image overlap message for exposure 2 of trigger 1101675
uvot_overlap.pl vrs. 2010-12-20b fem started at 220408d11h11m15s019551usUT
The observation of trigger 1101675 started 2022-04-08T05:51:58.4
Examining file ./1101675_g353_uvot_sky_image.fits
The exposure ID is 671089918
The exposure time is 249.924 (seconds)
The filter is U.
The uvot region is centered at (202.4011,47.0671) with a roll angle of 6.7
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 (202.4020,47.0610) with a radius of 3.000 arc min
This is 0.370 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 (202.4166,47.0691) with a radius of 0.033 arc min
This is 0.642 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1101675
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220408d11h11m30s145306usUT
Observation start time is 2022-04-08T05:51:58.4
Examining file ./1101675_g353_uvot_catalog_image.fits
The exposure ID is 671089918
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 1 detected source(s) for 1101675_g353
Aspect correction adds 0.00004 degrees (0.010 sec of time = 0.10 arc sec) to RA
Aspect correction adds 0.00115 degrees ( 4.14 arcsec) to Dec
Total aspect correction is 4.14 arcsec
Star catalogs centered at 202.3785 , 47.0564 with radius 2.00 arc min.
n_usno: 27 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 1 matched entries is 0.728" for 1101675_g353
Mean and std. dev of mag. difference (MAG_DELTA) are -0.200 and 0.000 for 1101675_g353
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1101675_g353.
Acceptable entries have no ID, XRT distances < 5", 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=202.4020 (13:29:36.48) DEC=47.0610 (+47:03:39.6)
XRT distances are from RA=202.4166 (13:29:39.98) DEC=47.0691 (+47:04:08.8)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 9499.0791 counts in the bkg source region of 6304.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.507 counts/pixel (5-sig UL in 4" is 20.24 mag) for 1101675_g353
There are 315.21259 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 1.592 counts/pixel for 1101675_g353
There are 1855.9127 counts in the xrt_bkg source region of 1249.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 1.486 counts/pixel (5-sig UL in 4" is 20.25 mag) for 1101675_g353
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 20.80, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1101675_671089918_220408d11h11m30s145306usUT_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(202.4011,47.0671,45")
Region file: 1101675_671089918_220408d11h11m30s145306usUT_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(202.41658,47.06911,8")
Region file: 1101675_671089918_220408d11h11m30s145306usUT_xrt_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(202.41658,47.06911,25")
fk5;-circle(202.41658,47.06911,15")
image paragraph message for exposure 2 of trigger 1101675
SRCLIST PROBLEM: srclist filled telemetry buffer
------ Start for Possible Stand-alone Circular ----
In response to GRB220408 (Swift/BAT trigger 1101675) at 05:46:04 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
325 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
0.043.
------- notes for trigger 1101675 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 220408d11h11m35s604134usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1101675
-expid=671089918 -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/1101675/
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 671089918.38796 or about 2022:098:05:51:53 UT
Found 591 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 161 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 1 source(s) in Genie image catalog. Found 0 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.80 mag. Found 23 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 3% of the
Genie image region.
Genie image analysis:
Found 9499.1 counts in the large background region of 6304.0 pixels or a rate
of 1.507 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 20.08 mag. for a
4-arcsec aperture.
Found 315.2 counts in the XRT position region of 198.0 pixels or a rate of
1.592 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.084 +/- 0.076 (1-sigma) cps or
20.87 mag and a range from 20.17 to 23.44 mag. The 3-sigma UL at the XRT
position is 0.312 cps or 19.44 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 19.43 mag. The closest
srclist source has ra= 202.4688 dec= 47.0443 mag=17.78 sep=156.06". The
closest Genie source has ra= 202.3785 dec= 47.0564 mag=19.51 sep=104.08".
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?
671089918 324 U srclist found no candidates.
671089918 324 U image found no candidates.
List afterglow candidates for other finding charts.
671089705 111 WHITE srclist found no candidates.
671089705 111 WHITE 202.41548 47.06931 20.76/20.9 2.8 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 47.06911
GRB_ERROR: 5
GRB_RA: 202.41658
IMAGE_START_TIME: 05:51:53
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT