image overlap message for exposure 2 of trigger 1044032
uvot_overlap.pl vrs. 2010-12-20b fem started at 210419d19h39m45s346152usUT
The observation of trigger 1044032 started 2021-04-19T06:59:02.4
Examining file ./1044032_g320_uvot_sky_image.fits
The exposure ID is 640508342
The exposure time is 249.924 (seconds)
The filter is U.
*** Warning -- found 21288 null pixels in the image.
The uvot region is centered at (86.8431,-65.5030) with a roll angle of 302.4
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 (86.8620,-65.5390) with a radius of 3.000 arc min
This is 2.208 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 at most 4.26 sq. arc min or 0.15 of the BAT error circle
The XRT error circle is centered at (86.8510,-65.5025) with a radius of 0.033 arc min
This is 0.197 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.00 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1044032
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210419d19h39m59s471763usUT
Observation start time is 2021-04-19T06:59:02.4
Examining file ./1044032_g320_uvot_catalog_image.fits
The exposure ID is 640508342
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 1 detected source(s) for 1044032_g320
Aspect correction adds -0.00119 degrees (-0.286 sec of time = -1.78 arc sec) to RA
Aspect correction adds 0.00020 degrees ( 0.73 arcsec) to Dec
Total aspect correction is 1.92 arcsec
Star catalogs centered at 86.8104 , -65.5068 with radius 2.00 arc min.
n_usno: 191 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 0 matched entries is 0.000" for 1044032_g320
Mean and std. dev of mag. difference (MAG_DELTA) are 0.000 and -1.000 for 1044032_g320
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1044032_g320.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=86.8620 (05:47:26.88) DEC=-65.5390 (-65:32:20.4)
XRT distances are from RA=86.8510 (05:47:24.23) DEC=-65.5025 (-65:30:09.0)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1044032_g320 with genie
ra=86.79640 (05:47:11.14) dec=-65.50471 (-65:30:17.0) +/- 1.3" mag=20.02+/-0.39
dist=81.8 REFID=1 major=1.1 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 157.5 arc sec from the BAT position.
Found 5 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
86.8050 -65.5074 16.2 -1 USNO-B1 17.95 16.89 17.36
86.8025 -65.5012 15.5 -1 USNO-B1 99.99 18.94 99.99
86.7958 -65.5041 2.5 -1 USNO-B1 17.88 18.65 18.31 *
86.7919 -65.5030 9.0 -1 USNO-B1 18.86 19.08 18.98
86.7918 -65.5011 14.8 -1 USNO-B1 18.95 18.49 18.69
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 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
86.8514 -65.5041 5.7 -1 USNO-B1 16.86 15.86 16.30
86.8561 -65.5025 7.7 -1 USNO-B1 19.33 18.45 18.84
The closest star is 5.68" away.
List UVOT sources within 10" of the XRT position:
There are 0.0000000 counts in the bkg source region of 0.0000000 pixels.
There are 0.0000000 counts in the xrt source region of 0.0000000 pixels.
There are 0.0000000 counts in the xrt_bkg source region of 0.0000000 pixels.
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 18.32, 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: 1044032_640508342_210419d19h39m59s471763usUT_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(86.8431,-65.5030,45")
Region file: 1044032_640508342_210419d19h39m59s471763usUT_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(86.85096,-65.50250,8")
Region file: 1044032_640508342_210419d19h39m59s471763usUT_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(86.85096,-65.50250,25")
fk5;-circle(86.85096,-65.50250,15")
image paragraph message for exposure 2 of trigger 1044032
IMAGE PROBLEM: no overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB210419 (Swift/BAT trigger 1044032) at 06:53:41 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
294 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 0.075.
------- notes for trigger 1044032 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210419d19h40m03s851057usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1044032
-expid=640508342 -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/1044032/
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 640508342.39864 or about 2021:109:06:58:57 UT
Found 1648 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 31% of the srclist region. Found 118 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 1 source(s) in Genie image catalog. 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 18.32 mag. Found 187 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 32% of the
Genie image region. The Genie image is INCOMPLETE with 21288 null pixels.
Found no Genie image background information.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 86.8511 dec= -65.5041 mag=17.23 sep=5.92".
The closest srclist source has ra= 86.8511 dec= -65.5041 mag=17.23 sep=5.92".
The closest Genie source has ra= 86.7964 dec= -65.5047 mag=20.02 sep=81.83".
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
294 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 05:47:24.26 = 86.85108
DEC(J2000) = -65:30:14.9 = -65.50414
with a 90%-confidence error radius of about 1.10 arc sec. This position is 5.92
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.23 with a 1-sigma error of about 0.35. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.075.
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?
640508342 294 U srclist found no candidates.
640508342 294 U image found no candidates.
List afterglow candidates for other finding charts.
640508184 136 WHITE srclist found no candidates.
640508184 136 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -65.50250
GRB_ERROR: 5
GRB_RA: 86.85096
IMAGE_START_TIME: 06:58:57
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT