batgrbproduct Analysis for Trigger=532871
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 v2.46
Process Start Time (local time): Fri Sep 7 19:59:04 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger532871/GCN5_download_cron
======================================================================
Trigger: 00532871 Segment: 000
BAT Trigger Time: 368670272.704 [s; MET]
Trigger Stop: 368670273.728 [s; MET]
UTC: 2012-09-07T00:24:23.082500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 74.741267312283 Dec: -9.31372697920963 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.33
Image Trigger?: NO
Rate S/N Ratio: 15.4919333848297 [ if not an image trigger ]
Image S/N Ratio: 11.33
Flight Position: [ source = BAT ]
RA: 74.741267312283 Dec: -9.31372697920963 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 74.7452420951207 Dec: -9.31871232964096 [deg; J2000]
{ 04h 58m 58.9s , -09d 19' 07.4" }
+/- 1.84514969414642 [arcmin] (estimated 90% radius based on SNR)
+/- 0.715006626977863 [arcmin] (formal 1-sigma fit error)
SNR: 12.6786563079401
Angular difference between Flight and Ground position is 0.380603 arcmin
Partial Coding Fraction: 0.2128906 [ including projection effects ]
Duration
T90: 6.99200004339218 +/- 1.37043061304617
Measured from: 0.120000123977661
to: 7.11200016736984 [s; relative to TRIGTIME]
T50: 3.18400001525879 +/- 1.36526042789653
Measured from: 0.744000136852264
to: 3.92800015211105 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.107999980449677
to: 1.10799998044968 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0239999890327454
to: 8.13599997758865 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.261330 0.411893 0.235009 0.075536
0.034977 0.037018 0.033906 0.032149 [error]
Peak 0.079522 0.129865 0.102482 0.043445
0.013792 0.015060 0.013887 0.011780 [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 9.60e-08 1.62e-07 2.08e-07 5.35e-07 6.13e-07 1.00e-06 erg/cm2
Error 1.63e-08 1.79e-08 3.26e-08 1.72e-07 7.80e-08 2.02e-07 erg/cm2
Peak flux Power-law 8.70e-01 9.36e-01 7.15e-01 8.92e-01 2.86e+00 3.41e+00 ph/cm2/s
Error 1.98e-01 1.32e-01 1.09e-01 2.80e-01 3.71e-01 4.39e-01 ph/cm2/s
Fluence Cutoff-PL 9.99e-08 2.03e-07 2.33e-07 1.33e-07 6.37e-07 0.00e+00 erg/cm2
Error 2.09e-08 2.61e-08 4.22e-08 1.68e-07 1.01e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 8.73e-01 9.37e-01 7.15e-01 8.85e-01 2.86e+00 3.40e+00 ph/cm2/s
Error 2.02e-01 1.43e-01 1.18e-01 4.08e-01 3.71e-01 4.38e-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 1.641 0.187 - - 8.07e-03 9.59e-04 69.200 57
CPL 0.566 1.093 59.5 48.8 3.15e-02 7.97e-02 65.090 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.389 0.216 - - 2.35e-02 2.98e-03 61.140 57
CPL 1.385 1.223 9732.3 0.0 2.36e-02 2.75e-02 61.140 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: 1.024000 sec.
T50 in the 50-300 keV band: 0.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.160 -0.024 8.136
T90 6.992 0.120 7.112
T50 3.184 0.744 3.928
Peak 1.000 0.108 1.108
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
74.7452 -9.3187 0.0152 37.6 -70.5 1.0045 12.7 TRIG_00532871
------------------------------------------
Foreground time interval of the image:
-0.024 8.136 (delta_t = 8.160 [sec])
Background time interval of the image:
-239.704 -0.024 (delta_t = 239.680 [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
Time interval is from -0.024 sec. to 8.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64146 ( -0.185053 0.18977 )
Norm@50keV : 8.07113E-03 ( -0.000964445 0.000953057 )
------------------------------------------------------------
# Chi-Squared = 69.20 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.289027e-01
Photon flux (15-150 keV) in 8.16 sec: 1.05094 ( -0.116238 0.116324 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1306e-07 ( -7.74617e-08 7.86298e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 8.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.565792 ( -1.26523 0.92126 )
Epeak [keV] : 59.4936 ( -12.9693 84.5356 )
Norm@50keV : 3.15168E-02 ( -0.0315755 0.127822 )
------------------------------------------------------------
# Chi-Squared = 65.09 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 56 degrees of freedom
# Null hypothesis probability = 1.896917e-01
Photon flux (15-150 keV) in 8.16 sec: 1.00863 ( -0.123313 0.12246 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.36553e-07 ( -9.97013e-08 1.01903e-07 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 8.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.14302E-02 ( -1.26115 -0.0937468 )
beta : -2.34444 ( 2.3562 0.620144 )
Epeak [keV] : 49.7347 ( -19.4766 27.4978 )
Norm@50keV : 7.43084E-02 ( -0.0825071 118.104 )
------------------------------------------------------------
# Chi-Squared = 63.27 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Null hypothesis probability = 2.074601e-01
Photon flux (15-150 keV) in 8.16 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2186 (-1.36354 1.58315)
R^2/D10^2 : 0.249407 (-0.0902772 0.13545)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.602889e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.435e-08 1.245e-08
25- 50 2.068e-07 2.974e-08
50-150 1.879e-07 4.415e-08
15-150 4.590e-07 6.499e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 132.839 (-14.7278 -100.652)
Norm : 4.44143 (-0.55598 0.669674)
------------------------------------------------------------
# Chi-Squared = 66.56 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 57 degrees of freedom
# Null hypothesis probability = 1.811423e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.391e-08 1.442e-08
25- 50 1.709e-07 2.011e-08
50-150 3.200e-07 5.557e-08
15-150 5.848e-07 6.679e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.92097 (-2.34531 2.00155)
R1^2/D10^2 : 0.448240 (-0.185753 0.398137)
kT2 [keV] : 45.5416 (-35.7651 -56.5086)
R2^2/D10^2 : 1.31204E-03 (-0.000758932 0.0206508)
------------------------------------------------------------
# Chi-Squared = 62.39 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Null hypothesis probability = 2.300666e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.572e-08 2.648e-08
25- 50 1.982e-07 7.770e-08
50-150 2.960e-07 1.542e-07
15-150 5.699e-07 2.333e-07
Peak spectrum fit
Power-law model
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38853 ( -0.216159 0.21595 )
Norm@50keV : 2.35358E-02 ( -0.0029803 0.00297471 )
------------------------------------------------------------
# Chi-Squared = 61.14 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.297607e-01
Photon flux (15-150 keV) in 1 sec: 2.85885 ( -0.371049 0.371904 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27957e-07 ( -3.15536e-08 3.17624e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38542 ( -0.844521 1.60204 )
Epeak [keV] : 9732.27 ( -1021.78 -1021.78 )
Norm@50keV : 2.36252E-02 ( -0.0178948 0.0371436 )
------------------------------------------------------------
# Chi-Squared = 61.14 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 56 degrees of freedom
# Null hypothesis probability = 2.967096e-01
Photon flux (15-150 keV) in 1 sec: 2.86014 ( -0.3723 0.36943 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30784e-07 ( -1.84551e-07 1.0755e-07 ) ergs/cm2
Band function
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.101063 ( 0.562654 0.562654 )
beta : -1.49251 ( 1.4711 0.276658 )
Epeak [keV] : 44.2928 ( -44.2788 92.6059 )
Norm@50keV : 0.225723 ( -0.23243 738.07 )
------------------------------------------------------------
# Chi-Squared = 60.46 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.852009e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.7716 (-2.68032 3.4271)
R^2/D10^2 : 0.277811 (-0.136161 0.2531)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 80.20 using 59 PHA bins.
# Reduced chi-squared = 1.407 for 57 degrees of freedom
# Null hypothesis probability = 2.310544e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.433e-08 3.933e-09
25- 50 5.957e-08 1.173e-08
50-150 1.030e-07 2.643e-08
15-150 1.769e-07 3.355e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.997 ( )
Norm : 11.8595 (-11.8595 -11.8595)
------------------------------------------------------------
# Chi-Squared = 63.15 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.682690e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.953e-08 1.588e-08
25- 50 5.681e-08 3.068e-08
50-150 1.246e-07 6.740e-08
15-150 2.109e-07 1.145e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.95279 (-2.39381 2.71992)
R1^2/D10^2 : 1.46876 (-0.837617 1.51543)
kT2 [keV] : 46.0944 (-19.7942 -46.3662)
R2^2/D10^2 : 6.45013E-03 (-0.00594246 0.0163542)
------------------------------------------------------------
# Chi-Squared = 59.12 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 55 degrees of freedom
# Null hypothesis probability = 3.275143e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.445e-08 1.177e-08
25- 50 5.947e-08 2.914e-08
50-150 1.450e-07 7.783e-08
15-150 2.290e-07 1.053e-07
Plot creation:
Fri Sep 7 20:21:43 EDT 2012