image overlap message for exposure 1 of trigger 1442454
uvot_overlap.pl vrs. 2010-12-20b fem started at 260121d01h29m11s505646usUT
The observation of trigger 1442454 started 2026-01-20T18:03:32.4
Examining file ./1442454_g185_uvot_sky_image.fits
The exposure ID is 790625012
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (284.6744,61.9055) with a roll angle of 162.8
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 (284.6660,61.9120) with a radius of 3.000 arc min
This is 0.457 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 (284.6597,61.9050) with a radius of 0.038 arc min
This is 0.415 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 1442454
find_uvot_ag.pl vrs. 2023-04-25a fem started at 260121d01h29m13s753616usUT
Observation start time is 2026-01-20T18:03:32.4
Examining file ./1442454_g185_uvot_catalog_image.fits
The exposure ID is 790625012
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 9 detected source(s) for 1442454_g185
Aspect correction adds 0.00003 degrees (0.007 sec of time = 0.05 arc sec) to RA
Aspect correction adds -0.00071 degrees (-2.54 arcsec) to Dec
Total aspect correction is 2.55 arcsec
Star catalogs centered at 284.6751 , 61.9062 with radius 2.63 arc min.
n_usno: 73 n_gsc: 74
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 8 matched entries is 0.385" for 1442454_g185
Mean and std. dev of mag. difference (MAG_DELTA) are 1.011 and 0.407 for 1442454_g185
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1442454_g185.
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=284.6660 (18:58:39.84) DEC=61.9120 (+61:54:43.2)
XRT distances are from RA=284.6597 (18:58:38.34) DEC=61.9050 (+61:54:17.9)
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1442454_g185 with genie
ra=284.66005 (18:58:38.41) dec=61.90520 (+61:54:18.7) +/- 0.6" mag=18.30+/-0.15
dist=1.0 REFID=5 major=1.1 minor=1.0 flag=0
Found 0 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)
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries 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:
Unmatched source ra=284.66005 (18:58:38.41) dec=61.90520 (+61:54:18.7) +/- 0.6" mag=18.30+/-0.15 dist=1.0 REFID=5 flag=0
There are 1.3373161E+05 counts in the bkg source region of 5982.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 22.356 counts/pixel (5-sig UL in 4" is 19.66 mag) for 1442454_g185
There are 1759.1372 counts in the src source region of 51.000000 pixels.
Rate in src region with 4 arcsec radius is 34.493 counts/pixel for 1442454_g185
There are 27726.691 counts in the cand_src_bkg source region of 1248.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 22.217 counts/pixel (5-sig UL in 4" is 19.67 mag) for 1442454_g185
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 20.22, XRT distances < 5.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1442454_790625012_260121d01h29m13s753616usUT_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(284.6744,61.9055,45")
fk5;-circle(284.676419766331,61.9146379224573,6")
fk5;-circle(284.66005138533,61.9051952042636,6")
fk5;-circle(284.687503280439,61.9073732773099,6")
Region file: 1442454_790625012_260121d01h29m13s753616usUT_cand_src.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(284.66005138533,61.9051952042636,4")
Region file: 1442454_790625012_260121d01h29m13s753616usUT_cand_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(284.66005138533,61.9051952042636,25")
fk5;-circle(284.66005138533,61.9051952042636,15")
image paragraph message for exposure 1 of trigger 1442454
------ Start for Possible Stand-alone Circular ----
In response to GRB260120 (Swift/BAT trigger 1442454) at 18:00:26 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 149 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:58:38.41 = 284.66005
DEC(J2000) = +61:54:18.7 = 61.90520
with a 90%-confidence error radius of about 0.63 arc sec. This position is 1.0
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.30 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.063.
------- notes for trigger 1442454 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 260121d01h29m18s645869usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1442454
-expid=790625012 -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/1442454/
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 790625012.3534 or about 0000:11708:18:03:36 UT
Found 406 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 53 sources in
srclist catalog. Found 14 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 9 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.22 mag. Found 74 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 7% of the Genie image region.
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?
790625012 148 WHITE 284.66078 61.90514 18.98/19.2 1.9 srclist Yes
790625012 148 WHITE 284.66005 61.90520 18.30/20.2 1.0 image Yes
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 61.90520
GRB_ERROR: 0.63
GRB_RA: 284.66005
MAGNITUDE: 18.30
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT