image overlap message for exposure 2 of trigger 1285677
uvot_overlap.pl vrs. 2010-12-20b fem started at 250129d06h20m43s189569usUT
The observation of trigger 1285677 started 2025-01-28T16:28:23.4
Examining file ./1285677_g329_uvot_sky_image.fits
The exposure ID is 759774503
The exposure time is 249.924 (seconds)
The filter is U.
The uvot region is centered at (231.4262,-0.5183) with a roll angle of 108.2
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 (231.4200,-0.5170) with a radius of 3.000 arc min
This is 0.383 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 (231.4254,-0.5393) with a radius of 0.045 arc min
This is 1.257 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 0.006 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1285677
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250129d06h21m02s058109usUT
Observation start time is 2025-01-28T16:28:23.4
Examining file ./1285677_g329_uvot_catalog_image.fits
The exposure ID is 759774503
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 2 detected source(s) for 1285677_g329
Aspect correction adds 0.00031 degrees (0.076 sec of time = 1.13 arc sec) to RA
Aspect correction adds -0.00101 degrees (-3.63 arcsec) to Dec
Total aspect correction is 3.80 arcsec
Star catalogs centered at 231.4280 , -0.5130 with radius 2.37 arc min.
n_usno: 46 n_gsc: 43
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 2 matched entries is 0.307" for 1285677_g329
Mean and std. dev of mag. difference (MAG_DELTA) are 0.743 and 0.042 for 1285677_g329
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1285677_g329.
Acceptable entries have no ID, XRT distances < 6.75", 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=231.4200 (15:25:40.80) DEC=-0.5170 (-00:31:01.2)
XRT distances are from RA=231.4254 (15:25:42.10) DEC=-0.5393 (-00:32:21.4)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 23921.229 counts in the bkg source region of 6317.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.787 counts/pixel (5-sig UL in 4" is 19.74 mag) for 1285677_g329
There are 751.57428 counts in the xrt source region of 204.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.684 counts/pixel for 1285677_g329
XRT source is too far (75.5801759907463") 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 20.30, XRT distances < 6.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1285677_759774503_250129d06h21m02s058109usUT_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(231.4262,-0.5183,45")
Region file: 1285677_759774503_250129d06h21m02s058109usUT_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(231.42542,-0.53928,8")
image paragraph message for exposure 2 of trigger 1285677
------ Start for Possible Stand-alone Circular ----
In response to GRB250128 (Swift/BAT trigger 1285677) at 16:22:53 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
294 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
0.121.
------- notes for trigger 1285677 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250129d06h21m09s411718usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1285677
-expid=759774503 -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/1285677/
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 759774503.3667 or about 2025:029:16:28:18 UT
Found 549 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 55 sources in
srclist catalog. Found 10 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 2 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 20.30 mag. Found 43 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 5% of the
Genie image region.
Genie image analysis:
Found 23921.2 counts in the large background region of 6317.0 pixels or a rate
of 3.787 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 19.54 mag. for a
4-arcsec aperture.
Found 751.6 counts in the XRT position region of 204.0 pixels or a rate of
3.684 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.084 +/- 0.111 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.334 cps or 19.33 mag. The closest srclist
source has ra= 231.4176 dec= -0.5572 mag=18.87 sep=70.54". The closest Genie
source has ra= 231.4505 dec= -0.5169 mag=16.62 sep=120.89".
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?
759774503 294 U srclist found no candidates.
759774503 294 U image found no candidates.
List afterglow candidates for other finding charts.
759774291 82 WHITE srclist found no candidates.
759774291 82 WHITE image found no candidates.
759775081 872 ? srclist data are not available.
759775081 872 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -0.53928
GRB_ERROR: 6.75
GRB_RA: 231.42542
IMAGE_START_TIME: 16:28:18
MAGNITUDE: 19.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT