image overlap message for exposure 1 of trigger 1033264
uvot_overlap.pl vrs. 2010-12-20b fem started at 210218d03h31m04s402412usUT
The observation of trigger 1033264 started 2021-02-17T23:27:52.0
Examining file ./1033264_g128_uvot_sky_image.fits
The exposure ID is 635297271
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (97.5888,68.7149) with a roll angle of 300.3
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 (97.6100,68.7150) with a radius of 3.000 arc min
This is 0.461 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 7.17 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (97.5851,68.7254) with a radius of 0.032 arc min
This is 0.632 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 0.003 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1033264
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210218d03h31m08s377131usUT
Observation start time is 2021-02-17T23:27:52.0
Examining file ./1033264_g128_uvot_catalog_image.fits
The exposure ID is 635297271
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 14 detected source(s) for 1033264_g128
Aspect correction adds -0.00265 degrees (-0.636 sec of time = -3.46 arc sec) to RA
Aspect correction adds 0.00019 degrees ( 0.67 arcsec) to Dec
Total aspect correction is 3.52 arcsec
Star catalogs centered at 97.5855 , 68.7140 with radius 2.50 arc min.
n_usno: 108 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.49886
RA DEC Mag Color
bright star 0: 97.52583 (06:30:06.20) 68.72668 (+68:43:36.0) 11.50 USNO-V
Mean distance difference (CAT_DELTA) for 12 matched entries is 0.587" for 1033264_g128
Mean and std. dev of mag. difference (MAG_DELTA) are 1.203 and 1.239 for 1033264_g128
Found 4 entries without IDs and 2 entries that are acceptable afterglow candidates for 1033264_g128.
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.
2 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=97.6100 (06:30:26.40) DEC=68.7150 (+68:42:54.0)
XRT distances are from RA=97.5851 (06:30:20.42) DEC=68.7254 (+68:43:31.3)
*** WARNING 28 per cent of entries have no IDs.
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1033264_g128 with genie
ra=97.58305 (06:30:19.93) dec=68.72516 (+68:43:30.6) +/- 0.6" mag=18.72+/-0.15
dist=2.7 REFID=6 major=1.1 minor=1.0 flag=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
97.5755 68.7215 16.4 -1 USNO-B1 99.99 20.12 99.99
97.5939 68.7227 16.7 -1 USNO-B1 20.97 19.33 20.06
uvot_check_outside found 14 of 14 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 4 in the list of sources is a candidate afterglow for 1033264_g128 with genie
ra=97.64690 (06:30:35.26) dec=68.72303 (+68:43:22.9) +/- 0.7" mag=20.27+/-0.19
dist=81.2 REFID=8 major=0.8 minor=0.1 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 56.2 arc sec from the BAT position.
This source is near the edge of image (0.961)
Found 3 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
97.6376 68.7228 12.2 -1 USNO-B1 19.06 18.21 18.59
97.6488 68.7233 2.6 -1 USNO-B1 17.48 16.79 17.10 *
97.6511 68.7234 5.7 -1 USNO-B1 19.10 99.99 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=97.58305 (06:30:19.93) dec=68.72516 (+68:43:30.6) +/- 0.6" mag=18.72+/-0.15 dist=2.7 REFID=6 flag=0
There are 43442.945 counts in the bkg source region of 6011.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.227 counts/pixel (5-sig UL in 4" is 20.28 mag) for 1033264_g128
There are 816.78973 counts in the src source region of 50.000000 pixels.
Rate in src region with 4 arcsec radius is 16.336 counts/pixel for 1033264_g128
There are 9191.9990 counts in the cand_src_bkg source region of 1244.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 7.389 counts/pixel (5-sig UL in 4" is 20.26 mag) for 1033264_g128
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 20.83, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1033264_635297271_210218d03h31m08s377131usUT_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(97.5888,68.7149,45")
fk5;-circle(97.62175655723,68.7090171492506,6")
fk5;-circle(97.598171225012,68.7026748628276,6")
fk5;-circle(97.5830519296721,68.7251584617575,6")
fk5;-circle(97.5596759889267,68.7152227992957,6")
Region file: 1033264_635297271_210218d03h31m08s377131usUT_cand_src.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(97.5830519296721,68.7251584617575,4")
Region file: 1033264_635297271_210218d03h31m08s377131usUT_cand_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(97.5830519296721,68.7251584617575,25")
fk5;-circle(97.5830519296721,68.7251584617575,15")
image paragraph message for exposure 1 of trigger 1033264
------ Start for Possible Stand-alone Circular ----
In response to GRB210217 (Swift/BAT trigger 1033264) at 23:25:42 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 103 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 06:30:19.93 = 97.58305
DEC(J2000) = +68:43:30.6 = 68.72516
with a 90%-confidence error radius of about 0.63 arc sec. This position is 2.7
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.72 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.103.
------- notes for trigger 1033264 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210218d03h31m13s780320usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1033264
-expid=635297271 -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/1033264/
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 635297271.99206 or about 2021:048:23:27:46 UT
Found 525 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 12% of the srclist region. Found 97 sources in
srclist catalog. Found 36 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 14 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 4 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.83 mag. Found 104 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 11% of the Genie image region.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 97.5829 dec= 68.7253 mag=19.53 sep=2.84".
The closest srclist source has ra= 97.5829 dec= 68.7253 mag=19.53 sep=2.84".
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?
635297271 102 WHITE 97.58291 68.72529 19.53/19.2 2.8 srclist Yes
635297271 102 WHITE 97.58305 68.72516 18.72/20.8 2.7 image Yes
List afterglow candidates for other finding charts.
635297484 315 U srclist found no candidates.
635297484 315 U 97.58323 68.72525 18.54/20.5 0.9 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 68.72516
GRB_ERROR: 0.63
GRB_RA: 97.58305
IMAGE_START_TIME: 23:27:46
MAGNITUDE: 18.72
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT