TDRSS lightcurve for Trigger=1186291

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 20 Aug 23 19:13:16 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1186291,   Seg_Num: 0
GRB_RA:           84.321d {+05h 37m 17s} (J2000),
                  84.679d {+05h 38m 43s} (current),
                  83.563d {+05h 34m 15s} (1950)
GRB_DEC:         +22.988d {+22d 59' 15"} (J2000),
                 +23.000d {+23d 00' 01"} (current),
                 +22.958d {+22d 57' 30"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=13688 [image_cnts]
TRIGGER_DUR:     208.000 [sec]   (=3.5 [min])
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        20176 TJD;   232 DOY;   23/08/20
GRB_TIME:        68976.13 SOD {19:09:36.13} UT
GRB_PHI:         144.68 [deg]
GRB_THETA:        12.40 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    20.05 [sigma]
MERIT_PARAMS:     +1  +0  +0  +8  +1  +6  +0  +1 -45  +0 
SUN_POSTN:       149.71d {+09h 58m 51s}  +12.33d {+12d 19' 57"}
SUN_DIST:         62.42 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:      194.90d {+12h 59m 35s}   -5.36d {-05d 21' 31"}
MOON_DIST:       110.68 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      184.07, -4.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       84.77, -0.35 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
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 = 226.65,-13.95 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 20 Aug 23 19:28:10 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1186291,   Seg_Num: 0
GRB_RA:           84.321d {+05h 37m 17s} (J2000),
                  84.679d {+05h 38m 43s} (current),
                  83.563d {+05h 34m 15s} (1950)
GRB_DEC:         +22.988d {+22d 59' 15"} (J2000),
                 +23.000d {+23d 00' 01"} (current),
                 +22.958d {+22d 57' 30"} (1950)
GRB_DATE:        20176 TJD;   232 DOY;   23/08/20
GRB_TIME:        68976.13 SOD {19:09:36.13} UT
TRIGGER_INDEX:   20000
GRB_PHI:         144.68 [deg]
GRB_THETA:        12.40 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     208.000 [sec]   (=3.5 [min])
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    20.05 [sigma]
LC_URL:          sw01186291000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 19:09:36 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230820 ***A*** (trigger=1186291).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 84.321, +22.988 which is 
   RA(J2000) = 05h 37m 17s
   Dec(J2000) = +22d 59' 15"
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 ~1734 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

    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: 141.248 s +/- 4.10848 s
  Estimated T50 duration: 122.496 s +/- 2.89772 s
  Estimated Peak Interval: MET   714251546.81599998 +/- 0.500000 s
  Estimated background rate 1:     5216.647 near MET 714251392.320000 s
  Estimated background rate 2:     5233.374 near MET 714251573.440000 s
  Estimated total duration: 152.32 s (for data selection)
       (from MET 714251400.640000 to MET 714251552.960000)
  Estimated total fluence: 10602.030015 count
  Created GTI with 7 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 84.321 22.988 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 84.321 22.988
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 20 19 48.972627  54.297540
 Obj: 2023 8 20 19 109.280714  12.875993
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 19 339.409918  69.527079
 Obj: 2023 8 20 19 95.488654  38.480371
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 19 327.042741  65.752491
 Obj: 2023 8 20 19 91.071482  43.614806
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 19 270.293147  39.810873
 Obj: 2023 8 20 19 106.786576  77.293061
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 19 268.040015  -21.069240
 Obj: 2023 8 20 19 221.983556  22.261057
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 19 239.161141  -19.228889
 Obj: 2023 8 20 19 266.116467  37.810910
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 19 98.906885  9.516327
 Obj: 2023 8 20 19 148.369486  -31.128728
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 19 138.676631  36.971113
 Obj: 2023 8 20 19 106.773248  -17.720906
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1186291/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 Aug 20 15:28:42 EDT 2023