image overlap message for exposure 3 of trigger 1102281
uvot_overlap.pl vrs. 2010-12-20b fem started at 220412d18h41m31s085796usUT
The observation of trigger 1102281 started 2022-04-12T06:51:42.4
Examining file ./1102281_g891_uvot_sky_image.fits
The exposure ID is 671439102
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (123.9637,30.3231) 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 0.234 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 1.193 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 3 of trigger 1102281
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220412d18h41m55s462892usUT
Observation start time is 2022-04-12T06:51:42.4
Examining file ./1102281_g891_uvot_catalog_image.fits
The exposure ID is 671439102
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 5 detected source(s) for 1102281_g891
Aspect correction adds 0.00118 degrees (0.283 sec of time = 3.67 arc sec) to RA
Aspect correction adds 0.00077 degrees ( 2.76 arcsec) to Dec
Total aspect correction is 4.59 arcsec
Star catalogs centered at 123.9649 , 30.3226 with radius 2.34 arc min.
n_usno: 57 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 4 matched entries is 0.657" for 1102281_g891
Mean and std. dev of mag. difference (MAG_DELTA) are 1.021 and 0.317 for 1102281_g891
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1102281_g891.
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 4 in the list of sources is a candidate afterglow for 1102281_g891 with genie
ra=123.94355 (08:15:46.45) dec=30.30994 (+30:18:35.8) +/- 1.1" mag=21.00+/-0.32
dist=140.1 REFID=1 major=1.2 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 87.5 arc sec from the BAT position.
This source is near the edge of image (0.982)
Found 1 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 9.9 -1 USNO-B1 14.33 13.73 13.99
*** If XRT position is correct, then this is NOT the afterglow
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 73478.789 counts in the bkg source region of 5971.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 12.306 counts/pixel (5-sig UL in 4" is 19.99 mag) for 1102281_g891
There are 2371.6191 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 11.918 counts/pixel for 1102281_g891
XRT source is too far (71.4366194770603") from center -- do not compute local background.
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.54, 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_671439102_220412d18h41m55s462892usUT_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(123.9637,30.3231,45")
fk5;-circle(123.960568080196,30.3275886059862,6")
fk5;-circle(123.973632957978,30.3292933625125,6")
fk5;-circle(123.955355862289,30.3183679191258,6")
Region file: 1102281_671439102_220412d18h41m55s462892usUT_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 3 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 150 seconds with the White filter
starting 863 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 19.6 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 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 220412d18h42m00s900217usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1102281
-expid=671439102 -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 671439102.37872 or about 2022:102:06:51:37 UT
Found 653 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 88 sources in
srclist catalog. Found 23 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 5 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 20.54 mag. Found 53 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 73478.8 counts in the large background region of 5971.0 pixels or a rate
of 12.306 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 19.81 mag. for a
4-arcsec aperture.
Found 2371.6 counts in the XRT position region of 199.0 pixels or a rate of
11.918 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.515 +/- 0.330 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.991 cps or 19.62 mag. The closest srclist
source has ra= 123.9737 dec= 30.3293 mag=16.65 sep=50.96". The closest Genie
source has ra= 123.9559 dec= 30.3396 mag=21.24 sep=39.33".
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?
671439102 862 WHITE srclist found no candidates.
671439102 862 WHITE 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.
671438523 283 U srclist found no candidates.
671438523 283 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 30.34258
GRB_ERROR: 9.25
GRB_RA: 123.96808
IMAGE_START_TIME: 06:51:37
MAGNITUDE: 19.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT