TDRSS lightcurve for Trigger=828953

Notes:

• 1) None of the TDRSS light curves are background subtracted.

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 26 Apr 18 05:57:02 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     828953,   Seg_Num: 0
GRB_RA:          245.197d {+16h 20m 47s} (J2000),
                 245.457d {+16h 21m 50s} (current),
                 244.486d {+16h 17m 57s} (1950)
GRB_DEC:         -15.593d {-15d 35' 35"} (J2000),
                 -15.636d {-15d 38' 08"} (current),
                 -15.475d {-15d 28' 29"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=3675 [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:        18234 TJD;   116 DOY;   18/04/26
GRB_TIME:        21347.15 SOD {05:55:47.15} UT
GRB_PHI:         -171.94 [deg]
GRB_THETA:        17.89 [deg]
SOLN_STATUS:     0x513
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    16.77 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +5  +0  +0 +85  +0 
SUN_POSTN:        33.66d {+02h 14m 37s}  +13.51d {+13d 30' 32"}
SUN_DIST:        149.18 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      171.18d {+11h 24m 42s}   +7.23d {+07d 14' 04"}
MOON_DIST:        77.01 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:      359.28, 23.65 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      246.04,  5.81 [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 does not match any source in the on-board catalog.  
COMMENTS:        This matches a source in the ground catalog: Sco_X-1,   delta=0.214 [deg].  
COMMENTS:        This is not a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 311.74,10.69 [deg].  
COMMENTS:           
COMMENTS:        This trigger occured while the StarTracker had lost lock, so it is possibly bogus.  

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 26 Apr 18 06:12:59 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     828953,   Seg_Num: 0
GRB_RA:          245.197d {+16h 20m 47s} (J2000),
                 245.457d {+16h 21m 50s} (current),
                 244.486d {+16h 17m 57s} (1950)
GRB_DEC:         -15.593d {-15d 35' 35"} (J2000),
                 -15.636d {-15d 38' 08"} (current),
                 -15.475d {-15d 28' 29"} (1950)
GRB_DATE:        18234 TJD;   116 DOY;   18/04/26
GRB_TIME:        21347.15 SOD {05:55:47.15} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -171.94 [deg]
GRB_THETA:        17.89 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x513
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    16.77 [sigma]
LC_URL:          sw00828953000msb.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:
Thu Apr 26 02:13:42 EDT 2018