image overlap message for exposure 1 of trigger 1044426
uvot_overlap.pl vrs. 2010-12-20b fem started at 210421d15h24m31s224179usUT
The observation of trigger 1044426 started 2021-04-21T00:29:33.6
Examining file ./1044426_g122_uvot_sky_image.fits
The exposure ID is 640657773
The exposure time is 149.846 (seconds)
The filter is WHITE.
The uvot region is centered at (104.8688,4.9224) with a roll angle of 281.0
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 (104.9080,4.9340) with a radius of 3.000 arc min
This is 2.446 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 4.89 sq. arc min or 0.17 of the BAT error circle
The XRT error circle is centered at (104.8744,4.9223) with a radius of 0.040 arc min
This is 0.338 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1044426
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210421d15h24m41s336920usUT
Observation start time is 2021-04-21T00:29:33.6
Examining file ./1044426_g122_uvot_catalog_image.fits
The exposure ID is 640657773
The exposure is 149.846 sec.
The bin size is 2 pixels
The filter is WHITE
There are 39 detected source(s) for 1044426_g122
Aspect correction adds -0.00133 degrees (-0.320 sec of time = -4.79 arc sec) to RA
Aspect correction adds 0.00006 degrees ( 0.21 arcsec) to Dec
Total aspect correction is 4.79 arcsec
Star catalogs centered at 104.8690 , 4.9218 with radius 2.69 arc min.
n_usno: 243 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 38 matched entries is 0.401" for 1044426_g122
Mean and std. dev of mag. difference (MAG_DELTA) are 1.186 and 0.496 for 1044426_g122
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1044426_g122.
Acceptable entries have no ID, XRT distances < 6", 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=104.9080 (06:59:37.92) DEC= 4.9340 (+04:56:02.4)
XRT distances are from RA=104.8744 (06:59:29.86) DEC= 4.9223 (+04:55:20.4)
-----------------
Entry 12 in the list of sources is a candidate afterglow for 1044426_g122 with genie
ra=104.88278 (06:59:31.87) dec=4.90788 (+04:54:28.4) +/- 0.7" mag=19.99+/-0.20
dist=60.1 REFID=38 major=0.7 minor=0.4 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 130.5 arc sec from the BAT position.
This source is near the edge of image (0.892)
Found 3 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)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
104.8836 4.9122 15.9 -1 USNO-B1 19.67 17.76 18.61
104.8844 4.9062 8.2 -1 USNO-B1 15.00 13.59 14.22
104.8842 4.9052 10.8 -1 USNO-B1 19.34 17.47 18.30
*** If XRT position is correct, then this is NOT the afterglow
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 79423.273 counts in the bkg source region of 5438.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 14.605 counts/pixel (5-sig UL in 4" is 19.89 mag) for 1044426_g122
There are 2884.4656 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 14.351 counts/pixel for 1044426_g122
There are 15424.727 counts in the xrt_bkg source region of 1055.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 14.621 counts/pixel (5-sig UL in 4" is 19.89 mag) for 1044426_g122
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.45, XRT distances < 6",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1044426_640657773_210421d15h24m41s336920usUT_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(104.8688,4.9224,45")
fk5;-circle(104.872852201328,4.91751295582719,6")
fk5;-circle(104.870184374775,4.92748107882851,6")
fk5;-circle(104.865474624452,4.92176808286533,6")
fk5;-circle(104.874102261302,4.92983038476068,6")
fk5;-circle(104.864802258947,4.91355243147856,6")
fk5;-circle(104.87512303402,4.93217747722547,6")
fk5;-circle(104.871549679066,4.93322360552361,6")
fk5;-circle(104.862363955904,4.92845818899034,6")
fk5;-circle(104.8563515048,4.92745204396245,6")
Region file: 1044426_640657773_210421d15h24m41s336920usUT_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(104.87442,4.92233,8")
Region file: 1044426_640657773_210421d15h24m41s336920usUT_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(104.87442,4.92233,25")
fk5;-circle(104.87442,4.92233,15")
fk5;-circle(104.872852201328,4.91751295582719,6")
fk5;-circle(104.870184374775,4.92748107882851,6")
fk5;-circle(104.874102261302,4.92983038476068,6")
image paragraph message for exposure 1 of trigger 1044426
SRCLIST PROBLEM: srclist filled telemetry buffer
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB210421 (Swift/BAT trigger 1044426) at 00:27:30 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 96 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 19.6 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 mag. No
correction has been made for the large, but uncertain, extinction expected.
------- notes for trigger 1044426 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210421d15h24m45s450664usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1044426
-expid=640657773 -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/1044426/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for xrt position. XRT position found for srclist.
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 640657773.59262 or about 2021:111:00:29:28 UT
Found 1294 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 22% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 6 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 19.22 mag.
Found 39 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 20.45 mag. Found 239 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
22% of the Genie image region.
Genie image analysis:
Found 79423.3 counts in the large background region of 5438.0 pixels or a rate
of 14.605 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 19.72 mag. for a
4-arcsec aperture.
Found 2884.5 counts in the XRT position region of 201.0 pixels or a rate of
14.351 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.362 +/- 0.391 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.174 cps or 19.43 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 18.98
mag. The closest srclist source has ra= 104.8729 dec= 4.9176 mag=17.70
sep=17.84". The closest Genie source has ra= 104.8728 dec= 4.9175 mag=17.04
sep=18.23".
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?
640657773 95 WHITE srclist found no candidates.
640657773 95 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 4.92233
GRB_ERROR: 6
GRB_RA: 104.87442
IMAGE_START_TIME: 00:29:28
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT