image overlap message for exposure 2 of trigger 1156572
uvot_overlap.pl vrs. 2010-12-20b fem started at 230228d17h11m06s934259usUT
The observation of trigger 1156572 started 2023-02-28T06:05:46.2
Examining file ./1156572_g895_uvot_sky_image.fits
The exposure ID is 699257146
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (18.3994,44.4828) with a roll angle of 222.8
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 (18.4030,44.4890) with a radius of 3.000 arc min
This is 0.403 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 (18.3781,44.4829) with a radius of 0.035 arc min
This is 0.913 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1156572
find_uvot_ag.pl vrs. 2020-10-30 fem started at 230228d17h11m19s833552usUT
Observation start time is 2023-02-28T06:05:46.2
Examining file ./1156572_g895_uvot_catalog_image.fits
The exposure ID is 699257146
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 11 detected source(s) for 1156572_g895
Aspect correction adds -0.00091 degrees (-0.218 sec of time = -2.33 arc sec) to RA
Aspect correction adds -0.00098 degrees (-3.51 arcsec) to Dec
Total aspect correction is 4.21 arcsec
Star catalogs centered at 18.3992 , 44.4866 with radius 2.32 arc min.
n_usno: 62 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 9 matched entries is 0.553" for 1156572_g895
Mean and std. dev of mag. difference (MAG_DELTA) are 0.543 and 0.439 for 1156572_g895
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1156572_g895.
Acceptable entries have no ID, XRT distances < 5.25", 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=18.4030 (01:13:36.72) DEC=44.4890 (+44:29:20.4)
XRT distances are from RA=18.3781 (01:13:30.75) DEC=44.4829 (+44:28:58.5)
-----------------
Entry 7 in the list of sources is a candidate afterglow for 1156572_g895 with genie
ra=18.37636 (01:13:30.33) dec=44.47857 (+44:28:42.8) +/- 0.6" mag=17.58+/-0.14
dist=16.3 REFID=7 major=4.7 minor=2.2 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 78.1 arc sec from the BAT position.
Found 4 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
18.3820 44.4758 17.4 -1 USNO-B1 14.65 14.14 14.37
18.3789 44.4743 16.6 -1 USNO-B1 20.60 18.37 19.36
18.3783 44.4745 15.3 -1 USNO-B1 19.64 17.95 18.70
18.3745 44.4742 16.3 -1 USNO-B1 12.99 11.59 12.21 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 10 in the list of sources is a candidate afterglow for 1156572_g895 with genie
ra=18.37185 (01:13:29.24) dec=44.47654 (+44:28:35.6) +/- 0.8" mag=20.21+/-0.21
dist=28.0 REFID=6 major=0.8 minor=0.5 flag=2 (blended)
*** The position of this source is inconsistent with the XRT position.
The position is 91.7 arc sec from the BAT position.
This source is near the edge of image (0.887)
Found 3 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
18.3789 44.4743 19.9 -1 USNO-B1 20.60 18.37 19.36
18.3783 44.4745 17.9 -1 USNO-B1 19.64 17.95 18.70
18.3745 44.4742 10.8 -1 USNO-B1 12.99 11.59 12.21 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 80133.875 counts in the bkg source region of 5770.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 13.888 counts/pixel (5-sig UL in 4" is 19.92 mag) for 1156572_g895
There are 2912.9890 counts in the xrt source region of 208.00000 pixels.
Rate in xrt region with 8 arcsec radius is 14.005 counts/pixel for 1156572_g895
XRT source is too far (54.6328304972151") 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 20.48, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1156572_699257146_230228d17h11m19s833552usUT_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(18.3994,44.4828,45")
fk5;-circle(18.40141110777,44.49393568177,6")
fk5;-circle(18.3957903371605,44.4937973812442,6")
fk5;-circle(18.4133861716639,44.4855966415239,6")
fk5;-circle(18.4042160471062,44.4777029808382,6")
fk5;-circle(18.4070718451987,44.4731986007564,6")
Region file: 1156572_699257146_230228d17h11m19s833552usUT_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(18.37813,44.48292,8")
image paragraph message for exposure 2 of trigger 1156572
SRCLIST PROBLEM: srclist filled telemetry buffer
------ Start for Possible Stand-alone Circular ----
In response to GRB230228 (Swift/BAT trigger 1156572) at 05:50:50 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 865 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
0.085.
------- notes for trigger 1156572 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 230228d17h11m24s240548usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1156572
-expid=699257146 -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/1156572/
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 699257146.24394 or about 2023:059:06:05:41 UT
Found 1424 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 11% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 42 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 11 source(s) in Genie image catalog. Found 2 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.48 mag. Found 58 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
7% of the Genie image region.
Genie image analysis:
Found 80133.9 counts in the large background region of 5770.0 pixels or a rate
of 13.888 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 19.75 mag. for a
4-arcsec aperture.
Found 2913.0 counts in the XRT position region of 208.0 pixels or a rate of
14.005 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is 0.162 +/- 0.366 (1-sigma) cps or
21.58 mag and a range from 20.30 to 99.99 mag. The 3-sigma UL at the XRT
position is 1.261 cps or 19.35 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 19.15 mag. The closest
srclist source has ra= 18.3821 dec= 44.4754 mag=15.43 sep=28.99". The closest
Genie source has ra= 18.3764 dec= 44.4786 mag=17.58 sep=16.32".
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?
699257146 ???? WHITE srclist found no candidates.
699257146 ???? WHITE image found no candidates.
List afterglow candidates for other finding charts.
699256402 ???? WHITE srclist found no candidates.
699256402 ???? WHITE image found no candidates.
699256616 ???? U srclist found no candidates.
699256616 ???? U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 44.48292
GRB_ERROR: 5.25
GRB_RA: 18.37813
IMAGE_START_TIME: 06:05:41
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT