TDRSS lightcurve for Trigger=1186296

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 20 Aug 23 19:49:01 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1186296,   Seg_Num: 0
GRB_RA:          245.306d {+16h 21m 13s} (J2000),
                 245.646d {+16h 22m 35s} (current),
                 244.586d {+16h 18m 21s} (1950)
GRB_DEC:         -17.434d {-17d 26' 02"} (J2000),
                 -17.489d {-17d 29' 19"} (current),
                 -17.316d {-17d 18' 58"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=9222 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
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:        71016.13 SOD {19:43:36.13} UT
GRB_PHI:         126.98 [deg]
GRB_THETA:         0.04 [deg]
SOLN_STATUS:     0x1000041D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    22.48 [sigma]
MERIT_PARAMS:     +0  +0 +100  +6  +1  +8  +0  +0 +15  +0 
SUN_POSTN:       149.73d {+09h 58m 56s}  +12.32d {+12d 19' 28"}
SUN_DIST:         99.21 [deg]   Sun_angle= -6.4 [hr] (East of Sun)
MOON_POSTN:      195.16d {+13h 00m 39s}   -5.50d {-05d 29' 54"}
MOON_DIST:        50.74 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      357.82, 22.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      246.45,  4.01 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This matches a source in the on-board catalog: Num=26295=(null) (probably an AT_Slot).  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is not a GRB.  
COMMENTS:        This is an interesting source.

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 20 Aug 23 20:01:41 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1186296,   Seg_Num: 0
GRB_RA:          245.306d {+16h 21m 13s} (J2000),
                 245.646d {+16h 22m 35s} (current),
                 244.586d {+16h 18m 21s} (1950)
GRB_DEC:         -17.434d {-17d 26' 02"} (J2000),
                 -17.489d {-17d 29' 19"} (current),
                 -17.316d {-17d 18' 58"} (1950)
GRB_DATE:        20176 TJD;   232 DOY;   23/08/20
GRB_TIME:        71016.13 SOD {19:43:36.13} UT
TRIGGER_INDEX:   20000
GRB_PHI:         126.98 [deg]
GRB_THETA:         0.04 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x41D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    22.48 [sigma]
LC_URL:          sw01186296000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 19:43:36 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230820 ***A*** (trigger=1186296).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 245.306, -17.434 which is 
   RA(J2000) = 16h 21m 13s
   Dec(J2000) = -17d 26' 02"
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 ~960 counts/sec (15-350 keV), at ~6 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 background rate 1:     5102.388 near MET 714253500.288000 s
  Estimated background rate 2:     4980.818 near MET 714253605.248000 s
  Estimated total fluence: 0.000000 count
  Created GTI with 2 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 245.306 -17.434 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 245.306 -17.434
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 20 65.786412  44.444155
 Obj: 2023 8 20 20 307.137554  14.158746
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 20 22.014346  69.345658
 Obj: 2023 8 20 20 285.931129  -7.581385
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 20 4.864350  68.894805
 Obj: 2023 8 20 20 282.645786  -12.880434
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 20 276.299895  53.898625
 Obj: 2023 8 20 20 275.150594  -45.302539
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 20 260.562907  -8.316227
 Obj: 2023 8 20 20 10.290180  -40.624740
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 20 248.997902  -8.107703
 Obj: 2023 8 20 20 121.101112  -62.171387
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 20 105.987643  -3.328471
 Obj: 2023 8 20 20 6.416674  43.492656
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 20 20 125.567364  27.351960
 Obj: 2023 8 20 20 265.053927  44.415664
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1186296/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 16:02:44 EDT 2023