image overlap message for exposure 1 of trigger 1034721
uvot_overlap.pl vrs. 2010-12-20b fem started at 210226d12h10m14s120313usUT
The observation of trigger 1034721 started 2021-02-26T04:46:05.5
Examining file ./1034721_g127_uvot_sky_image.fits
The exposure ID is 636007565
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (124.1312,57.5815) with a roll angle of 316.3
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 (124.1380,57.5770) with a radius of 3.000 arc min
This is 0.346 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 (124.1153,57.5839) with a radius of 0.025 arc min
This is 0.534 arc min from the center of the uvot region
The area of the XRT error circle is 0.002 sq. arc min
The UVOT/XRT overlap is 0.002 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1034721
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210226d12h10m18s781481usUT
Observation start time is 2021-02-26T04:46:05.5
Examining file ./1034721_g127_uvot_catalog_image.fits
The exposure ID is 636007565
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 4 detected source(s) for 1034721_g127
Aspect correction adds -0.00121 degrees (-0.290 sec of time = -2.34 arc sec) to RA
Aspect correction adds -0.00045 degrees (-1.61 arcsec) to Dec
Total aspect correction is 2.84 arcsec
Star catalogs centered at 124.1365 , 57.5795 with radius 2.44 arc min.
n_usno: 69 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 4 matched entries is 0.492" for 1034721_g127
Mean and std. dev of mag. difference (MAG_DELTA) are 1.425 and 0.453 for 1034721_g127
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1034721_g127.
Acceptable entries have no ID, XRT distances < 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=124.1380 (08:16:33.12) DEC=57.5770 (+57:34:37.2)
XRT distances are from RA=124.1153 (08:16:27.67) DEC=57.5839 (+57:35:02.2)
Found 1 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
124.1108 57.5829 9.5 -1 USNO-B1 20.05 18.94 19.43
The closest star is 9.50" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=124.11096 (08:16:26.63) dec=57.58312 (+57:34:59.2) +/- 1.1" mag=21.36+/-0.34 dist=8.9 REFID=4 flag=0
There are 45017.086 counts in the bkg source region of 6097.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.383 counts/pixel (5-sig UL in 4" is 20.26 mag) for 1034721_g127
There are 1504.6613 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 7.523 counts/pixel for 1034721_g127
There are 9111.7217 counts in the xrt_bkg source region of 1246.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 7.313 counts/pixel (5-sig UL in 4" is 20.27 mag) for 1034721_g127
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 20.82, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1034721_636007565_210226d12h10m18s781481usUT_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(124.1312,57.5815,45")
fk5;-circle(124.146633765574,57.5872470659336,6")
fk5;-circle(124.110957323427,57.5831225010642,6")
Region file: 1034721_636007565_210226d12h10m18s781481usUT_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(124.11529,57.58394,8")
Region file: 1034721_636007565_210226d12h10m18s781481usUT_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(124.11529,57.58394,25")
fk5;-circle(124.11529,57.58394,15")
image paragraph message for exposure 1 of trigger 1034721
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB210226 (Swift/BAT trigger 1034721) at 04:43:57 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 101 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 expected extinction corresponding to E(B-V) of
0.049.
------- notes for trigger 1034721 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210226d12h10m23s172198usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1034721
-expid=636007565 -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/1034721/
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 636007565.4562 or about 2021:057:04:46:00 UT
Found 324 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 28 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
19.22 mag.
Found 4 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. 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
20.82 mag. Found 65 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 7% of the Genie image region.
Genie image analysis:
Found 45017.1 counts in the large background region of 6097.0 pixels or a rate
of 7.383 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 20.09 mag. for a
4-arcsec aperture.
Found 1504.7 counts in the XRT position region of 200.0 pixels or a rate of
7.524 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.281 +/- 0.278 (1-sigma) cps or
20.98 mag and a range from 20.23 to 25.93 mag. The 3-sigma UL at the XRT
position is 1.115 cps or 19.48 mag. The closest srclist source has ra= 124.1466
dec= 57.5871 mag=16.42 sep=61.43".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 124.1110 dec= 57.5831 mag=21.36 sep=8.86". The closest Genie
source has ra= 124.1110 dec= 57.5831 mag=21.36 sep=8.86".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 101 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 08:16:26.63 = 124.11096
DEC(J2000) = +57:34:59.2 = 57.58312
with a 90%-confidence error radius of about 1.10 arc sec. This position is 8.86
arc sec. from the center of the XRT error circle. The estimated magnitude is
21.36 with a 1-sigma error of about 0.34. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.049.
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?
636007565 101 WHITE srclist found no candidates.
636007565 101 WHITE image found no candidates.
List afterglow candidates for other finding charts.
636008332 868 WHITE srclist found no candidates.
636008332 868 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 57.58394
GRB_ERROR: 5
GRB_RA: 124.11529
IMAGE_START_TIME: 04:46:00
MAGNITUDE: 19.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT