image overlap message for exposure 2 of trigger 1035922
uvot_overlap.pl vrs. 2010-12-20b fem started at 210308d16h49m56s001898usUT
The observation of trigger 1035922 started 2021-03-05T19:08:28.3
Examining file ./1035922_g323_uvot_sky_image.fits
The exposure ID is 636664108
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (319.8143,34.5521) with a roll angle of 142.6
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 (319.8079,34.5480) with a radius of 1.000 arc min
This is 0.402 arc min from the center of the uvot region
The area of the BAT error circle is 3.14 sq. arc min
The UVOT/BAT overlap is at most 3.14 sq. arc min or 1.00 of the BAT error circle
The XRT error circle is centered at (319.8105,34.5540) with a radius of 0.023 arc min
This is 0.221 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 2 of trigger 1035922
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210308d16h50m05s608920usUT
Observation start time is 2021-03-05T19:08:28.3
Examining file ./1035922_g323_uvot_catalog_image.fits
The exposure ID is 636664108
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 23 detected source(s) for 1035922_g323
Aspect correction adds 0.00049 degrees (0.119 sec of time = 1.47 arc sec) to RA
Aspect correction adds -0.00041 degrees (-1.49 arcsec) to Dec
Total aspect correction is 2.09 arcsec
Star catalogs centered at 319.8124 , 34.5521 with radius 2.50 arc min.
n_usno: 236 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.36466
RA DEC Mag Color
bright star 0: 319.84949 (21:19:23.88) 34.57085 (+34:34:15.1) 11.36 USNO-V
Mean distance difference (CAT_DELTA) for 22 matched entries is 0.502" for 1035922_g323
Mean and std. dev of mag. difference (MAG_DELTA) are 1.398 and 0.696 for 1035922_g323
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1035922_g323.
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=319.8079 (21:19:13.90) DEC=34.5480 (+34:32:52.8)
XRT distances are from RA=319.8105 (21:19:14.53) DEC=34.5540 (+34:33:14.5)
-----------------
Entry 5 in the list of sources is a candidate afterglow for 1035922_g323 with genie
ra=319.80433 (21:19:13.04) dec=34.54303 (+34:32:34.9) +/- 0.6" mag=16.70+/-0.14
dist=43.7 REFID=19 major=1.0 minor=0.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 57.9 arc sec from the BAT position.
Found 4 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
319.8064 34.5448 8.7 -1 USNO-B1 99.99 19.21 99.99
319.8074 34.5407 12.5 -1 USNO-B1 99.99 19.03 99.99
319.8031 34.5426 4.0 -1 USNO-B1 14.39 12.72 13.47
319.8029 34.5409 8.9 -1 USNO-B1 19.98 99.99 99.99
*** If XRT position is correct, then this is NOT the afterglow
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
319.8097 34.5554 5.5 -1 USNO-B1 15.34 14.16 14.68
319.8106 34.5567 9.7 -1 USNO-B1 17.03 15.43 16.14
The closest star is 5.53" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=319.80947 (21:19:14.27) dec=34.55526 (+34:33:18.9) +/- 0.6" mag=15.89+/-0.14 dist=5.4 REFID=9 flag=0
There are 39371.879 counts in the bkg source region of 5814.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 6.772 counts/pixel (5-sig UL in 4" is 19.43 mag) for 1035922_g323
There are 3048.9473 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 15.399 counts/pixel for 1035922_g323
There are 7723.1353 counts in the xrt_bkg source region of 1148.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 6.727 counts/pixel (5-sig UL in 4" is 19.43 mag) for 1035922_g323
There are 1 candidate(s) outside XRT error circle with mag < 19.42
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.98, 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: 1035922_636664108_210308d16h50m05s608920usUT_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(319.8143,34.5521,45")
fk5;-circle(319.809465384197,34.5552562511669,6")
fk5;-circle(319.813427070549,34.5508256966249,6")
fk5;-circle(319.812152666929,34.5470127480165,6")
fk5;-circle(319.802659275592,34.5597216005471,6")
fk5;-circle(319.798443501056,34.5556173383665,6")
fk5;-circle(319.804334163328,34.5430348600278,6")
fk5;-circle(319.802693495124,34.5424987397973,6")
Region file: 1035922_636664108_210308d16h50m05s608920usUT_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(319.81054,34.55403,8")
Region file: 1035922_636664108_210308d16h50m05s608920usUT_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(319.81054,34.55403,25")
fk5;-circle(319.81054,34.55403,15")
fk5;-circle(319.813427070549,34.5508256966249,6")
fk5;-circle(319.812152666929,34.5470127480165,6")
image paragraph message for exposure 2 of trigger 1035922
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 GRB210305 (Swift/BAT trigger 1035922) at 19:03:04 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
297 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. Data
from the list of sources generated on-board are not available at this time. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.155.
------- notes for trigger 1035922 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210308d16h50m09s065263usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1035922
-expid=636664108 -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/1035922/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 636664108.33476 or about 2021:064:19:08:23 UT
No information found about the number of stars in the star catalog for srclist
region.
Found 23 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
19.98 mag. Found 232 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 25% of the Genie image region.
Genie image analysis:
Found 39371.9 counts in the large background region of 5814.0 pixels or a rate
of 6.772 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 19.28 mag. for a
4-arcsec aperture.
Found 3048.9 counts in the XRT position region of 198.0 pixels or a rate of
15.398 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 6.867 +/- 0.229 (1-sigma) cps or
16.10 mag and a range from 16.06 to 16.14 mag. The 3-sigma UL at the XRT
position is 7.555 cps or 15.99 mag.
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 319.8095 dec= 34.5553 mag=15.89 sep=5.44". The closest Genie
source has ra= 319.8095 dec= 34.5553 mag=15.89 sep=5.44".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the image data with mag < 19.42 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=319.80433
(21:19:13.04), DEC=34.54303 (+34:32:34.9) (J2000). It has a mag of 16.70. It is
57.9" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 250 seconds with the U filter starting
297 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 21:19:13.04 = 319.80433
DEC(J2000) = +34:32:34.9 = 34.54303
with a 90%-confidence error radius of about 0.62 arc sec. The estimated
magnitude is 16.70 with a 1-sigma error of about 0.14. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.155.
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 250 seconds with the U filter starting
297 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 21:19:14.27 = 319.80947
DEC(J2000) = +34:33:18.9 = 34.55526
with a 90%-confidence error radius of about 0.61 arc sec. This position is 5.44
arc sec. from the center of the XRT error circle. The estimated magnitude is
15.89 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.155.
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?
636664108 296 ? srclist data are not available.
636664108 296 U image found no candidates.
List afterglow candidates for other finding charts.
636663896 84 WHITE srclist found no candidates.
636663896 84 WHITE image found no candidates.
636664687 875 WHITE srclist found no candidates.
636664687 875 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 34.55403
GRB_ERROR: 5
GRB_RA: 319.81054
IMAGE_START_TIME: 19:08:23
MAGNITUDE: 16.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT