batgrbproduct Analysis for Trigger=306323
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): Sat Mar 15 12:08:34 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger306323/GCN5_download_cron
======================================================================
Trigger: 00306323 Segment: 000
BAT Trigger Time: 227240704 [s; MET]
Trigger Stop: 227240768 [s; MET]
UTC: 2008-03-15T02:25:01.356140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 155.181603570327 Dec: 41.7290018673236 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.51
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.51
Flight Position: [ source = BAT ]
RA: 155.181603570327 Dec: 41.7290018673236 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 155.120534059757 Dec: 41.6769779816198 [deg; J2000]
{ 10h 20m 28.9s , +41d 40' 37.1" }
+/- 3.2971561790511 [arcmin] (estimated 90% radius based on SNR)
+/- 1.33997528157672 [arcmin] (formal 1-sigma fit error)
SNR: 5.532469989867
RA = 10h 20m 28.9s (155.120534 deg.)
Dec = 41d 40' 37" (41.676978 deg.)
Angular difference between Flight and Ground position is 4.150578 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.175677 0.128365 0.012812 -0.010311
0.034713 0.034753 0.031112 0.027847 [error]
Peak 0.175677 0.128365 0.012812 -0.010311
0.034713 0.034753 0.031112 0.027847 [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 4.56e-08 4.57e-08 3.22e-08 3.60e-08 1.38e-07 1.60e-07 erg/cm2
Error 1.47e-08 1.62e-08 2.09e-08 4.88e-08 5.31e-08 7.97e-08 erg/cm2
Peak flux Power-law 2.35e-02 1.31e-02 4.62e-03 2.13e-03 4.24e-02 4.34e-02 ph/cm2/s
Error 7.67e-03 4.50e-03 3.93e-03 2.72e-03 1.26e-02 1.31e-02 ph/cm2/s
Fluence Cutoff-PL 4.84e-08 5.89e-08 6.01e-09 9.27e-12 1.13e-07 1.13e-07 erg/cm2
Error 1.52e-08 2.19e-08 1.42e-08 1.84e-09 3.46e-08 3.46e-08 erg/cm2
Peak flux Cutoff-PL 2.41e-02 1.75e-02 1.02e-03 8.39e-07 4.26e-02 4.26e-02 ph/cm2/s
Error 7.63e-03 5.86e-03 2.28e-03 1.49e-04 1.14e-02 1.14e-02 ph/cm2/s
Fluence Band 4.63e-08 6.06e-08 8.50e-09 8.20e-11 1.16e-07 1.17e-07 erg/cm2
Error 1.25e-08 2.25e-08 8.00e-09 8.49e-11 4.34e-08 4.93e-08 erg/cm2
Peak flux Band 2.33e-02 1.73e-02 2.52e-03 3.80e-05 4.32e-02 4.32e-02 ph/cm2/s
Error 8.34e-03 5.85e-03 2.40e-03 9.59e-04 1.18e-02 1.18e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.506 0.593 - - 2.15e-04 1.06e-04 57.264 57
CPL -2.497 0.000 26.2 5.4 7.40e-01 2.06e+00 51.501 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.506 0.593 - - 2.15e-04 1.06e-04 57.264 57
CPL -2.497 0.000 26.2 5.4 7.40e-01 2.06e+00 51.501 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
155.1205 +41.6770 0.0348 15.9 15.4 0.3731 5.5 TRIG_00306323
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50632 ( -0.524396 0.660949 )
Norm@50keV : 2.148705E-04 ( -1.027265E-04 1.095185E-04) )
------------------------------------------------------------
Chi-Squared = 57.26404 using 59 PHA bins.
Reduced chi-squared = 1.004632 for 57 degrees of freedom
Null hypothesis probability = 0.465
Photon flux (15-150 keV) in 64.00 sec: 4.236378E-02 ( -0.0125243 0.0126485 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37717e-07 ( -4.98662e-08 5.62362e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49734 ( )
Epeak [keV] : 26.1852 ( -4.81761 6.04510 )
Norm@50keV : 0.740117 ( -1.10056 3.01790 )
------------------------------------------------------------
Chi-Squared = 51.50075 using 59 PHA bins.
Reduced chi-squared = 0.9196563 for 56 degrees of freedom
Null hypothesis probability = 0.646
Photon flux (15-150 keV) in 64.00 sec: 4.262683E-02 ( -0.0114477 0.0114479 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13368e-07 ( -3.24966e-08 3.66445e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.813142 ( -13.8194 0.195224 )
beta : -9.36820 ( -0.643333 19.3566 )
Epeak [keV] : 22.5017 ( -3.88789 9977.50 )
Norm@50keV : 3.109449E-03 ( -29.2305 93.6996 )
------------------------------------------------------------
Chi-Squared = 53.80214 using 59 PHA bins.
Reduced chi-squared = 0.9782206 for 55 degrees of freedom
Null hypothesis probability = 0.520
Photon flux (15-150 keV) in 64.00 sec: 4.320567E-02 ( -0.0117988 0.0117988 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16294e-07 ( -3.32435e-08 5.35245e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50632 ( -0.524396 0.660949 )
Norm@50keV : 2.148705E-04 ( -1.027265E-04 1.095185E-04) )
------------------------------------------------------------
Chi-Squared = 57.26404 using 59 PHA bins.
Reduced chi-squared = 1.004632 for 57 degrees of freedom
Null hypothesis probability = 0.465
Photon flux (15-150 keV) in 64.00 sec: 4.236378E-02 ( -0.0125243 0.0126485 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37717e-07 ( -4.98662e-08 5.62362e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49734 ( )
Epeak [keV] : 26.1852 ( -4.81761 6.04510 )
Norm@50keV : 0.740117 ( -1.10056 3.01790 )
------------------------------------------------------------
Chi-Squared = 51.50075 using 59 PHA bins.
Reduced chi-squared = 0.9196563 for 56 degrees of freedom
Null hypothesis probability = 0.646
Photon flux (15-150 keV) in 64.00 sec: 4.262683E-02 ( -0.0114477 0.0114479 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13368e-07 ( -3.24966e-08 3.66445e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.813142 ( -4.39772 0.421051 )
beta : -9.36820 ( -6.71467 13.2852 )
Epeak [keV] : 22.5017 ( -3.36072 9977.50 )
Norm@50keV : 3.109449E-03 ( -26.6539 62.7368 )
------------------------------------------------------------
Chi-Squared = 53.80214 using 59 PHA bins.
Reduced chi-squared = 0.9782206 for 55 degrees of freedom
Null hypothesis probability = 0.520
Photon flux (15-150 keV) in 64.00 sec: 4.320567E-02 ( -0.0117988 0.0117988 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16294e-07 ( -3.32435e-08 5.35245e-08 ) ergs/cm2
Plot creation:
Sat Mar 15 12:20:53 EDT 2008