TDRSS lightcurve for Trigger=1187207

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 25 Aug 23 20:52:04 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1187207,   Seg_Num: 0
GRB_RA:          261.942d {+17h 27m 46s} (J2000),
                 262.283d {+17h 29m 08s} (current),
                 261.222d {+17h 24m 53s} (1950)
GRB_DEC:         -16.217d {-16d 13' 00"} (J2000),
                 -16.235d {-16d 14' 05"} (current),
                 -16.176d {-16d 10' 33"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=55543 [image_cnts]
TRIGGER_DUR:     160.000 [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:        73640.10 SOD {20:27:20.10} UT
GRB_PHI:         -146.13 [deg]
GRB_THETA:        30.77 [deg]
SOLN_STATUS:     0x1000001D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    26.41 [sigma]
MERIT_PARAMS:     +0  +0 +100  +7  +1  +9  -5  +1 +33  +0 
SUN_POSTN:       154.38d {+10h 17m 30s}  +10.62d {+10d 37' 02"}
SUN_DIST:        109.98 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      259.37d {+17h 17m 30s}  -27.34d {-27d 20' 20"}
MOON_DIST:        11.43 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:        8.64, 10.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      262.21,  7.00 [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 matches a source in the on-board catalog: Num=27203=(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.

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 25 Aug 23 20:57:15 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1187207,   Seg_Num: 0
GRB_RA:          261.942d {+17h 27m 46s} (J2000),
                 262.283d {+17h 29m 08s} (current),
                 261.222d {+17h 24m 53s} (1950)
GRB_DEC:         -16.217d {-16d 13' 00"} (J2000),
                 -16.235d {-16d 14' 05"} (current),
                 -16.176d {-16d 10' 33"} (1950)
GRB_DATE:        20181 TJD;   237 DOY;   23/08/25
GRB_TIME:        73640.10 SOD {20:27:20.10} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -146.13 [deg]
GRB_THETA:        30.77 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     160.000 [sec] 
SOLN_STATUS:     0x1D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    26.41 [sigma]
LC_URL:          sw01187207000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 20:27:20 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 230825 ***A*** (trigger=1187207).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 261.942, -16.217 which is 
   RA(J2000) = 17h 27m 46s
   Dec(J2000) = -16d 13' 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 ~1763 counts/sec (15-350 keV), at ~12 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

    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: 198.528 s +/- 142.884 s
  Estimated T50 duration: 198.528 s +/- 163.282 s
  Estimated Peak Interval: MET   714688219.00799990 +/- 0.500000 s
  Estimated background rate 1:     6620.000 near MET 714688049.600000 s
  Estimated background rate 2:     6028.320 near MET 714688253.824000 s
  Estimated total duration: 198.528 s (for data selection)
       (from MET 714688051.200000 to MET 714688249.728000)
  Estimated total fluence: -27468.004654 count
  Created GTI with 38 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 -16.217 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 -16.217
SWIFT J1727.8-1613 34166 261.937 -16.212 0.006924191967493827

    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 20 64.407036  43.037970
 Obj: 2023 8 25 20 297.942444  7.403974
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 20 21.356252  67.638890
 Obj: 2023 8 25 20 279.114229  -16.677163
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 20 5.370922  67.181524
 Obj: 2023 8 25 20 275.542959  -21.892156
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 20 279.193865  53.678990
 Obj: 2023 8 25 20 269.798454  -56.056155
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 20 261.871965  -7.182764
 Obj: 2023 8 25 20 24.766861  -38.813416
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 20 250.547746  -8.893590
 Obj: 2023 8 25 20 109.780828  -52.654657
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 20 104.685391  -4.459587
 Obj: 2023 8 25 20 350.777946  44.503383
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2023 8 25 20 123.932823  28.289921
 Obj: 2023 8 25 20 269.886120  33.774298
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1187207/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 16:59:22 EDT 2023