image overlap message for exposure 1 of trigger 1442421
uvot_overlap.pl vrs. 2010-12-20b fem started at 260120d14h55m49s853010usUT
The observation of trigger 1442421 started 2026-01-20T14:39:24.8
Examining file ./1442421_g993_uvot_sky_image.fits
The exposure ID is 790612764
The exposure time is 149.879 (seconds)
The filter is WHITE.
*** Warning -- found 23747 null pixels in the image.
The uvot region is centered at (210.3703,-64.1706) with a roll angle of 101.1
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 (210.3560,-64.1690) with a radius of 3.000 arc min
This is 0.385 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 (210.2806,-64.2201) with a radius of 0.088 arc min
This is 3.786 arc min from the center of the uvot region
The area of the XRT error circle is 0.025 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 1 of trigger 1442421
find_uvot_ag.pl vrs. 2023-04-25a fem started at 260120d14h55m54s773479usUT
Observation start time is 2026-01-20T14:39:24.8
Examining file ./1442421_g993_uvot_catalog_image.fits
The exposure ID is 790612764
The exposure is 149.879 sec.
The bin size is 2 pixels
The filter is WHITE
There are 1 detected source(s) for 1442421_g993
Aspect correction adds 0.00136 degrees (0.327 sec of time = 2.14 arc sec) to RA
Aspect correction adds -0.00098 degrees (-3.52 arcsec) to Dec
Total aspect correction is 4.12 arcsec
Star catalogs centered at 210.3598 , -64.1487 with radius 2.00 arc min.
n_usno: 348 n_gsc: 382
*** WARNING -- XRT position is outside star catalog search region.
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 0 matched entries is 0.000" for 1442421_g993
Mean and std. dev of mag. difference (MAG_DELTA) are 0.000 and -1.000 for 1442421_g993
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1442421_g993.
Acceptable entries have no ID, XRT distances < 13.25", 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=210.3560 (14:01:25.44) DEC=-64.1690 (-64:10:08.4)
XRT distances are from RA=210.2806 (14:01:07.35) DEC=-64.2201 (-64:13:12.5)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1442421_g993 with genie
ra=210.36461 (14:01:27.51) dec=-64.14094 (-64:08:27.4) +/- 0.8" mag=18.45+/-0.15
dist=314.1 REFID=1 major=0.8 minor=0.6 flag=16 (aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 101.9 arc sec from the BAT position.
This source is near the edge of image (0.937)
Found 14 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
210.3615 -64.1462 19.5 -1 USNO-B1 99.99 16.78 99.99
210.3649 -64.1435 9.3 -1 USNO-B1 99.99 17.62 99.99
210.3686 -64.1428 9.3 -1 USNO-B1 18.08 18.02 18.05
210.3616 -64.1398 6.2 -1 USNO-B1 99.99 13.60 99.99
210.3562 -64.1399 13.8 -1 USNO-B1 17.76 17.56 17.65
210.3726 -64.1411 12.5 -1 USNO-B1 18.43 19.27 18.90
210.3607 -64.1385 10.9 -1 USNO-B1 15.37 17.41 16.50
210.3660 -64.1445 13.1 -1 GSC2.3 17.17 99.99 17.55
210.3687 -64.1429 9.5 -1 GSC2.3 99.99 99.99 99.99
210.3536 -64.1417 17.4 -1 GSC2.3 17.18 99.99 99.99
210.3640 -64.1408 1.2 -1 GSC2.3 15.56 99.99 16.12 *
210.3531 -64.1401 18.3 -1 GSC2.3 99.99 99.99 99.99
210.3612 -64.1394 7.8 -1 GSC2.3 14.94 99.99 15.74
210.3725 -64.1410 12.3 -1 GSC2.3 99.99 99.99 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
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 0.0000000 counts in the bkg source region of 0.0000000 pixels.
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 19.42, XRT distances < 13.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1442421_790612764_260120d14h55m54s773479usUT_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(210.3703,-64.1706,45")
image paragraph message for exposure 1 of trigger 1442421
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: incomplete image, no overlap
SRCLIST PROBLEM: high density of stars, srclist filled telemetry buffer
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB260120 (Swift/BAT trigger 1442421) at 14:22:50 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 956 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. Because of the density of
catalogued stars, further analysis is required to report an upper limit for any
afterglow in the region. No correction has been made for extinction.
------- notes for trigger 1442421 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 260120d14h56m00s416603usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1442421
-expid=790612764 -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/1442421/
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.
*** Warning -- BAT and XRT error circles do NOT overlap.
UVOT exposure began at MET 790612764.83146 or about 0000:11708:14:39:28 UT
Found 3770 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 63% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 33 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 1 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 19.42 mag. Found 344 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 59% of the
Genie image region. The XRT position was OUTSIDE the star catalog search
region. The Genie image is INCOMPLETE with 23747 null pixels.
Found no Genie image background information. The number of srclist sources
filled the available telemetry. The weakest source detected was 18.62 mag. The
closest srclist source has ra= 210.2905 dec= -64.2229 mag=17.15 sep=18.31". The
closest Genie source has ra= 210.3646 dec= -64.1409 mag=18.45 sep=314.14".
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?
790612764 956 WHITE srclist found no candidates.
790612764 956 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------