image overlap message for exposure 1 of trigger 1071993
uvot_overlap.pl vrs. 2010-12-20b fem started at 210905d02h28m08s890157usUT
The observation of trigger 1071993 started 2021-09-05T00:15:46.0
Examining file ./1071993_g183_uvot_sky_image.fits
The exposure ID is 652493745
The exposure time is 249.924 (seconds)
The filter is U.
The uvot region is centered at (309.0433,-44.4434) with a roll angle of 229.6
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 (309.0620,-44.4310) with a radius of 3.000 arc min
This is 1.094 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 (309.0482,-44.4396) with a radius of 0.043 arc min
This is 0.314 arc min from the center of the uvot region
The area of the XRT error circle is 0.006 sq. arc min
The UVOT/XRT overlap is 0.006 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1071993
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210905d02h28m15s628125usUT
Observation start time is 2021-09-05T00:15:46.0
Examining file ./1071993_g183_uvot_catalog_image.fits
The exposure ID is 652493745
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 14 detected source(s) for 1071993_g183
Aspect correction adds 0.00080 degrees (0.191 sec of time = 2.04 arc sec) to RA
Aspect correction adds -0.00056 degrees (-2.01 arcsec) to Dec
Total aspect correction is 2.87 arcsec
Star catalogs centered at 309.0412 , -44.4409 with radius 2.30 arc min.
n_usno: 76 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 14 matched entries is 0.577" for 1071993_g183
Mean and std. dev of mag. difference (MAG_DELTA) are 0.938 and 0.619 for 1071993_g183
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1071993_g183.
Acceptable entries have no ID, XRT distances < 6.5", 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=309.0620 (20:36:14.88) DEC=-44.4310 (-44:25:51.6)
XRT distances are from RA=309.0482 (20:36:11.58) DEC=-44.4396 (-44:26:22.4)
Found 2 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
309.0484 -44.4368 9.8 -1 USNO-B1 19.55 20.36 20.00
309.0490 -44.4372 8.8 -1 USNO-B1 19.38 18.95 19.14
The closest star is 8.76" away.
List UVOT sources within 10" of the XRT position:
There are 13883.553 counts in the bkg source region of 5695.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.438 counts/pixel (5-sig UL in 4" is 19.98 mag) for 1071993_g183
There are 458.81073 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.294 counts/pixel for 1071993_g183
There are 2418.2241 counts in the xrt_bkg source region of 1046.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.312 counts/pixel (5-sig UL in 4" is 20.01 mag) for 1071993_g183
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 20.54, XRT distances < 6.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1071993_652493745_210905d02h28m15s628125usUT_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(309.0433,-44.4434,45")
fk5;-circle(309.041974537067,-44.4365486953231,6")
fk5;-circle(309.041009905042,-44.4419223852911,6")
fk5;-circle(309.034089114036,-44.441940361078,6")
fk5;-circle(309.051977537781,-44.4498634249151,6")
fk5;-circle(309.040591607135,-44.4544535303142,6")
fk5;-circle(309.034189830981,-44.4536051583123,6")
Region file: 1071993_652493745_210905d02h28m15s628125usUT_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(309.04825,-44.43956,8")
Region file: 1071993_652493745_210905d02h28m15s628125usUT_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(309.04825,-44.43956,25")
fk5;-circle(309.04825,-44.43956,15")
fk5;-circle(309.041974537067,-44.4365486953231,6")
fk5;-circle(309.041009905042,-44.4419223852911,6")
image paragraph message for exposure 1 of trigger 1071993
SRCLIST PROBLEM: srclist filled telemetry buffer
------ Start for Possible Stand-alone Circular ----
In response to GRB210905 (Swift/BAT trigger 1071993) at 00:12:41 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
156 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
0.034.
------- notes for trigger 1071993 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210905d02h28m24s998093usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1071993
-expid=652493745 -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/1071993/
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 652493745.96298 or about 2021:248:00:15:40 UT
Found 1239 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 73 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 14 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 20.54 mag. Found 72 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
9% of the Genie image region.
Genie image analysis:
Found 13883.6 counts in the large background region of 5695.0 pixels or a rate
of 2.438 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 19.83 mag. for a
4-arcsec aperture.
Found 458.8 counts in the XRT position region of 200.0 pixels or a rate of
2.294 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.014 +/- 0.094 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.281 cps or 19.56 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 19.58
mag. The closest srclist source has ra= 309.0410 dec= -44.4421 mag=17.29
sep=20.70". The closest Genie source has ra= 309.0420 dec= -44.4365 mag=20.29
sep=19.44".
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?
652493745 156 U srclist found no candidates.
652493745 156 U image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -44.43956
GRB_ERROR: 6.5
GRB_RA: 309.04825
IMAGE_START_TIME: 00:15:40
MAGNITUDE: 19.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT