image overlap message for exposure 1 of trigger 1100848
uvot_overlap.pl vrs. 2010-12-20b fem started at 220402d04h08m25s235203usUT
The observation of trigger 1100848 started 2022-04-02T04:00:30.3
Examining file 1100848_g347_uvot_sky_image.fits
The exposure ID is 670564830
The exposure time is 249.935 (seconds)
The filter is U.
*** Warning -- found 16712 null pixels in the image.
The uvot region is centered at (30.6880,-61.3720) with a roll angle of 339.2
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 (30.6920,-61.3760) with a radius of 3.000 arc min
This is 0.268 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 at most 4.44 sq. arc min or 0.16 of the BAT error circle
Could not find the location of an XRT error circle
image afterglow message for exposure 1 of trigger 1100848
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220402d04h08m27s207962usUT
Observation start time is 2022-04-02T04:00:30.3
Examining file 1100848_g347_uvot_sources_image.fits
The exposure ID is 670564830
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 0 detected source(s) for 1100848_g347
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 30.6759 , -61.3531 with radius 2.00 arc min.
n_usno: 24 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
*** WARNING -- no XRT distances are available.
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1100848_g347.
Acceptable entries have no ID, BAT distance < 210" or XRT distance < 20", 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=30.6920 (02:02:46.08) DEC=-61.3760 (-61:22:33.6)
XRT distances are as reported in catalog file.
There are 4510.2427 counts in the bkg source region of 1052.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.287 counts/pixel (5-sig UL in 4" is 19.67 mag) for 1100848_g347
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.67, BAT distances < 210",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Results are questionable because aspect solution FAILED.
Region file: 1100848_670564830_220402d04h08m27s207962usUT_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(30.6880,-61.3720,45")
image paragraph message for exposure 1 of trigger 1100848
IMAGE PROBLEM: partial overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB220402 (Swift/BAT trigger 1100848) at 03:54:42 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
318 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 16% of the
BAT 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 BAT
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
0.035.
------- notes for trigger 1100848 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 220402d04h08m34s871515usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1100848
-expid=670564830 -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/1100848/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
No XRT position found for srclist. No XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 670564830.32754 or about 2022:092:04:00:25 UT
Found 517 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 4% of the srclist region. Found 25 sources in
srclist catalog. Found 3 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.56 mag.
Found 0 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 19.67 mag. Found 20 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 3% of the
Genie image region. The Genie image is INCOMPLETE with 16712 null pixels.
Genie image analysis:
Found 4510.2 counts in the large background region of 1052.0 pixels or a rate
of 4.287 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 19.51 mag. for a
4-arcsec aperture.
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?
670564830 318 U srclist found no candidates.
670564830 318 U image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -61.37600
GRB_ERROR: 200
GRB_RA: 30.69200
IMAGE_START_TIME: 04:00:25
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT