TDRSS lightcurve for Trigger=1192483

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Sep 23 02:45:26 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1192483,   Seg_Num: 0
GRB_RA:          261.583d {+17h 26m 20s} (J2000),
                 261.924d {+17h 27m 42s} (current),
                 260.865d {+17h 23m 28s} (1950)
GRB_DEC:         -15.900d {-15d 54' 00"} (J2000),
                 -15.919d {-15d 55' 08"} (current),
                 -15.858d {-15d 51' 27"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=7627 [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:        20205 TJD;   261 DOY;   23/09/18
GRB_TIME:        9631.97 SOD {02:40:31.97} UT
GRB_PHI:          86.42 [deg]
GRB_THETA:        16.28 [deg]
SOLN_STATUS:     0x413
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    21.31 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +7  +0  +1  -5  +0 
SUN_POSTN:       175.36d {+11h 41m 27s}   +2.01d {+02d 00' 26"}
SUN_DIST:         87.25 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      206.87d {+13h 47m 29s}  -11.44d {-11d 26' 21"}
MOON_DIST:        53.54 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:        8.72, 10.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      261.84,  7.30 [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 = 275.77,-4.60 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Sep 23 02:47:30 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1192483,   Seg_Num: 0
GRB_RA:          261.583d {+17h 26m 20s} (J2000),
                 261.924d {+17h 27m 42s} (current),
                 260.865d {+17h 23m 28s} (1950)
GRB_DEC:         -15.900d {-15d 54' 00"} (J2000),
                 -15.919d {-15d 55' 08"} (current),
                 -15.858d {-15d 51' 27"} (1950)
GRB_DATE:        20205 TJD;   261 DOY;   23/09/18
GRB_TIME:        9631.97 SOD {02:40:31.97} UT
TRIGGER_INDEX:   20000
GRB_PHI:          86.42 [deg]
GRB_THETA:        16.28 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x413
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    21.31 [sigma]
LC_URL:          sw01192483000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 02:40:31 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230918 ***A*** (trigger=1192483).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 261.583, -15.900 which is 
   RA(J2000) = 17h 26m 20s
   Dec(J2000) = -15d 54' 00"
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 ~1273 counts/sec (15-350 keV), at ~3 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:     4703.050 near MET 716697699.904000 s
  Estimated background rate 2:     4859.297 near MET 716697804.864000 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 261.583 -15.900 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 261.583 -15.900
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 18 2 122.878437  -31.201935
 Obj: 2023 9 18 2 48.690871  19.405559
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 18 2 97.029360  -7.480481
 Obj: 2023 9 18 2 17.142718  40.651293
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 18 2 93.910311  -2.300077
 Obj: 2023 9 18 2 9.407604  40.188306
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 18 2 79.050037  33.007129
 Obj: 2023 9 18 2 317.211554  42.907941
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 18 2 180.043540  56.676238
 Obj: 2023 9 18 2 282.045936  10.978123
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 18 2 330.794807  54.067498
 Obj: 2023 9 18 2 276.217811  -19.697964
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 18 2 204.285265  -56.811160
 Obj: 2023 9 18 2 83.227409  -21.783709
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 18 2 61.051988  -42.699507
 Obj: 2023 9 18 2 93.949958  39.322633
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1192483/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 Sep 17 22:50:02 EDT 2023