srclist overlap message for exposure 2 of trigger 1031297
uvot_overlap.pl vrs. 2010-12-20b fem started at 210208d02h13m52s229623usUT
The observation of trigger 1031297 started 2021-02-07T21:57:29.1
Examining file ./1031297_g320_uvot_sky_srclist.fits
The exposure ID is 634427849
The exposure time is undefined.
The filter is U.
The uvot region is centered at (270.6435,53.6807) with a roll angle of 130.5
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 (270.5820,53.6940) with a radius of 3.000 arc min
This is 2.326 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 25.16 sq. arc min or 0.89 of the BAT error circle
The XRT error circle is centered at (270.6347,53.6821) with a radius of 0.028 arc min
This is 0.321 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
srclist afterglow message for exposure 2 of trigger 1031297
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210208d02h14m02s862806usUT
Observation start time is 2021-02-07T21:57:29.1
Examining file ./1031297_g320_uvot_catalog_srclist.fits
The exposure ID is 634427849
The exposure is 115.324 sec.
The bin size is 2 pixels
The filter is U
There are 16 detected source(s) for 1031297_g320
Aspect correction adds 0.00410 degrees (0.985 sec of time = 8.75 arc sec) to RA
Aspect correction adds 0.00087 degrees ( 3.14 arcsec) to Dec
Total aspect correction is 9.30 arcsec
Star catalogs centered at 270.6280 , 53.6849 with radius 6.47 arc min.
n_usno: 515 n_gsc: 0
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 9.66516
RA DEC Mag Color
bright star 0: 270.79033 (18:03:09.68) 53.70995 (+53:42:35.8) 11.85 USNO-V
bright star 1: 270.48796 (18:01:57.11) 53.62566 (+53:37:32.4) 9.67 USNO-V
Mean distance difference (CAT_DELTA) for 14 matched entries is 0.518" for 1031297_g320
Mean and std. dev of mag. difference (MAG_DELTA) are 1.863 and 0.330 for 1031297_g320
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1031297_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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=270.5820 (18:02:19.68) DEC=53.6940 (+53:41:38.4)
XRT distances are from RA=270.6347 (18:02:32.34) DEC=53.6821 (+53:40:55.5)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1031297_g320 with 5x5 stamp
ra=270.63514 (18:02:32.43) dec=53.68212 (+53:40:55.6) +/- 1.1" mag=15.68+/-0.35
dist=0.8 REFID=2
src: 0 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
270.6320 53.6803 9.5 -1 USNO-B1 20.99 19.41 20.11
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 mag
-----------------
Entry 7 in the list of sources is a candidate afterglow for 1031297_g320 with 5x5 stamp
ra=270.60384 (18:02:24.92) dec=53.73645 (+53:44:11.2) +/- 1.1" mag=19.39+/-0.35
dist=206.5 REFID=16
*** The position of this source is inconsistent with the XRT position.
The position is 159.7 arc sec from the BAT position.
src: 7 distr. of nearby unmatched sources: 0 0 0 0 0
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
270.6098 53.7340 15.4 -1 USNO-B1 20.84 18.86 19.73
270.5993 53.7349 11.1 -1 USNO-B1 18.53 17.62 18.02
270.6004 53.7394 12.8 -1 USNO-B1 20.92 19.33 20.04
*** If XRT position is correct, then this is NOT the afterglow
Found 1 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
270.6320 53.6803 8.8 -1 USNO-B1 20.99 19.41 20.11
The closest star is 8.80" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=270.63514 (18:02:32.43) dec=53.68212 (+53:40:55.6) +/- 1.1" mag=15.68+/-0.35 dist=0.8 REFID=2
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 17.70, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 1031297
------ Start for Possible Stand-alone Circular ----
In response to GRB210207 (Swift/BAT trigger 1031297) at 21:52:08 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 115 seconds with the U filter starting
294 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:02:32.44 = 270.63515
DEC(J2000) = +53:40:55.8 = 53.68218
with a 90%-confidence error radius of about 0.61 arc sec. This position is 0.9
arc sec. from the center of the XRT error circle. The estimated magnitude is
14.42 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.041.
------- notes for trigger 1031297 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210208d02h14m05s763959usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1031297
-expid=634427849 -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/1031297/
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 634427849.0602 or about 2021:038:21:57:24 UT
Found 511 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 16 sources in
srclist catalog. Found 2 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.70 mag.
Found 4 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 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
19.17 mag. Found 56 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 8% of the Genie image region.
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?
634427849 294 U 270.63514 53.68212 15.68/17.7 0.8 srclist Yes
634427849 294 U 270.63515 53.68218 14.42/19.2 0.9 image Yes
List afterglow candidates for other finding charts.
634427637 82 WHITE 270.63480 53.68223 13.86/19.2 0.5 srclist Yes
634427637 82 WHITE 270.63501 53.68223 13.72/20.2 0.8 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 53.68218
GRB_ERROR: 0.61
GRB_RA: 270.63515
IMAGE_START_TIME: 21:57:24
MAGNITUDE: 14.42
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT