image overlap message for exposure 1 of trigger 889483
uvot_overlap.pl vrs. 2010-12-20b fem started at 190218d09h25m02s387964usUT
The observation of trigger 889483 started 2019-02-18T09:03:35.3
Examining file 889483_g565_uvot_sky_image.fits
The exposure ID is 572173415
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (284.6457,-8.2367) with a roll angle of 98.3
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 (284.6400,-8.2350) with a radius of 3.000 arc min
This is 0.353 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 (284.6439,-8.2374) with a radius of 0.065 arc min
This is 0.115 arc min from the center of the uvot region
The area of the XRT error circle is 0.013 sq. arc min
The UVOT/XRT overlap is 0.013 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 889483
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190218d09h25m04s849320usUT
Observation start time is 2019-02-18T09:03:35.3
Examining file 889483_g565_uvot_catalog_image.fits
The exposure ID is 572173415
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 65 detected source(s) for 889483_g565
Aspect correction adds 0.00087 degrees (0.209 sec of time = 3.10 arc sec) to RA
Aspect correction adds -0.00113 degrees (-4.05 arcsec) to Dec
Total aspect correction is 5.10 arcsec
Star catalogs centered at 284.6445 , -8.2380 with radius 2.71 arc min.
n_usno: 1126 n_gsc: 0
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 10.8721
RA DEC Mag Color
bright star 0: 284.66356 (18:58:39.25) -8.27522 (-08:16:30.8) 11.61 USNO-R
bright star 1: 284.66454 (18:58:39.49) -8.27599 (-08:16:33.5) 10.87 USNO-V
bright star 2: 284.60449 (18:58:25.08) -8.25592 (-08:15:21.3) 11.31 USNO-V
Mean distance difference (CAT_DELTA) for 65 matched entries is 0.746" for 889483_g565
Mean and std. dev of mag. difference (MAG_DELTA) are 1.027 and 0.549 for 889483_g565
Found 5 entries without IDs and 5 entries that are acceptable afterglow candidates for 889483_g565.
Acceptable entries have no ID, XRT distances < 9.75", 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=284.6400 (18:58:33.60) DEC=-8.2350 (-08:14:06.0)
XRT distances are from RA=284.6439 (18:58:34.54) DEC=-8.2374 (-08:14:14.6)
-----------------
Entry 6 in the list of sources is a candidate afterglow for 889483_g565 with genie
ra=284.64544 (18:58:34.91) dec=-8.23745 (-08:14:14.8) +/- 0.6" mag=16.34+/-0.14
dist=5.5 REFID=36 major=1.0 minor=1.0 flag=0
Found 14 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
284.6444 -8.2386 5.6 -1 USNO-B1 18.81 17.37 18.01
284.6423 -8.2370 11.3 -1 USNO-B1 17.81 16.52 17.10
284.6440 -8.2357 8.3 -1 USNO-B1 16.05 15.07 15.51
284.6450 -8.2350 9.0 -1 USNO-B1 16.98 16.66 16.80
284.6450 -8.2418 15.9 -1 USNO-B1 15.76 14.94 15.30
284.6403 -8.2374 18.2 -1 USNO-B1 19.11 17.01 17.94
284.6475 -8.2347 12.4 -1 USNO-B1 20.16 19.41 19.75
284.6471 -8.2341 13.4 -1 USNO-B1 19.56 19.73 19.66
284.6485 -8.2412 17.4 -1 USNO-B1 99.99 19.79 99.99
284.6497 -8.2380 15.5 -1 USNO-B1 16.76 15.78 16.21
284.6437 -8.2327 18.2 -1 USNO-B1 18.83 17.39 18.03
284.6492 -8.2408 18.1 -1 USNO-B1 19.95 19.30 19.59
284.6502 -8.2363 17.6 -1 USNO-B1 20.45 17.62 18.88
284.6446 -8.2321 19.3 -1 USNO-B1 17.64 16.64 17.09
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 40 in the list of sources is a candidate afterglow for 889483_g565 with genie
ra=284.64988 (18:58:35.97) dec=-8.25142 (-08:15:05.1) +/- 0.6" mag=16.01+/-0.14
dist=54.8 REFID=55 major=1.0 minor=0.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 68.8 arc sec from the BAT position.
Found 15 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
284.6489 -8.2472 15.6 -1 USNO-B1 21.86 20.93 21.34
284.6475 -8.2479 15.4 -1 USNO-B1 20.27 19.48 19.83
284.6460 -8.2506 14.2 -1 USNO-B1 20.94 20.40 20.64
284.6460 -8.2513 13.7 -1 USNO-B1 19.95 18.80 19.31
284.6531 -8.2497 13.0 -1 USNO-B1 19.02 17.88 18.39
284.6488 -8.2520 4.3 -1 USNO-B1 13.77 12.71 13.18
284.6456 -8.2535 16.9 -1 USNO-B1 18.38 17.30 17.77
284.6490 -8.2531 6.9 -1 USNO-B1 19.68 18.28 18.90
284.6550 -8.2500 18.9 -1 USNO-B1 20.33 20.46 20.40
284.6522 -8.2530 10.1 -1 USNO-B1 19.59 18.58 19.03
284.6529 -8.2529 11.9 -1 USNO-B1 19.09 17.79 18.37
284.6536 -8.2530 14.5 -1 USNO-B1 20.23 20.93 20.62
284.6480 -8.2554 15.8 -1 USNO-B1 18.76 17.52 18.07
284.6511 -8.2545 12.0 -1 USNO-B1 19.89 19.32 19.57
284.6523 -8.2548 14.8 -1 USNO-B1 20.14 19.27 19.66
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 41 in the list of sources is a candidate afterglow for 889483_g565 with genie
ra=284.64790 (18:58:35.50) dec=-8.25245 (-08:15:08.8) +/- 0.6" mag=15.91+/-0.14
dist=56.0 REFID=56 major=0.9 minor=0.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 68.8 arc sec from the BAT position.
Found 13 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
284.6489 -8.2472 19.4 -1 USNO-B1 21.86 20.93 21.34
284.6475 -8.2479 16.6 -1 USNO-B1 20.27 19.48 19.83
284.6460 -8.2506 9.7 -1 USNO-B1 20.94 20.40 20.64
284.6460 -8.2513 7.9 -1 USNO-B1 19.95 18.80 19.31
284.6488 -8.2520 3.7 -1 USNO-B1 13.77 12.71 13.18
284.6456 -8.2535 8.9 -1 USNO-B1 18.38 17.30 17.77
284.6490 -8.2531 4.8 -1 USNO-B1 19.68 18.28 18.90
284.6522 -8.2530 15.5 -1 USNO-B1 19.59 18.58 19.03
284.6529 -8.2529 17.8 -1 USNO-B1 19.09 17.79 18.37
284.6480 -8.2554 10.5 -1 USNO-B1 18.76 17.52 18.07
284.6511 -8.2545 13.6 -1 USNO-B1 19.89 19.32 19.57
284.6523 -8.2548 17.7 -1 USNO-B1 20.14 19.27 19.66
284.6481 -8.2575 18.3 -1 USNO-B1 18.23 16.64 17.35
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 43 in the list of sources is a candidate afterglow for 889483_g565 with genie
ra=284.64922 (18:58:35.81) dec=-8.21777 (-08:13:04.0) +/- 0.6" mag=16.63+/-0.14
dist=73.2 REFID=8 major=0.9 minor=0.7 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 70.2 arc sec from the BAT position.
Found 17 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
284.6467 -8.2223 18.6 -1 USNO-B1 19.82 19.01 19.37
284.6483 -8.2222 16.3 -1 USNO-B1 20.01 19.37 19.65
284.6476 -8.2220 16.2 -1 USNO-B1 20.28 19.27 19.72
284.6450 -8.2205 17.9 -1 USNO-B1 20.04 18.99 19.45
284.6516 -8.2215 15.9 -1 USNO-B1 16.67 15.07 15.78
284.6503 -8.2199 8.4 -1 USNO-B1 20.33 18.36 19.23
284.6500 -8.2194 6.4 -1 USNO-B1 20.92 18.14 19.37
284.6445 -8.2186 16.9 -1 USNO-B1 20.82 19.40 20.03
284.6537 -8.2201 18.0 -1 USNO-B1 20.23 19.14 19.63
284.6460 -8.2171 11.9 -1 USNO-B1 17.15 15.23 16.09
284.6449 -8.2165 16.1 -1 USNO-B1 18.66 16.96 17.71
284.6492 -8.2166 4.1 -1 USNO-B1 13.17 11.35 12.16 *
284.6480 -8.2159 8.0 -1 USNO-B1 15.12 19.62 17.62
284.6544 -8.2178 18.4 -1 USNO-B1 20.65 20.68 20.67
284.6507 -8.2145 13.0 -1 USNO-B1 18.06 16.77 17.34
284.6503 -8.2141 13.6 -1 USNO-B1 19.36 17.90 18.55
284.6517 -8.2129 19.6 -1 USNO-B1 16.85 15.70 16.21
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 65 in the list of sources is a candidate afterglow for 889483_g565 with genie
ra=284.66613 (18:58:39.87) dec=-8.23012 (-08:13:48.4) +/- 0.6" mag=18.32+/-0.15
dist=83.4 REFID=25 major=0.9 minor=0.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 94.8 arc sec from the BAT position.
Found 15 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
284.6619 -8.2324 17.2 -1 USNO-B1 20.33 18.75 19.45
284.6624 -8.2330 16.9 -1 USNO-B1 18.82 17.43 18.05
284.6610 -8.2293 18.6 -1 USNO-B1 18.70 17.50 18.04
284.6639 -8.2344 17.2 -1 USNO-B1 19.66 18.16 18.83
284.6637 -8.2297 8.9 -1 USNO-B1 18.96 99.99 99.99
284.6654 -8.2331 10.8 -1 USNO-B1 17.81 17.02 17.37
284.6646 -8.2301 5.3 -1 USNO-B1 15.66 14.13 14.81
284.6661 -8.2330 10.5 -1 USNO-B1 18.34 17.77 18.02
284.6636 -8.2266 15.5 -1 USNO-B1 20.28 20.34 20.31
284.6658 -8.2313 4.6 -1 USNO-B1 20.00 15.41 17.45
284.6640 -8.2270 13.7 -1 USNO-B1 19.63 20.93 20.35
284.6675 -8.2331 11.9 -1 USNO-B1 18.56 17.94 18.22
284.6668 -8.2272 10.7 -1 USNO-B1 15.05 14.04 14.49
284.6661 -8.2248 19.0 -1 USNO-B1 17.61 16.66 17.08
284.6697 -8.2301 12.8 -1 USNO-B1 19.71 18.91 19.27
*** If XRT position is correct, then this is NOT the afterglow
Found 4 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
284.6444 -8.2386 4.9 -1 USNO-B1 18.81 17.37 18.01
284.6423 -8.2370 5.8 -1 USNO-B1 17.81 16.52 17.10
284.6440 -8.2357 6.3 -1 USNO-B1 16.05 15.07 15.51
284.6450 -8.2350 9.6 -1 USNO-B1 16.98 16.66 16.80
The closest star is 4.88" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=284.64399 (18:58:34.56) dec=-8.23546 (-08:14:07.7) +/- 0.6" mag=18.02+/-0.15 dist=7.0 REFID=33 flag=0
Unmatched source ra=284.64544 (18:58:34.91) dec=-8.23745 (-08:14:14.8) +/- 0.6" mag=16.34+/-0.14 dist=5.5 REFID=36 flag=0
There are 1.5248463E+05 counts in the bkg source region of 4444.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 34.312 counts/pixel (5-sig UL in 4" is 19.43 mag) for 889483_g565
There are 4672.6812 counts in the src source region of 51.000000 pixels.
Rate in src region with 4 arcsec radius is 91.621 counts/pixel for 889483_g565
There are 27806.842 counts in the cand_src_bkg source region of 809.00000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 34.372 counts/pixel (5-sig UL in 4" is 19.43 mag) for 889483_g565
There are 3 candidate(s) outside XRT error circle with mag < 19.42
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.98, XRT distances < 9.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 889483_572173415_190218d09h25m04s849320usUT_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(284.6457,-8.2367,45")
fk5;-circle(284.640405020324,-8.23493278727745,6")
fk5;-circle(284.637450459812,-8.23360788856375,6")
fk5;-circle(284.639163248303,-8.23880851564882,6")
fk5;-circle(284.643990015653,-8.23546106703739,6")
fk5;-circle(284.644720729545,-8.23210929185158,6")
fk5;-circle(284.634414787462,-8.23668493978592,6")
fk5;-circle(284.645443089875,-8.23744986610276,6")
fk5;-circle(284.643540567914,-8.22975049625733,6")
fk5;-circle(284.638993523528,-8.22835107594317,6")
fk5;-circle(284.635260683405,-8.23991622980509,6")
fk5;-circle(284.644877840533,-8.24203655500733,6")
fk5;-circle(284.644434687091,-8.22581199414434,6")
fk5;-circle(284.649999852783,-8.23799032490881,6")
fk5;-circle(284.638816102582,-8.24686745116465,6")
fk5;-circle(284.651892689978,-8.23169125026851,6")
fk5;-circle(284.654560196051,-8.22911495498402,6")
fk5;-circle(284.656050541526,-8.23651483103016,6")
fk5;-circle(284.656959584628,-8.23163591711607,6")
fk5;-circle(284.65476347218,-8.22604151218829,6")
fk5;-circle(284.654357752698,-8.2479758712106,6")
Region file: 889483_572173415_190218d09h25m04s849320usUT_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(284.645443089875,-8.23744986610276,4")
Region file: 889483_572173415_190218d09h25m04s849320usUT_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(284.645443089875,-8.23744986610276,25")
fk5;-circle(284.645443089875,-8.23744986610276,15")
fk5;-circle(284.640405020324,-8.23493278727745,6")
fk5;-circle(284.639163248303,-8.23880851564882,6")
fk5;-circle(284.644720729545,-8.23210929185158,6")
fk5;-circle(284.643540567914,-8.22975049625733,6")
fk5;-circle(284.644877840533,-8.24203655500733,6")
fk5;-circle(284.649999852783,-8.23799032490881,6")
fk5;-circle(284.651892689978,-8.23169125026851,6")
image paragraph message for exposure 1 of trigger 889483
Catalogued source 4.9" from XRT position may affect AG photometry.
------ Start for Possible Stand-alone Circular ----
In response to GRB190218 (Swift/BAT trigger 889483) at 08:54:09 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 543 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:58:34.91 = 284.64544
DEC(J2000) = -08:14:14.8 = -8.23745
with a 90%-confidence error radius of about 0.61 arc sec. This position is 5.5
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.34 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.26.
------- notes for trigger 889483 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190218d09h25m09s959428usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=889483
-expid=572173415 -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/889483/
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 572173415.31084 or about 2019:049:09:03:30 UT
Found 4958 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 104% of the srclist region. Found 190 sources
in srclist catalog. WARNING -- srclist catalog buffer filled. Found 33 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 65 source(s) in Genie image catalog. 2 source(s) are within 10.0" of the
xrt position. Found 5 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
19.98 mag. Found 1122 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 106% of the Genie image region.
This paragraph is only useful if the XRT position is grossly wrong. There are 3
candidate(s) in the image data with mag < 19.42 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=284.64790
(18:58:35.50), DEC=-8.25245 (-08:15:08.8) (J2000). It has a mag of 15.91. It is
68.8" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 543 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:58:35.50 = 284.64790
DEC(J2000) = -08:15:08.8 = -8.25245
with a 90%-confidence error radius of about 0.61 arc sec. The estimated
magnitude is 15.91 with a 1-sigma error of about 0.14. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.26.
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?
572173415 543 WHITE 284.64550 -8.23749 17.42/19.2 5.7 srclist Yes
572173415 543 WHITE 284.64544 -8.23745 16.34/20.0 5.5 image Yes
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -8.23745
GRB_ERROR: 0.61
GRB_RA: 284.64544
IMAGE_START_TIME: 09:03:30
MAGNITUDE: 16.34
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT