image overlap message for exposure 1 of trigger 1299776
uvot_overlap.pl vrs. 2010-12-20b fem started at 250330d17h01m22s820279usUT
The observation of trigger 1299776 started 2025-03-30T07:13:57.6
Examining file ./1299776_g3978_uvot_sky_image.fits
The exposure ID is 765011637
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (252.9297,-86.8728) with a roll angle of 115.7
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 (252.7900,-86.8700) with a radius of 3.000 arc min
This is 0.488 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 (252.9448,-86.8805) with a radius of 0.038 arc min
This is 0.465 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 1 of trigger 1299776
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250330d17h01m25s616184usUT
Observation start time is 2025-03-30T07:13:57.6
Examining file ./1299776_g3978_uvot_catalog_image.fits
The exposure ID is 765011637
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 16 detected source(s) for 1299776_g3978
Aspect correction adds 0.01468 degrees (3.522 sec of time = 2.87 arc sec) to RA
Aspect correction adds -0.00111 degrees (-3.99 arcsec) to Dec
Total aspect correction is 4.91 arcsec
Star catalogs centered at 252.7619 , -86.8715 with radius 2.96 arc min.
n_usno: 211 n_gsc: 146
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 16 matched entries is 0.404" for 1299776_g3978
Mean and std. dev of mag. difference (MAG_DELTA) are 1.220 and 0.556 for 1299776_g3978
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1299776_g3978.
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=252.7900 (16:51:09.60) DEC=-86.8700 (-86:52:12.0)
XRT distances are from RA=252.9448 (16:51:46.76) DEC=-86.8805 (-86:52:49.9)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1299776_g3978 with genie
ra=252.74385 (16:50:58.52) dec=-86.89520 (-86:53:42.7) +/- 0.7" mag=19.50+/-0.16
dist=65.8 REFID=3 major=1.6 minor=1.4 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 91.2 arc sec from the BAT position.
This source is near the edge of image (0.984)
Found 12 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
252.8255 -86.8949 16.0 -1 USNO-B1 99.99 17.61 99.99
252.7439 -86.8953 0.5 -1 USNO-B1 21.12 20.47 20.76 *
252.7350 -86.8954 1.8 -1 USNO-B1 21.14 19.24 20.08 *
252.7364 -86.8956 2.0 -1 USNO-B1 19.54 19.63 19.59 *
252.8122 -86.8958 13.5 -1 USNO-B1 14.85 13.65 14.18
252.6677 -86.8985 19.1 -1 USNO-B1 21.35 19.64 20.40
252.6695 -86.8990 19.8 -1 USNO-B1 20.82 19.81 20.26
252.7297 -86.8996 16.2 -1 USNO-B1 17.77 16.54 17.08
252.7363 -86.8956 1.9 -1 GSC2.3 19.16 19.66 99.99 *
252.8117 -86.8958 13.4 -1 GSC2.3 13.77 14.83 99.99
252.6653 -86.8986 19.6 -1 GSC2.3 19.82 22.29 99.99
252.7281 -86.8997 16.4 -1 GSC2.3 16.95 17.82 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1299776_g3978 with genie
ra=252.94545 (16:51:46.91) dec=-86.88829 (-86:53:17.9) +/- 0.9" mag=20.86+/-0.24
dist=27.9 REFID=14 major=2.4 minor=2.2 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 72.6 arc sec from the BAT position.
Found 5 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
252.9387 -86.8878 2.1 -1 USNO-B1 20.78 20.05 20.37 *
253.0179 -86.8913 17.8 -1 USNO-B1 14.56 13.06 13.73
252.9978 -86.8930 19.7 -1 USNO-B1 21.25 20.31 20.73
252.9342 -86.8877 3.1 -1 GSC2.3 19.93 22.22 99.99 *
253.0171 -86.8913 17.7 -1 GSC2.3 13.08 14.53 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" 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 39113.770 counts in the bkg source region of 5960.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 6.563 counts/pixel (5-sig UL in 4" is 20.33 mag) for 1299776_g3978
There are 1242.6533 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 6.213 counts/pixel for 1299776_g3978
There are 7665.4771 counts in the xrt_bkg source region of 1159.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 6.614 counts/pixel (5-sig UL in 4" is 20.32 mag) for 1299776_g3978
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 20.88, 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: 1299776_765011637_250330d17h01m25s616184usUT_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(252.9297,-86.8728,45")
fk5;-circle(252.749034477184,-86.8745171468305,6")
fk5;-circle(253.019838631,-86.8791887701551,6")
fk5;-circle(253.126684931494,-86.875588117233,6")
fk5;-circle(252.933889019654,-86.8595324818453,6")
Region file: 1299776_765011637_250330d17h01m25s616184usUT_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(252.94483,-86.88053,8")
Region file: 1299776_765011637_250330d17h01m25s616184usUT_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(252.94483,-86.88053,25")
fk5;-circle(252.94483,-86.88053,15")
fk5;-circle(252.945453325385,-86.8882930113329,6")
fk5;-circle(253.019838631,-86.8791887701551,6")
image paragraph message for exposure 1 of trigger 1299776
------ Start for Possible Stand-alone Circular ----
In response to GRB250330 (Swift/BAT trigger 1299776) at 06:07:38 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 3944 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 0.147.
------- notes for trigger 1299776 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250330d17h01m30s101003usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1299776
-expid=765011637 -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/1299776/
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 765011637.6376 or about 2025:090:07:13:52 UT
Found 852 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 16% of the srclist region. Found 96 sources in
srclist catalog. Found 2 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 16 source(s) in Genie image catalog. Found 2 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.88 mag. Found 207 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
16% of the Genie image region.
Genie image analysis:
Found 39113.8 counts in the large background region of 5960.0 pixels or a rate
of 6.563 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 20.15 mag. for a
4-arcsec aperture.
Found 1242.7 counts in the XRT position region of 200.0 pixels or a rate of
6.213 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.534 +/- 0.256 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.767 cps or 19.89 mag. The closest srclist
source has ra= 253.0209 dec= -86.8792 mag=18.81 sep=15.65". The closest Genie
source has ra= 253.0198 dec= -86.8792 mag=18.49 sep=15.47".
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?
765011637 3943 WHITE srclist found no candidates.
765011637 3943 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -86.88053
GRB_ERROR: 5.75
GRB_RA: 252.94483
IMAGE_START_TIME: 07:13:52
MAGNITUDE: 19.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT