TDRSS lightcurve for Trigger=1191188

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Sep 23 08:48:29 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1191188,   Seg_Num: 0
GRB_RA:          226.782d {+15h 07m 08s} (J2000),
                 227.171d {+15h 08m 41s} (current),
                 225.965d {+15h 03m 52s} (1950)
GRB_DEC:         -41.334d {-41d 20' 01"} (J2000),
                 -41.424d {-41d 25' 25"} (current),
                 -41.142d {-41d 08' 30"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       14137 [cnts]    Image_Peak=315 [image_cnts]
TRIGGER_DUR:     5.504 [sec] 
TRIGGER_INDEX:   476     E_range: 25-100 keV
BKG_INTEN:       111808 [cnts]
BKG_TIME:        31576.01 SOD {08:46:16.01} UT
BKG_DUR:         48 [sec]
GRB_DATE:        20198 TJD;   254 DOY;   23/09/11
GRB_TIME:        31645.51 SOD {08:47:25.51} UT
GRB_PHI:         -53.31 [deg]
GRB_THETA:        12.86 [deg]
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.08 [sigma]
IMAGE_SIGNIF:    6.76 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  -3  +0  +0 -35  +0 
SUN_POSTN:       169.31d {+11h 17m 15s}   +4.60d {+04d 35' 47"}
SUN_DIST:         69.84 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      131.91d {+08h 47m 39s}  +23.14d {+23d 08' 32"}
MOON_DIST:       108.86 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      328.60, 14.68 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      236.09,-22.85 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 149.52,-20.20 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Sep 23 09:06:07 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1191188,   Seg_Num: 0
GRB_RA:          226.782d {+15h 07m 08s} (J2000),
                 227.171d {+15h 08m 41s} (current),
                 225.965d {+15h 03m 52s} (1950)
GRB_DEC:         -41.334d {-41d 20' 01"} (J2000),
                 -41.424d {-41d 25' 25"} (current),
                 -41.142d {-41d 08' 30"} (1950)
GRB_DATE:        20198 TJD;   254 DOY;   23/09/11
GRB_TIME:        31645.51 SOD {08:47:25.51} UT
TRIGGER_INDEX:   476
GRB_PHI:         -53.31 [deg]
GRB_THETA:        12.86 [deg]
DELTA_TIME:      -70.00 [sec]
TRIGGER_DUR:     5.504 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.08 [sigma]
IMAGE_SIGNIF:    6.76 [sigma]
LC_URL:          sw01191188000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 08:47:25 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230911 ***A*** (trigger=1191188).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 226.782, -41.334 which is 
   RA(J2000) = 15h 07m 08s
   Dec(J2000) = -41d 20' 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 ~1359 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

    Extended TDRSS lc No.2

    Extended TDRSS lc No.3

    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: 9.088 s +/- 0.286217 s
  Estimated T50 duration: 3.456 s +/- 0.905097 s
  Estimated Peak Interval: MET   716114879.74399996 +/- 0.500000 s
  Estimated background rate 1:     4870.092 near MET 716114865.024000 s
  Estimated background rate 2:     4745.217 near MET 716114934.592000 s
  Estimated total duration: 11.136 s (for data selection)
       (from MET 716114877.248000 to MET 716114888.384000)
  Estimated total fluence: 2780.355353 count
  Created GTI with 4 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 226.782 -41.334 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 226.782 -41.334
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 11 9 245.296831  -20.837472
 Obj: 2023 9 11 9 349.772536  -87.540326
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 11 9 217.111814  -46.929061
 Obj: 2023 9 11 9 60.435967  -61.672828
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 11 9 208.258450  -48.253842
 Obj: 2023 9 11 9 63.809932  -57.986581
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 11 9 138.837794  -58.565923
 Obj: 2023 9 11 9 52.173014  -21.820080
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 11 9 86.436846  -14.697604
 Obj: 2023 9 11 9 61.333450  51.644566
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 11 9 92.533555  4.399987
 Obj: 2023 9 11 9 22.271505  9.311064
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 11 9 279.665343  26.139420
 Obj: 2023 9 11 9 301.575828  -40.651728
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2023 9 11 9 279.416339  -24.434726
 Obj: 2023 9 11 9 354.893387  -18.025043
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1191188/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:
Mon Sep 11 05:06:43 EDT 2023