batgrbproduct Analysis for Trigger=235715
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): Wed Jan 2 09:41:16 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger235715/GCN5_download_cron
======================================================================
Trigger: 00235715 Segment: 000
BAT Trigger Time: 183691584 [s; MET]
Trigger Stop: 183691712 [s; MET]
UTC: 2006-10-28T01:26:22.466000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 97.2117735881431 Dec: 46.2699444035206 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.1
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.1
Flight Position: [ source = BAT ]
RA: 97.2117735881431 Dec: 46.2699444035206 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 97.1880442907154 Dec: 46.2896636241047 [deg; J2000]
{ 06h 28m 45.1s , +46d 17' 22.8" }
+/- 2.54696711091804 [arcmin] (estimated 90% radius based on SNR)
+/- 1.49070710531789 [arcmin] (formal 1-sigma fit error)
SNR: 7.99990890123765
RA = 6h 28m 45.1s (97.188044 deg.)
Dec = 46d 17' 23" (46.289664 deg.)
Angular difference between Flight and Ground position is 1.538873 arcmin
Partial Coding Fraction: 0.3554688 [ including projection effects ]
Duration
T90: 106.175999999046 +/- 36.4760686500928
Measured from: 56.3959999978542
to: 162.571999996901 [s; relative to TRIGTIME]
T50: 41.4600000083447 +/- 17.465467630175
Measured from: 80.0439999997616
to: 121.504000008106 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 79.9359999895096
to: 80.9359999895096 [s; relative to TRIGTIME]
Total Fluence
Measured from: 46.9399999976158
to: 166.143999993801 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.531851 0.570851 0.420578 0.166012
0.082542 0.083518 0.073299 0.064751 [error]
Peak 0.016883 0.033815 0.019257 0.018207
0.008014 0.008195 0.007031 0.006154 [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 1.66e-07 2.65e-07 3.20e-07 7.52e-07 9.68e-07 1.48e-06 erg/cm2
Error 4.14e-08 3.96e-08 7.59e-08 3.87e-07 1.72e-07 4.50e-07 erg/cm2
Peak flux Power-law 1.63e-01 2.04e-01 1.85e-01 2.91e-01 6.51e-01 8.43e-01 ph/cm2/s
Error 9.84e-02 7.47e-02 5.44e-02 2.01e-01 1.94e-01 2.37e-01 ph/cm2/s
Fluence Cutoff-PL 1.66e-07 2.66e-07 3.20e-07 7.46e-07 9.68e-07 1.49e-06 erg/cm2
Error 4.14e-08 3.96e-08 7.61e-08 3.84e-07 1.72e-07 4.47e-07 erg/cm2
Peak flux Cutoff-PL 1.63e-01 2.04e-01 1.85e-01 2.89e-01 6.51e-01 8.41e-01 ph/cm2/s
Error 9.83e-02 7.48e-02 5.45e-02 2.00e-01 1.94e-01 2.36e-01 ph/cm2/s
Fluence Band 1.60e-07 3.17e-05 3.79e-05 8.17e-05 1.05e-04 1.56e-06 erg/cm2
Error 2.06e-05 2.22e-05 5.39e-05 6.80e-05 2.42e-07 0.00e+00 erg/cm2
Peak flux Band 1.71e-01 1.99e-01 1.86e-01 3.00e-01 6.46e-01 8.71e-01 ph/cm2/s
Error 6.92e-02 5.44e-02 5.20e-02 2.39e-01 1.86e-01 2.39e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.732 0.303 - - 8.79e-04 1.49e-04 46.683 57
CPL 1.730 0.000 9923.1 0.0 8.83e-04 4.38e-04 46.690 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.141 0.535 - - 5.59e-03 1.58e-03 60.886 57
CPL 1.137 0.539 9997.4 5000.0 5.62e-03 1.58e-03 60.891 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 119.204 46.940 166.144
T90 106.176 56.396 162.572
T50 41.460 80.044 121.504
Peak 1.000 79.936 80.936
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
97.1880 +46.2897 0.0241 30.2 101.2 1.2682 8.0 TRIG_00235715
------------------------------------------
Foreground time interval of the image:
46.940 135.601 (delta_t = 88.661 [sec])
Background time interval of the image:
-239.000 46.940 (delta_t = 285.940 [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 46.940 sec. to 166.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73199 ( -0.295086 0.310932 )
Norm@50keV : 8.787326E-04 ( -1.516968E-04 1.453243E-04) )
------------------------------------------------------------
Chi-Squared = 46.68259 using 59 PHA bins.
Reduced chi-squared = 0.8189928 for 57 degrees of freedom
Null hypothesis probability = 0.834
Photon flux (15-150 keV) in 119.2 sec: 0.118042 ( -0.017737 0.017765 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.67663e-07 ( -1.7081e-07 1.73773e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 46.940 sec. to 166.144 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73002 ( )
Epeak [keV] : 9923.11 ( )
Norm@50keV : 8.828973E-04 ( -1.770512E-04 6.989380E-04) )
------------------------------------------------------------
Chi-Squared = 46.68997 using 59 PHA bins.
but latest trial 1.21372 gives Chi-Squared = 8.08574
Reduced chi-squared = 0.8337495 for 56 degrees of freedom
Null hypothesis probability = 0.808
Photon flux (15-150 keV) in 119.2 sec: 0.117995 ( -0.017732 0.017758 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.67548e-07 ( -1.70787e-07 1.73914e-07 ) ergs/cm2
Band function
Time interval is from 46.940 sec. to 166.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41198 ( -4.625320E-04 14.9995 )
beta : -1.68725 ( -0.311053 0.294964 )
Epeak [keV] : 7.90464 ( -7.80464 9992.10 )
Norm@50keV : 2.396049E-03 ( -2.061414E-02 1.974684E-02) )
------------------------------------------------------------
Chi-Squared = 46.74369 using 59 PHA bins.
Reduced chi-squared = 0.8498853 for 55 degrees of freedom
Null hypothesis probability = 0.778
Photon flux (15-150 keV) in 119.2 sec: 0.117810 ( -0.017534 0.017414 ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000105058 ( -0.000105058 3.08646e-05 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 79.936 sec. to 80.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14148 ( -0.574478 0.496096 )
Norm@50keV : 5.591876E-03 ( -1.598137E-03 1.552517E-03) )
------------------------------------------------------------
Chi-Squared = 60.88631 using 59 PHA bins.
Reduced chi-squared = 1.068181 for 57 degrees of freedom
Null hypothesis probability = 0.338
Photon flux (15-150 keV) in 1.000 sec: 0.651481 ( -0.193272 0.194949 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.77203e-08 ( -1.64975e-08 1.66268e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 79.936 sec. to 80.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13716 ( -0.578742 0.499028 )
Epeak [keV] : 9997.44 ( -9997.43 2.55664 )
Norm@50keV : 5.621167E-03 ( -1.600054E-03 1.557746E-03) )
------------------------------------------------------------
Chi-Squared = 60.89141 using 59 PHA bins.
Reduced chi-squared = 1.087347 for 56 degrees of freedom
Null hypothesis probability = 0.304
Photon flux (15-150 keV) in 1.000 sec: 0.651314 ( -0.193206 0.194898 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.77358e-08 ( -1.65123e-08 1.66336e-08 ) ergs/cm2
Band function
Time interval is from 79.936 sec. to 80.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.627203 ( -9.37280 5.62720 )
beta : -1.16561 ( -8.83439 0.589792 )
Epeak [keV] : 81.8749 ( -81.7749 9918.12 )
Norm@50keV : 1.227608E-02 ( -32.8478 51.6958 )
------------------------------------------------------------
Chi-Squared = 60.81752 using 59 PHA bins.
Reduced chi-squared = 1.105773 for 55 degrees of freedom
Null hypothesis probability = 0.274
Photon flux (15-150 keV) in 1.000 sec: 0.646455 ( -0.186071 0.185787 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.70015e-08 ( -1.71592e-08 1.66905e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 09:57:34 EST 2008