image overlap message for exposure 3 of trigger 1104343
uvot_overlap.pl vrs. 2010-12-20b fem started at 220428d05h34m03s765304usUT
The observation of trigger 1104343 started 2022-04-27T21:15:34.7
Examining file ./1104343_g899_uvot_sky_image.fits
The exposure ID is 672786934
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (275.8800,-56.2535) with a roll angle of 107.2
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 (275.8690,-56.2530) with a radius of 3.000 arc min
This is 0.367 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 (275.8881,-56.2554) with a radius of 0.042 arc min
This is 0.296 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 3 of trigger 1104343
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220428d05h34m36s651646usUT
Observation start time is 2022-04-27T21:15:34.7
Examining file ./1104343_g899_uvot_catalog_image.fits
The exposure ID is 672786934
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 42 detected source(s) for 1104343_g899
Aspect correction adds 0.00190 degrees (0.455 sec of time = 3.79 arc sec) to RA
Aspect correction adds -0.00039 degrees (-1.39 arcsec) to Dec
Total aspect correction is 4.04 arcsec
Star catalogs centered at 275.8812 , -56.2532 with radius 2.71 arc min.
n_usno: 297 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 45 matched entries is 0.645" for 1104343_g899
Mean and std. dev of mag. difference (MAG_DELTA) are 0.844 and 1.099 for 1104343_g899
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1104343_g899.
Acceptable entries have no ID, XRT distances < 6.25", 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=275.8690 (18:23:28.56) DEC=-56.2530 (-56:15:10.8)
XRT distances are from RA=275.8881 (18:23:33.15) DEC=-56.2554 (-56:15:19.5)
-----------------
Entry 6 in the list of sources is a candidate afterglow for 1104343_g899 with genie
ra=275.88869 (18:23:33.28) dec=-56.25508 (-56:15:18.3) +/- 0.6" mag=19.05+/-0.15
dist=1.7 REFID=26 major=1.1 minor=1.0 flag=0
Found 5 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
275.8812 -56.2557 15.2 -1 USNO-B1 15.07 13.47 14.18
275.8869 -56.2551 3.6 -1 USNO-B1 19.42 19.30 19.35
275.8863 -56.2585 13.2 -1 USNO-B1 19.10 18.37 18.69
275.8920 -56.2500 19.3 -1 USNO-B1 18.14 17.00 17.51
275.8925 -56.2504 18.5 -1 USNO-B1 17.86 16.61 17.16
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 1 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
275.8869 -56.2551 2.7 -1 USNO-B1 19.42 19.30 19.35
The closest star is 2.69" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=275.88869 (18:23:33.28) dec=-56.25508 (-56:15:18.3) +/- 0.6" mag=19.05+/-0.15 dist=1.7 REFID=26 flag=0
There are 48430.793 counts in the bkg source region of 5306.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 9.128 counts/pixel (5-sig UL in 4" is 20.15 mag) for 1104343_g899
There are 795.14069 counts in the src source region of 50.000000 pixels.
Rate in src region with 4 arcsec radius is 15.903 counts/pixel for 1104343_g899
There are 9455.0342 counts in the cand_src_bkg source region of 992.00000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 9.531 counts/pixel (5-sig UL in 4" is 20.13 mag) for 1104343_g899
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 20.70, XRT distances < 6.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1104343_672786934_220428d05h34m36s651646usUT_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(275.8800,-56.2535,45")
fk5;-circle(275.874218629124,-56.2522547199366,6")
fk5;-circle(275.866033918212,-56.2481771648494,6")
fk5;-circle(275.877643896255,-56.2503260963431,6")
fk5;-circle(275.880973625787,-56.2556860658252,6")
fk5;-circle(275.859797141722,-56.2610959248014,6")
fk5;-circle(275.886067954996,-56.258473163797,6")
fk5;-circle(275.888686702747,-56.2550811628898,6")
fk5;-circle(275.873150332798,-56.2659847284522,6")
fk5;-circle(275.892650691575,-56.2506001320647,6")
fk5;-circle(275.886267967042,-56.2640107281209,6")
fk5;-circle(275.896321933921,-56.2611489743985,6")
Region file: 1104343_672786934_220428d05h34m36s651646usUT_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(275.888686702747,-56.2550811628898,4")
Region file: 1104343_672786934_220428d05h34m36s651646usUT_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(275.888686702747,-56.2550811628898,25")
fk5;-circle(275.888686702747,-56.2550811628898,15")
fk5;-circle(275.874218629124,-56.2522547199366,6")
fk5;-circle(275.877643896255,-56.2503260963431,6")
fk5;-circle(275.880973625787,-56.2556860658252,6")
fk5;-circle(275.886067954996,-56.258473163797,6")
fk5;-circle(275.892650691575,-56.2506001320647,6")
fk5;-circle(275.896321933921,-56.2611489743985,6")
image paragraph message for exposure 3 of trigger 1104343
Catalogued source 2.7" from XRT position may affect AG photometry.
------ Start for Possible Stand-alone Circular ----
In response to GRB220427 (Swift/BAT trigger 1104343) at 21:00:34 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 870 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:23:33.29 = 275.88869
DEC(J2000) = -56:15:18.3 = -56.25508
with a 90%-confidence error radius of about 0.64 arc sec. This position is 1.7
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.05 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.097.
------- notes for trigger 1104343 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 220428d05h34m42s752553usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1104343
-expid=672786934 -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/1104343/
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 672786934.66492 or about 2022:117:21:15:29 UT
Found 2741 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 29% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 9 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 42 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
20.70 mag. Found 293 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 27% of the Genie image region. The
closest srclist source has ra= 275.8811 dec= -56.2559 mag=14.89 sep=14.06".
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?
672786934 870 WHITE srclist found no candidates.
672786934 870 WHITE 275.88869 -56.25508 19.05/20.7 1.7 image Yes
List afterglow candidates for other finding charts.
672786245 181 WHITE srclist found no candidates.
672786245 181 WHITE 275.88882 -56.25507 17.23/20.7 1.9 image Yes
672786403 339 U srclist found no candidates.
672786403 339 U 275.88885 -56.25509 17.73/20.5 1.9 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -56.25508
GRB_ERROR: 0.64
GRB_RA: 275.88869
IMAGE_START_TIME: 21:15:29
MAGNITUDE: 19.05
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT