batgrbproduct Analysis for Trigger=295670
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 22:12:22 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger295670/GCN5_download_cron
======================================================================
Trigger: 00295670 Segment: 000
BAT Trigger Time: 215485599.296 [s; MET]
Trigger Stop: 215485603.392 [s; MET]
UTC: 2007-10-31T01:06:36.967720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 6.45831176275914 Dec: -58.0454373126827 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.48
Image Trigger?: NO
Rate S/N Ratio: 8.71779788708135 [ if not an image trigger ]
Image S/N Ratio: 9.48
Flight Position: [ source = BAT ]
RA: 6.45831176275914 Dec: -58.0454373126827 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 6.39928469001438 Dec: -58.0476079365063 [deg; J2000]
{ 00h 25m 35.8s , -58d 02' 51.4" }
+/- 2.05333586737694 [arcmin] (estimated 90% radius based on SNR)
+/- 0.879347124196107 [arcmin] (formal 1-sigma fit error)
SNR: 10.8829581929344
RA = 0h 25m 35.8s (6.399285 deg.)
Dec = -58d 2' 51" (-58.047608 deg.)
Angular difference between Flight and Ground position is 1.878855 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 180.89200001955 +/- 30.6795635458422
Measured from: -1.24000000953674
to: 179.652000010014 [s; relative to TRIGTIME]
T50: 114.724000006914 +/- 14.3639667036533
Measured from: 6.94400000572205
to: 121.668000012636 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.91999998688698
to: 3.91999998688698 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.53200000524521
to: 192.479999989271 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.903945 0.550877 0.324993 0.190716
0.069090 0.069157 0.061724 0.054889 [error]
Peak 0.025051 0.016752 0.019540 0.007956
0.005661 0.005724 0.005125 0.004286 [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 2.81e-07 2.96e-07 2.22e-07 2.69e-07 9.02e-07 1.07e-06 erg/cm2
Error 4.46e-08 3.74e-08 6.11e-08 1.45e-07 1.31e-07 2.19e-07 erg/cm2
Peak flux Power-law 2.13e-01 1.82e-01 1.07e-01 9.33e-02 5.42e-01 5.95e-01 ph/cm2/s
Error 8.97e-02 4.80e-02 4.55e-02 8.27e-02 1.43e-01 1.60e-01 ph/cm2/s
Fluence Cutoff-PL 2.81e-07 2.97e-07 2.22e-07 2.66e-07 9.01e-07 1.07e-06 erg/cm2
Error 4.46e-08 3.75e-08 6.11e-08 1.43e-07 1.31e-07 2.18e-07 erg/cm2
Peak flux Cutoff-PL 2.13e-01 1.82e-01 1.07e-01 9.27e-02 5.42e-01 5.94e-01 ph/cm2/s
Error 8.97e-02 4.80e-02 4.56e-02 8.22e-02 1.43e-01 1.60e-01 ph/cm2/s
Fluence Band 2.75e-07 2.98e-07 2.24e-07 2.75e-07 9.04e-07 1.09e-06 erg/cm2
Error 3.15e-08 3.60e-08 2.75e-08 1.47e-07 1.05e-07 0.00e+00 erg/cm2
Peak flux Band 2.13e-01 1.82e-01 1.07e-01 9.32e-02 5.42e-01 6.00e-01 ph/cm2/s
Error 6.40e-02 4.81e-02 3.81e-02 7.97e-02 1.42e-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 2.419 0.286 - - 4.67e-04 9.10e-05 49.413 57
CPL 2.799 0.000 268.0 49.8 2.96e-04 2.10e-04 46.011 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.773 0.554 - - 3.98e-03 1.27e-03 52.572 57
CPL 1.773 0.557 9993.9 5000.0 3.98e-03 1.28e-03 52.574 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 197.012 -4.532 192.480
T90 180.892 -1.240 179.652
T50 114.724 6.944 121.668
Peak 1.000 2.920 3.920
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
6.3993 -58.0476 0.0176 27.7 -139.7 0.8980 10.9 TRIG_00295670
------------------------------------------
Foreground time interval of the image:
-4.532 41.305 (delta_t = 45.837 [sec])
Background time interval of the image:
-119.296 -4.532 (delta_t = 114.764 [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 -4.532 sec. to 192.480 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.41923 ( -0.272637 0.299394 )
Norm@50keV : 4.671574E-04 ( -9.231275E-05 8.963083E-05) )
------------------------------------------------------------
Chi-Squared = 49.41311 using 59 PHA bins.
Reduced chi-squared = 0.8668966 for 57 degrees of freedom
Null hypothesis probability = 0.752
Photon flux (15-150 keV) in 197.0 sec: 8.741913E-02 ( -0.0098599 0.00986315 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.01781e-07 ( -1.28864e-07 1.3397e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.532 sec. to 192.480 sec.
Parameters : value lower 90% higher 90%
Photon index: 2.79868 ( )
Epeak [keV] : 268.013 ( -46.4768 53.1367 )
Norm@50keV : 2.960405E-04 ( -2.776924E-04 1.428544E-04) )
------------------------------------------------------------
Chi-Squared = 46.01086 using 59 PHA bins.
but latest trial 253.877 gives Chi-Squared = 0.473660
but latest trial 343.294 gives Chi-Squared = 3.31656
Reduced chi-squared = 0.8216226 for 56 degrees of freedom
Null hypothesis probability = 0.827
Photon flux (15-150 keV) in 197.0 sec: 8.737892E-02 ( -0.00985597 0.00985908 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.01492e-07 ( -1.28739e-07 1.33972e-07 ) ergs/cm2
Band function
Time interval is from -4.532 sec. to 192.480 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59332 ( -0.757986 14.2420 )
beta : -2.32855 ( -0.299300 0.272356 )
Epeak [keV] : 9.47360 ( -9.37360 9990.53 )
Norm@50keV : 2.263565E-03 ( -1.255881E-02 1.217486E-02) )
------------------------------------------------------------
Chi-Squared = 49.75241 using 59 PHA bins.
Reduced chi-squared = 0.9045893 for 55 degrees of freedom
Null hypothesis probability = 0.675
Photon flux (15-150 keV) in 197.0 sec: 8.734319E-02 ( -0.0098289 0.00989125 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.04027e-07 ( -1.01741e-07 1.09093e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.920 sec. to 3.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77319 ( -0.520185 0.588317 )
Norm@50keV : 3.975574E-03 ( -1.336646E-03 1.211529E-03) )
------------------------------------------------------------
Chi-Squared = 52.57177 using 59 PHA bins.
Reduced chi-squared = 0.9223118 for 57 degrees of freedom
Null hypothesis probability = 0.642
Photon flux (15-150 keV) in 1.000 sec: 0.542243 ( -0.142619 0.142657 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.66676e-08 ( -1.1836e-08 1.22284e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.920 sec. to 3.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77259 ( -0.523233 0.590766 )
Epeak [keV] : 9993.87 ( -9993.86 6.13086 )
Norm@50keV : 3.980544E-03 ( -1.345652E-03 1.219366E-03) )
------------------------------------------------------------
Chi-Squared = 52.57350 using 59 PHA bins.
Reduced chi-squared = 0.9388124 for 56 degrees of freedom
Null hypothesis probability = 0.605
Photon flux (15-150 keV) in 1.000 sec: 0.542038 ( -0.142578 0.142617 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6636e-08 ( -1.18145e-08 1.22631e-08 ) ergs/cm2
Band function
Time interval is from 2.920 sec. to 3.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.40257 ( -8.59743 6.40257 )
beta : -1.77064 ( -0.936936 0.518080 )
Epeak [keV] : 16.1651 ( -16.0651 9983.83 )
Norm@50keV : 1.043836E-02 ( -1.043836E-02 190.550 )
------------------------------------------------------------
Chi-Squared = 52.57208 using 59 PHA bins.
Reduced chi-squared = 0.9558560 for 55 degrees of freedom
Null hypothesis probability = 0.568
Photon flux (15-150 keV) in 1.000 sec: 0.542316 ( -0.142204 0.142224 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65943e-08 ( -1.17535e-08 1.22702e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 22:24:31 EST 2007