TDRSS lightcurve for Trigger=1187142

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 25 Aug 23 09:06:13 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1187142,   Seg_Num: 0
GRB_RA:          261.942d {+17h 27m 46s} (J2000),
                 262.283d {+17h 29m 08s} (current),
                 261.221d {+17h 24m 53s} (1950)
GRB_DEC:         -16.214d {-16d 12' 49"} (J2000),
                 -16.232d {-16d 13' 54"} (current),
                 -16.173d {-16d 10' 22"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=50010 [image_cnts]
TRIGGER_DUR:     144.000 [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:        20181 TJD;   237 DOY;   23/08/25
GRB_TIME:        32616.11 SOD {09:03:36.11} UT
GRB_PHI:         -136.41 [deg]
GRB_THETA:        21.82 [deg]
SOLN_STATUS:     0x1000001D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    26.75 [sigma]
MERIT_PARAMS:     +0  +0 +100  +7  +1  +9  -5  +1 +34  +0 
SUN_POSTN:       153.93d {+10h 15m 43s}  +10.79d {+10d 47' 11"}
SUN_DIST:        110.45 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      251.95d {+16h 47m 48s}  -26.32d {-26d 18' 54"}
MOON_DIST:        13.93 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:        8.64, 10.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      262.21,  7.01 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
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=26959=(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.  
COMMENTS:        This trigger occurred at longitude,latitude = 117.05,20.58 [deg].  
COMMENTS:

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 25 Aug 23 09:20:43 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1187142,   Seg_Num: 0
GRB_RA:          261.942d {+17h 27m 46s} (J2000),
                 262.283d {+17h 29m 08s} (current),
                 261.221d {+17h 24m 53s} (1950)
GRB_DEC:         -16.214d {-16d 12' 49"} (J2000),
                 -16.232d {-16d 13' 54"} (current),
                 -16.173d {-16d 10' 22"} (1950)
GRB_DATE:        20181 TJD;   237 DOY;   23/08/25
GRB_TIME:        32616.11 SOD {09:03:36.11} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -136.41 [deg]
GRB_THETA:        21.82 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     144.000 [sec] 
SOLN_STATUS:     0x1D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    26.75 [sigma]
LC_URL:          sw01187142000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 09:03:36 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230825 ***A*** (trigger=1187142).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 261.942, -16.214 which is 
   RA(J2000) = 17h 27m 46s
   Dec(J2000) = -16d 12' 49"
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 ~1718 counts/sec (15-350 keV), at ~0 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 T90 duration: 196.928 s +/- 143.908 s
  Estimated T50 duration: 196.928 s +/- 157.583 s
  Estimated Peak Interval: MET   714647219.58399999 +/- 0.500000 s
  Estimated background rate 1:     7558.958 near MET 714647026.400000 s
  Estimated background rate 2:     6669.678 near MET 714647229.824000 s
  Estimated total duration: 196.928 s (for data selection)
       (from MET 714647028.800000 to MET 714647225.728000)
  Estimated total fluence: -23187.126651 count
  Created GTI with 29 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 261.942 -16.214 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 261.942 -16.214
SWIFT J1727.8-1613 34166 261.937 -16.212 0.005190741135289348

    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 25 9 239.709899  -17.323684
 Obj: 2023 8 25 9 102.107617  -40.012715
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 9 211.259492  -42.150115
 Obj: 2023 8 25 9 78.400529  -12.391061
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 9 203.220823  -42.979800
 Obj: 2023 8 25 9 75.671652  -7.848003
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 9 143.460697  -52.783613
 Obj: 2023 8 25 9 57.371699  28.922703
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 9 92.696802  -16.671850
 Obj: 2023 8 25 9 199.118403  74.170497
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 9 96.956254  8.977030
 Obj: 2023 8 25 9 333.934323  35.197164
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 9 272.823170  27.903816
 Obj: 2023 8 25 9 211.223302  -75.612831
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 9 274.178369  -28.710143
 Obj: 2023 8 25 9 49.592278  -26.188872
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1187142/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:
Fri Aug 25 05:21:02 EDT 2023