image overlap message for exposure 2 of trigger 1104343
uvot_overlap.pl vrs. 2010-12-20b fem started at 220428d05h34m02s852521usUT
The observation of trigger 1104343 started 2022-04-27T21:06:43.9
Examining file ./1104343_g368_uvot_sky_image.fits
The exposure ID is 672786403
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (275.8785,-56.2528) 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 0.317 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 0.357 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 2 of trigger 1104343
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220428d05h34m23s086649usUT
Observation start time is 2022-04-27T21:06:43.9
Examining file ./1104343_g368_uvot_catalog_image.fits
The exposure ID is 672786403
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 33 detected source(s) for 1104343_g368
Aspect correction adds 0.00184 degrees (0.440 sec of time = 3.67 arc sec) to RA
Aspect correction adds -0.00022 degrees (-0.78 arcsec) to Dec
Total aspect correction is 3.75 arcsec
Star catalogs centered at 275.8764 , -56.2518 with radius 2.73 arc min.
n_usno: 298 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 35 matched entries is 0.661" for 1104343_g368
Mean and std. dev of mag. difference (MAG_DELTA) are 0.904 and 1.190 for 1104343_g368
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1104343_g368.
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 4 in the list of sources is a candidate afterglow for 1104343_g368 with genie
ra=275.88885 (18:23:33.32) dec=-56.25509 (-56:15:18.3) +/- 0.6" mag=17.73+/-0.15
dist=1.9 REFID=20 major=1.2 minor=1.1 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 15.5 -1 USNO-B1 15.07 13.47 14.18
275.8869 -56.2551 3.9 -1 USNO-B1 19.42 19.30 19.35
275.8863 -56.2585 13.3 -1 USNO-B1 19.10 18.37 18.69
275.8920 -56.2500 19.2 -1 USNO-B1 18.14 17.00 17.51
275.8925 -56.2504 18.4 -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=275.88885 (18:23:33.32) dec=-56.25509 (-56:15:18.3) +/- 0.6" mag=17.73+/-0.15 dist=1.9 REFID=20 flag=0
There are 15305.875 counts in the bkg source region of 5604.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.731 counts/pixel (5-sig UL in 4" is 19.92 mag) for 1104343_g368
There are 445.48090 counts in the src source region of 50.000000 pixels.
Rate in src region with 4 arcsec radius is 8.910 counts/pixel for 1104343_g368
There are 3225.2717 counts in the cand_src_bkg source region of 1070.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 3.014 counts/pixel (5-sig UL in 4" is 19.87 mag) for 1104343_g368
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 20.47, 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_672786403_220428d05h34m23s086649usUT_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(275.8785,-56.2528,45")
fk5;-circle(275.87419672312,-56.2523611737263,6")
fk5;-circle(275.866122942313,-56.2482432908541,6")
fk5;-circle(275.877630343917,-56.2503020568304,6")
fk5;-circle(275.88095809448,-56.2556845490642,6")
fk5;-circle(275.888850423765,-56.2550921906737,6")
fk5;-circle(275.865170142047,-56.241763359179,6")
fk5;-circle(275.873123829783,-56.265992931735,6")
fk5;-circle(275.892562621836,-56.2506479633458,6")
Region file: 1104343_672786403_220428d05h34m23s086649usUT_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(275.888850423765,-56.2550921906737,4")
Region file: 1104343_672786403_220428d05h34m23s086649usUT_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(275.888850423765,-56.2550921906737,25")
fk5;-circle(275.888850423765,-56.2550921906737,15")
fk5;-circle(275.87419672312,-56.2523611737263,6")
fk5;-circle(275.877630343917,-56.2503020568304,6")
fk5;-circle(275.88095809448,-56.2556845490642,6")
fk5;-circle(275.892562621836,-56.2506479633458,6")
image paragraph message for exposure 2 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 250 seconds with the U filter starting
339 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:23:33.32 = 275.88885
DEC(J2000) = -56:15:18.3 = -56.25509
with a 90%-confidence error radius of about 0.63 arc sec. This position is 1.9
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.73 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 220428d05h34m29s084429usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1104343
-expid=672786403 -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 672786403.90426 or about 2022:117:21:06:38 UT
Found 3203 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 14 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 33 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
20.47 mag. Found 294 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= 275.8806 dec= -56.2557 mag=15.11 sep=15.08".
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?
672786403 339 U srclist found no candidates.
672786403 339 U 275.88885 -56.25509 17.73/20.5 1.9 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
672786934 870 WHITE srclist found no candidates.
672786934 870 WHITE 275.88869 -56.25508 19.05/20.7 0.2 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -56.25509
GRB_ERROR: 0.63
GRB_RA: 275.88885
IMAGE_START_TIME: 21:06:38
MAGNITUDE: 17.73
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT