srclist overlap message for exposure 1 of trigger 821103


uvot_overlap.pl vrs. 2010-12-20b fem started at 180402d11h02m00s749639usUT

The observation of trigger 821103 started 2018-04-02T09:47:39.9
Examining file ./821103_g159_uvot_sky_srclist.fits
The exposure ID is 544355259
The exposure time is undefined.
The filter is U.

The uvot region is centered at (251.9102,-14.9613) with a roll angle of 92.9
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 (251.9050,-14.9630) with a radius of 3.000 arc min
This is 0.316 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 (251.9336,-14.9686) with a radius of 0.035 arc min
This is 1.424 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle



srclist afterglow message for exposure 1 of trigger 821103


find_uvot_ag.pl vrs. 2017-02-17 fem started at 180402d11h02m05s456035usUT

Observation start time is 2018-04-02T09:47:39.9
Examining file ./821103_g159_uvot_catalog_srclist.fits
The exposure ID is 544355259
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 63 detected source(s) for 821103_g159
Aspect correction adds 0.00122 degrees (0.294 sec of time = 4.26 arc sec) to RA
Aspect correction adds 0.00201 degrees ( 7.24 arcsec) to Dec
Total aspect correction is 8.40 arcsec
Star catalogs centered at 251.9151 , -14.9571 with radius 8.24 arc min.
n_usno: 1518 n_gsc: 1844
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.23956
                        RA                      DEC              Mag  Color
bright star  0: 251.86794 (16:47:28.31) -14.90033 (-14:54:01.2) 11.24 USNO-V
Mean distance difference (CAT_DELTA) for 58 matched entries is 0.851" for 821103_g159
Mean and std. dev of mag. difference (MAG_DELTA) are 1.723 and 0.542 for 821103_g159
Found 7 entries without IDs and 1 entries that are acceptable afterglow candidates for 821103_g159.
Acceptable entries have no ID, XRT distances < 5.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
3 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=251.9050 (16:47:37.20) DEC=-14.9630 (-14:57:46.8)
XRT distances are from RA=251.9336 (16:47:44.06) DEC=-14.9686 (-14:58:06.9)

-----------------
Entry 8 in the list of sources is a candidate afterglow for 821103_g159 with 3x3 stamp
 ra=251.87537 (16:47:30.09) dec=-14.93811 (-14:56:17.2) +/- 1.1" mag=19.29+/-0.35
 dist=230.3 REFID=61
*** The position of this source is inconsistent with the XRT position.
    The position is 138.9 arc sec from the BAT position.
 src: 8 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 
  251.8760 -14.9382   2.2    -1 USNO-B1  18.60  16.97  17.69 *
  251.8740 -14.9390   5.6    -1 USNO-B1  19.50  17.56  18.42
  251.8760 -14.9382   2.1    -1 GSC2.3   16.93  18.44  99.99 *
  251.8739 -14.9390   6.0    -1 GSC2.3   17.74  19.56  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

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
251.9319 -14.9691 6.3 -1 USNO-B1 19.84 18.04 18.83
251.9319 -14.9692 6.3 -1 GSC2.3 18.23 19.78 99.99
The closest star is 6.26" away.

List UVOT sources within 10" of the XRT position:

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 18.12, XRT distances < 5.25",
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 821103


IMAGE PROBLEM: no overlap

------ Start for Possible Stand-alone Circular ----

In response to GRB180402 (Swift/BAT trigger 821103) at 09:44:59 UT,

---- UVOT paragraph for Joint or Stand-alone Circular ----

UVOT took a finding chart exposure of 250 seconds with the U filter starting
139 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 0.77.

------- notes for trigger 821103 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180402d11h02m09s987072usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=821103
-expid=544355259 -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/821103/
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 544355259.91068 or about 2018:092:09:47:34 UT

Found 1833 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 18% of the srclist region. Found 63 sources in
srclist catalog. Found 7 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 9 source(s) in Genie image catalog. Found 0 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.22 mag. Found 147 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 17% of the
Genie image region.

Genie image analysis:
Found 27656.3 counts in the large background region of 6306.0 pixels or a rate
of 4.386 counts/pixel in a radius of 45.0 arcsec. Based on this background, the
typical 5-sigma UL at a random point in the Genie image is 19.70 mag. for a
4-arcsec aperture. The closest srclist source has ra= 251.9328 dec= -14.9795
mag=18.57 sep=39.42". The closest Genie source has ra= 251.9244 dec= -14.9609
mag=19.51 sep=42.15".

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?
544355259  139 U srclist found no candidates.
544355259  139 U image found no candidates.
List afterglow candidates for other finding charts.
544355993  873 U srclist found no candidates.
544355993  873 U image found no candidates.
544359448 4328 WHITE srclist found no candidates.
544359448 4328 ? image data are not available.

------- Tokens for Quick GCN -------

CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -14.96858
GRB_ERROR: 5.25
GRB_RA: 251.93358
IMAGE_START_TIME: 09:47:34
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT