image overlap message for exposure 1 of trigger 1037828
uvot_overlap.pl vrs. 2010-12-20b fem started at 210321d15h57m28s237543usUT
The observation of trigger 1037828 started 2021-03-21T07:59:52.9
Examining file ./1037828_g2760_uvot_sky_image.fits
The exposure ID is 638006392
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (87.8595,70.1167) with a roll angle of 267.2
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 (87.8740,70.1190) with a radius of 3.000 arc min
This is 0.325 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 (87.8958,70.1306) with a radius of 0.028 arc min
This is 1.113 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 1 of trigger 1037828
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210321d15h57m32s497035usUT
Observation start time is 2021-03-21T07:59:52.9
Examining file ./1037828_g2760_uvot_catalog_image.fits
The exposure ID is 638006392
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 7 detected source(s) for 1037828_g2760
Aspect correction adds 0.00008 degrees (0.019 sec of time = 0.10 arc sec) to RA
Aspect correction adds 0.00069 degrees ( 2.47 arcsec) to Dec
Total aspect correction is 2.48 arcsec
Star catalogs centered at 87.8546 , 70.1173 with radius 2.62 arc min.
n_usno: 79 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.140" for 1037828_g2760
Mean and std. dev of mag. difference (MAG_DELTA) are 1.047 and 0.501 for 1037828_g2760
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1037828_g2760.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=87.8740 (05:51:29.76) DEC=70.1190 (+70:07:08.4)
XRT distances are from RA=87.8958 (05:51:34.99) DEC=70.1306 (+70:07:50.1)
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1037828_g2760 with genie
ra=87.89478 (05:51:34.75) dec=70.13053 (+70:07:49.9) +/- 0.6" mag=18.51+/-0.15
dist=1.2 REFID=2 major=1.1 minor=1.0 flag=0
Found 0 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)
uvot_check_outside found 11 of 11 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=87.89478 (05:51:34.75) dec=70.13053 (+70:07:49.9) +/- 0.6" mag=18.51+/-0.15 dist=1.2 REFID=2 flag=0
There are 1.9139381E+05 counts in the bkg source region of 6142.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 31.161 counts/pixel (5-sig UL in 4" is 19.48 mag) for 1037828_g2760
There are 1970.9000 counts in the src source region of 48.000000 pixels.
Rate in src region with 4 arcsec radius is 41.060 counts/pixel for 1037828_g2760
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 20.04, 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: 1037828_638006392_210321d15h57m32s497035usUT_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(87.8595,70.1167,45")
fk5;-circle(87.8390671388838,70.112213209247,6")
fk5;-circle(87.8230635758215,70.1154698496045,6")
Region file: 1037828_638006392_210321d15h57m32s497035usUT_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(87.8947848058246,70.1305272225998,4")
image paragraph message for exposure 1 of trigger 1037828
------ Start for Possible Stand-alone Circular ----
In response to GRB210321 (Swift/BAT trigger 1037828) at 07:13:51 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 2735 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 05:51:34.75 = 87.89478
DEC(J2000) = +70:07:49.9 = 70.13053
with a 90%-confidence error radius of about 0.64 arc sec. This position is 1.2
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.51 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.118.
------- notes for trigger 1037828 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210321d15h57m35s649260usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1037828
-expid=638006392 -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/1037828/
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 638006392.88806 or about 2021:080:07:59:47 UT
Found 412 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 55 sources in
srclist catalog. Found 3 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 7 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.04 mag. Found 75 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 7% 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?
638006392 2734 WHITE 87.89410 70.13062 19.09/19.2 2.1 srclist Yes
638006392 2734 WHITE 87.89478 70.13053 18.51/20.0 1.2 image Yes
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 70.13053
GRB_ERROR: 0.64
GRB_RA: 87.89478
IMAGE_START_TIME: 07:59:47
MAGNITUDE: 18.51
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT