srclist overlap message for exposure 2 of trigger 977310
uvot_overlap.pl vrs. 2010-12-20b fem started at 200612d20h13m27s288834usUT
The observation of trigger 977310 started 2020-06-12T04:45:09.8
Examining file ./977310_g331_uvot_sky_srclist.fits
The exposure ID is 613629909
The exposure time is undefined.
The filter is U.
The uvot region is centered at (302.7090,-45.3349) with a roll angle of 109.1
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 (302.6810,-45.3570) with a radius of 3.000 arc min
This is 1.775 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 26.35 sq. arc min or 0.93 of the BAT error circle
The XRT error circle is centered at (302.7020,-45.3355) with a radius of 0.025 arc min
This is 0.297 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 2 of trigger 977310
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200612d20h13m43s712827usUT
Observation start time is 2020-06-12T04:45:09.8
Examining file ./977310_g331_uvot_catalog_srclist.fits
The exposure ID is 613629909
The exposure is 67.786 sec.
The bin size is 2 pixels
The filter is U
There are 21 detected source(s) for 977310_g331
Aspect correction adds 0.00188 degrees (0.450 sec of time = 4.75 arc sec) to RA
Aspect correction adds 0.00098 degrees ( 3.51 arcsec) to Dec
Total aspect correction is 5.90 arcsec
Star catalogs centered at 302.7245 , -45.3221 with radius 5.84 arc min.
n_usno: 528 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.6974
RA DEC Mag Color
bright star 0: 302.75555 (20:11:01.33) -45.31954 (-45:19:10.3) 10.70 USNO-V
Mean distance difference (CAT_DELTA) for 20 matched entries is 0.628" for 977310_g331
Mean and std. dev of mag. difference (MAG_DELTA) are 2.570 and 1.532 for 977310_g331
Found 2 entries without IDs and 1 entries that are acceptable afterglow candidates for 977310_g331.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=302.6810 (20:10:43.44) DEC=-45.3570 (-45:21:25.2)
XRT distances are from RA=302.7020 (20:10:48.49) DEC=-45.3355 (-45:20:07.8)
-----------------
Entry 2 in the list of sources is a candidate afterglow for 977310_g331 with 5x5 stamp
ra=302.73447 (20:10:56.27) dec=-45.31889 (-45:19:08.0) +/- 1.1" mag=19.14+/-0.35
dist=101.6 REFID=16
*** The position of this source is inconsistent with the XRT position.
The position is 192.7 arc sec from the BAT position.
src: 2 distr. of nearby unmatched sources: 0 0 0 0 0
Found 1 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
302.7349 -45.3184 2.1 -1 USNO-B1 15.26 14.21 14.68 *
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:
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 17.41, 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 2 of trigger 977310
IMAGE PROBLEM: damaged image (negative pixel value)
------ Start for Possible Stand-alone Circular ----
In response to GRB200612 (Swift/BAT trigger 977310) at 04:39:37 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 68 seconds with the U filter starting
307 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. The 2.7'x2.7' sub-image processing FAILED
because of damaged image (negative pixel value). 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 0.03.
------- notes for trigger 977310 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200612d20h13m46s508066usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=977310
-expid=613629909 -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/977310/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
The Genie image appears to be DAMAGED with a min. value of -1.531119.
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 613629909.81946 or about 2020:164:04:45:04 UT
Found 524 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 10% of the srclist region. Found 21 sources in
srclist catalog. Found 2 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.41 mag.
Found 7 source(s) in Genie image catalog. Found 6 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 18.89 mag. Found 106 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 11% of the
Genie image region. The Genie image is INCOMPLETE with 1874 null pixels.
The closest srclist source has ra= 302.6710 dec= -45.3317 mag=19.16 sep=79.85".
The closest Genie source has ra= 302.7013 dec= -45.3308 mag=18.38 sep=17.13".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the image data with mag < 18.33 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=302.67491
(20:10:41.98), DEC=-45.33271 (-45:19:57.8) (J2000). It has a mag of 18.18. It
is 88.8" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 68 seconds with the U filter starting
307 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 20:10:41.98 = 302.67491
DEC(J2000) = -45:19:57.8 = -45.33271
with a 90%-confidence error radius of about 0.93 arc sec. The estimated
magnitude is 18.18 with a 1-sigma error of about 0.23. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.03.
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?
613629909 306 U srclist found no candidates.
613629909 306 U image found no candidates.
List afterglow candidates for other finding charts.
613629697 94 WHITE srclist found no candidates.
613629697 94 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -45.33550
GRB_ERROR: 5
GRB_RA: 302.70204
IMAGE_START_TIME: 04:45:04
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT