srclist overlap message for exposure 1 of trigger 829046
uvot_overlap.pl vrs. 2010-12-20b fem started at 180426d14h32m12s242451usUT
The observation of trigger 829046 started 2018-04-26T14:16:00.8
Examining file 829046_g3444_uvot_sky_srclist.fits
The exposure ID is 546444960
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (57.4586,-48.7753) with a roll angle of 334.9
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 (57.4590,-48.7820) with a radius of 3.000 arc min
This is 0.400 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
Could not find the location of an XRT error circle
srclist afterglow message for exposure 1 of trigger 829046
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180426d14h32m15s217181usUT
Observation start time is 2018-04-26T14:16:00.8
Examining file 829046_g3444_uvot_catalog_srclist.fits
The exposure ID is 546444960
The exposure is 150.000 sec.
The bin size is 2 pixels
The filter is WHITE
There are 14 detected source(s) for 829046_g3444
Aspect correction adds 0.00133 degrees (0.320 sec of time = 3.16 arc sec) to RA
Aspect correction adds 0.00013 degrees ( 0.46 arcsec) to Dec
Total aspect correction is 3.19 arcsec
Star catalogs centered at 57.4487 , -48.7713 with radius 5.95 arc min.
n_usno: 330 n_gsc: 307
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 11.0171
RA DEC Mag Color
bright star 0: 57.46222 (03:49:50.93) -48.72132 (-48:43:16.8) 11.02 GSC-F
bright star 1: 57.50543 (03:50:01.30) -48.69956 (-48:41:58.4) 11.30 USNO-R
bright star 2: 57.50741 (03:50:01.78) -48.69985 (-48:41:59.5) 11.77 USNO-B
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 11 matched entries is 0.915" for 829046_g3444
Mean and std. dev of mag. difference (MAG_DELTA) are 1.861 and 0.644 for 829046_g3444
Found 3 entries without IDs and 2 entries that are acceptable afterglow candidates for 829046_g3444.
Acceptable entries have no ID, BAT distance < 200" or XRT distance < 10", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
1 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=57.4590 (03:49:50.16) DEC=-48.7820 (-48:46:55.2)
XRT distances are as reported in catalog file.
-----------------
Entry 4 in the list of sources is a candidate afterglow for 829046_g3444 with 5x5 stamp
ra=57.52493 (03:50:05.98) dec=-48.78384 (-48:47:01.8) +/- 1.1" mag=19.79+/-0.35
dist=156.5 REFID=13
src: 4 distr. of nearby unmatched sources: 0 0 0 0 0
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
57.5201 -48.7828 12.1 -1 USNO-B1 22.48 20.84 21.57
57.5181 -48.7839 16.3 -1 GSC2.3 20.64 99.99 99.99
57.5201 -48.7827 12.3 -1 GSC2.3 20.40 21.89 99.99
57.5259 -48.7822 6.4 -1 GSC2.3 99.99 22.33 99.99
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 mag
-----------------
Entry 5 in the list of sources is a candidate afterglow for 829046_g3444 with 5x5 stamp
ra=57.49271 (03:49:58.25) dec=-48.73714 (-48:44:13.7) +/- 1.1" mag=19.63+/-0.35
dist=180.2 REFID=12
src: 5 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
57.4931 -48.7379 2.8 -1 USNO-B1 22.82 20.06 21.29 *
57.4846 -48.7365 19.5 -1 GSC2.3 99.99 99.99 99.99
57.4930 -48.7378 2.6 -1 GSC2.3 19.37 21.26 99.99 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 18.66, BAT distances < 200",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist paragraph message for exposure 1 of trigger 829046
------ Start for Possible Stand-alone Circular ----
In response to GRB180426 (Swift/BAT trigger 829046) at 13:18:35 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 3424 seconds after the BAT trigger. No credible afterglow
candidate has been found in the initial data products. Data from the 2.7'x2.7'
sub-image are not available at this time. The 8'x8' region for the list of
sources generated on-board covers 100% of the BAT error circle. The list of
sources is typically complete to about 18 mag. No correction has been made for
the expected extinction corresponding to E(B-V) of 0.01.
------- notes for trigger 829046 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180426d14h32m16s971890usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=829046
-expid=546444960 -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/829046/
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.
No XRT position found for srclist. BAT position found.
UVOT exposure began at MET 546444960.8002 or about 2018:116:14:15:55 UT
Found 326 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 14 sources in
srclist catalog. Found 3 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.66 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?
546444960 3424 WHITE 57.52493 -48.78384 19.79/18.7 156.5 srclist Yes
546444960 3424 ? image data are not available.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -48.78200
GRB_ERROR: 200
GRB_RA: 57.45900
IMAGE_START_TIME: 14:15:55
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT