TDRSS lightcurve for Trigger=638217

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 17 Apr 15 04:54:27 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     638217,   Seg_Num: 0
GRB_RA:          186.582d {+12h 26m 20s} (J2000),
                 186.775d {+12h 27m 06s} (current),
                 185.950d {+12h 23m 48s} (1950)
GRB_DEC:         +15.433d {+15d 25' 58"} (J2000),
                 +15.348d {+15d 20' 53"} (current),
                 +15.709d {+15d 42' 34"} (1950)
GRB_ERROR:       4.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1039 [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:        17129 TJD;   107 DOY;   15/04/17
GRB_TIME:        17570.54 SOD {04:52:50.54} UT
GRB_PHI:         169.34 [deg]
GRB_THETA:         5.74 [deg]
SOLN_STATUS:     0x1099D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    5.96 [sigma]
MERIT_PARAMS:     +0  +0 +125  +6  +1  -5  +0  +0 +85  +1 
SUN_POSTN:        24.94d {+01h 39m 45s}  +10.36d {+10d 21' 29"}
SUN_DIST:        148.62 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:        4.53d {+00h 18m 08s}   +2.33d {+02d 19' 45"}
MOON_DIST:       162.18 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      275.15, 76.93 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      179.73, 16.74 [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=12526=NGC4421,   delta=0.174 [deg].  
COMMENTS:        This matches a source in the ground catalog: NGC4421,   delta=0.174 [deg].  
COMMENTS:        This is a GRB in nearby galaxy or it is noise.  
COMMENTS:        This trigger occurred at longitude,latitude = 258.42,-20.43 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 17 Apr 15 05:10:37 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     638217,   Seg_Num: 0
GRB_RA:          186.582d {+12h 26m 20s} (J2000),
                 186.775d {+12h 27m 06s} (current),
                 185.950d {+12h 23m 48s} (1950)
GRB_DEC:         +15.433d {+15d 25' 58"} (J2000),
                 +15.348d {+15d 20' 53"} (current),
                 +15.709d {+15d 42' 34"} (1950)
GRB_DATE:        17129 TJD;   107 DOY;   15/04/17
GRB_TIME:        17570.54 SOD {04:52:50.54} UT
TRIGGER_INDEX:   20000
GRB_PHI:         169.34 [deg]
GRB_THETA:         5.74 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x99D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    5.96 [sigma]
LC_URL:          sw00638217000msb.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

Plot creation:
Fri Apr 17 01:11:23 EDT 2015