image overlap message for exposure 2 of trigger 1299967
uvot_overlap.pl vrs. 2010-12-20b fem started at 250331d16h42m22s908899usUT
The observation of trigger 1299967 started 2025-03-31T04:52:51.0
Examining file ./1299967_g909_uvot_sky_image.fits
The exposure ID is 765089570
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (80.9501,33.0618) with a roll angle of 263.1
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 (80.9930,33.0290) with a radius of 3.000 arc min
This is 2.923 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 3.46 sq. arc min or 0.12 of the BAT error circle
The XRT error circle is centered at (80.9562,33.0635) with a radius of 0.037 arc min
This is 0.324 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1299967
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250331d16h42m44s416407usUT
Observation start time is 2025-03-31T04:52:51.0
Examining file ./1299967_g909_uvot_catalog_image.fits
The exposure ID is 765089570
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 21 detected source(s) for 1299967_g909
Aspect correction adds -0.00186 degrees (-0.446 sec of time = -5.61 arc sec) to RA
Aspect correction adds 0.00017 degrees ( 0.62 arcsec) to Dec
Total aspect correction is 5.64 arcsec
Star catalogs centered at 80.9560 , 33.0636 with radius 2.56 arc min.
n_usno: 246 n_gsc: 240
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.10448
RA DEC Mag Color
bright star 0: 80.97893 (05:23:54.94) 33.08483 (+33:05:05.4) 11.10 USNO-V
bright star 1: 80.91955 (05:23:40.69) 33.04069 (+33:02:26.5) 11.92 GSC-V
Mean distance difference (CAT_DELTA) for 22 matched entries is 0.407" for 1299967_g909
Mean and std. dev of mag. difference (MAG_DELTA) are 0.659 and 0.313 for 1299967_g909
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1299967_g909.
Acceptable entries have no ID, XRT distances < 5.5", 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=80.9930 (05:23:58.32) DEC=33.0290 (+33:01:44.4)
XRT distances are from RA=80.9562 (05:23:49.49) DEC=33.0635 (+33:03:48.5)
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
80.9566 33.0655 7.4 -1 USNO-B1 20.43 19.25 19.77
80.9580 33.0618 8.2 -1 USNO-B1 15.79 14.65 15.15
80.9570 33.0652 6.6 -1 GSC2.3 19.41 21.32 99.99
80.9581 33.0617 8.5 -1 GSC2.3 14.54 15.55 15.11
The closest star is 6.57" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=80.95790 (05:23:49.90) dec=33.06177 (+33:03:42.4) +/- 0.6" mag=16.01+/-0.14 dist=8.0 REFID=14 flag=0
There are 1.2443821E+05 counts in the bkg source region of 5625.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 22.122 counts/pixel (5-sig UL in 4" is 19.67 mag) for 1299967_g909
There are 6131.4604 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 30.967 counts/pixel for 1299967_g909
There are 25259.029 counts in the xrt_bkg source region of 1110.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 22.756 counts/pixel (5-sig UL in 4" is 19.65 mag) for 1299967_g909
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 20.22, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1299967_765089570_250331d16h42m44s416407usUT_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(80.9501,33.0618,45")
fk5;-circle(80.9578982044254,33.0617708252617,6")
fk5;-circle(80.9499249283473,33.0608770117687,6")
fk5;-circle(80.9476802788016,33.0647087187509,6")
fk5;-circle(80.9467001897718,33.0604816087491,6")
fk5;-circle(80.950415319606,33.0547051325146,6")
fk5;-circle(80.9450236463101,33.069346103744,6")
fk5;-circle(80.9522905040344,33.0756119735631,6")
fk5;-circle(80.9475678888955,33.0748359918872,6")
fk5;-circle(80.935908073603,33.0542682582344,6")
Region file: 1299967_765089570_250331d16h42m44s416407usUT_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(80.95621,33.06347,8")
Region file: 1299967_765089570_250331d16h42m44s416407usUT_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(80.95621,33.06347,25")
fk5;-circle(80.95621,33.06347,15")
fk5;-circle(80.9499249283473,33.0608770117687,6")
fk5;-circle(80.9476802788016,33.0647087187509,6")
fk5;-circle(80.9467001897718,33.0604816087491,6")
image paragraph message for exposure 2 of trigger 1299967
SRCLIST PROBLEM: srclist filled telemetry buffer
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB250331 (Swift/BAT trigger 1299967) at 04:37:40 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 874 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 19.6 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 mag. No
correction has been made for the large, but uncertain, extinction expected.
------- notes for trigger 1299967 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250331d16h42m48s090807usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1299967
-expid=765089570 -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/1299967/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for xrt position. XRT position found for srclist.
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 765089570.98798 or about 2025:091:04:52:45 UT
Found 2611 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 24% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 4 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 19.22 mag.
Found 21 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. 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
20.22 mag. Found 242 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 124438.2 counts in the large background region of 5625.0 pixels or a rate
of 22.122 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 19.49 mag. for a
4-arcsec aperture.
Found 6131.5 counts in the XRT position region of 198.0 pixels or a rate of
30.967 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 10.839 +/- 0.555 (1-sigma) cps or
17.02 mag and a range from 16.96 to 17.07 mag. The 3-sigma UL at the XRT
position is 12.504 cps or 16.86 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.51 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 80.9581 dec= 33.0618 mag=16.52 sep=8.21".
The closest srclist source has ra= 80.9581 dec= 33.0618 mag=16.52 sep=8.21".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 80.9579 dec= 33.0618 mag=16.01 sep=7.96". The closest Genie
source has ra= 80.9579 dec= 33.0618 mag=16.01 sep=7.96".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 874 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 05:23:49.90 = 80.95790
DEC(J2000) = +33:03:42.4 = 33.06177
with a 90%-confidence error radius of about 0.61 arc sec. This position is 7.96
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.01 with a 1-sigma error of about 0.14. No correction has been made for the
large, but uncertain, extinction expected.
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?
765089570 874 WHITE srclist found no candidates.
765089570 874 WHITE image found no candidates.
List afterglow candidates for other finding charts.
765088835 139 WHITE srclist found no candidates.
765088835 139 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 33.06347
GRB_ERROR: 5.5
GRB_RA: 80.95621
IMAGE_START_TIME: 04:52:45
MAGNITUDE: 16.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT