image overlap message for exposure 1 of trigger 831888
uvot_overlap.pl vrs. 2010-12-20b fem started at 180511d09h06m14s728869usUT
The observation of trigger 831888 started 2018-05-11T08:59:50.3
Examining file 831888_g6250_uvot_sky_image.fits
The exposure ID is 547721990
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (214.5126,-62.4633) with a roll angle of 198.4
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 (214.5080,-62.4570) with a radius of 3.000 arc min
This is 0.397 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
Could not find the location of an XRT error circle
image afterglow message for exposure 1 of trigger 831888
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180511d09h06m15s612476usUT
Observation start time is 2018-05-11T08:59:50.3
Examining file 831888_g6250_uvot_catalog_image.fits
The exposure ID is 547721990
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 57 detected source(s) for 831888_g6250
Aspect correction adds 0.00026 degrees (0.062 sec of time = 0.43 arc sec) to RA
Aspect correction adds -0.00037 degrees (-1.32 arcsec) to Dec
Total aspect correction is 1.39 arcsec
Star catalogs centered at 214.5194 , -62.4618 with radius 2.70 arc min.
n_usno: 1004 n_gsc: 764
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 11.49448
RA DEC Mag Color
bright star 0: 214.58048 (14:18:19.32) -62.46487 (-62:27:53.5) 11.77 USNO-R
bright star 1: 214.48077 (14:17:55.39) -62.49029 (-62:29:25.0) 11.49 USNO-V
bright star 2: 214.55659 (14:18:13.58) -62.43976 (-62:26:23.1) 11.81 GSC-V
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 70 matched entries is 0.785" for 831888_g6250
Mean and std. dev of mag. difference (MAG_DELTA) are 1.377 and 0.730 for 831888_g6250
Found 2 entries without IDs and 1 entries that are acceptable afterglow candidates for 831888_g6250.
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=214.5080 (14:18:01.92) DEC=-62.4570 (-62:27:25.2)
XRT distances are as reported in catalog file.
-----------------
Entry 54 in the list of sources is a candidate afterglow for 831888_g6250 with genie
ra=214.47641 (14:17:54.34) dec=-62.47686 (-62:28:36.7) +/- 0.7" mag=19.56+/-0.17
dist=88.7 REFID=46 major=0.5 minor=0.3 flag=0
This source is near the edge of image (0.934)
Found 23 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
214.4869 -62.4744 19.5 -1 USNO-B1 99.99 20.30 99.99
214.4817 -62.4746 12.1 -1 USNO-B1 19.04 16.19 17.46
214.4750 -62.4751 6.9 -1 USNO-B1 99.99 18.91 99.99
214.4709 -62.4722 19.2 -1 USNO-B1 18.74 18.46 18.58
214.4790 -62.4798 11.5 -1 USNO-B1 19.76 21.40 20.67
214.4739 -62.4777 5.2 -1 USNO-B1 15.51 13.54 14.42 *
214.4689 -62.4745 15.0 -1 USNO-B1 99.99 17.66 99.99
214.4731 -62.4778 6.5 -1 USNO-B1 99.99 13.63 99.99
214.4681 -62.4745 16.3 -1 USNO-B1 99.99 17.50 99.99
214.4785 -62.4819 18.5 -1 USNO-B1 99.99 20.96 99.99
214.4750 -62.4816 17.2 -1 USNO-B1 21.00 18.98 19.88
214.4690 -62.4789 14.5 -1 USNO-B1 18.09 14.74 16.23
214.4747 -62.4821 19.0 -1 USNO-B1 19.93 19.85 19.89
214.4817 -62.4746 11.9 -1 GSC2.3 16.66 20.59 17.82
214.4749 -62.4750 7.3 -1 GSC2.3 18.84 21.62 99.99
214.4704 -62.4721 19.9 -1 GSC2.3 19.68 99.99 99.99
214.4786 -62.4797 10.9 -1 GSC2.3 19.88 22.19 99.99
214.4738 -62.4777 5.2 -1 GSC2.3 13.92 14.97 14.63 *
214.4686 -62.4744 15.7 -1 GSC2.3 18.16 99.99 99.99
214.4730 -62.4783 7.6 -1 GSC2.3 15.63 99.99 99.99
214.4782 -62.4819 18.4 -1 GSC2.3 19.17 21.61 99.99
214.4747 -62.4815 17.0 -1 GSC2.3 18.90 21.13 99.99
214.4682 -62.4790 15.7 -1 GSC2.3 15.03 17.73 16.02
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
There are 67017.750 counts in the bkg source region of 4581.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 14.630 counts/pixel (5-sig UL in 4" is 19.89 mag) for 831888_g6250
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.89, BAT distances < 200",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 831888_547721990_180511d09h06m15s612476usUT_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(214.5126,-62.4633,45")
fk5;-circle(214.512380286213,-62.4605164095196,6")
fk5;-circle(214.498159282203,-62.457269476972,6")
fk5;-circle(214.503409612935,-62.46146389509,6")
fk5;-circle(214.5081170345,-62.4517527220604,6")
fk5;-circle(214.499500543023,-62.4628452814664,6")
fk5;-circle(214.500971771744,-62.4664309526765,6")
fk5;-circle(214.530011640947,-62.4581339649456,6")
fk5;-circle(214.521656911231,-62.4650896101366,6")
fk5;-circle(214.528901742842,-62.4623596236977,6")
fk5;-circle(214.492946884453,-62.4669127303512,6")
fk5;-circle(214.520879947392,-62.4686467464469,6")
fk5;-circle(214.538879107248,-62.461989312535,6")
fk5;-circle(214.515744172875,-62.4725826041255,6")
fk5;-circle(214.538184579735,-62.4651237759727,6")
fk5;-circle(214.531666605362,-62.4690293404197,6")
fk5;-circle(214.489765896739,-62.4709778921833,6")
fk5;-circle(214.525930731033,-62.4726888097182,6")
fk5;-circle(214.498809732661,-62.4750872399411,6")
fk5;-circle(214.506642242383,-62.4766877678827,6")
image paragraph message for exposure 1 of trigger 831888
SRCLIST PROBLEM: access to all star catalogs failed
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB180511 (Swift/BAT trigger 831888) at 07:15:39 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 6230 seconds after the BAT trigger. WARNING -- access to star catalogs
failed. This candidate should be verified before reporting. There is a
candidate afterglow in the list of sources generated on-board at
RA(J2000) = 14:18:07.20 = 214.52999
DEC(J2000) = -62:26:19.9 = -62.43887
with a 90%-confidence error radius of about 1.10 arc sec. This position is 74.8
arc sec. from the center of the BAT error circle. The estimated magnitude is
18.18. No correction has been made for the large, but uncertain, extinction
expected.
------- notes for trigger 831888 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180511d09h06m17s272248usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=831888
-expid=547721990 -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/831888/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for bat position. No XRT position found for
srclist. No XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 547721990.34476 or about 2018:131:08:59:45 UT
Found 5000 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 89% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 16 srclist
source(s) without IDs. There are 1 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.66 mag.
Found 57 source(s) in Genie image catalog. Found 2 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.89 mag. Found 1000 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
95% 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?
547721990 6230 WHITE 214.52999 -62.43887 18.18/18.7 74.8 srclist Yes
547721990 6230 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -62.43887
GRB_ERROR: 1.10
GRB_RA: 214.52999
IMAGE_START_TIME: 08:59:45
MAGNITUDE: 18.18
MAG_ERROR: 0.4
MESSAGE_TYPE: ACK
SOURCE: BAT