image overlap message for exposure 2 of trigger 1093693
uvot_overlap.pl vrs. 2010-12-20b fem started at 220118d12h22m19s205320usUT
The observation of trigger 1093693 started 2022-01-18T12:18:18.3
Examining file 1093693_g894_uvot_sky_image.fits
The exposure ID is 664201098
The exposure time is 90.959 (seconds)
The filter is WHITE.
*** Warning -- found 12815 null pixels in the image.
The uvot region is centered at (245.1415,-15.8464) with a roll angle of 103.9
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 (245.1360,-15.8460) with a radius of 3.000 arc min
This is 0.316 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 (245.1369,-15.8272) with a radius of 0.078 arc min
This is 1.179 arc min from the center of the uvot region
The area of the XRT error circle is 0.019 sq. arc min
The UVOT/XRT overlap is 0.019 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1093693
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220118d12h22m20s728639usUT
Observation start time is 2022-01-18T12:18:18.3
Examining file 1093693_g894_uvot_sources_image.fits
The exposure ID is 664201098
The exposure is 90.959 sec.
The bin size is 2 pixels
The filter is WHITE
There are 3 detected source(s) for 1093693_g894
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 245.1496 , -15.8383 with radius 2.11 arc min.
n_usno: 85 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 1093693_g894.
Acceptable entries have no ID, XRT distances < 11.75", 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=245.1360 (16:20:32.64) DEC=-15.8460 (-15:50:45.6)
XRT distances are from RA=245.1369 (16:20:32.86) DEC=-15.8272 (-15:49:37.9)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1093693_g894 with genie
ra=245.16418 (16:20:39.40) dec=-15.85032 (-15:51:01.1) +/- 0.7" mag=16.20+/-0.14
dist=125.9 REFID=1 major=1.4 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 98.8 arc sec from the BAT position.
Found 1 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 12 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
245.1688 -15.8487 16.9 -1 USNO-B1 19.24 18.02 18.56
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1093693_g894 with genie
ra=245.15011 (16:20:36.03) dec=-15.82629 (-15:49:34.7) +/- 1.2" mag=19.82+/-0.33
dist=45.9 REFID=2 major=1.3 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 86.1 arc sec from the BAT position.
This source is near the edge of image (0.894)
Found 2 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
245.1510 -15.8242 8.2 -1 USNO-B1 20.20 18.67 19.35 *
245.1523 -15.8238 11.8 -1 USNO-B1 20.70 19.51 20.04 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 20.25" or brighter than 12 mag
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1093693_g894 with genie
ra=245.13496 (16:20:32.39) dec=-15.83482 (-15:50:05.3) +/- 0.8" mag=18.07+/-0.16
dist=28.2 REFID=3 major=1.3 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 40.4 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
Found 1 entries in star catalog(s) within 20" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
245.1336 -15.8285 12.2 -1 USNO-B1 20.83 19.78 20.24
The closest star is 12.24" away.
List UVOT sources within 20" of the XRT position:
There are 90121.938 counts in the bkg source region of 3147.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 28.637 counts/pixel (5-sig UL in 4" is 18.99 mag) for 1093693_g894
There are 5809.3379 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 28.902 counts/pixel for 1093693_g894
XRT source is too far (70.9320854761647") from center -- do not compute local background.
There are 2 candidate(s) outside XRT error circle with mag < 18.98
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.54, XRT distances < 11.75",
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: 1093693_664201098_220118d12h22m20s728639usUT_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(245.1415,-15.8464,45")
fk5;-circle(245.134955111205,-15.8348186723241,6")
Region file: 1093693_664201098_220118d12h22m20s728639usUT_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(245.1369,-15.8272,8")
image paragraph message for exposure 2 of trigger 1093693
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no aspect solution
SRCLIST PROBLEM: no srclist afterglow info
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB220118 (Swift/BAT trigger 1093693) at 12:03:23 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 91 seconds with the White filter
starting 866 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image processing
FAILED because of no aspect solution. Results from the list of sources
generated on-board are not available at this time. No correction has been made
for the expected extinction corresponding to E(B-V) of 0.388.
------- notes for trigger 1093693 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 220118d12h22m24s408836usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1093693
-expid=664201098 -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/1093693/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 664201098.34062 or about 2022:018:12:18:13 UT
No information found about the number of stars in the star catalog for srclist
region.
THERE IS NO ASPECT SOLUTION for the image data.
Found 3 source(s) in Genie image catalog. Found 3 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 19.54 mag. Found 81 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 12% of the
Genie image region. The Genie image is INCOMPLETE with 12815 null pixels.
The closest Genie source has ra= 245.1350 dec= -15.8348 mag=18.07 sep=28.24".
This paragraph is only useful if the XRT position is grossly wrong. There are 2
candidate(s) in the image data with mag < 18.98 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=245.16418
(16:20:39.40), DEC=-15.85032 (-15:51:01.2) (J2000). It has a mag of 16.20. It
is 98.8" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 91 seconds with the White filter
starting 866 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 16:20:39.40 = 245.16418
DEC(J2000) = -15:51:01.2 = -15.85032
with a 90%-confidence error radius of about 0.75 arc sec. The estimated
magnitude is 16.20 with a 1-sigma error of about 0.14. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.388.
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?
664201098 866 WHITE srclist data are not available.
664201098 866 WHITE image found no candidates.
List afterglow candidates for other finding charts.
664200544 312 ? srclist data are not available.
664200544 312 WHITE image found no candidates.
------- Tokens for Quick GCN -------