image overlap message for exposure 1 of trigger 1330958
uvot_overlap.pl vrs. 2010-12-20b fem started at 250707d16h06m29s358817usUT
The observation of trigger 1330958 started 2025-07-06T15:51:34.0
Examining file ./1330958_g182_uvot_sky_image.fits
The exposure ID is 773509893
The exposure time is 249.924 (seconds)
The filter is U.
The uvot region is centered at (284.0158,32.3272) with a roll angle of 357.6
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 (284.0070,32.2870) with a radius of 3.000 arc min
This is 2.451 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 4.80 sq. arc min or 0.17 of the BAT error circle
The XRT error circle is centered at (284.0176,32.3216) with a radius of 0.058 arc min
This is 0.349 arc min from the center of the uvot region
The area of the XRT error circle is 0.011 sq. arc min
The UVOT/XRT overlap is 0.011 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1330958
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250707d16h06m34s250561usUT
Observation start time is 2025-07-06T15:51:34.0
Examining file ./1330958_g182_uvot_catalog_image.fits
The exposure ID is 773509893
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 24 detected source(s) for 1330958_g182
Aspect correction adds 0.00060 degrees (0.143 sec of time = 1.82 arc sec) to RA
Aspect correction adds 0.00151 degrees ( 5.42 arcsec) to Dec
Total aspect correction is 5.72 arcsec
Star catalogs centered at 284.0151 , 32.3265 with radius 2.46 arc min.
n_usno: 225 n_gsc: 191
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.62186
RA DEC Mag Color
bright star 0: 284.01840 (18:56:04.42) 32.35499 (+32:21:18.0) 11.62 USNO-V
Mean distance difference (CAT_DELTA) for 26 matched entries is 0.554" for 1330958_g182
Mean and std. dev of mag. difference (MAG_DELTA) are 1.217 and 0.545 for 1330958_g182
Found 1 entries without IDs and 0 entries that are acceptable afterglow candidates for 1330958_g182.
Acceptable entries have no ID, XRT distances < 8.75", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
1 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=284.0070 (18:56:01.68) DEC=32.2870 (+32:17:13.2)
XRT distances are from RA=284.0176 (18:56:04.22) DEC=32.3216 (+32:19:17.6)
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 25:
ra=284.01694 dec= 32.34989 +/- 0.8" mag=19.58+/-0.21 dist=102.0 REFID=3 flag=0
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
284.0176 32.3234 6.7 -1 USNO-B1 17.88 16.48 17.10
284.0177 32.3204 4.1 -1 USNO-B1 18.35 16.62 17.39
284.0176 32.3233 6.3 -1 GSC2.3 16.46 17.72 16.87
284.0177 32.3203 4.5 -1 GSC2.3 16.50 18.07 17.11
The closest star is 4.14" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=284.01753 (18:56:04.21) dec=32.32352 (+32:19:24.7) +/- 0.7" mag=18.59+/-0.17 dist=7.0 REFID=15 flag=0
There are 13426.315 counts in the bkg source region of 5598.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.398 counts/pixel (5-sig UL in 4" is 19.99 mag) for 1330958_g182
There are 570.88214 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.869 counts/pixel for 1330958_g182
There are 2648.3706 counts in the xrt_bkg source region of 1191.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.224 counts/pixel (5-sig UL in 4" is 20.03 mag) for 1330958_g182
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 20.54, XRT distances < 8.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1330958_773509893_250707d16h06m34s250561usUT_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(284.0158,32.3272,45")
fk5;-circle(284.017532936323,32.3235164843308,6")
fk5;-circle(284.02110338974,32.315408300498,6")
fk5;-circle(284.023488034624,32.3297408497898,6")
fk5;-circle(284.031523650722,32.3226416825935,6")
fk5;-circle(284.031174757661,32.3250769663448,6")
fk5;-circle(284.01406111136,32.3313415432892,6")
fk5;-circle(284.004149494723,32.3225683907586,6")
fk5;-circle(284.018699963813,32.3365133170798,6")
fk5;-circle(284.002646273844,32.3323934217433,6")
Region file: 1330958_773509893_250707d16h06m34s250561usUT_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(284.01758,32.32156,8")
Region file: 1330958_773509893_250707d16h06m34s250561usUT_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(284.01758,32.32156,25")
fk5;-circle(284.01758,32.32156,15")
fk5;-circle(284.02110338974,32.315408300498,6")
image paragraph message for exposure 1 of trigger 1330958
SRCLIST PROBLEM: srclist filled telemetry buffer
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 GRB250706 (Swift/BAT trigger 1330958) at 15:48:30 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
147 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
0.092.
------- notes for trigger 1330958 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250707d16h06m39s386237usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1330958
-expid=773509893 -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/1330958/
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 773509893.9788 or about 2025:188:15:51:28 UT
Found 2715 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 26% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 43 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.12 mag.
Found 24 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 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.54 mag. Found 221 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 13426.3 counts in the large background region of 5598.0 pixels or a rate
of 2.398 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 19.79 mag. for a
4-arcsec aperture.
Found 570.9 counts in the XRT position region of 199.0 pixels or a rate of
2.869 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.514 +/- 0.102 (1-sigma) cps or
18.86 mag and a range from 18.66 to 19.10 mag. The 3-sigma UL at the XRT
position is 0.818 cps or 18.35 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.41 mag. The closest
srclist source has ra= 284.0211 dec= 32.3154 mag=17.46 sep=24.48".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 284.0175 dec= 32.3235 mag=18.59 sep=7.04". The closest Genie
source has ra= 284.0175 dec= 32.3235 mag=18.59 sep=7.04".
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 250 seconds with the U filter starting
147 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:56:04.21 = 284.01753
DEC(J2000) = +32:19:24.7 = 32.32352
with a 90%-confidence error radius of about 0.67 arc sec. This position is 7.04
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.59 with a 1-sigma error of about 0.17. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.092.
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?
773509893 146 U srclist found no candidates.
773509893 146 U image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 32.32156
GRB_ERROR: 8.75
GRB_RA: 284.01758
IMAGE_START_TIME: 15:51:28
MAGNITUDE: 18.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT