TDRSS lightcurve for Trigger=811686

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 25 Feb 18 20:32:09 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     811686,   Seg_Num: 0
GRB_RA:          185.609d {+12h 22m 26s} (J2000),
                 185.836d {+12h 23m 21s} (current),
                 184.983d {+12h 19m 56s} (1950)
GRB_DEC:         +29.293d {+29d 17' 34"} (J2000),
                 +29.192d {+29d 11' 32"} (current),
                 +29.570d {+29d 34' 12"} (1950)
GRB_ERROR:       4.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=984 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        18174 TJD;    56 DOY;   18/02/25
GRB_TIME:        73851.46 SOD {20:30:51.46} UT
GRB_PHI:          11.97 [deg]
GRB_THETA:        31.47 [deg]
SOLN_STATUS:     0x1099D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    6.20 [sigma]
MERIT_PARAMS:     +0  +0 +125  +6  +1  -4  +0  +0 +84  +1 
SUN_POSTN:       338.90d {+22h 35m 36s}   -8.87d {-08d 52' 11"}
SUN_DIST:        147.58 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      101.36d {+06h 45m 26s}  +20.19d {+20d 11' 18"}
MOON_DIST:        75.69 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      192.53, 83.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      172.36, 28.87 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This is a low-flux event whose position matches one of the nearby galaxy sources in the on-board catalog!  
COMMENTS:        This matches a source in the on-board catalog: Num=12182=NGC4310,   delta=0.084 [deg].  
COMMENTS:        This matches a source in the ground catalog: NGC4310,   delta=0.084 [deg].  
COMMENTS:        Galaxy NGC4310 (of total mag=13.00 and dia=2.60 arcmin) is inside the position error circle.  
COMMENTS:        There is a 0.09% probability that an NGC galaxy would happen by chance coincidence.  
COMMENTS:        This is a GRB in nearby galaxy or it is noise.

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 25 Feb 18 20:47:45 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     811686,   Seg_Num: 0
GRB_RA:          185.609d {+12h 22m 26s} (J2000),
                 185.836d {+12h 23m 21s} (current),
                 184.983d {+12h 19m 56s} (1950)
GRB_DEC:         +29.293d {+29d 17' 34"} (J2000),
                 +29.192d {+29d 11' 32"} (current),
                 +29.570d {+29d 34' 12"} (1950)
GRB_DATE:        18174 TJD;    56 DOY;   18/02/25
GRB_TIME:        73851.46 SOD {20:30:51.46} UT
TRIGGER_INDEX:   20000
GRB_PHI:          11.97 [deg]
GRB_THETA:        31.47 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x99D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    6.20 [sigma]
LC_URL:          sw00811686000msb.lc

Initial TDRSS lightcurve and spacecraft attitude plot

TDRSS lightcurve from T0-30 to T0+50 (zoom in)

TDRSS light curve from T0-1 to T0+2 (More zoom in)

1.6s binned TDRSS light curve

Extended TDRSS light curve and spacecraft attitude plot(s)

Extended TDRSS lc No.1

Extended TDRSS lc No.2

Extended TDRSS lc No.3

Extended TDRSS lc No.4

Plot creation:
Sun Feb 25 15:48:08 EST 2018