TDRSS lightcurve for Trigger=1192745

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Sep 23 22:56:53 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1192745,   Seg_Num: 0
GRB_RA:          245.038d {+16h 20m 09s} (J2000),
                 245.378d {+16h 21m 31s} (current),
                 244.323d {+16h 17m 18s} (1950)
GRB_DEC:         -16.451d {-16d 27' 01"} (J2000),
                 -16.506d {-16d 30' 20"} (current),
                 -16.331d {-16d 19' 52"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=6919 [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:        82431.91 SOD {22:53:51.91} UT
GRB_PHI:         -92.69 [deg]
GRB_THETA:        16.35 [deg]
SOLN_STATUS:     0x10000413
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    19.19 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +6  +0  +0 -46  +0 
SUN_POSTN:       183.30d {+12h 13m 12s}   -1.43d {-01d 25' 44"}
SUN_DIST:         62.88 [deg]   Sun_angle= -4.1 [hr] (East of Sun)
MOON_POSTN:      332.80d {+22h 11m 12s}  -15.76d {-15d 45' 51"}
MOON_DIST:        83.18 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      358.46, 23.22 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      246.03,  4.94 [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 = 277.05,1.43 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Sep 23 23:00:31 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1192745,   Seg_Num: 0
GRB_RA:          245.038d {+16h 20m 09s} (J2000),
                 245.378d {+16h 21m 31s} (current),
                 244.323d {+16h 17m 18s} (1950)
GRB_DEC:         -16.451d {-16d 27' 01"} (J2000),
                 -16.506d {-16d 30' 20"} (current),
                 -16.331d {-16d 19' 52"} (1950)
GRB_DATE:        20213 TJD;   269 DOY;   23/09/26
GRB_TIME:        82431.91 SOD {22:53:51.91} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -92.69 [deg]
GRB_THETA:        16.35 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x413
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    19.19 [sigma]
LC_URL:          sw01192745000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 22:53:51 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230926 ***A*** (trigger=1192745).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 245.038, -16.451 which is 
   RA(J2000) = 16h 20m 09s
   Dec(J2000) = -16d 27' 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 ~1093 counts/sec (15-350 keV), at ~7 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 background rate 1:     4684.196 near MET 717461712.192000 s
  Estimated background rate 2:     4513.519 near MET 717461817.152000 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 245.038 -16.451 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 245.038 -16.451
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 23 88.765037  -0.788925
 Obj: 2023 9 26 23 30.586749  28.696659
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 23 69.062619  27.672519
 Obj: 2023 9 26 23 351.977996  41.406448
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 23 63.822648  31.634523
 Obj: 2023 9 26 23 344.873574  38.759092
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 23 28.643451  66.035619
 Obj: 2023 9 26 23 302.445333  28.199189
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 23 243.316564  38.654818
 Obj: 2023 9 26 23 292.581055  -4.775678
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 23 288.708381  22.766779
 Obj: 2023 9 26 23 265.730490  -36.228448
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 23 126.949080  -49.642985
 Obj: 2023 9 26 23 73.951606  -5.131021
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 26 23 85.871463  -4.232675
 Obj: 2023 9 26 23 106.564756  56.333038
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1192745/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 19:03:22 EDT 2023