image overlap message for exposure 1 of trigger 831816
uvot_overlap.pl vrs. 2010-12-20b fem started at 180511d00h23m28s409846usUT
The observation of trigger 831816 started 2018-05-10T21:05:16.9
Examining file ./831816_g2973_uvot_sky_image.fits
The exposure ID is 547679116
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (77.9876,-62.3310) with a roll angle of 331.2
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 (77.9890,-62.3350) with a radius of 3.000 arc min
This is 0.242 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 (77.9690,-62.3241) with a radius of 0.025 arc min
This is 0.665 arc min from the center of the uvot region
The area of the XRT error circle is 0.002 sq. arc min
The UVOT/XRT overlap is 0.002 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 831816
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180511d00h23m31s620400usUT
Observation start time is 2018-05-10T21:05:16.9
Examining file ./831816_g2973_uvot_catalog_image.fits
The exposure ID is 547679116
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 7 detected source(s) for 831816_g2973
Aspect correction adds 0.00077 degrees (0.185 sec of time = 1.29 arc sec) to RA
Aspect correction adds -0.00017 degrees (-0.63 arcsec) to Dec
Total aspect correction is 1.43 arcsec
Star catalogs centered at 77.9731 , -62.3341 with radius 2.32 arc min.
n_usno: 132 n_gsc: 138
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 5 matched entries is 0.511" for 831816_g2973
Mean and std. dev of mag. difference (MAG_DELTA) are 0.764 and 0.388 for 831816_g2973
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 831816_g2973.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=77.9890 (05:11:57.36) DEC=-62.3350 (-62:20:06.0)
XRT distances are from RA=77.9690 (05:11:52.56) DEC=-62.3241 (-62:19:26.8)
*** WARNING 28 per cent of entries have no IDs.
-----------------
Entry 4 in the list of sources is a candidate afterglow for 831816_g2973 with genie
ra=77.96932 (05:11:52.64) dec=-62.32396 (-62:19:26.2) +/- 0.8" mag=18.25+/-0.15
dist=0.8 REFID=5 major=1.3 minor=1.0 flag=0
Found 7 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
77.9755 -62.3257 12.1 -1 USNO-B1 21.39 20.38 20.83
77.9795 -62.3233 17.1 -1 USNO-B1 14.70 14.03 14.33
77.9598 -62.3229 16.3 -1 USNO-B1 21.64 20.13 20.80
77.9660 -62.3197 16.3 -1 USNO-B1 21.05 19.05 19.94
77.9793 -62.3233 16.9 -1 GSC2.3 13.81 14.64 14.18
77.9595 -62.3228 16.9 -1 GSC2.3 99.99 22.07 99.99
77.9671 -62.3204 13.5 -1 GSC2.3 20.23 21.76 99.99
uvot_check_outside found 12 of 12 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 6 in the list of sources is a candidate afterglow for 831816_g2973 with genie
ra=77.93923 (05:11:45.42) dec=-62.31885 (-62:19:07.9) +/- 0.8" mag=18.15+/-0.15
dist=53.3 REFID=2 major=0.7 minor=0.3 flag=24 (truncated+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 101.5 arc sec from the BAT position.
This source is near the edge of image (1.037)
Found 7 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
77.9481 -62.3205 16.0 -1 USNO-B1 20.68 19.63 20.10
77.9386 -62.3196 2.9 -1 USNO-B1 15.78 15.15 15.43 *
77.9372 -62.3142 17.2 -1 USNO-B1 21.32 20.13 20.66
77.9436 -62.3227 15.6 -1 GSC2.3 20.06 21.81 99.99
77.9476 -62.3203 14.9 -1 GSC2.3 19.87 20.91 99.99
77.9384 -62.3195 2.8 -1 GSC2.3 15.13 15.86 15.44 *
77.9366 -62.3145 16.4 -1 GSC2.3 99.99 21.78 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=77.96932 (05:11:52.64) dec=-62.32396 (-62:19:26.2) +/- 0.8" mag=18.25+/-0.15 dist=0.8 REFID=5 flag=0
There are 1.5471486E+05 counts in the bkg source region of 5744.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 26.935 counts/pixel (5-sig UL in 4" is 19.56 mag) for 831816_g2973
There are 1980.8170 counts in the src source region of 52.000000 pixels.
Rate in src region with 4 arcsec radius is 38.093 counts/pixel for 831816_g2973
There are 31081.547 counts in the cand_src_bkg source region of 1166.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 26.657 counts/pixel (5-sig UL in 4" is 19.57 mag) for 831816_g2973
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 20.12, 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: 831816_547679116_180511d00h23m31s620400usUT_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(77.9876,-62.3310,45")
fk5;-circle(77.9959029044269,-62.336658360473,6")
fk5;-circle(78.0069884212092,-62.334598845035,6")
fk5;-circle(77.9794801093131,-62.3231904638982,6")
fk5;-circle(77.969319519921,-62.3239551944469,6")
fk5;-circle(77.9916095710851,-62.3202626882291,6")
Region file: 831816_547679116_180511d00h23m31s620400usUT_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(77.969319519921,-62.3239551944469,4")
Region file: 831816_547679116_180511d00h23m31s620400usUT_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(77.969319519921,-62.3239551944469,25")
fk5;-circle(77.969319519921,-62.3239551944469,15")
fk5;-circle(77.9794801093131,-62.3231904638982,6")
image paragraph message for exposure 1 of trigger 831816
------ Start for Possible Stand-alone Circular ----
In response to GRB180510 (Swift/BAT trigger 831816) at 20:15:42 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 2953 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 05:11:52.64 = 77.96932
DEC(J2000) = -62:19:26.3 = -62.32396
with a 90%-confidence error radius of about 0.76 arc sec. This position is 0.8
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.25 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.03.
------- notes for trigger 831816 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180511d00h23m34s801993usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=831816
-expid=547679116 -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/831816/
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 547679116.92366 or about 2018:130:21:05:11 UT
Found 876 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 19% of the srclist region. Found 37 sources in
srclist catalog. Found 6 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 7 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 2 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.12 mag. Found 138 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 17% 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?
547679116 2952 WHITE 77.96970 -62.32402 18.75/19.2 1.2 srclist Yes
547679116 2952 WHITE 77.96932 -62.32396 18.25/20.1 0.8 image Yes
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -62.32396
GRB_ERROR: 0.76
GRB_RA: 77.96932
IMAGE_START_TIME: 21:05:11
MAGNITUDE: 18.25
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT