srclist overlap message for exposure 3 of trigger 1042398
uvot_overlap.pl vrs. 2010-12-20b fem started at 210411d21h11m06s330767usUT
The observation of trigger 1042398 started 2021-04-11T15:20:35.4
Examining file ./1042398_g883_uvot_sky_srclist.fits
The exposure ID is 639847235
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (296.5693,-39.3713) with a roll angle of 79.4
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (296.5590,-39.3730) with a radius of 3.000 arc min
This is 0.489 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 28.27 sq. arc min or 1.00 of the BAT error circle
The XRT error circle is centered at (296.6112,-39.3979) with a radius of 0.033 arc min
This is 2.515 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 3 of trigger 1042398
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210411d21h11m22s140462usUT
Observation start time is 2021-04-11T15:20:35.4
Examining file ./1042398_g883_uvot_catalog_srclist.fits
The exposure ID is 639847235
The exposure is 150.000 sec.
The bin size is 2 pixels
The filter is WHITE
There are 190 detected source(s) for 1042398_g883
*** WARNING -- the sources have filled the available telemetry buffer (190).
srclist_overlap returned: bat_overlap 1.000
srclist_overlap returned: xrt_overlap 1.000
Dimmest detected source in 1042398_g883 has mag 19.02
Aspect correction adds 0.00312 degrees (0.748 sec of time = 8.68 arc sec) to RA
Aspect correction adds 0.00083 degrees ( 2.99 arcsec) to Dec
Total aspect correction is 9.18 arcsec
Star catalogs centered at 296.5713 , -39.3698 with radius 8.84 arc min.
n_usno: 1866 n_gsc: 0
*** WARNING -- bright star catalog has 5 entries brighter than 12 mag
The brightest has mag 8.04488
RA DEC Mag Color
bright star 0: 296.61001 (19:46:26.40) -39.38318 (-39:22:59.5) 11.81 USNO-V
bright star 1: 296.63208 (19:46:31.70) -39.42547 (-39:25:31.7) 8.04 USNO-V
bright star 2: 296.64143 (19:46:33.94) -39.47118 (-39:28:16.2) 11.29 USNO-V
bright star 3: 296.45329 (19:45:48.79) -39.45165 (-39:27:05.9) 11.82 USNO-V
bright star 4: 296.38873 (19:45:33.30) -39.39247 (-39:23:32.9) 11.34 USNO-V
Mean distance difference (CAT_DELTA) for 148 matched entries is 0.653" for 1042398_g883
Mean and std. dev of mag. difference (MAG_DELTA) are 1.279 and 0.600 for 1042398_g883
Found 45 entries without IDs and 3 entries that are acceptable afterglow candidates for 1042398_g883.
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.
41 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=296.5590 (19:46:14.16) DEC=-39.3730 (-39:22:22.8)
XRT distances are from RA=296.6112 (19:46:26.69) DEC=-39.3979 (-39:23:52.6)
-----------------
Entry 20 in the list of sources is a candidate afterglow for 1042398_g883 with 1x1 stamp
ra=296.52465 (19:46:05.92) dec=-39.40623 (-39:24:22.4) +/- 1.1" mag=18.44+/-0.35
dist=242.6 REFID=182
*** The position of this source is inconsistent with the XRT position.
The position is 153.1 arc sec from the BAT position.
src: 20 distr. of nearby unmatched sources: 0 1 0 0 0
Found 6 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
296.5270 -39.4029 13.6 -1 USNO-B1 19.66 19.26 19.44
296.5301 -39.4087 17.6 -1 USNO-B1 19.27 18.40 18.79
296.5253 -39.4058 2.4 -1 USNO-B1 17.33 19.31 18.43 *
296.5264 -39.4072 6.0 -1 USNO-B1 99.99 19.70 99.99
296.5228 -39.4077 7.6 -1 USNO-B1 13.52 12.30 12.84 *
296.5226 -39.4109 18.0 -1 USNO-B1 20.31 19.48 19.85
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 25 in the list of sources is a candidate afterglow for 1042398_g883 with 3x3 stamp
ra=296.52205 (19:46:05.29) dec=-39.40795 (-39:24:28.6) +/- 1.1" mag=13.86+/-0.35
dist=250.6 REFID=8
*** The position of this source is inconsistent with the XRT position.
The position is 162.5 arc sec from the BAT position.
src: 25 distr. of nearby unmatched sources: 0 1 0 0 0
Found 4 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
296.5253 -39.4058 12.0 -1 USNO-B1 17.33 19.31 18.43
296.5264 -39.4072 12.4 -1 USNO-B1 99.99 19.70 99.99
296.5228 -39.4077 2.1 -1 USNO-B1 13.52 12.30 12.84 *
296.5226 -39.4109 10.9 -1 USNO-B1 20.31 19.48 19.85
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 30 in the list of sources is a candidate afterglow for 1042398_g883 with 1x1 stamp
ra=296.61160 (19:46:26.78) dec=-39.39793 (-39:23:52.5) +/- 1.1" mag=18.58+/-0.35
dist=1.1 REFID=180
src: 30 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
296.6069 -39.3968 13.7 -1 USNO-B1 18.58 17.23 17.83
296.6061 -39.4010 18.9 -1 USNO-B1 20.58 19.18 19.80
296.6073 -39.4023 19.7 -1 USNO-B1 20.29 19.39 19.79
##### This source remains a candidate #####
It has no entries 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:
Unmatched source ra=296.61160 (19:46:26.78) dec=-39.39793 (-39:23:52.5) +/- 1.1" mag=18.58+/-0.35 dist=1.1 REFID=180
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 19.22, 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 3 of trigger 1042398
------ Start for Possible Stand-alone Circular ----
In response to GRB210411 (Swift/BAT trigger 1042398) at 15:05:51 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of nominal 150.000 seconds with the White
filter starting 857 seconds after the BAT trigger. There is a candidate
afterglow in the list of sources generated on-board at
RA(J2000) = 19:46:26.78 = 296.61160
DEC(J2000) = -39:23:52.5 = -39.39793
with a 90%-confidence error radius of about 1.10 arc sec. This position is 1.1
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.58. No correction has been made for the expected extinction corresponding to
E(B-V) of 0.081.
------- notes for trigger 1042398 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210411d21h11m24s199003usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1042398
-expid=639847235 -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/1042398/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
*** Warning -- no exposure found, using srclist assumed value.
XRT position found for srclist. BAT position found.
UVOT exposure began at MET 639847235.41008 or about 2021:101:15:20:30 UT
Found 1862 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 16% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 45 srclist
source(s) without IDs. There are 1 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 19.22 mag.
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?
639847235 856 WHITE 296.61160 -39.39793 18.58/19.2 1.1 srclist Yes
639847235 856 ? image data are not available.
List afterglow candidates for other finding charts.
639846444 65 WHITE 296.61178 -39.39774 17.99/19.2 1.7 srclist Yes
639846444 65 WHITE image found no candidates.
639846656 277 U 296.61208 -39.39766 18.21/18.1 2.6 srclist Yes
639846656 277 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -39.39793
GRB_ERROR: 1.10
GRB_RA: 296.61160
IMAGE_START_TIME: 15:20:30
MAGNITUDE: 18.58
MAG_ERROR: 0.4
MESSAGE_TYPE: ACK
SOURCE: XRT