TDRSS lightcurve for Trigger=1186032

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 Aug 23 23:27:46 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1186032,   Seg_Num: 0
GRB_RA:          285.883d {+19h 03m 32s} (J2000),
                 286.076d {+19h 04m 18s} (current),
                 285.474d {+19h 01m 54s} (1950)
GRB_DEC:         +40.876d {+40d 52' 35"} (J2000),
                 +40.913d {+40d 54' 45"} (current),
                 +40.801d {+40d 48' 04"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1498 [cnts]    Image_Peak=115 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   47     E_range: 25-100 keV
BKG_INTEN:       18766 [cnts]
BKG_TIME:        84440.14 SOD {23:27:20.14} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20174 TJD;   230 DOY;   23/08/18
GRB_TIME:        84454.35 SOD {23:27:34.35} UT
GRB_PHI:         -153.67 [deg]
GRB_THETA:        46.37 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.63 [sigma]
IMAGE_SIGNIF:    9.15 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  +0  +0  +0 +39  +0 
SUN_POSTN:       148.02d {+09h 52m 05s}  +12.93d {+12d 55' 47"}
SUN_DIST:        113.66 [deg]   Sun_angle= -9.2 [hr] (East of Sun)
MOON_POSTN:      175.56d {+11h 42m 14s}   +4.90d {+04d 54' 05"}
MOON_DIST:       102.00 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:       71.43, 15.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      296.95, 62.84 [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 = 309.85,20.54 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 Aug 23 23:46:46 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1186032,   Seg_Num: 0
GRB_RA:          285.883d {+19h 03m 32s} (J2000),
                 286.076d {+19h 04m 18s} (current),
                 285.474d {+19h 01m 54s} (1950)
GRB_DEC:         +40.876d {+40d 52' 35"} (J2000),
                 +40.913d {+40d 54' 45"} (current),
                 +40.801d {+40d 48' 04"} (1950)
GRB_DATE:        20174 TJD;   230 DOY;   23/08/18
GRB_TIME:        84454.35 SOD {23:27:34.35} UT
TRIGGER_INDEX:   47
GRB_PHI:         -153.67 [deg]
GRB_THETA:        46.37 [deg]
DELTA_TIME:      19.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.63 [sigma]
IMAGE_SIGNIF:    9.15 [sigma]
LC_URL:          sw01186032000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 23:27:34 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230818 ***A*** (trigger=1186032).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 285.883, +40.876 which is 
   RA(J2000) = 19h 03m 32s
   Dec(J2000) = +40d 52' 35"
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 ~6296 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

    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: 102.656 s +/- 2.89772 s
  Estimated T50 duration: 60.544 s +/- 2.89772 s
  Estimated Peak Interval: MET   714094088.31999993 +/- 0.500000 s
  Estimated background rate 1:     4653.033 near MET 714094074.368000 s
  Estimated background rate 2:     4655.518 near MET 714094241.600000 s
  Estimated total duration: 124.544 s (for data selection)
       (from MET 714094086.336000 to MET 714094210.880000)
  Estimated total fluence: 19616.025600 count
  Created GTI with 12 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 285.883 40.876 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 285.883 40.876
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: 2023 8 18 23 98.090525  10.625356
 Obj: 2023 8 18 23 250.235825  51.103318
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 18 23 81.201045  38.331205
 Obj: 2023 8 18 23 235.101429  23.265605
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 18 23 75.711493  42.944358
 Obj: 2023 8 18 23 233.595145  20.134280
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 18 23 49.550648  79.622585
 Obj: 2023 8 18 23 216.558507  -13.603502
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 18 23 233.330498  26.558636
 Obj: 2023 8 18 23 156.973936  -79.425954
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 18 23 273.698281  28.587006
 Obj: 2023 8 18 23 163.124521  -12.029677
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 18 23 136.703451  -36.744447
 Obj: 2023 8 18 23 154.957431  76.340305
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 18 23 99.974871  -8.704551
 Obj: 2023 8 18 23 212.915576  7.222890
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1186032/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 Aug 18 19:47:22 EDT 2023