image overlap message for exposure 1 of trigger 1042398
uvot_overlap.pl vrs. 2010-12-20b fem started at 210411d21h11m06s762462usUT
The observation of trigger 1042398 started 2021-04-11T15:07:24.7
Examining file ./1042398_g92_uvot_sky_image.fits
The exposure ID is 639846444
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (296.5625,-39.3713) with a roll angle of 79.4
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 (296.5590,-39.3730) with a radius of 3.000 arc min
This is 0.191 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 (296.6112,-39.3979) with a radius of 0.033 arc min
This is 2.769 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 0.000 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1042398
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210411d21h11m11s061047usUT
Observation start time is 2021-04-11T15:07:24.7
Examining file ./1042398_g92_uvot_catalog_image.fits
The exposure ID is 639846444
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 20 detected source(s) for 1042398_g92
Aspect correction adds 0.00238 degrees (0.571 sec of time = 6.62 arc sec) to RA
Aspect correction adds 0.00056 degrees ( 2.03 arcsec) to Dec
Total aspect correction is 6.93 arcsec
Star catalogs centered at 296.5645 , -39.3711 with radius 2.62 arc min.
n_usno: 183 n_gsc: 0
*** WARNING -- XRT position is outside star catalog search region.
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.81126
RA DEC Mag Color
bright star 0: 296.61001 (19:46:26.40) -39.38318 (-39:22:59.5) 11.81 USNO-V
Mean distance difference (CAT_DELTA) for 21 matched entries is 0.637" for 1042398_g92
Mean and std. dev of mag. difference (MAG_DELTA) are 0.891 and 0.545 for 1042398_g92
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1042398_g92.
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=296.5590 (19:46:14.16) DEC=-39.3730 (-39:22:22.8)
XRT distances are from RA=296.6112 (19:46:26.69) DEC=-39.3979 (-39:23:52.6)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 61185.461 counts in the bkg source region of 5531.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 11.062 counts/pixel (5-sig UL in 4" is 20.04 mag) for 1042398_g92
Do not compute counts in XRT region because position is too far from center.
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 20.60, 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: 1042398_639846444_210411d21h11m11s061047usUT_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(296.5625,-39.3713,45")
fk5;-circle(296.56491591009,-39.3733811967558,6")
fk5;-circle(296.558005944625,-39.3783634306919,6")
fk5;-circle(296.551849124451,-39.3748233952547,6")
fk5;-circle(296.567728769857,-39.3718585287084,6")
fk5;-circle(296.556767545372,-39.3655972376063,6")
fk5;-circle(296.563217254259,-39.3826523441583,6")
fk5;-circle(296.568946363587,-39.3628642839257,6")
fk5;-circle(296.5670508883,-39.384427447228,6")
fk5;-circle(296.572491060017,-39.3595899876461,6")
image paragraph message for exposure 1 of trigger 1042398
------ Start for Possible Stand-alone Circular ----
In response to GRB210411 (Swift/BAT trigger 1042398) at 15:05:51 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 66 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 19:46:26.83 = 296.61178
DEC(J2000) = -39:23:51.9 = -39.39774
with a 90%-confidence error radius of about 1.10 arc sec. This position is 1.7
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.99. No correction has been made for the expected extinction corresponding to
E(B-V) of 0.081.
------- notes for trigger 1042398 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210411d21h11m13s991806usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1042398
-expid=639846444 -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/1042398/
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 639846444.65888 or about 2021:101:15:07:19 UT
Found 847 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 16% of the srclist region. Found 108 sources in
srclist catalog. Found 25 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 20 source(s) in Genie image catalog. Found 0 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.60 mag. Found 179 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
18% of the Genie image region. The XRT position was OUTSIDE the star catalog
search region. The closest Genie source has ra= 296.5846 dec= -39.3843
mag=19.01 sep=88.74".
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?
639846444 65 WHITE 296.61178 -39.39774 17.99/19.2 1.7 srclist Yes
639846444 65 WHITE image found no candidates.
List afterglow candidates for other finding charts.
639846656 277 U 296.61208 -39.39766 18.21/18.1 2.4 srclist Yes
639846656 277 U image found no candidates.
639847235 856 WHITE 296.61160 -39.39793 18.58/19.2 3.0 srclist Yes
639847235 856 ? image data are not available.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -39.39774
GRB_ERROR: 1.10
GRB_RA: 296.61178
IMAGE_START_TIME: 15:07:19
MAGNITUDE: 17.99
MAG_ERROR: 0.4
MESSAGE_TYPE: ACK
SOURCE: XRT