TDRSS lightcurve for Trigger=1069169

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 18 Aug 21 01:02:22 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1069169,   Seg_Num: 0
GRB_RA:          149.131d {+09h 56m 32s} (J2000),
                 148.180d {+09h 52m 43s} (current),
                 151.055d {+10h 04m 13s} (1950)
GRB_DEC:         -87.031d {-87d 01' 52"} (J2000),
                 -87.134d {-87d 08' 03"} (current),
                 -86.790d {-86d 47' 23"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1425 [cnts]    Image_Peak=128 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10427     E_range: 50-350 keV
BKG_INTEN:       17319 [cnts]
BKG_TIME:        3716.43 SOD {01:01:56.43} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19444 TJD;   230 DOY;   21/08/18
GRB_TIME:        3727.95 SOD {01:02:07.95} UT
GRB_PHI:           9.38 [deg]
GRB_THETA:        17.60 [deg]
SOLN_STATUS:     0x103
RATE_SIGNIF:     96.47 [sigma]
IMAGE_SIGNIF:    9.11 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +3  +0  +0  +0 +17  +0 
SUN_POSTN:       147.60d {+09h 50m 24s}  +13.08d {+13d 04' 33"}
SUN_DIST:        100.21 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      266.83d {+17h 47m 19s}  -25.18d {-25d 11' 03"}
MOON_DIST:        66.21 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      300.67,-24.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      263.20,-67.94 [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 matches a source in the ground catalog: IGRJ10043-8702,   delta=0.100 [deg].  
COMMENTS:        This is not a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 156.11,-13.69 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 18 Aug 21 01:25:22 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1069169,   Seg_Num: 0
GRB_RA:          149.131d {+09h 56m 32s} (J2000),
                 148.180d {+09h 52m 43s} (current),
                 151.055d {+10h 04m 13s} (1950)
GRB_DEC:         -87.031d {-87d 01' 52"} (J2000),
                 -87.134d {-87d 08' 03"} (current),
                 -86.790d {-86d 47' 23"} (1950)
GRB_DATE:        19444 TJD;   230 DOY;   21/08/18
GRB_TIME:        3728.19 SOD {01:02:08.19} UT
TRIGGER_INDEX:   10427
GRB_PHI:           9.38 [deg]
GRB_THETA:        17.60 [deg]
DELTA_TIME:      -55.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x103
RATE_SIGNIF:     96.47 [sigma]
IMAGE_SIGNIF:    9.11 [sigma]
LC_URL:          sw01069169000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 01:02:08 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 210818 ***A*** (trigger=1069169).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 149.131, -87.031 which is 
   RA(J2000) = 09h 56m 32s
   Dec(J2000) = -87d 01' 52"
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 ~28585 counts/sec (15-350 keV), at ~1 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: 65.024 s +/- 4.098 s
  Estimated T50 duration: 28.416 s +/- 1.04184 s
  Estimated Peak Interval: MET   650941357.63199997 +/- 0.500000 s
  Estimated background rate 1:     4796.666 near MET 650941343.168000 s
  Estimated background rate 2:     4937.424 near MET 650941508.352000 s
  Estimated total duration: 120.448 s (for data selection)
       (from MET 650941355.136000 to MET 650941475.584000)
  Estimated total fluence: 469464.131081 count
  Created GTI with 79 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 149.131 -87.031 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 149.131 -87.031
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 18 1 117.370626  -11.396195
 Obj: 2021 8 18 1 3.372074  -40.242505
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2021 8 18 1 97.490927  12.970004
 Obj: 2021 8 18 1 3.320894  -31.278941
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2021 8 18 1 93.949517  18.156679
 Obj: 2021 8 18 1 3.303495  -32.650697
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2021 8 18 1 85.488675  52.942057
 Obj: 2021 8 18 1 1.828887  -17.586808
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2021 8 18 1 203.320374  42.563985
 Obj: 2021 8 18 1 358.932943  33.977765
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2021 8 18 1 296.301698  52.532387
 Obj: 2021 8 18 1 358.080723  -32.059721
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2021 8 18 1 173.651870  -47.980431
 Obj: 2021 8 18 1 0.289252  -31.639163
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2021 8 18 1 85.175152  -34.536222
 Obj: 2021 8 18 1 2.774368  28.757492
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1069169/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 Aug 17 21:26:04 EDT 2021