batgrbproduct Analysis for Trigger=326115
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 batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Thu Aug 6 16:24:34 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/326115
======================================================================
Trigger: 00326115 Segment: 000
BAT Trigger Time: 244306896 [s; MET]
Trigger Stop: 244307008 [s; MET]
UTC: 2008-09-28T15:01:32.866720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 95.0835644412627 Dec: -55.1733396233429 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.92
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.92
Flight Position: [ source = BAT ]
RA: 95.0835644412627 Dec: -55.1733396233429 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 95.0586102305356 Dec: -55.1721838674195 [deg; J2000]
{ 06h 20m 14.1s , -55d 10' 19.9" }
+/- 2.22363616433062 [arcmin] (estimated 90% radius based on SNR)
+/- 1.0880958083294 [arcmin] (formal 1-sigma fit error)
SNR: 9.71209794157162
Angular difference between Flight and Ground position is 0.857894 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 233.655999988317 +/- 20.8004346174656
Measured from: 64.4600000083447
to: 298.115999996662 [s; relative to TRIGTIME]
T50: 44.8199999928474 +/- 57.5655403915662
Measured from: 180.976000010967
to: 225.796000003815 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 202.82800000906
to: 203.82800000906 [s; relative to TRIGTIME]
Total Fluence
Measured from: 51.2919999957085
to: 318.939999997616 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.478144 1.639722 1.049559 0.301031
0.079465 0.082424 0.073738 0.067923 [error]
Peak 0.071823 0.101017 0.074604 0.016848
0.005805 0.006140 0.005662 0.004525 [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 4.19e-07 6.73e-07 8.16e-07 1.94e-06 2.46e-06 3.85e-06 erg/cm2
Error 4.14e-08 3.95e-08 7.38e-08 3.76e-07 1.68e-07 4.36e-07 erg/cm2
Peak flux Power-law 6.94e-01 7.02e-01 4.99e-01 5.65e-01 2.12e+00 2.46e+00 ph/cm2/s
Error 7.24e-02 4.68e-02 4.56e-02 1.03e-01 1.38e-01 1.71e-01 ph/cm2/s
Fluence Cutoff-PL 4.20e-07 6.74e-07 8.15e-07 1.92e-06 2.46e-06 3.82e-06 erg/cm2
Error 4.14e-08 3.94e-08 7.37e-08 5.70e-07 1.68e-07 6.09e-07 erg/cm2
Peak flux Cutoff-PL 6.71e-01 7.22e-01 5.07e-01 4.12e-01 2.10e+00 2.31e+00 ph/cm2/s
Error 8.25e-02 5.83e-02 4.88e-02 1.41e-01 2.54e-01 0.00e+00 ph/cm2/s
Fluence Band 4.09e-07 6.65e-07 7.97e-07 1.86e-06 2.41e-06 3.74e-06 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 6.64e-01 7.16e-01 4.91e-01 4.73e-01 2.07e+00 2.38e+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 1.723 0.115 - - 9.99e-04 6.44e-05 56.400 57
CPL 1.727 0.116 9999.4 0.0 9.98e-04 0.00e+00 56.420 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.491 0.114 - - 1.70e-02 1.20e-03 59.500 57
CPL 1.252 0.378 148.6 0.0 2.28e-02 0.00e+00 58.540 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: 21.952000 sec.
T50 in the 50-300 keV band: 10.496000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 267.648 51.292 318.940
T90 233.656 64.460 298.116
T50 44.820 180.976 225.796
Peak 1.000 202.828 203.828
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
95.0586 -55.1722 0.0199 13.9 96.2 0.8770 9.7 TRIG_00326115
------------------------------------------
Foreground time interval of the image:
51.292 81.080 (delta_t = 29.788 [sec])
82.000 121.301 (delta_t = 39.301 [sec])
Background time interval of the image:
-239.000 51.292 (delta_t = 290.292 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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
Multiple GTIs in the spectrum
tstart tstop
51.292000 81.080000
82.000000 318.940000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72251 ( -0.114499 0.116181 )
Norm@50keV : 9.99479E-04 ( -6.47474e-05 6.40567e-05 )
------------------------------------------------------------
# Chi-Squared = 56.40 using 59 PHA bins.
# Reduced chi-squared = 0.9895 for 57 degrees of freedom
# Null hypothesis probability = 4.974547e-01
Photon flux (15-150 keV) in 266.7 sec: 0.133803 ( -0.00790688 0.00792112 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46393e-06 ( -1.67345e-07 1.69196e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
51.292000 81.080000
82.000000 318.940000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72664 ( -0.118996 0.113233 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 9.98012E-04 ( )
------------------------------------------------------------
# Chi-Squared = 56.42 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 56 degrees of freedom
# Null hypothesis probability = 4.593085e-01
Photon flux (15-150 keV) in 266.7 sec: 0.133744 ( -0.007892 0.007749 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45982e-06 ( -1.63351e-07 1.73243e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
51.292000 81.080000
82.000000 318.940000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.58824 ( 1.42688 1.42688 )
beta : -1.73339 ( 1.72348 0.115266 )
Epeak [keV] : 102.321 ( -36.9096 -36.9096 )
Norm@50keV : 1.21552E-03 ( -0.000278742 0.00988151 )
------------------------------------------------------------
# Chi-Squared = 56.38 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 55 degrees of freedom
# Null hypothesis probability = 4.229317e-01
Photon flux (15-150 keV) in 266.7 sec: 0.131913 ( -0.008744 0.007697 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41386e-06 ( -1.60849e-07 9.53773e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.8429 ( )
R^2/D10^2 : 3.21235E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 143.29 using 59 PHA bins.
# Reduced chi-squared = 2.5138 for 57 degrees of freedom
# Null hypothesis probability = 2.234275e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.538e-07 2.687e-08
25- 50 7.865e-07 5.761e-08
50-150 6.574e-07 9.495e-08
15-150 1.698e-06 1.232e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 129.833 (-3.49111 81.9026)
Norm : 0.555782 (-0.0411627 0.0485247)
------------------------------------------------------------
# Chi-Squared = 61.62 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.143205e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.846e-07 3.267e-08
25- 50 6.972e-07 4.387e-08
50-150 1.292e-06 1.740e-07
15-150 2.374e-06 1.927e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.92391 (-1.01781 1.07098)
R1^2/D10^2 : 0.178470 (-0.0700929 0.137294)
kT2 [keV] : 30.9261 (-7.06199 13.6048)
R2^2/D10^2 : 8.34368E-04 (-0.000548301 0.00116673)
------------------------------------------------------------
# Chi-Squared = 57.16 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 55 degrees of freedom
# Null hypothesis probability = 3.947147e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.951e-07 7.294e-08
25- 50 6.899e-07 1.095e-07
50-150 1.439e-06 6.217e-07
15-150 2.524e-06 7.100e-07
Peak spectrum fit
Power-law model
Time interval is from 202.828 sec. to 203.828 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49148 ( -0.112815 0.114485 )
Norm@50keV : 1.69918E-02 ( -0.00120241 0.00119219 )
------------------------------------------------------------
# Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.847212e-01
Photon flux (15-150 keV) in 1 sec: 2.11642 ( -0.13783 0.137835 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6142e-07 ( -1.27901e-08 1.29144e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 202.828 sec. to 203.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25206 ( -0.457029 0.298696 )
Epeak [keV] : 148.578 ( )
Norm@50keV : 2.27974E-02 ( )
------------------------------------------------------------
# Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 56 degrees of freedom
# Null hypothesis probability = 3.821970e-01
Photon flux (15-150 keV) in 1 sec: 2.09901 ( -0.14136 0.14099 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55012e-07 ( 1.3889e-08 -1.55012e-07 ) ergs/cm2
Band function
Time interval is from 202.828 sec. to 203.828 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25194 ( 1.16768 1.16768 )
beta : -4.78373 ( 8.98965 18.9659 )
Epeak [keV] : 148.584 ( -50.669 480.647 )
Norm@50keV : 2.27967E-02 ( -0.00524294 0.00620515 )
------------------------------------------------------------
# Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.466912e-01
Photon flux (15-150 keV) in 1 sec: 2.06685 ( -0.13639 0.13958 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54913e-07 ( -1.3968e-08 1.3921e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.8655 (-1.18161 1.30924)
R^2/D10^2 : 0.317216 (-0.0855336 0.115364)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 113.28 using 59 PHA bins.
# Reduced chi-squared = 1.9874 for 57 degrees of freedom
# Null hypothesis probability = 1.347908e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.289e-08 1.425e-09
25- 50 4.749e-08 3.810e-09
50-150 5.982e-08 8.870e-09
15-150 1.202e-07 1.130e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.995 ( )
Norm : 8.64827 (-8.64827 -8.64827)
------------------------------------------------------------
# Chi-Squared = 59.15 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.971479e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.154e-08 1.125e-08
25- 50 4.143e-08 2.170e-08
50-150 9.086e-08 4.763e-08
15-150 1.538e-07 8.075e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.98320 (-1.7802 2.16123)
R1^2/D10^2 : 3.53397 (-2.15643 5.33613)
kT2 [keV] : 22.9688 (-4.55854 9.07804)
R2^2/D10^2 : 4.48892E-02 (-0.0310378 0.057681)
------------------------------------------------------------
# Chi-Squared = 62.99 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 55 degrees of freedom
# Null hypothesis probability = 2.146881e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.104e-08 6.278e-09
25- 50 3.988e-08 8.965e-09
50-150 9.326e-08 2.825e-08
15-150 1.542e-07 3.340e-08
Plot creation:
Tue Jul 26 19:02:00 EDT 2011