batgrbproduct Analysis for Trigger=296503
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): Fri Dec 14 23:23:23 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger296503/GCN5_download_cron
======================================================================
Trigger: 00296503 Segment: 000
BAT Trigger Time: 216584613.888 [s; MET]
Trigger Stop: 216584614.144 [s; MET]
UTC: 2007-11-12T18:23:31.530800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 260.304966584962 Dec: -80.884395671755 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.92
Image Trigger?: NO
Rate S/N Ratio: 21.2837966537928 [ if not an image trigger ]
Image S/N Ratio: 7.92
Flight Position: [ source = BAT ]
RA: 260.304966584962 Dec: -80.884395671755 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 260.207131434356 Dec: -80.8865105231738 [deg; J2000]
{ 17h 20m 49.7s , -80d 53' 11.4" }
+/- 2.25100257528699 [arcmin] (estimated 90% radius based on SNR)
+/- 1.02200895728301 [arcmin] (formal 1-sigma fit error)
SNR: 9.54386100884328
RA = 17h 20m 49.7s (260.207131 deg.)
Dec = -80d 53' 11" (-80.886511 deg.)
Angular difference between Flight and Ground position is 0.938494 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 0.303999960422516 +/- 0.090509661754147
Measured from: -0.0480000078678131
to: 0.255999952554703 [s; relative to TRIGTIME]
T50: 0.111999988555908 +/- 0.0576888133320096
Measured from: 0.0319999754428864
to: 0.143999963998795 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.380000025033951
to: 0.619999974966049 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0480000078678131
to: 0.27199998497963 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.004531 0.020505 0.027699 0.011628
0.003658 0.003908 0.003951 0.003187 [error]
Peak 0.005137 0.019878 0.027120 0.011906
0.003736 0.003966 0.003996 0.003242 [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 2.26e-09 6.84e-09 1.74e-08 1.27e-07 4.75e-08 1.50e-07 erg/cm2
Error 1.04e-09 1.97e-09 3.32e-09 5.62e-08 9.18e-09 5.68e-08 erg/cm2
Peak flux Power-law 1.99e-01 3.42e-01 4.46e-01 1.18e+00 1.31e+00 2.17e+00 ph/cm2/s
Error 9.99e-02 1.07e-01 8.49e-02 4.87e-01 2.75e-01 4.84e-01 ph/cm2/s
Fluence Cutoff-PL 1.36e-09 7.08e-09 2.08e-08 3.43e-08 4.62e-08 5.83e-08 erg/cm2
Error 1.17e-09 2.38e-09 5.08e-09 6.39e-08 1.00e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.33e-01 3.40e-01 5.15e-01 5.41e-01 1.27e+00 1.53e+00 ph/cm2/s
Error 1.17e-01 1.23e-01 1.01e-01 6.81e-01 2.77e-01 7.24e-01 ph/cm2/s
Fluence Band 1.35e-09 7.06e-09 2.04e-08 6.26e-08 4.57e-08 6.41e-08 erg/cm2
Error 5.48e-10 2.40e-09 5.10e-09 7.57e-08 9.23e-09 6.64e-08 erg/cm2
Peak flux Band 1.62e-01 3.47e-01 5.13e-01 7.81e-01 1.24e+00 1.68e+00 ph/cm2/s
Error 1.39e-01 1.32e-01 5.31e-01 2.79e-01 5.85e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.656 0.348 - - 1.19e-02 2.65e-03 67.620 57
CPL -0.893 1.885 120.0 4959.2 4.77e-02 1.08e-01 65.258 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.615 0.364 - - 1.12e-02 2.61e-03 67.727 57
CPL -0.519 1.928 145.3 4957.1 3.06e-02 1.01e-01 66.416 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: 0.256000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.320 -0.048 0.272
T90 0.304 -0.048 0.256
T50 0.112 0.032 0.144
Peak 1.000 -0.380 0.620
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
260.2071 -80.8865 0.0200 32.9 -173.3 0.0691 9.5 TRIG_00296503
------------------------------------------
Foreground time interval of the image:
-0.048 0.272 (delta_t = 0.320 [sec])
Background time interval of the image:
-239.888 -0.048 (delta_t = 239.840 [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 -0.048 sec. to 0.272 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.655542 ( -0.366924 0.328461 )
Norm@50keV : 1.190452E-02 ( -2.705391E-03 2.600592E-03) )
------------------------------------------------------------
Chi-Squared = 67.62003 using 59 PHA bins.
Reduced chi-squared = 1.186316 for 57 degrees of freedom
Null hypothesis probability = 0.159
Photon flux (15-150 keV) in 0.3200 sec: 1.38147 ( -0.28291 0.28676 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.74886e-08 ( -9.19936e-09 9.16096e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.048 sec. to 0.272 sec.
Parameters : value lower 90% higher 90%
Photon index: -0.892960 ( -2.10704 1.66387 )
Epeak [keV] : 120.011 ( -38.4146 9879.99 )
Norm@50keV : 4.767847E-02 ( -3.667373E-02 0.178752 )
------------------------------------------------------------
Chi-Squared = 65.25813 using 59 PHA bins.
but latest trial 81.5961 gives Chi-Squared = 2.61827
but latest trial 0.233918 gives Chi-Squared = 2.81752
Reduced chi-squared = 1.165324 for 56 degrees of freedom
Null hypothesis probability = 0.186
Photon flux (15-150 keV) in 0.3200 sec: 1.32762 ( -0.28559 0.29143 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.6161e-08 ( -1.02141e-08 9.85536e-09 ) ergs/cm2
Band function
Time interval is from -0.048 sec. to 0.272 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25339 ( -8.74661 6.25339 )
beta : -0.655518 ( -0.328485 0.366898 )
Epeak [keV] : 17.2584 ( -27.7269 2455.83 )
Norm@50keV : 1.472297E-02 ( -3.985177E-02 46.0146 )
------------------------------------------------------------
Chi-Squared = 67.62003 using 59 PHA bins.
Reduced chi-squared = 1.229455 for 55 degrees of freedom
Null hypothesis probability = 0.118
Photon flux (15-150 keV) in 0.3200 sec: 1.32789 ( -0.28538 0.29117 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.57187e-08 ( -9.5136e-09 8.9552e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.048 sec. to 0.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.614806 ( -0.386680 0.341329 )
Norm@50keV : 1.122865E-02 ( -2.668348E-03 2.545704E-03) )
------------------------------------------------------------
Chi-Squared = 67.72730 using 59 PHA bins.
Reduced chi-squared = 1.188198 for 57 degrees of freedom
Null hypothesis probability = 0.156
Photon flux (15-150 keV) in 0.3360 sec: 1.30873 ( -0.27334 0.27739 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79059e-08 ( -9.28973e-09 9.3072e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.048 sec. to 0.288 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.518657 ( -2.48134 1.37517 )
Epeak [keV] : 145.264 ( -59.4171 9854.74 )
Norm@50keV : 3.056883E-02 ( -3.056883E-02 0.171520 )
------------------------------------------------------------
Chi-Squared = 66.41564 using 59 PHA bins.
but latest trial 0.202089 gives Chi-Squared = 2.78346
Reduced chi-squared = 1.185994 for 56 degrees of freedom
Null hypothesis probability = 0.161
Photon flux (15-150 keV) in 0.3360 sec: 1.27317 ( -0.273571 0.28016 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.72772e-08 ( -1.01885e-08 9.72317e-09 ) ergs/cm2
Band function
Time interval is from -0.048 sec. to 0.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.630348 ( -15.0000 0.00000 )
beta : -0.614664 ( -0.344848 0.385522 )
Epeak [keV] : 18.1927 ( -39.2439 32.9449 )
Norm@50keV : 1.624982E-02 ( -13.6691 752638. )
------------------------------------------------------------
Chi-Squared = 67.72731 using 59 PHA bins.
Reduced chi-squared = 1.231406 for 55 degrees of freedom
Null hypothesis probability = 0.116
Photon flux (15-150 keV) in 0.3360 sec: 1.23851 ( -0.26772 0.29114 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.72409e-08 ( -1.01637e-08 9.7272e-09 ) ergs/cm2
Plot creation:
Fri Dec 14 23:39:39 EST 2007