image overlap message for exposure 1 of trigger 1306404
uvot_overlap.pl vrs. 2010-12-20b fem started at 250424d12h21m47s982073usUT
The observation of trigger 1306404 started 2025-04-24T06:57:18.5
Examining file ./1306404_g289_uvot_sky_image.fits
The exposure ID is 767170638
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (217.5180,-35.0294) with a roll angle of 166.1
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 (217.5130,-35.0220) with a radius of 3.000 arc min
This is 0.508 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 (217.4992,-35.0251) with a radius of 0.035 arc min
This is 0.959 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1306404
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250424d12h21m51s671680usUT
Observation start time is 2025-04-24T06:57:18.5
Examining file ./1306404_g289_uvot_catalog_image.fits
The exposure ID is 767170638
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 22 detected source(s) for 1306404_g289
Aspect correction adds 0.00038 degrees (0.091 sec of time = 1.12 arc sec) to RA
Aspect correction adds -0.00128 degrees (-4.60 arcsec) to Dec
Total aspect correction is 4.74 arcsec
Star catalogs centered at 217.5197 , -35.0245 with radius 2.61 arc min.
n_usno: 138 n_gsc: 141
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.7266
RA DEC Mag Color
bright star 0: 217.48627 (14:29:56.70) -35.05387 (-35:03:13.9) 11.73 GSC-F
Mean distance difference (CAT_DELTA) for 21 matched entries is 0.348" for 1306404_g289
Mean and std. dev of mag. difference (MAG_DELTA) are 1.171 and 0.775 for 1306404_g289
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1306404_g289.
Acceptable entries have no ID, XRT distances < 5.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=217.5130 (14:30:03.12) DEC=-35.0220 (-35:01:19.2)
XRT distances are from RA=217.4992 (14:29:59.81) DEC=-35.0251 (-35:01:30.2)
-----------------
Entry 9 in the list of sources is a candidate afterglow for 1306404_g289 with genie
ra=217.49998 (14:29:59.99) dec=-35.02518 (-35:01:30.6) +/- 0.6" mag=18.80+/-0.15
dist=2.3 REFID=15 major=1.0 minor=0.9 flag=0
Found 6 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
217.5056 -35.0233 18.0 -1 USNO-B1 19.17 17.95 18.49
217.5032 -35.0242 9.9 -1 USNO-B1 19.40 18.95 19.15
217.5020 -35.0208 16.8 -1 USNO-B1 18.99 17.57 18.20
217.5055 -35.0233 17.6 -1 GSC2.3 18.06 20.06 99.99
217.5030 -35.0243 9.5 -1 GSC2.3 19.46 20.75 99.99
217.5019 -35.0209 16.5 -1 GSC2.3 17.72 19.76 99.99
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
-----------------
Entry 22 in the list of sources is a candidate afterglow for 1306404_g289 with genie
ra=217.54699 (14:30:11.28) dec=-35.02559 (-35:01:32.1) +/- 1.2" mag=21.38+/-0.36
dist=140.9 REFID=16 major=0.5 minor=0.5 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 98.1 arc sec from the BAT position.
This source is near the edge of image (0.987)
Found 6 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
217.5435 -35.0215 17.8 -1 USNO-B1 17.26 16.30 16.72
217.5480 -35.0259 3.3 -1 USNO-B1 17.74 16.89 17.27 *
217.5506 -35.0234 13.3 -1 USNO-B1 19.47 18.57 18.97
217.5434 -35.0216 18.0 -1 GSC2.3 16.32 17.12 99.99
217.5479 -35.0260 2.9 -1 GSC2.3 16.98 17.88 99.99 *
217.5505 -35.0234 13.0 -1 GSC2.3 18.82 21.10 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:
Unmatched source ra=217.49998 (14:29:59.99) dec=-35.02518 (-35:01:30.6) +/- 0.6" mag=18.80+/-0.15 dist=2.3 REFID=15 flag=0
There are 50974.582 counts in the bkg source region of 5830.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 8.743 counts/pixel (5-sig UL in 4" is 20.17 mag) for 1306404_g289
There are 870.18323 counts in the src source region of 50.000000 pixels.
Rate in src region with 4 arcsec radius is 17.404 counts/pixel for 1306404_g289
source too far 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 20.73, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1306404_767170638_250424d12h21m51s671680usUT_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(217.5180,-35.0294,45")
fk5;-circle(217.515451154817,-35.0228654236198,6")
fk5;-circle(217.507575922487,-35.0199049925972,6")
fk5;-circle(217.505418606986,-35.023367350476,6")
fk5;-circle(217.524448056158,-35.0212067741297,6")
fk5;-circle(217.50822747244,-35.0322888260359,6")
fk5;-circle(217.531439238744,-35.0368759385345,6")
Region file: 1306404_767170638_250424d12h21m51s671680usUT_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(217.49997790323,-35.0251790006343,4")
image paragraph message for exposure 1 of trigger 1306404
------ Start for Possible Stand-alone Circular ----
In response to GRB250424 (Swift/BAT trigger 1306404) at 06:52:28 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 254 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 14:29:60.00 = 217.49998
DEC(J2000) = -35:01:30.6 = -35.02518
with a 90%-confidence error radius of about 0.63 arc sec. This position is 2.3
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.80 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.064.
------- notes for trigger 1306404 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250424d12h22m24s879985usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1306404
-expid=767170638 -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/1306404/
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 767170638.46368 or about 2025:115:06:57:13 UT
Found 865 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 14% of the srclist region. Found 181 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 20 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 22 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 2 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.73 mag. Found 141 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 14% 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?
767170638 254 WHITE 217.49997 -35.02503 19.15/19.2 2.2 srclist Yes
767170638 254 WHITE 217.49998 -35.02518 18.80/20.7 2.3 image Yes
List afterglow candidates for other finding charts.
767171239 855 WHITE srclist found no candidates.
767171239 855 ? image data are not available.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -35.02518
GRB_ERROR: 0.63
GRB_RA: 217.49998
IMAGE_START_TIME: 06:57:13
MAGNITUDE: 18.80
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT