TDRSS lightcurve for Trigger=821881

Notes:

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

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Apr 18 00:45:56 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     821881,   Seg_Num: 0
GRB_RA:           83.564d {+05h 34m 15s} (J2000),
                  83.721d {+05h 34m 53s} (current),
                  83.133d {+05h 32m 32s} (1950)
GRB_DEC:         -37.170d {-37d 10' 10"} (J2000),
                 -37.159d {-37d 09' 30"} (current),
                 -37.202d {-37d 12' 06"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4635 [cnts]    Image_Peak=231 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   137     E_range: 15-50 keV
BKG_INTEN:       29134 [cnts]
BKG_TIME:        2723.27 SOD {00:45:23.27} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18212 TJD;    94 DOY;   18/04/04
GRB_TIME:        2735.68 SOD {00:45:35.68} UT
GRB_PHI:          -8.78 [deg]
GRB_THETA:        32.49 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.85 [sigma]
IMAGE_SIGNIF:    8.76 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  -1  +0  +0 -20  +0 
SUN_POSTN:        13.08d {+00h 52m 20s}   +5.60d {+05d 36' 12"}
SUN_DIST:         78.23 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      235.70d {+15h 42m 48s}  -14.67d {-14d 40' 21"}
MOON_DIST:       121.84 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      241.98,-30.65 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       79.59,-60.38 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 231.86,1.90 [deg].  

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Apr 18 01:04:09 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     821881,   Seg_Num: 0
GRB_RA:           83.564d {+05h 34m 15s} (J2000),
                  83.721d {+05h 34m 53s} (current),
                  83.133d {+05h 32m 32s} (1950)
GRB_DEC:         -37.170d {-37d 10' 10"} (J2000),
                 -37.159d {-37d 09' 30"} (current),
                 -37.202d {-37d 12' 06"} (1950)
GRB_DATE:        18212 TJD;    94 DOY;   18/04/04
GRB_TIME:        2735.68 SOD {00:45:35.68} UT
TRIGGER_INDEX:   137
GRB_PHI:          -8.78 [deg]
GRB_THETA:        32.49 [deg]
DELTA_TIME:      38.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.85 [sigma]
IMAGE_SIGNIF:    8.76 [sigma]
LC_URL:          sw00821881000msb.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:
Tue Apr  3 21:06:00 EDT 2018