srclist overlap message for exposure 1 of trigger 1034721
uvot_overlap.pl vrs. 2010-12-20b fem started at 210226d12h10m12s911280usUT
The observation of trigger 1034721 started 2021-02-26T04:46:05.5
Examining file ./1034721_g127_uvot_sky_srclist.fits
The exposure ID is 636007565
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (124.1309,57.5815) with a roll angle of 316.3
It is square with sides of 8.03 arc min. for an area of 64.51 sq arc min
The BAT error circle is centered at (124.1380,57.5770) with a radius of 3.000 arc min
This is 0.353 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 28.27 sq. arc min or 1.00 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 0.523 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
srclist afterglow message for exposure 1 of trigger 1034721
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210226d12h10m15s777816usUT
Observation start time is 2021-02-26T04:46:05.5
Examining file ./1034721_g127_uvot_catalog_srclist.fits
The exposure ID is 636007565
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 28 detected source(s) for 1034721_g127
Aspect correction adds -0.00115 degrees (-0.276 sec of time = -2.22 arc sec) to RA
Aspect correction adds -0.00057 degrees (-2.05 arcsec) to Dec
Total aspect correction is 3.02 arcsec
Star catalogs centered at 124.1474 , 57.5850 with radius 5.65 arc min.
n_usno: 328 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.5753
RA DEC Mag Color
bright star 0: 124.06409 (08:16:15.38) 57.53050 (+57:31:49.8) 11.58 USNO-V
Mean distance difference (CAT_DELTA) for 25 matched entries is 0.629" for 1034721_g127
Mean and std. dev of mag. difference (MAG_DELTA) are 2.209 and 1.515 for 1034721_g127
Found 3 entries without IDs and 1 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.
2 sources matched bright stars.
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)
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1034721_g127 with 5x5 stamp
ra=124.13590 (08:16:32.62) dec=57.55748 (+57:33:26.9) +/- 1.1" mag=18.44+/-0.35
dist=103.2 REFID=15
*** The position of this source is inconsistent with the XRT position.
The position is 70.4 arc sec from the BAT position.
src: 1 distr. of nearby unmatched sources: 0 0 0 0 0
Found 8 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
124.1390 57.5627 19.6 -1 USNO-B1 20.63 19.60 20.06
124.1344 57.5622 17.2 -1 USNO-B1 19.87 20.01 19.95
124.1337 57.5619 16.3 -1 USNO-B1 20.82 19.77 20.23
124.1398 57.5590 9.3 -1 USNO-B1 99.99 19.06 99.99
124.1348 57.5573 2.2 -1 USNO-B1 13.77 13.08 13.38 *
124.1408 57.5546 14.1 -1 USNO-B1 20.68 20.06 20.34
124.1402 57.5542 14.6 -1 USNO-B1 20.71 20.45 20.57
124.1392 57.5539 14.4 -1 USNO-B1 20.66 20.07 20.33
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
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:
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 19.22, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist 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 210226d12h10m20s808038usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1034721
-expid=636007565 -meonly -msg_srclist
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