srclist overlap message for exposure 2 of trigger 1250617
uvot_overlap.pl vrs. 2010-12-20b fem started at 240825d23h26m14s603953usUT
The observation of trigger 1250617 started 2024-08-25T15:58:39.3
Examining file ./1250617_g339_uvot_sky_srclist.fits
The exposure ID is 746294319
The exposure time is undefined.
The filter is U.
The uvot region is centered at (344.5734,1.0312) with a roll angle of 39.8
It is square with sides of 8.03 arc min. for an area of 64.51 sq arc min
The BAT error circle is centered at (344.5510,1.0360) with a radius of 3.000 arc min
This is 1.374 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 28.07 sq. arc min or 0.99 of the BAT error circle
The XRT error circle is centered at (344.5720,1.0268) with a radius of 0.045 arc min
This is 0.280 arc min from the center of the uvot region
The area of the XRT error circle is 0.006 sq. arc min
The UVOT/XRT overlap is 0.006 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1250617
find_uvot_ag.pl vrs. 2023-04-25a fem started at 240825d23h26m24s018385usUT
Observation start time is 2024-08-25T15:58:39.3
Examining file ./1250617_g339_uvot_catalog_srclist.fits
The exposure ID is 746294319
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 16 detected source(s) for 1250617_g339
Aspect correction adds 0.00223 degrees (0.536 sec of time = 8.04 arc sec) to RA
Aspect correction adds 0.00082 degrees ( 2.94 arcsec) to Dec
Total aspect correction is 8.56 arcsec
Star catalogs centered at 344.5700 , 1.0184 with radius 4.73 arc min.
n_usno: 130 n_gsc: 122
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 14 matched entries is 0.767" for 1250617_g339
Mean and std. dev of mag. difference (MAG_DELTA) are 1.902 and 0.743 for 1250617_g339
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1250617_g339.
Acceptable entries have no ID, XRT distances < 6.75", 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=344.5510 (22:58:12.24) DEC= 1.0360 (+01:02:09.6)
XRT distances are from RA=344.5720 (22:58:17.28) DEC= 1.0268 (+01:01:36.3)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1250617_g339 with 5x5 stamp
ra=344.57216 (22:58:17.32) dec=1.02698 (+01:01:37.1) +/- 1.1" mag=17.71+/-0.35
dist=1.0 REFID=8
src: 0 distr. of nearby unmatched sources: 0 0 0 0 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)
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 mag
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1250617_g339 with 5x5 stamp
ra=344.55491 (22:58:13.18) dec=1.03136 (+01:01:52.9) +/- 1.1" mag=20.26+/-0.35
dist=63.7 REFID=16
*** The position of this source is inconsistent with the XRT position.
The position is 21.8 arc sec from the BAT position.
src: 2 distr. of nearby unmatched sources: 0 0 0 0 0
Found 1 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
344.5598 1.0326 18.3 -1 USNO-B1 20.77 99.99 99.99
*** If XRT position is correct, then this is NOT the afterglow
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=344.57216 (22:58:17.32) dec=1.02698 (+01:01:37.1) +/- 1.1" mag=17.71+/-0.35 dist=1.0 REFID=8
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 18.12, XRT distances < 6.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 1250617
------ Start for Possible Stand-alone Circular ----
In response to GRB240825 (Swift/BAT trigger 1250617) at 15:52:59 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
305 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 22:58:17.27 = 344.57196
DEC(J2000) = +01:01:36.5 = 1.02680
with a 90%-confidence error radius of about 0.75 arc sec. This position is 0.3
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.91 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.063.
------- notes for trigger 1250617 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 240825d23h26m26s139828usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1250617
-expid=746294319 -meonly -msg_srclist
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/1250617/
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 746294319.30218 or about 2024:238:15:58:34 UT
Found 126 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 16 sources in
srclist catalog. Found 2 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
20.52 mag. Found 31 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 4% 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?
746294319 305 U 344.57216 1.02698 17.71/18.1 1.0 srclist Yes
746294319 305 U 344.57196 1.02680 16.91/20.5 0.3 image Yes
List afterglow candidates for other finding charts.
746294106 92 WHITE 344.57194 1.02689 15.98/19.2 0.5 srclist Yes
746294106 92 WHITE 344.57192 1.02686 15.57/20.7 0.5 image Yes
746294872 858 WHITE 344.57206 1.02682 18.44/19.2 12.0 srclist Yes
746294872 858 WHITE 344.57192 1.02680 17.94/20.7 11.6 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 1.02680
GRB_ERROR: 0.75
GRB_RA: 344.57196
IMAGE_START_TIME: 15:58:34
MAGNITUDE: 16.91
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT