TDRSS lightcurve for Trigger=1512686

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 22 Sep 26 10:00:52 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1512686,   Seg_Num: 0
GRB_RA:          227.904d {+15h 11m 37s} (J2000),
                 228.218d {+15h 12m 52s} (current),
                 227.315d {+15h 09m 16s} (1950)
GRB_DEC:         +14.207d {+14d 12' 26"} (J2000),
                 +14.108d {+14d 06' 28"} (current),
                 +14.395d {+14d 23' 41"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2997 [cnts]    Image_Peak=216 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   157     E_range: 50-350 keV
BKG_INTEN:       11641 [cnts]
BKG_TIME:        36025.49 SOD {10:00:25.49} UT
BKG_DUR:         8 [sec]
GRB_DATE:        21305 TJD;   265 DOY;   26/09/22
GRB_TIME:        36039.44 SOD {10:00:39.44} UT
GRB_PHI:         -45.32 [deg]
GRB_THETA:        44.19 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     39.15 [sigma]
IMAGE_SIGNIF:    12.03 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  +1  +0  +0 -64  +0 
SUN_POSTN:       179.47d {+11h 57m 52s}   +0.23d {+00d 13' 53"}
SUN_DIST:         50.18 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:      311.48d {+20h 45m 55s}  -20.01d {-20d 00' 48"}
MOON_DIST:        88.65 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:       18.48, 54.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      220.87, 30.75 [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:        This trigger occurred at longitude,latitude = 79.35,20.46 [deg].

GCN BAT Lightcurve Notice




 GCN template for BAT paragraph 


  •  Click here! 

    At :: UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB  ***A*** (trigger=1512686).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec ,  which is 
   RA(J2000) = h m s
   Dec(J2000) = d ' "
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 ~3499 counts/sec (15-350 keV), at ~1 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: 59.008 s +/- 2.90513 s
  Estimated T50 duration: 37.12 s +/- 0.729712 s
  Estimated Peak Interval: MET   811764079.42400002 +/- 0.500000 s
  Estimated background rate 1:     4172.522 near MET 811764063.680000 s
  Estimated background rate 2:     3597.969 near MET 811764213.120000 s
  Estimated total duration: 88.96 s (for data selection)
       (from MET 811764072.960000 to MET 811764161.920000)
  Estimated total fluence: 33325.424962 count
  Created GTI with 12 entries
------------------------------------------
 

    

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

    bat_grb_pos_cat.sh   0.083

Usage: bat_grb_pos_cat.sh   []

   Searches through the BAT GRB position (all numbers in degrees)


    

    Search for this GRB position to the source locations in BAT transient monitor (search radius within 12 arcmin)
    

    python compare_catalog.py  
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
    

    Usage elevation_grd_obs.sh (ra) (dec) (UT year) (UT month) (UT day) (UT hour)
 
 
The data/results are in /local/data/bat1/prebascript/trigger1512686/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 22 06:19:05 EDT 2026