batgrbproduct Analysis for Trigger=291524
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 13:36:16 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger291524/GCN5_download_hand
======================================================================
Trigger: 00291524 Segment: 000
BAT Trigger Time: 211881397.504 [s; MET]
Trigger Stop: 211881398.528 [s; MET]
UTC: 2007-09-19T07:56:35.269800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 287.799605098506 Dec: 0.586431638279218 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.93
Image Trigger?: NO
Rate S/N Ratio: 12.6491106406735 [ if not an image trigger ]
Image S/N Ratio: 7.93
Flight Position: [ source = BAT ]
RA: 287.799605098506 Dec: 0.586431638279218 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 287.820889126746 Dec: 0.549469806015521 [deg; J2000]
{ 19h 11m 17.0s , +00d 32' 58.1" }
+/- 2.58931599819645 [arcmin] (estimated 90% radius based on SNR)
+/- 1.63981257998216 [arcmin] (formal 1-sigma fit error)
SNR: 7.81365112292156
RA = 19h 11m 17.0s (287.820889 deg.)
Dec = 0d 32' 58" (0.549470 deg.)
Angular difference between Flight and Ground position is 2.559084 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 5 +/- 1.4142135623731
Measured from: -1.50400000810623
to: 3.49599999189377 [s; relative to TRIGTIME]
T50: 2 +/- 1.4142135623731
Measured from: -0.504000008106232
to: 1.49599999189377 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.504000008106232
to: 0.495999991893768 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.50400000810623
to: 3.49599999189377 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.150149 0.019007 0.012602 0.001831
0.011393 0.010380 0.008855 0.007392 [error]
Peak 0.039152 0.009447 0.000127 0.002335
0.005184 0.004595 0.003988 0.003312 [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 4.30e-08 8.48e-09 8.25e-10 8.76e-11 5.23e-08 5.24e-08 erg/cm2
Error 7.23e-09 4.45e-09 1.06e-09 2.40e-10 1.02e-08 1.03e-08 erg/cm2
Peak flux Power-law 4.25e-01 5.79e-02 3.51e-03 2.26e-04 4.86e-01 4.86e-01 ph/cm2/s
Error 9.38e-02 4.08e-02 6.76e-03 1.00e-03 1.17e-01 1.17e-01 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 4.21e-08 8.40e-09 8.23e-10 8.50e-11 5.24e-08 5.42e-08 erg/cm2
Error 3.61e-09 1.43e-10 9.47e-09 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.24e-01 5.79e-02 3.50e-03 2.24e-04 4.86e-01 4.86e-01 ph/cm2/s
Error 9.38e-02 4.08e-02 6.75e-03 9.91e-04 1.17e-01 1.17e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.118 0.959 - - 1.96e-04 1.84e-04 72.449 57
CPL 1.804 0.000 1.1 0.0 1.73e-01 0.00e+00 72.905 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.696 1.372 - - 4.29e-04 0.00e+00 69.222 57
CPL 1.811 0.000 1.2 0.0 1.67e-01 0.00e+00 70.193 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 5.000 -1.504 3.496
T90 5.000 -1.504 3.496
T50 2.000 -0.504 1.496
Peak 1.000 -0.504 0.496
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
287.8209 +0.5495 0.0246 5.7 -116.2 0.1902 7.8 TRIG_00291524
------------------------------------------
Foreground time interval of the image:
-1.504 3.496 (delta_t = 5.000 [sec])
Background time interval of the image:
-10.504 -1.504 (delta_t = 9.000 [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 -1.504 sec. to 3.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.11839 ( -0.648661 1.26865 )
Norm@50keV : 1.959034E-04 ( -1.959034E-04 1.724405E-04) )
------------------------------------------------------------
Chi-Squared = 72.44920 using 59 PHA bins.
Reduced chi-squared = 1.271039 for 57 degrees of freedom
Null hypothesis probability = 8.153E-02
Photon flux (15-150 keV) in 5.000 sec: 0.335852 ( -0.057989 0.057992 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.2334e-08 ( -1.0046e-08 1.04485e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.504 sec. to 3.496 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80444 ( )
Epeak [keV] : 1.05659 ( )
Norm@50keV : 0.173154 ( )
------------------------------------------------------------
Chi-Squared = 72.90500 using 59 PHA bins.
but latest trial 1.23457 gives Chi-Squared = 0.133163
Reduced chi-squared = 1.301875 for 56 degrees of freedom
Null hypothesis probability = 6.404E-02
Photon flux (15-150 keV) in 5.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -1.504 sec. to 3.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49653 ( -0.511520 0.738807 )
beta : -8.44761 ( -4.31242 1.22881 )
Epeak [keV] : 6.39821 ( -6.29821 5.16666 )
Norm@50keV : 2.414723E-02 ( -18.5897 536.628 )
------------------------------------------------------------
Chi-Squared = 90.26847 using 59 PHA bins.
Reduced chi-squared = 1.641245 for 55 degrees of freedom
Null hypothesis probability = 1.911E-03
Photon flux (15-150 keV) in 5.000 sec: 0.335510 ( -0.057954 0.057954 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.236e-08 ( -9.83425e-09 9.1055e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.504 sec. to 0.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.69575 ( -0.822646 1.92156 )
Norm@50keV : 4.294161E-04 ( )
------------------------------------------------------------
Chi-Squared = 69.22172 using 59 PHA bins.
Reduced chi-squared = 1.214416 for 57 degrees of freedom
Null hypothesis probability = 0.129
Photon flux (15-150 keV) in 1.000 sec: 0.486204 ( -0.117121 0.116813 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55125e-08 ( -4.3847e-09 4.8479e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.504 sec. to 0.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81060 ( )
Epeak [keV] : 1.15236 ( )
Norm@50keV : 0.166964 ( )
------------------------------------------------------------
Chi-Squared = 70.19309 using 59 PHA bins.
Reduced chi-squared = 1.253448 for 56 degrees of freedom
Null hypothesis probability = 9.613E-02
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.504 sec. to 0.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.52041 ( -1.47959 3.55748 )
beta : -5.04260 ( -1.50503 1.13042 )
Epeak [keV] : 292.423 ( -292.323 9707.58 )
Norm@50keV : 4.111885E-02 ( -3.333165E-02 8.291204E-02) )
------------------------------------------------------------
Chi-Squared = 69.00829 using 59 PHA bins.
Reduced chi-squared = 1.254696 for 55 degrees of freedom
Null hypothesis probability = 9.698E-02
Photon flux (15-150 keV) in 1.000 sec: 0.485759 ( -0.117103 0.11677 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54685e-08 ( -3.9914e-09 3.4188e-09 ) ergs/cm2
Plot creation:
Fri Dec 14 13:46:03 EST 2007