image overlap message for exposure 2 of trigger 1245636
uvot_overlap.pl vrs. 2010-12-20b fem started at 240730d10h52m12s520318usUT
The observation of trigger 1245636 started 2024-07-30T07:57:31.3
Examining file ./1245636_g324_uvot_sky_image.fits
The exposure ID is 744019051
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (37.8411,59.0771) with a roll angle of 78.4
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 (37.8290,59.0740) with a radius of 3.000 arc min
This is 0.418 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 (37.8382,59.0288) with a radius of 0.043 arc min
This is 2.902 arc min from the center of the uvot region
The area of the XRT error circle is 0.006 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 2 of trigger 1245636
find_uvot_ag.pl vrs. 2023-04-25a fem started at 240730d10h52m23s840121usUT
Observation start time is 2024-07-30T07:57:31.3
Examining file ./1245636_g324_uvot_catalog_image.fits
The exposure ID is 744019051
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 16 detected source(s) for 1245636_g324
Aspect correction adds 0.00461 degrees (1.107 sec of time = 8.53 arc sec) to RA
Aspect correction adds 0.00055 degrees ( 1.97 arcsec) to Dec
Total aspect correction is 8.75 arcsec
Star catalogs centered at 37.8321 , 59.0747 with radius 2.49 arc min.
n_usno: 200 n_gsc: 224
*** WARNING -- XRT position is outside star catalog search region.
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.71418
RA DEC Mag Color
bright star 0: 37.80075 (02:31:12.18) 59.07802 (+59:04:40.9) 11.71 USNO-V
Mean distance difference (CAT_DELTA) for 16 matched entries is 0.426" for 1245636_g324
Mean and std. dev of mag. difference (MAG_DELTA) are 1.415 and 0.611 for 1245636_g324
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1245636_g324.
Acceptable entries have no ID, XRT distances < 6.5", 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=37.8290 (02:31:18.96) DEC=59.0740 (+59:04:26.4)
XRT distances are from RA=37.8382 (02:31:21.17) DEC=59.0288 (+59:01:43.5)
-----------------
Entry 13 in the list of sources is a candidate afterglow for 1245636_g324 with genie
ra=37.79115 (02:31:09.88) dec=59.06685 (+59:04:00.7) +/- 0.7" mag=18.20+/-0.16
dist=162.5 REFID=13 major=1.2 minor=0.2 flag=16 (aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 74.6 arc sec from the BAT position.
This source is near the edge of image (0.976)
Found 3 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
37.7896 59.0669 2.9 -1 USNO-B1 14.91 13.95 14.38 *
37.7950 59.0643 11.7 -1 GSC2.3 19.51 99.99 99.99
37.7897 59.0668 2.7 -1 GSC2.3 13.15 14.66 13.60 *
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 21504.662 counts in the bkg source region of 5735.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.750 counts/pixel (5-sig UL in 4" is 19.75 mag) for 1245636_g324
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 20.30, XRT distances < 6.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1245636_744019051_240730d10h52m23s840121usUT_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(37.8411,59.0771,45")
fk5;-circle(37.8333460672971,59.0757801850312,6")
fk5;-circle(37.8295222908085,59.0711425244849,6")
fk5;-circle(37.83699816477,59.073863818625,6")
fk5;-circle(37.8320620429639,59.0786706560328,6")
fk5;-circle(37.835389008781,59.0662958198462,6")
fk5;-circle(37.8659491059443,59.0788425005974,6")
image paragraph message for exposure 2 of trigger 1245636
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no overlap
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB240730 (Swift/BAT trigger 1245636) at 07:52:06 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
291 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 none of the
XRT error circle. 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 large, but uncertain,
extinction expected.
------- notes for trigger 1245636 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 240730d10h52m26s733972usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1245636
-expid=744019051 -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/1245636/
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 744019051.2844 or about 2024:212:07:57:26 UT
Found 2633 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 23% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 67 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 16 source(s) in Genie image catalog. 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 20.30 mag. Found 224 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
25% of the Genie image region. The XRT position was OUTSIDE the star catalog
search region.
Genie image analysis:
Found 21504.7 counts in the large background region of 5735.0 pixels or a rate
of 3.750 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 19.55 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 18.75 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 37.8400 dec= 59.0302 mag=18.52 sep=6.31".
The closest srclist source has ra= 37.8400 dec= 59.0302 mag=18.52 sep=6.31".
The closest Genie source has ra= 37.8295 dec= 59.0566 mag=16.46 sep=101.69".
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
291 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 02:31:21.60 = 37.83999
DEC(J2000) = +59:01:48.9 = 59.03024
with a 90%-confidence error radius of about 1.10 arc sec. This position is 6.31
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.52 with a 1-sigma error of about 0.35. 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?
744019051 291 U srclist found no candidates.
744019051 291 U image found no candidates.
List afterglow candidates for other finding charts.
744018893 133 WHITE srclist found no candidates.
744018893 133 WHITE image found no candidates.
744019636 876 WHITE srclist found no candidates.
744019636 876 WHITE image found no candidates.
------- Tokens for Quick GCN -------