image overlap message for exposure 3 of trigger 1277277
uvot_overlap.pl vrs. 2010-12-20b fem started at 241228d08h15m47s891981usUT
The observation of trigger 1277277 started 2024-12-27T04:12:17.8
Examining file ./1277277_g901_uvot_sky_image.fits
The exposure ID is 757051937
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (344.8182,18.5996) with a roll angle of 240.1
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 (344.8240,18.6040) with a radius of 3.000 arc min
This is 0.423 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 (344.8019,18.6106) with a radius of 0.038 arc min
This is 1.142 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 3 of trigger 1277277
find_uvot_ag.pl vrs. 2023-04-25a fem started at 241228d08h16m13s871986usUT
Observation start time is 2024-12-27T04:12:17.8
Examining file ./1277277_g901_uvot_catalog_image.fits
The exposure ID is 757051937
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 11 detected source(s) for 1277277_g901
Aspect correction adds -0.00043 degrees (-0.104 sec of time = -1.47 arc sec) to RA
Aspect correction adds -0.00057 degrees (-2.06 arcsec) to Dec
Total aspect correction is 2.53 arcsec
Star catalogs centered at 344.8232 , 18.5998 with radius 2.44 arc min.
n_usno: 62 n_gsc: 56
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 11 matched entries is 0.560" for 1277277_g901
Mean and std. dev of mag. difference (MAG_DELTA) are 0.870 and 0.682 for 1277277_g901
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1277277_g901.
Acceptable entries have no ID, XRT distances < 5.75", 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=344.8240 (22:59:17.76) DEC=18.6040 (+18:36:14.4)
XRT distances are from RA=344.8019 (22:59:12.45) DEC=18.6106 (+18:36:38.3)
-----------------
Entry 10 in the list of sources is a candidate afterglow for 1277277_g901 with genie
ra=344.82602 (22:59:18.24) dec=18.57838 (+18:34:42.2) +/- 0.8" mag=20.50+/-0.23
dist=142.4 REFID=2 major=1.0 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 92.5 arc sec from the BAT position.
This source is near the edge of image (0.927)
Found 4 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
344.8262 18.5778 2.1 -1 USNO-B1 19.74 18.05 18.80 *
344.8262 18.5773 3.9 -1 USNO-B1 20.44 19.33 19.82 *
344.8257 18.5811 9.8 -1 GSC2.3 18.95 99.99 99.99
344.8262 18.5779 1.9 -1 GSC2.3 17.98 19.73 18.41 *
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 67640.625 counts in the bkg source region of 6197.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 10.915 counts/pixel (5-sig UL in 4" is 20.05 mag) for 1277277_g901
There are 2141.2085 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 10.814 counts/pixel for 1277277_g901
XRT source is too far (68.4121981003009") 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 20.61, XRT distances < 5.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1277277_757051937_241228d08h16m13s871986usUT_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(344.8182,18.5996,45")
fk5;-circle(344.832227257372,18.5957748753153,6")
fk5;-circle(344.812300313953,18.6119488307442,6")
fk5;-circle(344.806604061833,18.5978353376392,6")
Region file: 1277277_757051937_241228d08h16m13s871986usUT_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(344.80188,18.61064,8")
image paragraph message for exposure 3 of trigger 1277277
------ Start for Possible Stand-alone Circular ----
In response to GRB241228 (Swift/BAT trigger 1277277) at 03:57:15 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 867 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 expected extinction corresponding to E(B-V) of
0.092.
------- notes for trigger 1277277 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 241228d08h16m19s577979usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1277277
-expid=757051937 -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/1277277/
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 757051937.80796 or about 2024:363:04:12:12 UT
Found 904 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 89 sources in
srclist catalog. Found 1 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 11 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 20.61 mag. Found 58 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
6% of the Genie image region.
Genie image analysis:
Found 67640.6 counts in the large background region of 6197.0 pixels or a rate
of 10.915 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 19.88 mag. for a
4-arcsec aperture.
Found 2141.2 counts in the XRT position region of 198.0 pixels or a rate of
10.814 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.133 +/- 0.313 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.940 cps or 19.67 mag. The closest srclist
source has ra= 344.8039 dec= 18.6281 mag=19.25 sep=63.21". The closest Genie
source has ra= 344.8123 dec= 18.6120 mag=20.38 sep=35.86".
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?
757051937 867 WHITE srclist found no candidates.
757051937 867 WHITE image found no candidates.
List afterglow candidates for other finding charts.
757051170 100 WHITE srclist found no candidates.
757051170 100 WHITE image found no candidates.
757051384 314 U srclist found no candidates.
757051384 314 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 18.61064
GRB_ERROR: 5.75
GRB_RA: 344.80188
IMAGE_START_TIME: 04:12:12
MAGNITUDE: 19.7
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT