image overlap message for exposure 1 of trigger 895503
uvot_overlap.pl vrs. 2010-12-20b fem started at 190327d23h24m30s666392usUT
The observation of trigger 895503 started 2019-03-27T23:17:45.9
Examining file 895503_g91_uvot_sky_image.fits
The exposure ID is 575421465
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (297.8214,39.0686) with a roll angle of 101.7
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 (297.8160,39.0700) with a radius of 3.000 arc min
This is 0.265 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
Could not find the location of an XRT error circle
image afterglow message for exposure 1 of trigger 895503
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190327d23h24m31s669896usUT
Observation start time is 2019-03-27T23:17:45.9
Examining file 895503_g91_uvot_catalog_image.fits
The exposure ID is 575421465
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 61 detected source(s) for 895503_g91
Aspect correction adds 0.00177 degrees (0.424 sec of time = 4.94 arc sec) to RA
Aspect correction adds -0.00010 degrees (-0.36 arcsec) to Dec
Total aspect correction is 4.95 arcsec
Star catalogs centered at 297.8198 , 39.0689 with radius 2.61 arc min.
n_usno: 396 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.69986
RA DEC Mag Color
bright star 0: 297.83911 (19:51:21.39) 39.05924 (+39:03:33.2) 11.70 USNO-V
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 62 matched entries is 0.516" for 895503_g91
Mean and std. dev of mag. difference (MAG_DELTA) are 1.261 and 0.434 for 895503_g91
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 895503_g91.
Acceptable entries have no ID, BAT distance < 200" or XRT distance < 10", 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=297.8160 (19:51:15.84) DEC=39.0700 (+39:04:12.0)
XRT distances are as reported in catalog file.
-----------------
Entry 28 in the list of sources is a candidate afterglow for 895503_g91 with genie
ra=297.83484 (19:51:20.36) dec=39.07434 (+39:04:27.6) +/- 0.6" mag=18.58+/-0.15
dist=54.9 REFID=29 major=1.3 minor=1.0 flag=0
Found 8 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
297.8315 39.0727 11.0 -1 USNO-B1 15.85 14.92 15.33
297.8346 39.0690 19.3 -1 USNO-B1 15.62 15.58 15.60
297.8348 39.0694 17.9 -1 USNO-B1 15.47 14.79 15.09
297.8325 39.0786 16.8 -1 USNO-B1 18.07 17.24 17.61
297.8319 39.0790 18.8 -1 USNO-B1 17.25 16.45 16.81
297.8386 39.0750 10.8 -1 USNO-B1 18.14 17.05 17.53
297.8378 39.0773 13.4 -1 USNO-B1 14.21 12.40 13.21
297.8407 39.0772 19.3 -1 USNO-B1 18.65 16.88 17.66
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
-----------------
Entry 30 in the list of sources is a candidate afterglow for 895503_g91 with genie
ra=297.80188 (19:51:12.45) dec=39.08095 (+39:04:51.4) +/- 0.6" mag=13.69+/-0.14
dist=55.8 REFID=15 major=0.8 minor=0.7 flag=2 (blended)
This source is near the edge of image (0.883)
Found 7 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
297.8035 39.0797 6.4 -1 USNO-B1 14.54 99.99 99.99
297.8072 39.0824 15.7 -1 USNO-B1 17.83 16.73 17.22
297.8027 39.0804 2.9 -1 USNO-B1 99.99 12.30 99.99 *
297.8022 39.0801 3.2 -1 USNO-B1 18.35 12.70 15.21 *
297.8047 39.0844 14.8 -1 USNO-B1 19.72 18.23 18.89
297.8014 39.0838 10.5 -1 USNO-B1 19.06 18.08 18.51
297.7967 39.0847 19.7 -1 USNO-B1 17.71 16.48 17.03
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
There are 81907.023 counts in the bkg source region of 4366.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 18.760 counts/pixel (5-sig UL in 4" is 19.76 mag) for 895503_g91
There are 1405.0895 counts in the src source region of 47.000000 pixels.
Rate in src region with 4 arcsec radius is 29.896 counts/pixel for 895503_g91
There are 16240.356 counts in the cand_src_bkg source region of 870.00000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 18.667 counts/pixel (5-sig UL in 4" is 19.76 mag) for 895503_g91
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.75, BAT distances < 200",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 895503_575421465_190327d23h24m31s669896usUT_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(297.8214,39.0686,45")
fk5;-circle(297.819088709749,39.0679492072203,6")
fk5;-circle(297.810623381578,39.0699338183874,6")
fk5;-circle(297.822226961648,39.0690454670805,6")
fk5;-circle(297.810110610555,39.0644261163848,6")
fk5;-circle(297.820105531628,39.0765271895904,6")
fk5;-circle(297.811629717555,39.0766017864207,6")
fk5;-circle(297.806185035604,39.0707196144042,6")
fk5;-circle(297.824622061859,39.0751948280599,6")
fk5;-circle(297.80557715331,39.0672395897023,6")
fk5;-circle(297.813898878036,39.0791848846102,6")
fk5;-circle(297.825571551602,39.0636570878025,6")
fk5;-circle(297.814778172919,39.0590760737481,6")
fk5;-circle(297.82201048809,39.0801204591852,6")
fk5;-circle(297.830882985914,39.0676272015263,6")
fk5;-circle(297.827186369104,39.0780121156896,6")
fk5;-circle(297.823524065654,39.0806334164618,6")
fk5;-circle(297.831644506186,39.0727209928336,6")
fk5;-circle(297.832266134069,39.0655900521614,6")
fk5;-circle(297.834769453373,39.0695114228468,6")
fk5;-circle(297.834841407589,39.0743363008685,6")
fk5;-circle(297.831878759594,39.0792083440333,6")
Region file: 895503_575421465_190327d23h24m31s669896usUT_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(297.834841407589,39.0743363008685,4")
Region file: 895503_575421465_190327d23h24m31s669896usUT_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(297.834841407589,39.0743363008685,25")
fk5;-circle(297.834841407589,39.0743363008685,15")
fk5;-circle(297.824622061859,39.0751948280599,6")
fk5;-circle(297.830882985914,39.0676272015263,6")
fk5;-circle(297.827186369104,39.0780121156896,6")
fk5;-circle(297.831644506186,39.0727209928336,6")
fk5;-circle(297.834769453373,39.0695114228468,6")
fk5;-circle(297.831878759594,39.0792083440333,6")
fk5;-circle(297.833108652937,39.082646253414,6")
fk5;-circle(297.837713930819,39.0772962541488,6")
fk5;-circle(297.838509431071,39.0812771912008,6")
image paragraph message for exposure 1 of trigger 895503
SRCLIST PROBLEM: multiple afterglow candidates
------ Start for Possible Stand-alone Circular ----
In response to GRB190327 (Swift/BAT trigger 895503) at 23:16:13 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 69 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 19:51:20.36 = 297.83484
DEC(J2000) = +39:04:27.6 = 39.07434
with a 90%-confidence error radius of about 0.64 arc sec. This position is 54.9
arc sec. from the center of the BAT error circle. The estimated magnitude is
18.58 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.25.
------- notes for trigger 895503 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190327d23h24m33s244866usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=895503
-expid=575421465 -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/895503/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
No XRT position found for srclist. No XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 575421465.89904 or about 2019:086:23:17:40 UT
Found 1991 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 40% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 11 srclist
source(s) without IDs. There are 2 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.66 mag. More than 1 candidate
indicates that the srclist candidates are UNRELIABLE.
Found 61 source(s) in Genie image catalog. 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 19.75 mag. Found 392 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
39% 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?
575421465 68 WHITE 297.78402 39.03139 17.47/18.7 165.3 srclist Yes
575421465 68 WHITE 297.74823 39.05393 18.41/18.7 198.1 srclist Yes
575421465 68 WHITE 297.83484 39.07434 18.58/19.8 54.9 image Yes
List afterglow candidates for other finding charts.
No unique and reliable afterglow was found.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 39.07434
GRB_ERROR: 0.64
GRB_RA: 297.83484
IMAGE_START_TIME: 23:17:40
MAGNITUDE: 18.58
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: BAT