srclist overlap message for exposure 2 of trigger 1104343
uvot_overlap.pl vrs. 2010-12-20b fem started at 220428d05h34m00s443478usUT
The observation of trigger 1104343 started 2022-04-27T21:06:43.9
Examining file ./1104343_g368_uvot_sky_srclist.fits
The exposure ID is 672786403
The exposure time is undefined.
The filter is U.
The uvot region is centered at (275.8785,-56.2537) with a roll angle of 107.2
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (275.8690,-56.2530) with a radius of 3.000 arc min
This is 0.320 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 28.27 sq. arc min or 1.00 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 0.337 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
srclist afterglow message for exposure 2 of trigger 1104343
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220428d05h34m19s568528usUT
Observation start time is 2022-04-27T21:06:43.9
Examining file ./1104343_g368_uvot_catalog_srclist.fits
The exposure ID is 672786403
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 190 detected source(s) for 1104343_g368
*** WARNING -- the sources have filled the available telemetry buffer (190).
srclist_overlap returned: bat_overlap 1.000
srclist_overlap returned: xrt_overlap 1.000
Dimmest detected source in 1104343_g368 has mag 18.30
Aspect correction adds 0.00173 degrees (0.414 sec of time = 3.45 arc sec) to RA
Aspect correction adds -0.00023 degrees (-0.83 arcsec) to Dec
Total aspect correction is 3.55 arcsec
Star catalogs centered at 275.8807 , -56.2497 with radius 8.75 arc min.
n_usno: 3207 n_gsc: 0
*** WARNING -- bright star catalog has 8 entries brighter than 12 mag
The brightest has mag 10.38202
RA DEC Mag Color
bright star 0: 275.81979 (18:23:16.75) -56.29654 (-56:17:47.6) 11.07 USNO-V
bright star 1: 275.99281 (18:23:58.28) -56.30686 (-56:18:24.7) 11.67 USNO-V
bright star 2: 275.81360 (18:23:15.26) -56.33584 (-56:20:09.0) 10.45 USNO-V
bright star 3: 275.93942 (18:23:45.46) -56.15503 (-56:09:18.1) 10.90 USNO-V
bright star 4: 276.03201 (18:24:07.68) -56.17641 (-56:10:35.1) 11.10 USNO-V
bright star 5: 276.07009 (18:24:16.82) -56.31836 (-56:19:06.1) 10.38 USNO-V
bright star 6: 276.10255 (18:24:24.61) -56.29457 (-56:17:40.4) 11.39 USNO-V
bright star 7: 275.96471 (18:23:51.53) -56.11371 (-56:06:49.4) 11.20 USNO-V
Mean distance difference (CAT_DELTA) for 195 matched entries is 0.911" for 1104343_g368
Mean and std. dev of mag. difference (MAG_DELTA) are 1.570 and 0.815 for 1104343_g368
Found 14 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.
8 sources matched bright stars.
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 2 in the list of sources is a candidate afterglow for 1104343_g368 with 1x1 stamp
ra=275.88027 (18:23:31.26) dec=-56.25510 (-56:15:18.4) +/- 1.1" mag=17.00+/-0.35
dist=15.8 REFID=142
*** The position of this source is inconsistent with the XRT position.
The position is 23.8 arc sec from the BAT position.
src: 2 distr. of nearby unmatched sources: 0 0 0 0 0
Found 8 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
275.8776 -56.2504 17.9 -1 USNO-B1 17.26 15.21 16.12
275.8739 -56.2522 16.6 -1 USNO-B1 18.70 17.65 18.12
275.8730 -56.2519 18.5 -1 USNO-B1 21.03 17.94 19.31
275.8812 -56.2557 2.8 -1 USNO-B1 15.07 13.47 14.18 *
275.8869 -56.2551 13.3 -1 USNO-B1 19.42 19.30 19.35
275.8737 -56.2560 13.6 -1 USNO-B1 19.77 19.00 19.34
275.8863 -56.2585 17.1 -1 USNO-B1 19.10 18.37 18.69
275.8730 -56.2585 18.9 -1 USNO-B1 19.34 19.02 19.16
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 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:
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 18.12, XRT distances < 6.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist 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 220428d05h34m25s439898usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1104343
-expid=672786403 -meonly -msg_srclist
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