batgrbproduct Analysis for Trigger=309665
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Sun Apr 20 17:47:16 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger309665/GCN5_download_cron
======================================================================
Trigger: 00309665 Segment: 000
BAT Trigger Time: 230357569.932 [s; MET]
Trigger Stop: 230357569.996 [s; MET]
UTC: 2008-04-20T04:12:47.201400 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 152.63862068891 Dec: 43.2424356136468 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.61
Image Trigger?: NO
Rate S/N Ratio: 8.88819441731559 [ if not an image trigger ]
Image S/N Ratio: 6.61
Flight Position: [ source = BAT ]
RA: 152.63862068891 Dec: 43.2424356136468 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 152.786330735592 Dec: 43.2532786737384 [deg; J2000]
{ 10h 11m 08.7s , +43d 15' 11.8" }
+/- 3.06593477093807 [arcmin] (estimated 90% radius based on SNR)
+/- 1.91818520448548 [arcmin] (formal 1-sigma fit error)
SNR: 6.13802294249807
RA = 10h 11m 8.7s (152.786331 deg.)
Dec = 43d 15' 12" (43.253279 deg.)
Angular difference between Flight and Ground position is 6.488189 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0639999806880951 +/-
Measured from: 0
to: 0.0639999806880951 [s; relative to TRIGTIME]
T50: 0.0639999806880951 +/-
Measured from: 0
to: 0.0639999806880951 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0639999806880951 second)
Measured from: -1.49011611938477e-08
to: 0.0639999657869339 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0639999806880951 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.001209 0.000189 0.006364 0.005288
0.001253 0.001163 0.001291 0.001337 [error]
Peak 0.001209 0.000189 0.006364 0.005288
0.001253 0.001163 0.001291 0.001337 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 7.87e-11 4.57e-10 2.31e-09 5.08e-08 7.38e-09 2.81e-08 erg/cm2
Error 1.42e-10 4.84e-10 1.64e-09 6.17e-08 2.86e-09 0.00e+00 erg/cm2
Peak flux Power-law 3.81e-02 1.17e-01 2.96e-01 2.12e+00 8.04e-01 2.57e+00 ph/cm2/s
Error 7.01e-02 1.28e-01 2.13e-01 2.85e+00 5.76e-01 2.34e+00 ph/cm2/s
Fluence Cutoff-PL 2.81e-11 3.85e-10 2.84e-09 1.15e-08 7.51e-09 1.41e-08 erg/cm2
Error 1.21e-10 3.75e-10 2.02e-09 6.49e-08 3.09e-09 6.50e-08 erg/cm2
Peak flux Cutoff-PL 3.79e-02 1.17e-01 2.97e-01 2.11e+00 8.05e-01 2.56e+00 ph/cm2/s
Error 6.98e-02 1.28e-01 2.03e-01 3.04e+00 5.76e-01 2.52e+00 ph/cm2/s
Fluence Band 1.07e-11 3.04e-10 2.95e-09 2.31e-08 7.38e-09 7.19e-09 erg/cm2
Error 4.21e-10 1.37e-09 5.60e-08 2.91e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 8.03e-03 6.47e-02 3.64e-01 1.29e+00 7.80e-01 1.12e+00 ph/cm2/s
Error 1.37e-01 2.14e+00 2.96e-01 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.335 1.641 - - 5.19e-03 4.53e-03 48.888 57
CPL -2.435 0.000 177.3 174.1 1.76e-02 5.96e-02 48.314 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.335 1.641 - - 5.19e-03 4.53e-03 48.888 57
CPL -2.435 0.000 177.3 174.1 1.76e-02 5.96e-02 48.314 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 -0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
152.7863 +43.2533 0.0313 2.3 -90.9 0.0151 6.1 TRIG_00309665
------------------------------------------
Foreground time interval of the image:
0.012 0.076 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.920 -56.682 (delta_t = 4.238 [sec])
-55.920 -1.920 (delta_t = 54.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.012 sec. to 0.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.335401 ( -2.33955 0.941506 )
Norm@50keV : 5.192598E-03 ( -5.192598E-03 3.872684E-03) )
------------------------------------------------------------
Chi-Squared = 48.88795 using 59 PHA bins.
Reduced chi-squared = 0.8576834 for 57 degrees of freedom
Null hypothesis probability = 0.769
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.804170 ( -0.80417 0.34711 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.38048e-09 ( -2.86444e-09 2.86144e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 0.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.43463 ( )
Epeak [keV] : 177.311 ( -150.530 197.654 )
Norm@50keV : 1.756750E-02 ( -2.771996E-02 9.138155E-02) )
------------------------------------------------------------
Chi-Squared = 48.31361 using 59 PHA bins.
Reduced chi-squared = 0.8627430 for 56 degrees of freedom
Null hypothesis probability = 0.758
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.804574 ( -0.804574 0.346616 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.50598e-09 ( -3.05349e-09 3.12442e-09 ) ergs/cm2
Band function
Time interval is from 0.012 sec. to 0.076 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.223794 ( -9.77621 5.22379 )
beta : 0.335445 ( -0.941507 1.82033 )
Epeak [keV] : 21.7178 ( -21.6178 9978.28 )
Norm@50keV : 7.758556E-03 ( -7.758556E-03 10870.4 )
------------------------------------------------------------
Chi-Squared = 48.88795 using 59 PHA bins.
Reduced chi-squared = 0.8888719 for 55 degrees of freedom
Null hypothesis probability = 0.706
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.779792 ( -0.292301 0.299268 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.38387e-09 ( -2.923e-09 2.89946e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.012 sec. to 0.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.335401 ( -2.33955 0.941506 )
Norm@50keV : 5.192598E-03 ( -5.192598E-03 3.872684E-03) )
------------------------------------------------------------
Chi-Squared = 48.88795 using 59 PHA bins.
Reduced chi-squared = 0.8576834 for 57 degrees of freedom
Null hypothesis probability = 0.769
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.804170 ( -0.80417 0.34711 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.38048e-09 ( -2.86444e-09 2.86144e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 0.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.43463 ( )
Epeak [keV] : 177.311 ( -150.530 197.654 )
Norm@50keV : 1.756750E-02 ( -2.771996E-02 9.138155E-02) )
------------------------------------------------------------
Chi-Squared = 48.31361 using 59 PHA bins.
Reduced chi-squared = 0.8627430 for 56 degrees of freedom
Null hypothesis probability = 0.758
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.804574 ( -0.804574 0.346616 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.50598e-09 ( -3.05349e-09 3.12442e-09 ) ergs/cm2
Band function
Time interval is from 0.012 sec. to 0.076 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.223794 ( -9.77621 5.22379 )
beta : 0.335445 ( -0.941507 1.82033 )
Epeak [keV] : 21.7178 ( -21.6178 9978.28 )
Norm@50keV : 7.758556E-03 ( -7.758556E-03 10870.4 )
------------------------------------------------------------
Chi-Squared = 48.88795 using 59 PHA bins.
Reduced chi-squared = 0.8888719 for 55 degrees of freedom
Null hypothesis probability = 0.706
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.779792 ( -0.292301 0.299268 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.38387e-09 ( -2.923e-09 2.89946e-09 ) ergs/cm2
Plot creation:
Sun Apr 20 17:58:39 EDT 2008