image overlap message for exposure 2 of trigger 874334
uvot_overlap.pl vrs. 2010-12-20b fem started at 181202d09h16m46s569412usUT
The observation of trigger 874334 started 2018-12-02T06:42:28.2
Examining file ./874334_g363_uvot_sky_image.fits
The exposure ID is 565425748
The exposure time is 249.935 (seconds)
The filter is B.
The uvot region is centered at (280.7429,27.9470) with a roll angle of 215.4
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 (280.7450,27.9510) with a radius of 3.000 arc min
This is 0.264 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 (280.7349,27.9596) with a radius of 0.030 arc min
This is 0.868 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
image afterglow message for exposure 2 of trigger 874334
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181202d09h17m10s912715usUT
Observation start time is 2018-12-02T06:42:28.2
Examining file ./874334_g363_uvot_catalog_image.fits
The exposure ID is 565425748
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is B
There are 29 detected source(s) for 874334_g363
Aspect correction adds -0.00074 degrees (-0.178 sec of time = -2.35 arc sec) to RA
Aspect correction adds 0.00014 degrees ( 0.49 arcsec) to Dec
Total aspect correction is 2.40 arcsec
Star catalogs centered at 280.7399 , 27.9456 with radius 2.67 arc min.
n_usno: 255 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 8.59752
RA DEC Mag Color
bright star 0: 280.69605 (18:42:47.05) 27.95753 (+27:57:27.1) 8.60 USNO-V
Mean distance difference (CAT_DELTA) for 28 matched entries is 0.567" for 874334_g363
Mean and std. dev of mag. difference (MAG_DELTA) are 0.946 and 0.910 for 874334_g363
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 874334_g363.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=280.7450 (18:42:58.80) DEC=27.9510 (+27:57:03.6)
XRT distances are from RA=280.7349 (18:42:56.38) DEC=27.9596 (+27:57:34.7)
-----------------
Entry 5 in the list of sources is a candidate afterglow for 874334_g363 with genie
ra=280.74280 (18:42:58.27) dec=27.94500 (+27:56:42.0) +/- 0.6" mag=17.65+/-0.15
dist=58.4 REFID=21 major=0.9 minor=0.8 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 22.7 arc sec from the BAT position.
Found 5 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
280.7421 27.9455 3.0 -1 USNO-B1 15.65 14.21 14.85 *
280.7418 27.9482 11.8 -1 USNO-B1 17.87 16.66 17.20
280.7405 27.9496 18.2 -1 USNO-B1 17.00 16.05 16.47
280.7381 27.9418 19.0 -1 USNO-B1 20.52 19.55 19.98
280.7484 27.9474 19.8 -1 USNO-B1 20.56 19.58 20.02
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 11 in the list of sources is a candidate afterglow for 874334_g363 with genie
ra=280.73483 (18:42:56.36) dec=27.95982 (+27:57:35.4) +/- 0.8" mag=19.88+/-0.23
dist=0.7 REFID=5 major=0.8 minor=0.7 flag=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
280.7399 27.9566 19.8 -1 USNO-B1 20.48 19.61 19.99
280.7306 27.9557 19.9 -1 USNO-B1 19.66 18.09 18.79
280.7397 27.9596 15.5 -1 USNO-B1 21.48 18.98 20.09
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
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=280.73483 (18:42:56.36) dec=27.95982 (+27:57:35.4) +/- 0.8" mag=19.88+/-0.23 dist=0.7 REFID=5 flag=0
There are 61371.313 counts in the bkg source region of 5091.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 12.055 counts/pixel (5-sig UL in 4" is 19.89 mag) for 874334_g363
There are 701.73621 counts in the src source region of 49.000000 pixels.
Rate in src region with 4 arcsec radius is 14.321 counts/pixel for 874334_g363
source too far from center -- do not compute local background.
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 20.45, 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: 874334_565425748_181202d09h17m10s912715usUT_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(280.7429,27.9470,45")
fk5;-circle(280.741968212011,27.9481910227751,6")
fk5;-circle(280.740450392111,27.9496339847676,6")
fk5;-circle(280.750440188141,27.950047583016,6")
fk5;-circle(280.746091799438,27.9558512090913,6")
fk5;-circle(280.741613193507,27.9458490165384,6")
fk5;-circle(280.742795988049,27.944996835519,6")
fk5;-circle(280.751964635871,27.9493146256282,6")
fk5;-circle(280.737675409443,27.9518671742453,6")
fk5;-circle(280.749451605733,27.9562879518369,6")
fk5;-circle(280.753508116033,27.9434754846169,6")
fk5;-circle(280.732126859578,27.9527702955117,6")
fk5;-circle(280.758039771777,27.9443816695836,6")
fk5;-circle(280.734924314966,27.9386752232266,6")
fk5;-circle(280.749959629686,27.9355809254239,6")
Region file: 874334_565425748_181202d09h17m10s912715usUT_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(280.734829256533,27.9598233123702,4")
image paragraph message for exposure 2 of trigger 874334
------ Start for Possible Stand-alone Circular ----
In response to GRB181202 (Swift/BAT trigger 874334) at 06:36:24 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the B filter starting
341 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:42:56.36 = 280.73483
DEC(J2000) = +27:57:35.4 = 27.95982
with a 90%-confidence error radius of about 0.82 arc sec. This position is 0.7
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.88 with a 1-sigma error of about 0.23. No correction has been made for the
expected extinction of about 0.6 magnitudes.
------- notes for trigger 874334 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181202d09h17m17s520408usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=874334
-expid=565425748 -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/874334/
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 565425748.19914 or about 2018:336:06:42:23 UT
Found 1434 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 25% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 58 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 29 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
20.45 mag. Found 251 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 24% of the Genie image region. The
closest srclist source has ra= 280.7321 dec= 27.9527 mag=16.69 sep=26.50".
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?
565425748 341 B srclist found no candidates.
565425748 341 B 280.73483 27.95982 19.88/20.4 0.7 image Yes
List afterglow candidates for other finding charts.
565425492 85 U 280.73498 27.95963 17.89/18.1 0.2 srclist Yes
565425492 85 U 280.73490 27.95973 17.67/20.1 0.3 image Yes
565426275 868 U srclist found no candidates.
565426275 868 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: b
GRB_DEC: 27.95982
GRB_ERROR: 0.82
GRB_RA: 280.73483
IMAGE_START_TIME: 06:42:23
MAGNITUDE: 19.88
MAG_ERROR: 0.23
MESSAGE_TYPE: ACK
SOURCE: XRT