batgrbproduct Analysis for Trigger=331592
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): Tue Oct 14 11:40:50 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger331592/GCN5_download_cron
======================================================================
Trigger: 00331592 Segment: 000
BAT Trigger Time: 245625544 [s; MET]
Trigger Stop: 245625608 [s; MET]
UTC: 2008-10-13T21:19:00.827500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 47.0291707698767 Dec: 40.9513598328349 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.72
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.72
Flight Position: [ source = BAT ]
RA: 47.0291707698767 Dec: 40.9513598328349 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 47.0912531881023 Dec: 40.9633318366179 [deg; J2000]
{ 03h 08m 21.9s , +40d 57' 48.0" }
+/- 2.50445139872606 [arcmin] (estimated 90% radius based on SNR)
+/- 0.842491036043761 [arcmin] (formal 1-sigma fit error)
SNR: 8.1946222712691
Angular difference between Flight and Ground position is 2.903334 arcmin
Partial Coding Fraction: 0.6796875 [ 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 0.560616 0.225463 -0.002222 -0.053781
0.046463 0.045471 0.038834 0.033099 [error]
Peak 0.560616 0.225463 -0.002222 -0.053781
0.046463 0.045471 0.038834 0.033099 [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 1.68e-07 9.78e-08 3.60e-08 1.75e-08 3.12e-07 3.20e-07 erg/cm2
Error 2.50e-08 2.37e-08 1.85e-08 1.61e-08 5.69e-08 6.37e-08 erg/cm2
Peak flux Power-law 8.84e-02 2.91e-02 5.36e-03 1.15e-03 1.24e-01 1.24e-01 ph/cm2/s
Error 1.34e-02 6.69e-03 2.67e-03 1.23e-03 1.77e-02 1.79e-02 ph/cm2/s
Fluence Cutoff-PL 1.76e-07 9.25e-08 3.43e-09 1.48e-12 2.72e-07 2.72e-07 erg/cm2
Error 2.75e-08 3.18e-08 1.23e-08 9.02e-10 4.67e-08 4.67e-08 erg/cm2
Peak flux Cutoff-PL 9.06e-02 2.90e-02 5.97e-04 1.37e-07 1.20e-01 1.20e-01 ph/cm2/s
Error 1.45e-02 8.95e-03 1.93e-03 7.58e-05 1.69e-02 1.71e-02 ph/cm2/s
Fluence Band 1.75e-07 9.38e-08 2.82e-08 1.07e-08 3.14e-07 3.22e-07 erg/cm2
Error 2.61e-08 1.43e-08 8.26e-09 4.64e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 8.81e-02 2.94e-02 1.51e-03 1.05e-04 1.21e-01 1.18e-01 ph/cm2/s
Error 1.27e-02 1.24e-03 5.14e-04 1.80e-02 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.442 0.430 - - 3.20e-04 1.26e-04 48.992 57
CPL 0.479 0.000 13.0 10.4 5.57e-02 0.00e+00 43.949 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.442 0.430 - - 3.20e-04 1.26e-04 48.992 57
CPL 0.479 0.000 13.0 10.4 5.57e-02 0.00e+00 43.949 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
47.0913 +40.9633 0.0236 20.9 112.0 0.7368 8.2 TRIG_00331592
------------------------------------------
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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
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: 3.44156 ( -0.398679 0.462217 )
Norm@50keV : 3.204114E-04 ( -1.161948E-04 1.354780E-04) )
------------------------------------------------------------
Chi-Squared = 48.99226 using 59 PHA bins.
Reduced chi-squared = 0.8595134 for 57 degrees of freedom
Null hypothesis probability = 0.766
Photon flux (15-150 keV) in 64.00 sec: 0.123657 ( -0.017725 0.017773 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11526e-07 ( -5.48077e-08 5.90413e-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: 0.478909 ( )
Epeak [keV] : 12.9739 ( -18.3873 2.50520 )
Norm@50keV : 5.569568E-02 ( )
------------------------------------------------------------
Chi-Squared = 43.94947 using 59 PHA bins.
Reduced chi-squared = 0.7848120 for 56 degrees of freedom
Null hypothesis probability = 0.879
Photon flux (15-150 keV) in 64.00 sec: 0.120258 ( -0.017127 0.016717 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72284e-07 ( -4.39526e-08 4.95334e-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 : -1.48237 ( -7.14279 0.687419 )
beta : -8.83616 ( -0.463402 0.398249 )
Epeak [keV] : 12.3770 ( -12.2770 9987.62 )
Norm@50keV : 4.046797E-03 ( -1.561864E-02 1.839747E-02) )
------------------------------------------------------------
Chi-Squared = 55.07672 using 59 PHA bins.
Reduced chi-squared = 1.001395 for 55 degrees of freedom
Null hypothesis probability = 0.472
Photon flux (15-150 keV) in 64.00 sec: 0.124044 ( -0.017649 0.017452 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14088e-07 ( -4.55846e-08 4.71642e-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: 3.44156 ( -0.398679 0.462217 )
Norm@50keV : 3.204114E-04 ( -1.161948E-04 1.354780E-04) )
------------------------------------------------------------
Chi-Squared = 48.99226 using 59 PHA bins.
Reduced chi-squared = 0.8595134 for 57 degrees of freedom
Null hypothesis probability = 0.766
Photon flux (15-150 keV) in 64.00 sec: 0.123657 ( -0.017725 0.017773 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11526e-07 ( -5.48077e-08 5.90413e-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: 0.478909 ( )
Epeak [keV] : 12.9739 ( -18.3873 2.50520 )
Norm@50keV : 5.569568E-02 ( )
------------------------------------------------------------
Chi-Squared = 43.94947 using 59 PHA bins.
Reduced chi-squared = 0.7848120 for 56 degrees of freedom
Null hypothesis probability = 0.879
Photon flux (15-150 keV) in 64.00 sec: 0.120258 ( -0.017127 0.016717 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72284e-07 ( -4.39526e-08 4.95334e-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 : -1.48237 ( -7.14279 0.687419 )
beta : -8.83616 ( )
Epeak [keV] : 12.3770 ( )
Norm@50keV : 4.046797E-03 ( )
------------------------------------------------------------
Chi-Squared = 55.07672 using 59 PHA bins.
Reduced chi-squared = 1.001395 for 55 degrees of freedom
Null hypothesis probability = 0.472
Photon flux (15-150 keV) in 64.00 sec: 0.120931 ( -0.0167 0.019285 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1723e-07 ( -4.56096e-08 4.89958e-08 ) ergs/cm2
Plot creation:
Tue Oct 14 12:05:57 EDT 2008