TDRSS lightcurve for Trigger=1042398

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 11 Apr 21 15:06:04 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1042398,   Seg_Num: 0
GRB_RA:          296.559d {+19h 46m 14s} (J2000),
                 296.919d {+19h 47m 40s} (current),
                 295.713d {+19h 42m 51s} (1950)
GRB_DEC:         -39.373d {-39d 22' 21"} (J2000),
                 -39.320d {-39d 19' 09"} (current),
                 -39.495d {-39d 29' 43"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1092 [cnts]    Image_Peak=97 [image_cnts]
TRIGGER_DUR:     0.256 [sec] 
TRIGGER_INDEX:   120     E_range: 15-50 keV
BKG_INTEN:       21748 [cnts]
BKG_TIME:        54341.17 SOD {15:05:41.17} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19315 TJD;   101 DOY;   21/04/11
GRB_TIME:        54351.47 SOD {15:05:51.47} UT
GRB_PHI:          84.03 [deg]
GRB_THETA:        14.73 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.69 [sigma]
IMAGE_SIGNIF:    8.09 [sigma]
MERIT_PARAMS:     +1  +0  +0  -2  +1  -2  +0  +0  +0  +0 
SUN_POSTN:        20.29d {+01h 21m 11s}   +8.55d {+08d 32' 59"}
SUN_DIST:         90.34 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:       16.81d {+01h 07m 14s}   +2.67d {+02d 39' 56"}
MOON_DIST:        83.90 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:        0.29,-26.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      291.30,-17.88 [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 = 195.65,5.43 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 11 Apr 21 15:23:01 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1042398,   Seg_Num: 0
GRB_RA:          296.559d {+19h 46m 14s} (J2000),
                 296.919d {+19h 47m 40s} (current),
                 295.713d {+19h 42m 51s} (1950)
GRB_DEC:         -39.373d {-39d 22' 21"} (J2000),
                 -39.320d {-39d 19' 09"} (current),
                 -39.495d {-39d 29' 43"} (1950)
GRB_DATE:        19315 TJD;   101 DOY;   21/04/11
GRB_TIME:        54351.47 SOD {15:05:51.47} UT
TRIGGER_INDEX:   120
GRB_PHI:          84.03 [deg]
GRB_THETA:        14.73 [deg]
DELTA_TIME:      -70.00 [sec]
TRIGGER_DUR:     0.256 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.69 [sigma]
IMAGE_SIGNIF:    8.09 [sigma]
LC_URL:          sw01042398000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 15:05:51 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 210411 ***A*** (trigger=1042398).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 296.559, -39.373 which is 
   RA(J2000) = 19h 46m 14s
   Dec(J2000) = -39d 22' 21"
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 ~5570 counts/sec (15-350 keV), at ~4 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: 15.104 s +/- 0.527757 s
  Estimated T50 duration: 7.424 s +/- 0.202386 s
  Estimated Peak Interval: MET   639846382.72000003 +/- 0.500000 s
  Estimated background rate 1:     5129.852 near MET 639846365.760000 s
  Estimated background rate 2:     5366.678 near MET 639846491.840000 s
  Estimated total duration: 42.24 s (for data selection)
       (from MET 639846377.920000 to MET 639846420.160000)
  Estimated total fluence: 24008.346741 count
  Created GTI with 16 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 296.559 -39.373 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 296.559 -39.373
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 4 11 15 307.470135  47.780921
 Obj: 2021 4 11 15 36.814701  -1.094056
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2021 4 11 15 275.008201  24.300499
 Obj: 2021 4 11 15 13.508709  17.273978
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2021 4 11 15 272.324129  19.158101
 Obj: 2021 4 11 15 8.679317  16.610130
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2021 4 11 15 254.176567  -16.651461
 Obj: 2021 4 11 15 336.439549  25.342641
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2021 4 11 15 328.536383  -64.115853
 Obj: 2021 4 11 15 302.770645  23.936049
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2021 4 11 15 175.237650  -46.954453
 Obj: 2021 4 11 15 300.425868  -27.929899
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2021 4 11 15 56.056361  57.999919
 Obj: 2021 4 11 15 59.449751  -32.309945
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2021 4 11 15 217.737673  43.382652
 Obj: 2021 4 11 15 62.802091  43.371311
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1042398/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:
Sun Apr 11 11:23:23 EDT 2021