batgrbproduct Analysis for Trigger=316534
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): Thu Jul 10 19:03:40 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger316534/SDC
======================================================================
Trigger: 00316534 Segment: 000
BAT Trigger Time: 237366793.728 [s; MET]
Trigger Stop: 237366797.824 [s; MET]
UTC: 2008-07-10T07:13:10.798420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 8.25709402209318 Dec: 19.4919117249144 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.57
Image Trigger?: NO
Rate S/N Ratio: 12 [ if not an image trigger ]
Image S/N Ratio: 8.57
Flight Position: [ source = BAT ]
RA: 8.25709402209318 Dec: 19.4919117249144 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 8.25924160262501 Dec: 19.4835559602816 [deg; J2000]
{ 00h 33m 02.2s , +19d 29' 00.8" }
+/- 2.34671986865625 [arcmin] (estimated 90% radius based on SNR)
+/- 1.40961376016213 [arcmin] (formal 1-sigma fit error)
SNR: 8.99265686748045
Angular difference between Flight and Ground position is 0.515852 arcmin
Partial Coding Fraction: 0.484375 [ including projection effects ]
Duration
T90: 119.659999996424 +/- 17.4370466608647
Measured from: -92.2359999716282
to: 27.4240000247955 [s; relative to TRIGTIME]
T50: 69 +/- 14.6999888568544
Measured from: -65.4119999706745
to: 3.58800002932549 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.888000011444092
to: 1.88800001144409 [s; relative to TRIGTIME]
Total Fluence
Measured from: -96.919999986887
to: 43.3320000171661 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.614461 0.759623 0.605963 0.175092
0.087256 0.088920 0.084157 0.084810 [error]
Peak 0.037805 0.046180 0.025739 0.008408
0.007648 0.008107 0.007620 0.007476 [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 1.76e-07 3.31e-07 4.79e-07 1.48e-06 1.36e-06 2.47e-06 erg/cm2
Error 3.79e-08 4.22e-08 8.43e-08 5.72e-07 2.01e-07 6.37e-07 erg/cm2
Peak flux Power-law 3.91e-01 3.26e-01 1.85e-01 1.55e-01 9.71e-01 1.06e+00 ph/cm2/s
Error 1.10e-01 6.47e-02 5.92e-02 9.57e-02 1.92e-01 2.18e-01 ph/cm2/s
Fluence Cutoff-PL 1.77e-07 3.31e-07 4.80e-07 1.46e-06 1.36e-06 2.37e-06 erg/cm2
Error 3.79e-08 4.22e-08 8.45e-08 5.67e-07 2.01e-07 8.69e-07 erg/cm2
Peak flux Cutoff-PL 3.76e-01 3.56e-01 1.76e-01 5.35e-02 9.46e-01 9.61e-01 ph/cm2/s
Error 1.17e-01 9.10e-02 8.20e-02 1.25e-01 1.98e-01 2.48e-01 ph/cm2/s
Fluence Band 1.75e-07 3.30e-07 4.79e-07 1.46e-06 1.36e-06 2.16e-06 erg/cm2
Error 3.75e-08 4.21e-08 8.43e-08 8.00e-07 1.53e-07 0.00e+00 erg/cm2
Peak flux Band 3.68e-01 3.78e-01 1.64e-01 9.68e-02 9.63e-01 1.01e+00 ph/cm2/s
Error 1.30e-01 9.20e-02 4.76e-02 5.48e-02 1.94e-01 2.28e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.466 0.234 - - 1.02e-03 1.32e-04 65.722 57
CPL 1.408 0.000 520.6 0.0 1.09e-03 8.15e-04 65.860 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.819 0.361 - - 6.99e-03 1.71e-03 58.510 57
CPL 1.127 1.743 49.0 5000.0 1.84e-02 4.25e-01 57.843 0
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: 121.216000 sec.
T50 in the 50-300 keV band: 80.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 140.252 -96.920 43.332
T90 119.660 -92.236 27.424
T50 69.000 -65.412 3.588
Peak 1.000 0.888 1.888
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
8.2592 +19.4836 0.0214 25.7 85.1 2.1652 9.0 TRIG_00316534
------------------------------------------
Foreground time interval of the image:
-96.920 43.332 (delta_t = 140.252 [sec])
Background time interval of the image:
-239.728 -96.920 (delta_t = 142.808 [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 -96.920 sec. to 43.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46631 ( -0.232331 0.236156 )
Norm@50keV : 1.016929E-03 ( -1.325564E-04 1.306895E-04) )
------------------------------------------------------------
Chi-Squared = 65.72200 using 59 PHA bins.
Reduced chi-squared = 1.153018 for 57 degrees of freedom
Null hypothesis probability = 0.200
Photon flux (15-150 keV) in 140.3 sec: 0.125837 ( -0.015574 0.015601 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36071e-06 ( -1.98268e-07 2.03283e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -96.920 sec. to 43.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40839 ( )
Epeak [keV] : 520.581 ( )
Norm@50keV : 1.086548E-03 ( -4.022591E-04 1.228574E-03) )
------------------------------------------------------------
Chi-Squared = 65.86020 using 59 PHA bins.
Reduced chi-squared = 1.176075 for 56 degrees of freedom
Null hypothesis probability = 0.173
Photon flux (15-150 keV) in 140.3 sec: 0.125789 ( -0.01557 0.015595 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.361e-06 ( -1.98626e-07 2.0301e-07 ) ergs/cm2
Band function
Time interval is from -96.920 sec. to 43.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.985959 ( -2.18236 10.3472 )
beta : -1.54163 ( -0.236398 0.232054 )
Epeak [keV] : 79.9913 ( -79.8913 9920.01 )
Norm@50keV : 1.951225E-03 ( -1.804820E-02 1.775073E-02) )
------------------------------------------------------------
Chi-Squared = 66.43231 using 59 PHA bins.
Reduced chi-squared = 1.207860 for 55 degrees of freedom
Null hypothesis probability = 0.139
Photon flux (15-150 keV) in 140.3 sec: 2.41950 ( -2.4195 4351.64 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36027e-06 ( -1.03718e-07 2.02332e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.888 sec. to 1.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81936 ( -0.348313 0.374274 )
Norm@50keV : 6.992909E-03 ( -1.737981E-03 1.682890E-03) )
------------------------------------------------------------
Chi-Squared = 58.50969 using 59 PHA bins.
Reduced chi-squared = 1.026486 for 57 degrees of freedom
Null hypothesis probability = 0.420
Photon flux (15-150 keV) in 1.000 sec: 0.970942 ( -0.19229 0.192298 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.42637e-08 ( -1.55487e-08 1.65194e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.888 sec. to 1.888 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12741 ( -2.51176 0.973556 )
Epeak [keV] : 49.0057 ( -48.9957 9950.99 )
Norm@50keV : 1.844953E-02 ( -1.844953E-02 0.831502 )
------------------------------------------------------------
Chi-Squared = 57.84293 using 59 PHA bins.
but latest trial 2.03470 gives Chi-Squared = 1.16421
Reduced chi-squared = 1.032910 for 56 degrees of freedom
Null hypothesis probability = 0.407
Photon flux (15-150 keV) in 1.000 sec: 0.946088 ( -0.1978 0.198382 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.82518e-08 ( -1.7937e-08 2.00299e-08 ) ergs/cm2
Band function
Time interval is from 0.888 sec. to 1.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.653931 ( -11.7105 3.28947 )
beta : -2.12689 ( -1.26539 0.620940 )
Epeak [keV] : 37.0822 ( -31.1957 39.5650 )
Norm@50keV : 4.238782E-02 ( -308.532 82.1465 )
------------------------------------------------------------
Chi-Squared = 56.95712 using 59 PHA bins.
Reduced chi-squared = 1.035584 for 55 degrees of freedom
Null hypothesis probability = 0.402
Photon flux (15-150 keV) in 1.000 sec: 0.962624 ( -0.192705 0.195606 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.99421e-08 ( -1.62188e-08 1.82442e-08 ) ergs/cm2
Plot creation:
Thu Jul 10 20:37:37 EDT 2008