image overlap message for exposure 1 of trigger 1164180
uvot_overlap.pl vrs. 2010-12-20b fem started at 230414d21h55m39s886875usUT
The observation of trigger 1164180 started 2023-04-14T16:17:05.6
Examining file ./1164180_g163_uvot_sky_image.fits
The exposure ID is 703181825
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (181.0629,53.1309) with a roll angle of 336.4
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 (181.0710,53.1270) with a radius of 3.000 arc min
This is 0.374 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 (181.0947,53.1543) with a radius of 0.037 arc min
This is 1.811 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 0.000 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1164180
find_uvot_ag.pl vrs. 2023-03-28 fem started at 230414d21h55m43s993253usUT
Observation start time is 2023-04-14T16:17:05.6
Examining file ./1164180_g163_uvot_catalog_image.fits
The exposure ID is 703181825
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 1 detected source(s) for 1164180_g163
Aspect correction adds -0.00203 degrees (-0.487 sec of time = -4.39 arc sec) to RA
Aspect correction adds 0.00175 degrees ( 6.31 arcsec) to Dec
Total aspect correction is 7.68 arcsec
*** WARNING -- access to usno-b1 catalog failed.
Star catalogs centered at 181.0493 , 53.1137 with radius 2.00 arc min.
n_usno: -1 n_gsc: 0
*** WARNING -- XRT position is outside star catalog search region.
*** WARNING -- no star catalog entries found.
-- this strongly suggests a problem with the catalogs.
-- cannot check for bright stars or nearby sources.
-- there is a high risk of false positives.
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 0 matched entries is 0.000" for 1164180_g163
Mean and std. dev of mag. difference (MAG_DELTA) are 0.000 and -1.000 for 1164180_g163
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1164180_g163.
Acceptable entries have no ID, XRT distances < 5.5", 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=181.0710 (12:04:17.04) DEC=53.1270 (+53:07:37.2)
XRT distances are from RA=181.0947 (12:04:22.73) DEC=53.1543 (+53:09:15.6)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1164180_g163 with genie
ra=181.04053 (12:04:09.73) dec=53.11252 (+53:06:45.1) +/- 1.4" mag=21.74+/-0.40
dist=190.7 REFID=1 major=1.9 minor=1.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 84.0 arc sec from the BAT position.
This source is near the edge of image (0.869)
Found 0 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)
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 1.9
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 37641.695 counts in the bkg source region of 6307.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.968 counts/pixel (5-sig UL in 4" is 20.38 mag) for 1164180_g163
Do not compute counts in XRT region because position is too far from center.
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 20.93, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1164180_703181825_230414d21h55m43s993253usUT_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(181.0629,53.1309,45")
image paragraph message for exposure 1 of trigger 1164180
IMAGE PROBLEM: no overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB230414 (Swift/BAT trigger 1164180) at 16:14:21 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 133 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 none of
the XRT error circle. 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 0.017.
------- notes for trigger 1164180 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 230414d21h55m47s177032usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1164180
-expid=703181825 -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/1164180/
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 703181825.60104 or about 2023:104:16:17:00 UT
Access to USNO star catalog FAILED. This increases the odds of a FALSE
afterglow detection. There was likely a PROBLEM with the srclist star catalog
because no stars found. Found 15 sources in srclist catalog. Found 4 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 19.22 mag.
Access to USNO star catalog FAILED. This increases the odds of a FALSE
afterglow detection. Found 1 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 20.93 mag. Found 0 stars in
largest star catalog for Genie image region. The stars will eliminate
afterglows from about 0% of the Genie image region. The XRT position was
OUTSIDE the star catalog search region.
Genie image analysis:
Found 37641.7 counts in the large background region of 6307.0 pixels or a rate
of 5.968 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 20.21 mag. for a
4-arcsec aperture. The closest srclist source has ra= 181.1246 dec= 53.1382
mag=19.75 sep=86.83". The closest Genie source has ra= 181.0405 dec= 53.1125
mag=21.74 sep=190.68".
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?
703181825 132 WHITE srclist found no candidates.
703181825 132 WHITE image found no candidates.
List afterglow candidates for other finding charts.
703181983 290 U srclist found no candidates.
703181983 290 U image found no candidates.
703182561 868 WHITE srclist found no candidates.
703182561 868 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: 53.15433
GRB_ERROR: 5.5
GRB_RA: 181.09471
IMAGE_START_TIME: 16:17:00
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT