srclist overlap message for exposure 2 of trigger 1048783
uvot_overlap.pl vrs. 2010-12-20b fem started at 210517d09h12m05s297441usUT
The observation of trigger 1048783 started 2021-05-17T05:33:10.3
Examining file ./1048783_g308_uvot_sky_srclist.fits
The exposure ID is 642922390
The exposure time is undefined.
The filter is U.
The uvot region is centered at (358.1817,-39.0973) with a roll angle of 53.0
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 (358.1740,-39.1050) with a radius of 3.000 arc min
This is 0.584 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 (358.2245,-39.1022) with a radius of 0.037 arc min
This is 2.010 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1048783
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210517d09h12m19s022057usUT
Observation start time is 2021-05-17T05:33:10.3
Examining file ./1048783_g308_uvot_catalog_srclist.fits
The exposure ID is 642922390
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 31 detected source(s) for 1048783_g308
Aspect correction adds 0.00287 degrees (0.690 sec of time = 8.03 arc sec) to RA
Aspect correction adds 0.00328 degrees (11.82 arcsec) to Dec
Total aspect correction is 14.29 arcsec
Star catalogs centered at 358.1804 , -39.1044 with radius 8.45 arc min.
n_usno: 666 n_gsc: 0
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 10.50384
RA DEC Mag Color
bright star 0: 358.16675 (23:52:40.02) -39.00227 (-39:00:08.2) 10.50 USNO-V
bright star 1: 358.05558 (23:52:13.34) -39.14214 (-39:08:31.7) 11.70 USNO-V
bright star 2: 358.07622 (23:52:18.29) -39.01268 (-39:00:45.6) 11.20 USNO-R
Mean distance difference (CAT_DELTA) for 23 matched entries is 0.967" for 1048783_g308
Mean and std. dev of mag. difference (MAG_DELTA) are 2.016 and 1.143 for 1048783_g308
Found 9 entries without IDs and 2 entries that are acceptable afterglow candidates for 1048783_g308.
Acceptable entries have no ID, XRT distances < 5.5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
4 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=358.1740 (23:52:41.76) DEC=-39.1050 (-39:06:18.0)
XRT distances are from RA=358.2245 (23:52:53.87) DEC=-39.1022 (-39:06:07.9)
*** WARNING 29 per cent of entries have no IDs.
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1048783_g308 with 5x5 stamp
ra=358.10686 (23:52:25.65) dec=-39.10897 (-39:06:32.3) +/- 1.1" mag=19.77+/-0.35
dist=329.4 REFID=31
*** The position of this source is inconsistent with the XRT position.
The position is 188.1 arc sec from the BAT position.
src: 1 distr. of nearby unmatched sources: 1 0 0 0 0
Found 2 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
358.1060 -39.1084 3.1 -1 USNO-B1 16.22 15.26 15.69 *
358.1036 -39.1059 14.3 -1 USNO-B1 21.12 19.81 20.39
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1048783_g308 with 5x5 stamp
ra=358.10626 (23:52:25.50) dec=-39.10903 (-39:06:32.5) +/- 1.1" mag=19.30+/-0.35
dist=331.1 REFID=29
*** The position of this source is inconsistent with the XRT position.
The position is 189.8 arc sec from the BAT position.
src: 2 distr. of nearby unmatched sources: 1 0 0 0 0
Found 2 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
358.1060 -39.1084 2.4 -1 USNO-B1 16.22 15.26 15.69 *
358.1036 -39.1059 13.4 -1 USNO-B1 21.12 19.81 20.39
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
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
358.2228 -39.1007 7.0 -1 USNO-B1 19.76 19.30 19.51
358.2231 -39.1033 5.4 -1 USNO-B1 20.49 19.02 19.67
The closest star is 5.41" 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 18.12, XRT distances < 5.5",
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 2 of trigger 1048783
IMAGE PROBLEM: no overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB210517 (Swift/BAT trigger 1048783) at 05:28:01 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
281 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 none of the
XRT error circle. 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 0.011.
------- notes for trigger 1048783 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210517d09h12m21s792613usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1048783
-expid=642922390 -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/1048783/
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 642922390.26926 or about 2021:137:05:33:05 UT
Found 662 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 31 sources in
srclist catalog. Found 9 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 0 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 20.06 mag. Found 29 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 5% of the
Genie image region. The XRT position was OUTSIDE the star catalog search
region.
Genie image analysis:
Found 36969.1 counts in the large background region of 6320.0 pixels or a rate
of 5.850 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 19.35 mag. for a
4-arcsec aperture. The closest srclist source has ra= 358.2485 dec= -39.0992
mag=19.62 sep=67.96".
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?
642922390 281 U srclist found no candidates.
642922390 281 U image found no candidates.
List afterglow candidates for other finding charts.
642922178 69 WHITE srclist found no candidates.
642922178 69 WHITE image found no candidates.
642922968 859 WHITE srclist found no candidates.
642922968 859 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -39.10219
GRB_ERROR: 5.5
GRB_RA: 358.22446
IMAGE_START_TIME: 05:33:05
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT