TDRSS lightcurve for Trigger=1187463

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Aug 23 19:33:03 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1187463,   Seg_Num: 0
GRB_RA:           83.012d {+05h 32m 03s} (J2000),
                  83.610d {+05h 34m 26s} (current),
                  81.748d {+05h 27m 00s} (1950)
GRB_DEC:         +66.125d {+66d 07' 30"} (J2000),
                 +66.140d {+66d 08' 25"} (current),
                 +66.088d {+66d 05' 17"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4356 [cnts]    Image_Peak=470 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       16509 [cnts]
BKG_TIME:        70352.10 SOD {19:32:32.10} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20182 TJD;   238 DOY;   23/08/26
GRB_TIME:        70367.07 SOD {19:32:47.07} UT
GRB_PHI:          46.25 [deg]
GRB_THETA:        15.66 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     45.90 [sigma]
IMAGE_SIGNIF:    15.04 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +4  +0  +0 -28  +0 
SUN_POSTN:       155.24d {+10h 20m 58s}  +10.29d {+10d 17' 21"}
SUN_DIST:         73.22 [deg]   Sun_angle= 4.8 [hr] (West of Sun)
MOON_POSTN:      274.30d {+18h 17m 11s}  -28.16d {-28d 09' 52"}
MOON_DIST:       141.45 [deg]
MOON_ILLUM:      75 [%]
GAL_COORDS:      146.41, 17.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       86.15, 42.78 [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 = 218.84,1.52 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(3.0<100sec) coincident with the FERMI_GBM event (trignum=714771169).

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Aug 23 21:45:56 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1187463,   Seg_Num: 0
GRB_RA:           83.012d {+05h 32m 03s} (J2000),
                  83.610d {+05h 34m 26s} (current),
                  81.748d {+05h 27m 00s} (1950)
GRB_DEC:         +66.125d {+66d 07' 30"} (J2000),
                 +66.140d {+66d 08' 25"} (current),
                 +66.088d {+66d 05' 17"} (1950)
GRB_DATE:        20182 TJD;   238 DOY;   23/08/26
GRB_TIME:        70367.07 SOD {19:32:47.07} UT
TRIGGER_INDEX:   146
GRB_PHI:          46.25 [deg]
GRB_THETA:        15.66 [deg]
DELTA_TIME:      1799.00 [sec]
TRIGGER_DUR:     


 GCN template for BAT paragraph 


  •  Click here! 

    At 19:32:47 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230826 ***A*** (trigger=1187463).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 83.012, +66.125 which is 
   RA(J2000) = 05h 32m 03s
   Dec(J2000) = +66d 07' 30"
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 ~4176 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 
    






    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: 6.784 s +/- 0.64 s
  Estimated T50 duration: 3.2 s +/- 0.128 s
  Estimated Peak Interval: MET   714771201.59999990 +/- 0.500000 s
  Estimated background rate 1:     3990.681 near MET 714771183.360000 s
  Estimated background rate 2:     6315.625 near MET 714771206.080000 s
  Estimated total duration: 13.44 s (for data selection)
       (from MET 714771192.320000 to MET 714771205.760000)
  Estimated total fluence: 8155.198203 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 83.012 66.125 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 83.012 66.125
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 26 21 76.587120  31.754385
 Obj: 2023 8 26 21 160.108303  22.196774
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 26 21 50.125461  59.682287
 Obj: 2023 8 26 21 153.152214  26.787294
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 26 21 38.322140  62.016821
 Obj: 2023 8 26 21 151.967721  30.592806
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 26 21 291.725901  67.237901
 Obj: 2023 8 26 21 158.063916  33.574680
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 26 21 254.355123  5.606193
 Obj: 2023 8 26 21 182.113038  -7.544552
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 26 21 259.558969  2.901016
 Obj: 2023 8 26 21 195.481917  55.730355
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 26 21 112.460167  -17.176405
 Obj: 2023 8 26 21 183.185581  5.048659
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 26 21 113.361468  17.095787
 Obj: 2023 8 26 21 156.013191  -45.078307
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1187463/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:
Sat Aug 26 17:46:46 EDT 2023