TDRSS lightcurve for Trigger=958733

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Feb 20 11:15:47 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     958733,   Seg_Num: 0
GRB_RA:          252.026d {+16h 48m 06s} (J2000),
                 252.252d {+16h 49m 00s} (current),
                 251.466d {+16h 45m 52s} (1950)
GRB_DEC:         +16.960d {+16d 57' 37"} (J2000),
                 +16.926d {+16d 55' 33"} (current),
                 +17.047d {+17d 02' 51"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       29390 [cnts]    Image_Peak=388 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   454     E_range: 15-50 keV
BKG_INTEN:       215343 [cnts]
BKG_TIME:        40391.48 SOD {11:13:11.48} UT
BKG_DUR:         64 [sec]
GRB_DATE:        18907 TJD;    59 DOY;   20/02/28
GRB_TIME:        40481.15 SOD {11:14:41.15} UT
GRB_PHI:         145.68 [deg]
GRB_THETA:        39.30 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     9.74 [sigma]
IMAGE_SIGNIF:    7.13 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +1  -3  +0  +0  +2  +0 
SUN_POSTN:       340.90d {+22h 43m 37s}   -8.07d {-08d 04' 14"}
SUN_DIST:         91.07 [deg]   Sun_angle= 5.9 [hr] (West of Sun)
MOON_POSTN:       31.27d {+02h 05m 04s}   +7.84d {+07d 50' 25"}
MOON_DIST:       132.51 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:       35.45, 34.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      247.67, 39.02 [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 = 285.53,0.93 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(2.0<100sec) coincident with the FERMI_GBM event (trignum=604581288).  

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Feb 20 11:31:58 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     958733,   Seg_Num: 0
GRB_RA:          252.026d {+16h 48m 06s} (J2000),
                 252.252d {+16h 49m 00s} (current),
                 251.466d {+16h 45m 52s} (1950)
GRB_DEC:         +16.960d {+16d 57' 37"} (J2000),
                 +16.926d {+16d 55' 33"} (current),
                 +17.047d {+17d 02' 51"} (1950)
GRB_DATE:        18907 TJD;    59 DOY;   20/02/28
GRB_TIME:        40481.15 SOD {11:14:41.15} UT
TRIGGER_INDEX:   454
GRB_PHI:         145.68 [deg]
GRB_THETA:        39.30 [deg]
DELTA_TIME:      -5.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.74 [sigma]
IMAGE_SIGNIF:    7.13 [sigma]
LC_URL:          sw00958733000msb.lc

GCN template for BAT paragraph

  • Click here!
    At 11:14:41 UT, the Swift Burst Alert Telescope (BAT) triggered and
    located GRB 200228 ***A*** (trigger=958733).  Swift slewed immediately to the burst.
    The BAT on-board calculated location is 
    RA, Dec 252.026, +16.960 which is 
       RA(J2000) = 16h 48m 06s
       Dec(J2000) = +16d 57' 37"
    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 ~2268 counts/sec (15-350 keV), at ~183 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 T90 duration: 183.744 s +/- 44.0574 s
      Estimated T50 duration: 183.744 s +/- 96.7465 s
      Estimated Peak Interval: MET   604581308.16000009 +/- 0.500000 s
      Estimated background rate 1:     5584.058 near MET 604581292.640000 s
      Estimated background rate 2:     7546.143 near MET 604581489.472000 s
      Estimated total duration: 183.744 s (for data selection)
           (from MET 604581303.680000 to MET 604581487.424000)
      Estimated total fluence: -173708.754571 count
      Created GTI with 10 entries
    ------------------------------------------
     
    

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

    bat_grb_pos_cat.sh 252.026 16.960 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 252.026 16.960
    No match
    

    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: 2020 2 28 11 272.848506  -9.397052
     Obj: 2020 2 28 11 342.839958  67.104207
    
  • the object visibility at GSFC, Greenbelt, Maryland
     
    MMT Observatory, Mt. Hopkins, Arizona
          TimeUT       Azimuth     Elevation
     Sun: 2020 2 28 11 254.515792  -37.626189
     Obj: 2020 2 28 11 281.917929  50.183759
    
  • the object visibility at MMT, Mt. Hopkins, Arizona
     
    Hale Telescope, Palomar Mountain, California
          TimeUT       Azimuth     Elevation
     Sun: 2020 2 28 11 248.657458  -41.887216
     Obj: 2020 2 28 11 279.465551  44.915022
    
  • the object visibility at Hale Telescope, Palomar Mt., California
     
    Mauna Kea, Hawaii
          TimeUT       Azimuth     Elevation
     Sun: 2020 2 28 11 206.653269  -76.942356
     Obj: 2020 2 28 11 255.411137  9.743320
    
  • the object visibility at Mauna Kea, Hawaii
     
    Siding Spring Obs., Australia
          TimeUT       Azimuth     Elevation
     Sun: 2020 2 28 11 58.976812  -28.428603
     Obj: 2020 2 28 11 282.799493  -51.835004
    
  • the object visibility at Siding Spring Obs., Australia
     
    Tokyo, Japan
          TimeUT       Azimuth     Elevation
     Sun: 2020 2 28 11 96.911145  -24.173514
     Obj: 2020 2 28 11 206.278064  -34.435875
    
  • the object visibility at Tokyo, Japan
     
    William Herschel Telescope, La Palma, Canary Islands, Spain
          TimeUT       Azimuth     Elevation
     Sun: 2020 2 28 11 310.633536  39.010304
     Obj: 2020 2 28 11 87.923470  40.900569
    
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
     
    Gemini South, Cerro Pachon, Chile
          TimeUT       Azimuth     Elevation
     Sun: 2020 2 28 11 276.801053  4.342679
     Obj: 2020 2 28 11 181.285754  42.701798
    
  • the object visibility at Gemini South, Cerro Pachon, Chile
     
     
     
    The data/results are in /local/data/bat1/prebascript/trigger958733/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:
    Fri Feb 28 06:32:23 EST 2020