1126853_g209
There are 3358.9951 counts in the src source region of 52.000000 pixels.
Rate in src region with 4 arcsec radius is 64.596 counts/pixel for 1126853_g209
There are 11440.744 counts in the cand_src_bkg source region of 1091.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 10.486 counts/pixel (5-sig UL in 4" is 20.07 mag) for 1126853_g209
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 20.63, XRT distances < 14",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1126853_687017627_221009d14h18m42s535715usUT_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(288.2588,19.7712,45")
fk5;-circle(288.264522748833,19.7735035444994,6")
fk5;-circle(288.260002485152,19.7726718429063,6")
fk5;-circle(288.269223290649,19.7692488618018,6")
fk5;-circle(288.265822540605,19.7632419795277,6")
fk5;-circle(288.269403740416,19.7631686581696,6")
fk5;-circle(288.253632201613,19.7664202468834,6")
fk5;-circle(288.260796416497,19.7834248036289,6")
fk5;-circle(288.248923524862,19.7744512791526,6")
fk5;-circle(288.244373068554,19.7696927987889,6")
Region file: 1126853_687017627_221009d14h18m42s535715usUT_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(288.264522748833,19.7735035444994,4")
Region file: 1126853_687017627_221009d14h18m42s535715usUT_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(288.264522748833,19.7735035444994,25")
fk5;-circle(288.264522748833,19.7735035444994,15")
fk5;-circle(288.260002485152,19.7726718429063,6")
fk5;-circle(288.269223290649,19.7692488618018,6")
image paragraph message for exposure 1 of trigger 1126853
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
Catalogued source 1.2" from XRT position may affect AG photometry.
------ Start for Possible Stand-alone Circular ----
In response to GRB221009 (Swift/BAT trigger 1126853) at 14:10:17 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 179 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 19:13:03.48 = 288.26452
DEC(J2000) = +19:46:24.6 = 19.77350
with a 90%-confidence error radius of about 0.61 arc sec. This position is 8.3
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.63 with a 1-sigma error of about 0.14. No correction has been made for the
large, but uncertain, extinction expected.
------- notes for trigger 1126853 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 221009d14h18m47s213738usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1126853
-expid=687017627 -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/1126853/
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 687017627.09264 or about 2022:282:14:13:42 UT
Found 1582 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 27% of the srclist region. Found 143 sources in
srclist catalog. Found 10 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 17 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
20.63 mag. Found 191 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 25% of the Genie image region. The
Genie image is INCOMPLETE with 5475 null pixels.
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?
687017627 179 WHITE 288.26454 19.77357 17.33/19.2 8.6 srclist Yes
687017627 179 WHITE 288.26452 19.77350 16.63/20.6 8.3 image Yes
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 19.77350
GRB_ERROR: 0.61
GRB_RA: 288.26452
IMAGE_START_TIME: 14:13:42
MAGNITUDE: 16.63
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT