srclist overlap message for exposure 2 of trigger 1037339
uvot_overlap.pl vrs. 2010-12-20b fem started at 210319d01h18m44s587926usUT
The observation of trigger 1037339 started 2021-03-18T03:59:43.2
Examining file ./1037339_g311_uvot_sky_srclist.fits
The exposure ID is 637732783
The exposure time is undefined.
The filter is U.
The uvot region is centered at (33.9259,-37.7877) with a roll angle of 309.4
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (33.9300,-37.7890) with a radius of 3.000 arc min
This is 0.208 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 (33.9262,-37.7769) with a radius of 0.040 arc min
This is 0.647 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
srclist afterglow message for exposure 2 of trigger 1037339
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210319d01h19m34s660347usUT
Observation start time is 2021-03-18T03:59:43.2
Examining file ./1037339_g311_uvot_catalog_srclist.fits
The exposure ID is 637732783
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 80 detected source(s) for 1037339_g311
Aspect correction adds -0.00040 degrees (-0.095 sec of time = -1.12 arc sec) to RA
Aspect correction adds 0.00004 degrees ( 0.16 arcsec) to Dec
Total aspect correction is 1.13 arcsec
Star catalogs centered at 33.9336 , -37.7685 with radius 8.26 arc min.
n_usno: 617 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 9.36278
RA DEC Mag Color
bright star 0: 34.03501 (02:16:08.40) -37.85314 (-37:51:11.3) 9.36 USNO-V
Mean distance difference (CAT_DELTA) for 20 matched entries is 0.862" for 1037339_g311
Mean and std. dev of mag. difference (MAG_DELTA) are 1.516 and 1.382 for 1037339_g311
Found 60 entries without IDs and 2 entries that are acceptable afterglow candidates for 1037339_g311.
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.
56 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=33.9300 (02:15:43.20) DEC=-37.7890 (-37:47:20.4)
XRT distances are from RA=33.9262 (02:15:42.29) DEC=-37.7769 (-37:46:36.9)
*** WARNING 75 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1037339_g311 with 3x3 stamp
ra=33.93307 (02:15:43.94) dec=-37.76269 (-37:45:45.7) +/- 1.1" mag=19.29+/-0.35
dist=54.8 REFID=71
*** The position of this source is inconsistent with the XRT position.
The position is 98.7 arc sec from the BAT position.
src: 0 distr. of nearby unmatched sources: 0 0 0 0 0
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
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1037339_g311 with 3x3 stamp
ra=33.98527 (02:15:56.46) dec=-37.78691 (-37:47:12.9) +/- 1.1" mag=19.77+/-0.35
dist=171.8 REFID=79
*** The position of this source is inconsistent with the XRT position.
The position is 157.6 arc sec from the BAT position.
src: 3 distr. of nearby unmatched sources: 0 0 0 0 0
Found 1 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
33.9845 -37.7867 2.3 -1 USNO-B1 99.99 22.27 99.99 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 18.12, XRT distances < 6",
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 2 of trigger 1037339
------ Start for Possible Stand-alone Circular ----
In response to GRB210318 (Swift/BAT trigger 1037339) at 03:54:31 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
284 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
0.017.
------- notes for trigger 1037339 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210319d01h19m36s867818usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1037339
-expid=637732783 -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/1037339/
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 637732783.16306 or about 2021:077:03:59:38 UT
Found 613 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 80 sources in
srclist catalog. Found 60 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 2 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 20.27 mag. Found 51 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 6% of the
Genie image region.
Genie image analysis:
Found 25295.5 counts in the large background region of 6316.0 pixels or a rate
of 4.005 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 19.56 mag. for a
4-arcsec aperture.
Found 813.3 counts in the XRT position region of 199.0 pixels or a rate of
4.087 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.067 +/- 0.123 (1-sigma) cps or
21.12 mag and a range from 19.99 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.435 cps or 19.09 mag. The closest srclist source has ra= 33.9331
dec= -37.7627 mag=19.29 sep=54.82". The closest Genie source has ra= 33.9424
dec= -37.7903 mag=19.49 sep=66.46".
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?
637732783 284 U srclist found no candidates.
637732783 284 U image found no candidates.
List afterglow candidates for other finding charts.
637732625 126 WHITE srclist found no candidates.
637732625 126 WHITE image found no candidates.
637733362 863 WHITE srclist found no candidates.
637733362 863 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -37.77692
GRB_ERROR: 6
GRB_RA: 33.92621
IMAGE_START_TIME: 03:59:38
MAGNITUDE: 19.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT