TDRSS lightcurve for Trigger=827924

Notes:

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

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 23 Apr 18 01:44:00 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     827924,   Seg_Num: 0
GRB_RA:          275.075d {+18h 20m 18s} (J2000),
                 275.297d {+18h 21m 11s} (current),
                 274.470d {+18h 17m 53s} (1950)
GRB_DEC:          +7.193d {+07d 11' 36"} (J2000),
                  +7.203d {+07d 12' 09"} (current),
                  +7.170d {+07d 10' 13"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=182773 [image_cnts]
TRIGGER_DUR:     776.000 [sec]   (=12.9 [min])
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:        18231 TJD;   113 DOY;   18/04/23
GRB_TIME:        5427.17 SOD {01:30:27.17} UT
GRB_PHI:         178.67 [deg]
GRB_THETA:        16.85 [deg]
SOLN_STATUS:     0x1000011D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    26.43 [sigma]
MERIT_PARAMS:     +0  +0 +95  +8  +1  +9  +0  +0 +38  +0 
SUN_POSTN:        30.67d {+02h 02m 40s}  +12.47d {+12d 28' 03"}
SUN_DIST:        112.83 [deg]   Sun_angle= 7.7 [hr] (West of Sun)
MOON_POSTN:      127.20d {+08h 28m 49s}  +18.46d {+18d 27' 19"}
MOON_DIST:       139.39 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:       35.85, 10.18 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      275.85, 30.53 [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 matches a source in the on-board catalog: Num=15304=(null) (a Fluence Trigger).  
COMMENTS:        This matches a source in the ground catalog: MAXI_J1820+070,   delta=0.018 [deg].  
COMMENTS:        This is not a GRB.  
COMMENTS:        This is an interesting source.  
COMMENTS:        This trigger occurred at longitude,latitude = 82.67,-4.59 [deg].  
COMMENTS:           

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 23 Apr 18 01:51:34 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     827924,   Seg_Num: 0
GRB_RA:          275.075d {+18h 20m 18s} (J2000),
                 275.297d {+18h 21m 11s} (current),
                 274.470d {+18h 17m 53s} (1950)
GRB_DEC:          +7.193d {+07d 11' 36"} (J2000),
                  +7.203d {+07d 12' 09"} (current),
                  +7.170d {+07d 10' 13"} (1950)
GRB_DATE:        18231 TJD;   113 DOY;   18/04/23
GRB_TIME:        5427.17 SOD {01:30:27.17} UT
TRIGGER_INDEX:   20000
GRB_PHI:         178.67 [deg]
GRB_THETA:        16.85 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     776.000 [sec]   (=12.9 [min])
SOLN_STATUS:     0x11D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    26.43 [sigma]
LC_URL:          sw00827924000msb.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

Plot creation:
Sun Apr 22 21:51:42 EDT 2018