TDRSS lightcurve for Trigger=890732

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Feb 19 06:19:55 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     890732,   Seg_Num: 0
GRB_RA:          247.821d {+16h 31m 17s} (J2000),
                 248.175d {+16h 32m 42s} (current),
                 246.897d {+16h 27m 35s} (1950)
GRB_DEC:         -47.792d {-47d 47' 30"} (J2000),
                 -47.832d {-47d 49' 54"} (current),
                 -47.685d {-47d 41' 04"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=6526 [image_cnts]
TRIGGER_DUR:     384.000 [sec]   (=6.4 [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:        18540 TJD;    57 DOY;   19/02/26
GRB_TIME:        22369.51 SOD {06:12:49.51} UT
GRB_PHI:         -97.52 [deg]
GRB_THETA:        20.69 [deg]
SOLN_STATUS:     0x11D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    11.43 [sigma]
MERIT_PARAMS:     +0  +0 +124  +7  +1  +1  +0  +1  -9  +0 
SUN_POSTN:       339.06d {+22h 36m 13s}   -8.81d {-08d 48' 28"}
SUN_DIST:         84.07 [deg]   Sun_angle= 6.1 [hr] (West of Sun)
MOON_POSTN:      243.67d {+16h 14m 41s}  -17.05d {-17d 02' 43"}
MOON_DIST:        31.01 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      336.30,  0.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      253.67,-25.60 [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=10577=4U_1630-47_SGR,   delta=0.800 [deg].  
COMMENTS:        This matches a source in the ground catalog: AX_1631.9-4752,   delta=0.153 [deg].  
COMMENTS:        This is not a GRB.  
COMMENTS:        This is an interesting source.  
COMMENTS:        This trigger occurred at longitude,latitude = 321.61,20.61 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Feb 19 06:32:39 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     890732,   Seg_Num: 0
GRB_RA:          247.821d {+16h 31m 17s} (J2000),
                 248.175d {+16h 32m 42s} (current),
                 246.897d {+16h 27m 35s} (1950)
GRB_DEC:         -47.792d {-47d 47' 30"} (J2000),
                 -47.832d {-47d 49' 54"} (current),
                 -47.685d {-47d 41' 04"} (1950)
GRB_DATE:        18540 TJD;    57 DOY;   19/02/26
GRB_TIME:        22369.51 SOD {06:12:49.51} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -97.52 [deg]
GRB_THETA:        20.69 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     384.000 [sec]   (=6.4 [min])
SOLN_STATUS:     0x11D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    11.43 [sigma]
LC_URL:          sw00890732000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 06:12:49 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 190226 ***A*** (trigger=890732).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 247.821, -47.792 which is 
   RA(J2000) = 16h 31m 17s
   Dec(J2000) = -47d 47' 30"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a [**double-peaked**]
structure with a duration of about TTT sec.  The peak count rate
was ~1060 counts/sec (15-350 keV), at ~7 sec after the trigger.
  • Test version of draft template

    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

    Tilan's background subtracted TDRSS light curves

    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

    TDRSS extended lightcurve from T0-1 to T0+2

    T50 and T90 calculation

    ******************************************
         battblocks v1.18
------------------------------------------
     Input Data: bat_raw_lc.fits
     Output GTI: bb.gti
 Events to Skip: 128     Changepoint log(prob) Prior: 6.000000
  Internal Tick: 1.000000e-04 s
  Lookback time: 0 s
 Bkg. Subtract?: yes (for fluence/T50/T90 calculations)
------------------------------------------
  Estimated background rate 1:     4199.316 near MET 572854440.192000 s
  Estimated background rate 2:     4252.670 near MET 572854545.152000 s
  Estimated total fluence: 0.000000 count
  Created GTI with 2 entries
------------------------------------------

    Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)

    bat_grb_pos_cat.sh 247.821 -47.792 0.083
No match

    Search for this GRB position to the source locations in BAT transient monitor (search radius within 12 arcmin)

    python compare_catalog.py 247.821 -47.792
AX J1631.9-4752 20010 248.008 -47.874 0.14985566182455878

    Link to SIMBAD

  • Click here for the SIMBAD search!

    Frank's UVOT result

  • Click here!

    Frank's UVOT Blinking images

  • Click here!

    Elevation angle of GRB/Sun at the ground telescope locations

    GSFC, Greenbelt, Maryland
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 26 6 198.033438  -58.680049
 Obj: 2019 2 26 6 314.588343  -21.973648
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 26 6 129.672266  -57.681817
 Obj: 2019 2 26 6 308.495615  -38.298987
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 26 6 124.020798  -52.647441
 Obj: 2019 2 26 6 306.798198  -43.309106
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 26 6 88.443918  -22.490840
 Obj: 2019 2 26 6 332.954911  -56.986854
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 26 6 101.205551  34.025173
 Obj: 2019 2 26 6 22.025461  -5.305087
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 26 6 47.711754  33.312444
 Obj: 2019 2 26 6 54.440902  -50.531651
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 26 6 267.454962  -23.171888
 Obj: 2019 2 26 6 345.970389  11.140853
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 26 6 337.010372  -48.214049
 Obj: 2019 2 26 6 310.224306  32.348320
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger890732/tdrss_ql/
 
bat_raw_lc.fits  : TDRSS FITS light curve from GCN
gcn_position.txt : GCN BAT position notice
ratelc_tdrss.qdp : QDP file of the TDRSS light curve
tdrss_lc.gif     : GIF TDRSS light curve
sc_att.qdp       : QDP file of the spacecraft attitude
sc_att.gif       : GIF spacecraft attitude
bb.gti           : Bayesian block GTI file (battblocks)
dur.gti          : Duration GTI file (battblocks)
battblocks.log   : Output log of battblocks
 


    Plot creation:
Tue Feb 26 01:33:03 EST 2019