TDRSS lightcurve for Trigger=1192740

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Sep 23 22:34:27 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1192740,   Seg_Num: 0
GRB_RA:          245.078d {+16h 20m 19s} (J2000),
                 245.418d {+16h 21m 40s} (current),
                 244.365d {+16h 17m 28s} (1950)
GRB_DEC:         -16.234d {-16d 14' 01"} (J2000),
                 -16.289d {-16d 17' 21"} (current),
                 -16.115d {-16d 06' 53"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1149 [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:        20213 TJD;   269 DOY;   23/09/26
GRB_TIME:        81055.91 SOD {22:30:55.91} UT
GRB_PHI:         -18.01 [deg]
GRB_THETA:        51.98 [deg]
SOLN_STATUS:     0x413
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.57 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -1  +0  +0 -46  +0 
SUN_POSTN:       183.29d {+12h 13m 09s}   -1.42d {-01d 25' 22"}
SUN_DIST:         62.90 [deg]   Sun_angle= -4.1 [hr] (East of Sun)
MOON_POSTN:      332.58d {+22h 10m 19s}  -15.86d {-15d 51' 27"}
MOON_DIST:        82.97 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      358.66, 23.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      246.03,  5.16 [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 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 = 196.51,-20.25 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Sep 23 22:36:32 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1192740,   Seg_Num: 0
GRB_RA:          245.078d {+16h 20m 19s} (J2000),
                 245.418d {+16h 21m 40s} (current),
                 244.365d {+16h 17m 28s} (1950)
GRB_DEC:         -16.234d {-16d 14' 01"} (J2000),
                 -16.289d {-16d 17' 21"} (current),
                 -16.115d {-16d 06' 53"} (1950)
GRB_DATE:        20213 TJD;   269 DOY;   23/09/26
GRB_TIME:        81055.91 SOD {22:30:55.91} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -18.01 [deg]
GRB_THETA:        51.98 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x413
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.57 [sigma]
LC_URL:          sw01192740000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 22:30:55 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230926 ***A*** (trigger=1192740).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 245.078, -16.234 which is 
   RA(J2000) = 16h 20m 19s
   Dec(J2000) = -16d 14' 01"
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 ~1201 counts/sec (15-350 keV), at ~147 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

    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: 16.384 s +/- 4.096 s
  Estimated T50 duration: 8.192 s +/- 4.096 s
  Estimated Peak Interval: MET   717460394.04799998 +/- 0.500000 s
  Estimated background rate 1:      983.125 near MET 717460328.000000 s
  Estimated background rate 2:     4635.544 near MET 717460441.152000 s
  Estimated total duration: 16.384 s (for data selection)
       (from MET 717460392.000000 to MET 717460408.384000)
  Estimated total fluence: 21079.668188 count
  Created GTI with 3 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 245.078 -16.234 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 245.078 -16.234
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 9 26 22 79.194076  10.804445
 Obj: 2023 9 26 22 14.597924  33.423447
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 22 57.354109  39.090421
 Obj: 2023 9 26 22 333.743843  37.808214
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 22 50.421693  42.188978
 Obj: 2023 9 26 22 327.923275  33.892004
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 22 349.676044  68.413142
 Obj: 2023 9 26 22 294.353537  15.813481
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 22 254.123739  26.691931
 Obj: 2023 9 26 22 301.361912  -16.394009
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 22 279.277834  10.770427
 Obj: 2023 9 26 22 255.031157  -48.366879
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 22 113.330944  -38.239558
 Obj: 2023 9 26 22 66.760593  7.429713
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 22 93.492982  8.698943
 Obj: 2023 9 26 22 125.456733  67.963729
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1192740/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 Sep 26 18:39:03 EDT 2023