batgrbproduct Analysis for Trigger=375659
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 v2.45
Process Start Time (local time): Fri Nov 13 06:13:02 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger375659/GCN5_download_cron
======================================================================
Trigger: 00375659 Segment: 000
BAT Trigger Time: 279740486.336 [s; MET]
Trigger Stop: 279740487.36 [s; MET]
UTC: 2009-11-12T17:41:21.081480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 257.727967798798 Dec: -36.7151372496385 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.23
Image Trigger?: NO
Rate S/N Ratio: 15.1986841535707 [ if not an image trigger ]
Image S/N Ratio: 7.23
Flight Position: [ source = BAT ]
RA: 257.727967798798 Dec: -36.7151372496385 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 257.750695781814 Dec: -36.7287109916453 [deg; J2000]
{ 17h 11m 00.2s , -36d 43' 43.4" }
+/- 1.46327628310422 [arcmin] (estimated 90% radius based on SNR)
+/- 0.525109409597338 [arcmin] (formal 1-sigma fit error)
SNR: 17.6578532607762
Angular difference between Flight and Ground position is 1.363104 arcmin
Partial Coding Fraction: 0.4023438 [ including projection effects ]
Duration
T90: 17.2959999442101 +/- 3.64548648674461
Measured from: -7.48799991607666
to: 9.80800002813339 [s; relative to TRIGTIME]
T50: 6.32399994134903 +/- 1.29634101311813
Measured from: -1.50399988889694
to: 4.82000005245209 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.555999994277954
to: 1.55599999427795 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.0400000214577
to: 14.7439999580383 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.504860 0.843972 0.979629 0.498387
0.061207 0.064934 0.062315 0.068113 [error]
Peak 0.033699 0.072477 0.094448 0.048329
0.012286 0.013550 0.013365 0.014113 [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 1.57e-07 3.87e-07 7.61e-07 3.71e-06 2.06e-06 5.01e-06 erg/cm2
Error 2.53e-08 3.61e-08 6.12e-08 7.24e-07 1.61e-07 7.48e-07 erg/cm2
Peak flux Power-law 3.84e-01 5.48e-01 5.81e-01 1.14e+00 1.87e+00 2.65e+00 ph/cm2/s
Error 1.52e-01 1.30e-01 1.07e-01 4.81e-01 3.40e-01 5.20e-01 ph/cm2/s
Fluence Cutoff-PL 1.57e-07 3.88e-07 7.62e-07 3.68e-06 2.06e-06 4.99e-06 erg/cm2
Error 2.53e-08 3.62e-08 6.13e-08 7.19e-07 1.61e-07 7.43e-07 erg/cm2
Peak flux Cutoff-PL 3.70e-01 5.50e-01 5.89e-01 1.01e+00 1.86e+00 2.52e+00 ph/cm2/s
Error 1.79e-01 1.34e-01 1.26e-01 8.38e-01 3.47e-01 7.14e-01 ph/cm2/s
Fluence Band 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 Band 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
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.025 0.137 - - 7.75e-03 5.74e-04 54.700 57
CPL 1.024 0.146 9999.4 0.0 7.79e-03 2.67e-03 54.710 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.917 0.328 - - 1.63e-02 2.94e-03 42.680 57
CPL 2.023 0.000 8.2 0.0 1.55e-03 0.00e+00 41.790 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: 25.344000 sec.
T50 in the 50-300 keV band: 7.104000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 24.784 -10.040 14.744
T90 17.296 -7.488 9.808
T50 6.324 -1.504 4.820
Peak 1.000 0.556 1.556
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
257.7507 -36.7287 0.0109 39.3 -139.9 3.0996 17.7 TRIG_00375659
------------------------------------------
Foreground time interval of the image:
-10.040 14.744 (delta_t = 24.784 [sec])
Background time interval of the image:
-41.135 -10.040 (delta_t = 31.095 [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.
- 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 -10.040 sec. to 14.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02522 ( -0.13897 0.135899 )
Norm@50keV : 7.74568E-03 ( -0.000575098 0.00057216 )
------------------------------------------------------------
# Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9596 for 57 degrees of freedom
# Null hypothesis probability = 5.618988e-01
Photon flux (15-150 keV) in 24.78 sec: 0.893067 ( -0.0681976 0.0685392 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05728e-06 ( -1.6044e-07 1.61398e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.040 sec. to 14.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02366 ( -0.157946 0.13434 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 7.79130E-03 ( -0.000567181 0.00478133 )
------------------------------------------------------------
# Chi-Squared = 54.71 using 59 PHA bins.
# Reduced chi-squared = 0.9769 for 56 degrees of freedom
# Null hypothesis probability = 5.238719e-01
Photon flux (15-150 keV) in 24.78 sec: 0.892723 ( -0.068183 0.068515 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0578e-06 ( -1.6056e-07 1.61491e-07 ) ergs/cm2
Band function
Time interval is from -10.040 sec. to 14.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.840052 ( 0.840052 0.840052 )
beta : -1.02522 ( -0.135845 0.139129 )
Epeak [keV] : 53.4928 ( -53.4928 9946.5 )
Norm@50keV : 1.29301E-02 ( -0.005746 0 )
------------------------------------------------------------
# Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9945 for 55 degrees of freedom
# Null hypothesis probability = 4.860850e-01
Photon flux (15-150 keV) in 24.78 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.556 sec. to 1.556 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.916853 ( -0.338778 0.318053 )
Norm@50keV : 1.62769E-02 ( -0.00296974 0.00292011 )
------------------------------------------------------------
# Chi-Squared = 42.68 using 59 PHA bins.
# Reduced chi-squared = 0.7488 for 57 degrees of freedom
# Null hypothesis probability = 9.206504e-01
Photon flux (15-150 keV) in 1 sec: 1.86866 ( -0.338938 0.340867 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81487e-07 ( -3.37893e-08 3.40762e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.556 sec. to 1.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02332 ( )
Epeak [keV] : 8.18679 ( )
Norm@50keV : 1.54725E-03 ( )
------------------------------------------------------------
# Chi-Squared = 41.79 using 59 PHA bins.
# Reduced chi-squared = 0.7463 for 56 degrees of freedom
# Null hypothesis probability = 9.210677e-01
Photon flux (15-150 keV) in 1 sec: 1.85796 ( -0.35244 0.34102 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80769e-07 ( -3.2814e-08 3.5919e-08 ) ergs/cm2
Band function
Time interval is from 0.556 sec. to 1.556 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.812943 ( 0.798299 0.798299 )
beta : 10.00000 ( -1.11589e+06 -1.11589e+06 )
Epeak [keV] : 683.879 ( -683.879 -683.879 )
Norm@50keV : 5.01698E-21 ( -8.97487e-22 1.52624e-18 )
------------------------------------------------------------
# Chi-Squared = 41.73 using 59 PHA bins.
# Reduced chi-squared = 0.7587 for 55 degrees of freedom
# Null hypothesis probability = 9.065107e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Nov 13 06:32:37 EST 2009