image overlap message for exposure 2 of trigger 965638
uvot_overlap.pl vrs. 2010-12-20b fem started at 200410d07h19m41s225088usUT
The observation of trigger 965638 started 2020-04-10T02:30:51.9
Examining file ./965638_g340_uvot_sky_image.fits
The exposure ID is 608178651
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (299.6445,51.7653) with a roll angle of 93.2
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 (299.6370,51.7630) with a radius of 3.000 arc min
This is 0.311 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 (299.6459,51.7808) with a radius of 0.032 arc min
This is 0.930 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 965638
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200410d07h19m55s033258usUT
Observation start time is 2020-04-10T02:30:51.9
Examining file ./965638_g340_uvot_catalog_image.fits
The exposure ID is 608178651
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 25 detected source(s) for 965638_g340
Aspect correction adds 0.00243 degrees (0.583 sec of time = 5.41 arc sec) to RA
Aspect correction adds -0.00005 degrees (-0.18 arcsec) to Dec
Total aspect correction is 5.42 arcsec
Star catalogs centered at 299.6414 , 51.7690 with radius 2.47 arc min.
n_usno: 182 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.712
RA DEC Mag Color
bright star 0: 299.58449 (19:58:20.28) 51.74991 (+51:44:59.7) 11.71 USNO-V
Mean distance difference (CAT_DELTA) for 24 matched entries is 0.513" for 965638_g340
Mean and std. dev of mag. difference (MAG_DELTA) are 1.049 and 0.637 for 965638_g340
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 965638_g340.
Acceptable entries have no ID, XRT distances < 5", 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=299.6370 (19:58:32.88) DEC=51.7630 (+51:45:46.8)
XRT distances are from RA=299.6459 (19:58:35.02) DEC=51.7808 (+51:46:50.8)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 965638_g340 with genie
ra=299.64471 (19:58:34.73) dec=51.76177 (+51:45:42.4) +/- 0.6" mag=17.08+/-0.15
dist=68.5 REFID=19 major=1.0 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 17.7 arc sec from the BAT position.
Found 4 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
299.6451 51.7614 1.5 -1 USNO-B1 17.28 15.59 16.34 *
299.6456 51.7609 3.8 -1 USNO-B1 17.97 15.11 16.38
299.6478 51.7612 7.2 -1 USNO-B1 99.99 19.15 99.99
299.6461 51.7600 7.3 -1 USNO-B1 18.61 15.64 16.96
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
Found 2 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
299.6478 51.7809 4.2 -1 USNO-B1 20.05 17.87 18.84
299.6440 51.7822 6.7 -1 USNO-B1 18.92 17.54 18.15
The closest star is 4.21" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=299.64417 (19:58:34.60) dec=51.78220 (+51:46:55.9) +/- 0.7" mag=18.65+/-0.17 dist=6.4 REFID=7 flag=0
There are 15919.737 counts in the bkg source region of 5528.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.880 counts/pixel (5-sig UL in 4" is 19.89 mag) for 965638_g340
There are 738.33508 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.729 counts/pixel for 965638_g340
XRT source is too far (55.8177320419533") 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 20.45, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 965638_608178651_200410d07h19m55s033258usUT_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(299.6445,51.7653,45")
fk5;-circle(299.6447057332,51.761773733375,6")
fk5;-circle(299.633968087547,51.7682928228968,6")
fk5;-circle(299.626204004878,51.7694387875862,6")
fk5;-circle(299.654777374298,51.7637950829659,6")
fk5;-circle(299.636256851169,51.7740239361522,6")
fk5;-circle(299.658423493656,51.7692220604114,6")
fk5;-circle(299.658039457978,51.7556801082675,6")
fk5;-circle(299.657603330947,51.7732440728958,6")
fk5;-circle(299.662263732839,51.7741535029157,6")
Region file: 965638_608178651_200410d07h19m55s033258usUT_xrt.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(299.64592,51.78078,8")
image paragraph message for exposure 2 of trigger 965638
SRCLIST PROBLEM: srclist filled telemetry buffer
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB200410 (Swift/BAT trigger 965638) at 02:25:10 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
316 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 100% of the
XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The
8'x8' region for the list of sources generated on-board covers 100% of the XRT
error circle. The list of sources is typically complete to about 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.15.
------- notes for trigger 965638 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200410d07h19m58s316573usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=965638
-expid=608178651 -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/965638/
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 608178651.85954 or about 2020:101:02:30:46 UT
Found 2508 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 22% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 18 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.12 mag.
Found 25 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 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.45 mag. Found 178 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 20% of the Genie image region.
Genie image analysis:
Found 15919.7 counts in the large background region of 5528.0 pixels or a rate
of 2.880 counts/pixel in a radius of 45.0 arcsec. Based on this background, the
typical 5-sigma UL at a random point in the Genie image is 19.93 mag. for a
4-arcsec aperture.
Found 738.3 counts in the XRT position region of 198.0 pixels or a rate of
3.729 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is 0.672 +/- 0.110 (1-sigma) cps or
18.81 mag and a range from 18.65 to 19.01 mag. The 3-sigma UL at the XRT
position is 1.003 cps or 18.38 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.30 mag. The closest
srclist source has ra= 299.6596 dec= 51.7835 mag=18.04 sep=31.99".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 299.6442 dec= 51.7822 mag=18.65 sep=6.44". The closest Genie
source has ra= 299.6442 dec= 51.7822 mag=18.65 sep=6.44".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 250 seconds with the U filter starting
316 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 19:58:34.60 = 299.64417
DEC(J2000) = +51:46:55.9 = 51.78220
with a 90%-confidence error radius of about 0.67 arc sec. This position is 6.44
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.65 with a 1-sigma error of about 0.17. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.15.
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?
608178651 315 U srclist found no candidates.
608178651 315 U image found no candidates.
List afterglow candidates for other finding charts.
608178439 103 WHITE srclist found no candidates.
608178439 103 WHITE image found no candidates.
608179206 870 WHITE srclist found no candidates.
608179206 870 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 51.78078
GRB_ERROR: 5
GRB_RA: 299.64592
IMAGE_START_TIME: 02:30:46
MAGNITUDE: 18.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT