image overlap message for exposure 2 of trigger 1420873
uvot_overlap.pl vrs. 2010-12-20b fem started at 251206d03h14m10s366022usUT
The observation of trigger 1420873 started 2025-12-05T23:45:30.8
Examining file ./1420873_g342_uvot_sky_image.fits
The exposure ID is 786671130
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (200.2775,29.9264) with a roll angle of 129.9
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 (200.2430,29.9620) with a radius of 3.000 arc min
This is 2.791 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 3.85 sq. arc min or 0.14 of the BAT error circle
The XRT error circle is centered at (200.2719,29.9289) with a radius of 0.040 arc min
This is 0.330 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 2 of trigger 1420873
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251206d03h14m21s625264usUT
Observation start time is 2025-12-05T23:45:30.8
Examining file ./1420873_g342_uvot_catalog_image.fits
The exposure ID is 786671130
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 3 detected source(s) for 1420873_g342
Aspect correction adds 0.00022 degrees (0.054 sec of time = 0.70 arc sec) to RA
Aspect correction adds -0.00165 degrees (-5.94 arcsec) to Dec
Total aspect correction is 5.98 arcsec
Star catalogs centered at 200.2770 , 29.9330 with radius 2.02 arc min.
n_usno: 39 n_gsc: 29
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 2 matched entries is 1.070" for 1420873_g342
Mean and std. dev of mag. difference (MAG_DELTA) are 2.228 and 0.207 for 1420873_g342
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1420873_g342.
Acceptable entries have no ID, XRT distances < 6", 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=200.2430 (13:20:58.32) DEC=29.9620 (+29:57:43.2)
XRT distances are from RA=200.2719 (13:21:05.26) DEC=29.9289 (+29:55:44.2)
*** WARNING 33 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1420873_g342 with genie
ra=200.27224 (13:21:05.34) dec=29.92872 (+29:55:43.4) +/- 0.8" mag=16.60+/-0.14
dist=1.3 REFID=1 major=1.0 minor=0.9 flag=0
Found 5 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
200.2725 29.9308 7.5 -1 USNO-B1 20.79 20.04 20.37
200.2721 29.9306 6.7 -1 USNO-B1 20.78 19.56 20.10
200.2694 29.9312 12.5 -1 USNO-B1 20.85 19.65 20.18
200.2722 29.9305 6.4 -1 GSC2.3 18.56 19.84 99.99
200.2695 29.9313 12.7 -1 GSC2.3 19.15 99.99 19.08
uvot_check_outside found 11 of 11 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
Found 3 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
200.2725 29.9308 6.9 -1 USNO-B1 20.79 20.04 20.37
200.2721 29.9306 6.0 -1 USNO-B1 20.78 19.56 20.10
200.2722 29.9305 5.7 -1 GSC2.3 18.56 19.84 99.99
The closest star is 5.70" away.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=200.27224 (13:21:05.34) dec=29.92872 (+29:55:43.4) +/- 0.8" mag=16.60+/-0.14 dist=1.3 REFID=1 flag=0
There are 50798.062 counts in the bkg source region of 6106.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 8.319 counts/pixel (5-sig UL in 4" is 19.31 mag) for 1420873_g342
There are 1306.5240 counts in the src source region of 47.000000 pixels.
Rate in src region with 4 arcsec radius is 27.798 counts/pixel for 1420873_g342
There are 10388.837 counts in the cand_src_bkg source region of 1243.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 8.358 counts/pixel (5-sig UL in 4" is 19.31 mag) for 1420873_g342
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 19.87, XRT distances < 6",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1420873_786671130_251206d03h14m21s625264usUT_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(200.2775,29.9264,45")
fk5;-circle(200.272243884536,29.9287194290502,6")
fk5;-circle(200.281452796158,29.9371134459818,6")
Region file: 1420873_786671130_251206d03h14m21s625264usUT_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(200.272243884536,29.9287194290502,4")
Region file: 1420873_786671130_251206d03h14m21s625264usUT_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(200.272243884536,29.9287194290502,25")
fk5;-circle(200.272243884536,29.9287194290502,15")
image paragraph message for exposure 2 of trigger 1420873
------ Start for Possible Stand-alone Circular ----
In response to GRB251205 (Swift/BAT trigger 1420873) at 23:39:47 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
306 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 13:21:05.34 = 200.27224
DEC(J2000) = +29:55:43.4 = 29.92872
with a 90%-confidence error radius of about 0.75 arc sec. This position is 1.3
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.60 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.014.
------- notes for trigger 1420873 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251206d03h14m26s217544usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1420873
-expid=786671130 -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/1420873/
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 786671130.83704 or about 2025:340:23:45:25 UT
Found 282 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 22 sources in
srclist catalog. Found 7 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 3 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
19.87 mag. Found 35 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 5% 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?
786671130 305 U 200.27224 29.92884 16.96/18.1 1.1 srclist Yes
786671130 305 U 200.27224 29.92872 16.60/19.9 1.3 image Yes
List afterglow candidates for other finding charts.
786670973 148 WHITE 200.27250 29.92887 18.17/19.2 1.8 srclist Yes
786670973 148 WHITE 200.27223 29.92888 17.54/20.4 1.0 image Yes
786671683 858 ? srclist data are not available.
786671683 858 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 29.92872
GRB_ERROR: 0.75
GRB_RA: 200.27224
IMAGE_START_TIME: 23:45:25
MAGNITUDE: 16.60
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT