TDRSS lightcurve for Trigger=1070298

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 25 Aug 21 06:53:45 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1070298,   Seg_Num: 0
GRB_RA:          238.836d {+15h 55m 21s} (J2000),
                 239.256d {+15h 57m 01s} (current),
                 237.869d {+15h 51m 29s} (1950)
GRB_DEC:         -54.070d {-54d 04' 12"} (J2000),
                 -54.132d {-54d 07' 55"} (current),
                 -53.924d {-53d 55' 26"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       269 [cnts]    Image_Peak=51 [image_cnts]
TRIGGER_DUR:     0.016 [sec] 
TRIGGER_INDEX:   10210     E_range: 15-50 keV
BKG_INTEN:       19826 [cnts]
BKG_TIME:        24796.39 SOD {06:53:16.39} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19451 TJD;   237 DOY;   21/08/25
GRB_TIME:        24807.27 SOD {06:53:27.27} UT
GRB_PHI:         125.89 [deg]
GRB_THETA:        32.83 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     42.22 [sigma]
IMAGE_SIGNIF:    9.65 [sigma]
MERIT_PARAMS:     +1  +0  +0  -6  +1  +0  +0  +1  +9  +0 
SUN_POSTN:       154.29d {+10h 17m 09s}  +10.65d {+10d 39' 05"}
SUN_DIST:         95.70 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:        7.55d {+00h 30m 11s}   -1.41d {-01d 24' 52"}
MOON_DIST:       110.06 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      327.89, -0.36 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      248.80,-32.90 [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 = 116.36,-11.43 [deg].  

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 25 Aug 21 07:12:28 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1070298,   Seg_Num: 0
GRB_RA:          238.836d {+15h 55m 21s} (J2000),
                 239.256d {+15h 57m 01s} (current),
                 237.869d {+15h 51m 29s} (1950)
GRB_DEC:         -54.070d {-54d 04' 12"} (J2000),
                 -54.132d {-54d 07' 55"} (current),
                 -53.924d {-53d 55' 26"} (1950)
GRB_DATE:        19451 TJD;   237 DOY;   21/08/25
GRB_TIME:        24807.57 SOD {06:53:27.57} UT
TRIGGER_INDEX:   10210
GRB_PHI:         125.89 [deg]
GRB_THETA:        32.83 [deg]
DELTA_TIME:      2.00 [sec]
TRIGGER_DUR:     0.016 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     42.22 [sigma]
IMAGE_SIGNIF:    9.65 [sigma]
LC_URL:          sw01070298000msb.lc

GCN template for BAT paragraph

  • Click here!
    At 06:53:27 UT, the Swift Burst Alert Telescope (BAT) triggered and
    located GRB 210825 ***A*** (trigger=1070298).  Swift slewed immediately to the burst.
    The BAT on-board calculated location is 
    RA, Dec 238.836, -54.070 which is 
       RA(J2000) = 15h 55m 21s
       Dec(J2000) = -54d 04' 12"
    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 ~3242 counts/sec (15-350 keV), at ~0 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

    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: 50.816 s +/- 22.725 s
      Estimated T50 duration: 50.816 s +/- 31.0664 s
      Estimated Peak Interval: MET   651567288.00000000 +/- 0.500000 s
      Estimated background rate 1:     4288.143 near MET 651567223.168000 s
      Estimated background rate 2:     4604.680 near MET 651567312.576000 s
      Estimated total duration: 50.816 s (for data selection)
           (from MET 651567235.136000 to MET 651567285.952000)
      Estimated total fluence: -3161.883490 count
      Created GTI with 5 entries
    ------------------------------------------
     
    

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

    bat_grb_pos_cat.sh 238.836 -54.070 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 238.836 -54.070
    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: 2021 8 25 7 212.811468  -34.333119
     Obj: 2021 8 25 7 48.849366  -48.807154
    
  • the object visibility at GSFC, Greenbelt, Maryland
     
    MMT Observatory, Mt. Hopkins, Arizona
          TimeUT       Azimuth     Elevation
     Sun: 2021 8 25 7 169.996191  -47.173360
     Obj: 2021 8 25 7 39.932240  -24.203380
    
  • the object visibility at MMT, Mt. Hopkins, Arizona
     
    Hale Telescope, Palomar Mountain, California
          TimeUT       Azimuth     Elevation
     Sun: 2021 8 25 7 162.160301  -44.341039
     Obj: 2021 8 25 7 38.840053  -22.288088
    
  • the object visibility at Hale Telescope, Palomar Mt., California
     
    Mauna Kea, Hawaii
          TimeUT       Azimuth     Elevation
     Sun: 2021 8 25 7 116.387312  -30.890223
     Obj: 2021 8 25 7 24.008814  7.113961
    
  • the object visibility at Mauna Kea, Hawaii
     
    Siding Spring Obs., Australia
          TimeUT       Azimuth     Elevation
     Sun: 2021 8 25 7 108.074179  8.528405
     Obj: 2021 8 25 7 342.966536  65.596631
    
  • the object visibility at Siding Spring Obs., Australia
     
    Tokyo, Japan
          TimeUT       Azimuth     Elevation
     Sun: 2021 8 25 7 79.311927  33.530402
     Obj: 2021 8 25 7 343.739567  -1.935730
    
  • the object visibility at Tokyo, Japan
     
    William Herschel Telescope, La Palma, Canary Islands, Spain
          TimeUT       Azimuth     Elevation
     Sun: 2021 8 25 7 258.794543  1.696653
     Obj: 2021 8 25 7 358.447315  -64.623000
    
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
     
    Gemini South, Cerro Pachon, Chile
          TimeUT       Azimuth     Elevation
     Sun: 2021 8 25 7 295.631594  -53.608494
     Obj: 2021 8 25 7 27.626219  5.570833
    
  • the object visibility at Gemini South, Cerro Pachon, Chile
     
     
     
    The data/results are in /local/data/bat1/prebascript/trigger1070298/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:
    Wed Aug 25 03:14:03 EDT 2021