image overlap message for exposure 3 of trigger 874334
uvot_overlap.pl vrs. 2010-12-20b fem started at 181202d09h16m47s678444usUT
The observation of trigger 874334 started 2018-12-02T06:51:15.7
Examining file ./874334_g890_uvot_sky_image.fits
The exposure ID is 565426275
The exposure time is 149.857 (seconds)
The filter is U.
The uvot region is centered at (280.7437,27.9477) 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 0.207 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 0.854 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 3 of trigger 874334
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181202d09h17m24s361752usUT
Observation start time is 2018-12-02T06:51:15.7
Examining file ./874334_g890_uvot_catalog_image.fits
The exposure ID is 565426275
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is U
There are 20 detected source(s) for 874334_g890
Aspect correction adds -0.00054 degrees (-0.129 sec of time = -1.71 arc sec) to RA
Aspect correction adds 0.00032 degrees ( 1.16 arcsec) to Dec
Total aspect correction is 2.07 arcsec
Star catalogs centered at 280.7433 , 27.9456 with radius 2.83 arc min.
n_usno: 293 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 17 matched entries is 0.503" for 874334_g890
Mean and std. dev of mag. difference (MAG_DELTA) are 1.462 and 0.671 for 874334_g890
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 874334_g890.
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 4 in the list of sources is a candidate afterglow for 874334_g890 with genie
ra=280.74158 (18:42:57.98) dec=27.94588 (+27:56:45.2) +/- 0.7" mag=17.79+/-0.16
dist=53.9 REFID=16 major=0.8 minor=0.7 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 21.4 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 2.0 -1 USNO-B1 15.65 14.21 14.85 *
280.7418 27.9482 8.3 -1 USNO-B1 17.87 16.66 17.20
280.7405 27.9496 13.9 -1 USNO-B1 17.00 16.05 16.47
280.7381 27.9418 18.5 -1 USNO-B1 20.52 19.55 19.98
280.7369 27.9480 16.6 -1 USNO-B1 20.36 19.66 19.97
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 5 in the list of sources is a candidate afterglow for 874334_g890 with genie
ra=280.74291 (18:42:58.30) dec=27.94490 (+27:56:41.6) +/- 0.7" mag=18.03+/-0.17
dist=58.8 REFID=17 major=1.0 minor=0.8 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 23.0 arc sec from the BAT position.
Found 5 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
280.7421 27.9455 3.5 -1 USNO-B1 15.65 14.21 14.85 *
280.7418 27.9482 12.2 -1 USNO-B1 17.87 16.66 17.20
280.7405 27.9496 18.6 -1 USNO-B1 17.00 16.05 16.47
280.7484 27.9474 19.7 -1 USNO-B1 20.56 19.58 20.02
280.7381 27.9418 19.1 -1 USNO-B1 20.52 19.55 19.98
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 14 in the list of sources is a candidate afterglow for 874334_g890 with genie
ra=280.76517 (18:43:03.64) dec=27.95750 (+27:57:27.0) +/- 0.8" mag=18.89+/-0.21
dist=96.5 REFID=6 major=1.0 minor=0.6 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 68.3 arc sec from the BAT position.
This source is near the edge of image (0.988)
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
280.7627 27.9599 11.7 -1 USNO-B1 20.29 18.76 19.44
280.7650 27.9588 4.9 -1 USNO-B1 20.05 19.29 19.63 *
280.7660 27.9582 3.5 -1 USNO-B1 16.02 14.72 15.30 *
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:
There are 16263.273 counts in the bkg source region of 5404.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.009 counts/pixel (5-sig UL in 4" is 19.31 mag) for 874334_g890
There are 581.80267 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.924 counts/pixel for 874334_g890
There are 3431.6062 counts in the xrt_bkg source region of 1201.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.857 counts/pixel (5-sig UL in 4" is 19.34 mag) for 874334_g890
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 19.87, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 874334_565426275_181202d09h17m24s361752usUT_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(280.7437,27.9477,45")
fk5;-circle(280.74210089169,27.9479476718413,6")
fk5;-circle(280.740496974215,27.9496542003334,6")
fk5;-circle(280.750406931095,27.9500851764397,6")
fk5;-circle(280.74611784422,27.9558091314912,6")
fk5;-circle(280.741582816553,27.9458781214706,6")
fk5;-circle(280.742911574004,27.9448969508858,6")
fk5;-circle(280.737779307798,27.9518350598824,6")
fk5;-circle(280.749525067768,27.9561949958895,6")
fk5;-circle(280.732165389586,27.9527939114787,6")
fk5;-circle(280.749998412424,27.9355576171113,6")
Region file: 874334_565426275_181202d09h17m24s361752usUT_xrt.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(280.73492,27.95964,8")
Region file: 874334_565426275_181202d09h17m24s361752usUT_xrt_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(280.73492,27.95964,25")
fk5;-circle(280.73492,27.95964,15")
fk5;-circle(280.737779307798,27.9518350598824,6")
fk5;-circle(280.732165389586,27.9527939114787,6")
image paragraph message for exposure 3 of trigger 874334
SRCLIST PROBLEM: srclist filled telemetry buffer
------ 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 150 seconds with the U filter starting
869 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 100% of the
XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. 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
0.14.
------- notes for trigger 874334 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181202d09h17m30s435325usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=874334
-expid=565426275 -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 565426275.72712 or about 2018:336:06:51:10 UT
Found 3089 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 13 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 17.84 mag.
Found 20 source(s) in Genie image catalog. Found 3 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.87 mag. Found 289 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
25% of the Genie image region.
Genie image analysis:
Found 16263.3 counts in the large background region of 5404.0 pixels or a rate
of 3.009 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 19.35 mag. for a
4-arcsec aperture.
Found 581.8 counts in the XRT position region of 199.0 pixels or a rate of
2.924 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.088 +/- 0.173 (1-sigma) cps or
21.02 mag and a range from 19.84 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.608 cps or 18.92 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.65 mag. The closest
srclist source has ra= 280.7321 dec= 27.9527 mag=17.36 sep=26.67". The closest
Genie source has ra= 280.7322 dec= 27.9528 mag=16.53 sep=26.16".
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?
565426275 868 U srclist found no candidates.
565426275 868 U image found no candidates.
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
565425748 341 B srclist found no candidates.
565425748 341 B 280.73483 27.95982 19.88/20.4 0.7 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 27.95964
GRB_ERROR: 5
GRB_RA: 280.73492
IMAGE_START_TIME: 06:51:10
MAGNITUDE: 18.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT