image overlap message for exposure 2 of trigger 1102281
uvot_overlap.pl vrs. 2010-12-20b fem started at 220412d18h41m30s101279usUT
The observation of trigger 1102281 started 2022-04-12T06:42:03.8
Examining file ./1102281_g312_uvot_sky_image.fits
The exposure ID is 671438523
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (123.9643,30.3224) with a roll angle of 284.3
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 (123.9680,30.3220) with a radius of 3.000 arc min
This is 0.195 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 (123.9681,30.3426) with a radius of 0.062 arc min
This is 1.227 arc min from the center of the uvot region
The area of the XRT error circle is 0.012 sq. arc min
The UVOT/XRT overlap is 0.012 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1102281
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220412d18h41m45s467711usUT
Observation start time is 2022-04-12T06:42:03.8
Examining file ./1102281_g312_uvot_catalog_image.fits
The exposure ID is 671438523
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 4 detected source(s) for 1102281_g312
Aspect correction adds 0.00196 degrees (0.469 sec of time = 6.08 arc sec) to RA
Aspect correction adds 0.00011 degrees ( 0.41 arcsec) to Dec
Total aspect correction is 6.09 arcsec
Star catalogs centered at 123.9647 , 30.3224 with radius 2.34 arc min.
n_usno: 55 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 3 matched entries is 0.355" for 1102281_g312
Mean and std. dev of mag. difference (MAG_DELTA) are 1.472 and 0.260 for 1102281_g312
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1102281_g312.
Acceptable entries have no ID, XRT distances < 9.25", 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=123.9680 (08:15:52.32) DEC=30.3220 (+30:19:19.2)
XRT distances are from RA=123.9681 (08:15:52.34) DEC=30.3426 (+30:20:33.3)
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1102281_g312 with genie
ra=123.94318 (08:15:46.36) dec=30.31010 (+30:18:36.4) +/- 1.1" mag=20.19+/-0.31
dist=140.2 REFID=1 major=2.8 minor=1.5 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 88.2 arc sec from the BAT position.
This source is near the edge of image (0.981)
Found 2 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
123.9415 30.3078 9.7 -1 USNO-B1 14.33 13.73 13.99
123.9372 30.3093 18.9 -1 USNO-B1 20.43 18.57 19.40
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.8
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
123.9709 30.3434 9.2 -1 USNO-B1 21.50 18.75 19.97
The closest star is 9.21" away.
List UVOT sources within 10" of the XRT position:
There are 19708.754 counts in the bkg source region of 5973.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.300 counts/pixel (5-sig UL in 4" is 19.82 mag) for 1102281_g312
There are 632.49738 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.162 counts/pixel for 1102281_g312
XRT source is too far (73.5915066768088") from center -- do not compute local background.
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 20.37, XRT distances < 9.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1102281_671438523_220412d18h41m45s467711usUT_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(123.9643,30.3224,45")
fk5;-circle(123.960595459446,30.3275579107959,6")
fk5;-circle(123.973698104627,30.3292291148753,6")
fk5;-circle(123.95540532596,30.3182803104038,6")
Region file: 1102281_671438523_220412d18h41m45s467711usUT_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(123.96808,30.34258,8")
image paragraph message for exposure 2 of trigger 1102281
------ Start for Possible Stand-alone Circular ----
In response to GRB220412 (Swift/BAT trigger 1102281) at 06:36:50 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
284 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 19.2 mag. The
8'x8' region for the list of sources generated on-board covers 100% of the XRT
error circle. The list of sources is typically complete to about 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.037.
------- notes for trigger 1102281 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 220412d18h41m50s399287usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1102281
-expid=671438523 -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/1102281/
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 671438523.77934 or about 2022:102:06:41:58 UT
Found 649 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 51 sources in
srclist catalog. Found 13 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 4 source(s) in Genie image catalog. Found 1 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.37 mag. Found 51 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 6% of the
Genie image region.
Genie image analysis:
Found 19708.8 counts in the large background region of 5973.0 pixels or a rate
of 3.300 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 19.65 mag. for a
4-arcsec aperture.
Found 632.5 counts in the XRT position region of 200.0 pixels or a rate of
3.163 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.110 +/- 0.102 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.307 cps or 19.46 mag. The closest srclist
source has ra= 123.9743 dec= 30.3297 mag=19.36 sep=50.32". The closest Genie
source has ra= 123.9737 dec= 30.3292 mag=16.69 sep=51.14".
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?
671438523 283 U srclist found no candidates.
671438523 283 U image found no candidates.
List afterglow candidates for other finding charts.
671438365 125 WHITE srclist found no candidates.
671438365 125 WHITE image found no candidates.
671439102 862 WHITE srclist found no candidates.
671439102 862 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 30.34258
GRB_ERROR: 9.25
GRB_RA: 123.96808
IMAGE_START_TIME: 06:41:58
MAGNITUDE: 19.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT