batgrbproduct Analysis for Trigger=536831
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): Sat Oct 27 09:15:46 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger536831/GCN5_download_cron
======================================================================
Trigger: 00536831 Segment: 000
BAT Trigger Time: 373015959.552 [s; MET]
Trigger Stop: 373015960.576 [s; MET]
UTC: 2012-10-27T07:32:29.746680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 63.6104836572932 Dec: -58.8014814868824 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.88
Image Trigger?: NO
Rate S/N Ratio: 13.8202749610853 [ if not an image trigger ]
Image S/N Ratio: 7.88
Flight Position: [ source = BAT ]
RA: 63.6104836572932 Dec: -58.8014814868824 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 63.5981002954236 Dec: -58.8392465645158 [deg; J2000]
{ 04h 14m 23.5s , -58d 50' 21.3" }
+/- 0.981441155503179 [arcmin] (estimated 90% radius based on SNR)
+/- 0.376433820046457 [arcmin] (formal 1-sigma fit error)
SNR: 31.2421460052675
Angular difference between Flight and Ground position is 2.298324 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 62.0479999184608 +/- 4.82005846681452
Measured from: -5.01599985361099
to: 57.0320000648499 [s; relative to TRIGTIME]
T50: 24.2159999608994 +/- 5.20054496820753
Measured from: 2.48000013828278
to: 26.6960000991821 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2
to: 3 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.33999997377396
to: 65.3320000171661 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.204145 1.329788 0.861451 0.169618
0.049663 0.051288 0.044935 0.037997 [error]
Peak 0.058204 0.057859 0.035330 0.013260
0.006493 0.006802 0.006067 0.004819 [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 3.70e-07 5.60e-07 6.37e-07 1.38e-06 1.98e-06 2.95e-06 erg/cm2
Error 2.89e-08 2.64e-08 4.49e-08 2.06e-07 1.03e-07 2.43e-07 erg/cm2
Peak flux Power-law 4.76e-01 4.34e-01 2.73e-01 2.63e-01 1.29e+00 1.45e+00 ph/cm2/s
Error 9.85e-02 5.49e-02 5.15e-02 1.01e-01 1.62e-01 1.85e-01 ph/cm2/s
Fluence Cutoff-PL 3.47e-07 5.81e-07 6.42e-07 7.68e-07 2.34e-06 0.00e+00 erg/cm2
Error 3.49e-08 3.20e-08 4.75e-08 4.11e-07 4.30e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.77e-01 4.34e-01 2.73e-01 2.61e-01 1.29e+00 1.44e+00 ph/cm2/s
Error 9.86e-02 5.47e-02 5.15e-02 1.01e-01 1.61e-01 1.85e-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 1.816 0.090 - - 2.88e-03 1.47e-04 64.280 57
CPL 1.431 0.362 70.3 86.3 4.56e-03 2.02e-03 60.660 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.668 0.243 - - 9.85e-03 1.38e-03 57.590 57
CPL 1.683 0.243 9999.4 0.0 9.75e-03 0.00e+00 57.610 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: 23.936000 sec.
T50 in the 50-300 keV band: 11.072000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 74.672 -9.340 65.332
T90 62.048 -5.016 57.032
T50 24.216 2.480 26.696
Peak 1.000 2.000 3.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
63.5981 -58.8392 0.0061 23.7 156.4 2.0181 31.2 TRIG_00536831
------------------------------------------
Foreground time interval of the image:
-9.340 11.449 (delta_t = 20.789 [sec])
Background time interval of the image:
-60.552 -9.340 (delta_t = 51.212 [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 -9.340 sec. to 65.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81597 ( -0.0890414 0.0903558 )
Norm@50keV : 2.87995E-03 ( -0.000147285 0.000146244 )
------------------------------------------------------------
# Chi-Squared = 64.28 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.367501e-01
Photon flux (15-150 keV) in 74.67 sec: 0.399335 ( -0.019232 0.0192717 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97872e-06 ( -1.02694e-07 1.03362e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.340 sec. to 65.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43127 ( -0.376552 0.347145 )
Epeak [keV] : 70.3126 ( -15.3887 157.302 )
Norm@50keV : 4.55852E-03 ( -0.00151113 0.0025204 )
------------------------------------------------------------
# Chi-Squared = 60.66 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 56 degrees of freedom
# Null hypothesis probability = 3.115015e-01
Photon flux (15-150 keV) in 74.67 sec: 0.389494 ( -0.021044 0.021063 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33822e-06 ( -3.22335e-07 5.37071e-07 ) ergs/cm2
Band function
Time interval is from -9.340 sec. to 65.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.97974 ( -0.324763 0.303312 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 3.74038 ( )
Norm@50keV : 1.35339E-19 ( )
------------------------------------------------------------
# Chi-Squared = 426.54 using 59 PHA bins.
# Reduced chi-squared = 7.7553 for 55 degrees of freedom
# Null hypothesis probability = 6.790586e-59
Photon flux (15-150 keV) in 74.67 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] : 12.6909 ( )
R^2/D10^2 : 7.46005E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 156.50 using 59 PHA bins.
# Reduced chi-squared = 2.7455 for 57 degrees of freedom
# Null hypothesis probability = 3.257451e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.903e-07 1.646e-08
25- 50 6.383e-07 3.722e-08
50-150 6.407e-07 7.168e-08
15-150 1.469e-06 7.467e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 102.551 (-14.5997 26.5153)
Norm : 1.72980 (-0.11807 0.128731)
------------------------------------------------------------
# Chi-Squared = 61.16 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.289556e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.376e-07 2.311e-08
25- 50 5.867e-07 2.886e-08
50-150 9.643e-07 1.202e-07
15-150 1.889e-06 1.419e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.15110 (-0.772285 0.902233)
R1^2/D10^2 : 1.39034 (-0.654504 1.39313)
kT2 [keV] : 18.9068 (-1.96375 2.57838)
R2^2/D10^2 : 1.40879E-02 (-0.00562035 0.00773856)
------------------------------------------------------------
# Chi-Squared = 58.05 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.636849e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.580e-07 7.168e-08
25- 50 5.544e-07 6.257e-08
50-150 9.408e-07 1.390e-07
15-150 1.853e-06 2.255e-07
Peak spectrum fit
Power-law model
Time interval is from 2.000 sec. to 3.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66752 ( -0.239121 0.246223 )
Norm@50keV : 9.84668E-03 ( -0.00140382 0.00136353 )
------------------------------------------------------------
# Chi-Squared = 57.59 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.531983e-01
Photon flux (15-150 keV) in 1 sec: 1.29326 ( -0.161663 0.161765 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.14229e-08 ( -1.37345e-08 1.40039e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.000 sec. to 3.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68341 ( -0.253819 0.232561 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 9.75079E-03 ( )
------------------------------------------------------------
# Chi-Squared = 57.61 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 56 degrees of freedom
# Null hypothesis probability = 4.152998e-01
Photon flux (15-150 keV) in 1 sec: 1.29300 ( -0.1606 0.16122 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46566e-07 ( -5.38892e-08 4.0674e-08 ) ergs/cm2
Band function
Time interval is from 2.000 sec. to 3.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99485 ( -372.863 -372.863 )
beta : -1.68341 ( -0.262188 0.246632 )
Epeak [keV] : 18.6381 ( -18.6063 6.05859 )
Norm@50keV : 7773.07 ( -7884.63 7.81014e+06 )
------------------------------------------------------------
# Chi-Squared = 57.57 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 55 degrees of freedom
# Null hypothesis probability = 3.803713e-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] : 10.4963 (-1.67259 2.26377)
R^2/D10^2 : 0.488102 (-0.251139 0.449864)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 84.54 using 59 PHA bins.
# Reduced chi-squared = 1.483 for 57 degrees of freedom
# Null hypothesis probability = 1.037404e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.111e-08 2.649e-09
25- 50 2.955e-08 5.190e-09
50-150 1.771e-08 5.790e-09
15-150 5.837e-08 1.175e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 154.975 ( )
Norm : 5.27051 (-0.738355 0.918622)
------------------------------------------------------------
# Chi-Squared = 60.53 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.497459e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.290e-08 7.030e-09
25- 50 2.477e-08 1.344e-08
50-150 5.414e-08 2.921e-08
15-150 9.181e-08 4.934e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.49224 (-1.64629 1.63534)
R1^2/D10^2 : 1.46469 (-0.791152 1.06992)
kT2 [keV] : 67.3005 (-35.933 -67.3535)
R2^2/D10^2 : 1.20342E-03 (-0.00105296 0.00558517)
------------------------------------------------------------
# Chi-Squared = 53.98 using 59 PHA bins.
# Reduced chi-squared = 0.9815 for 55 degrees of freedom
# Null hypothesis probability = 5.134544e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.457e-08 4.624e-09
25- 50 2.553e-08 9.099e-09
50-150 6.070e-08 3.123e-08
15-150 1.008e-07 3.968e-08
Plot creation:
Sat Oct 27 09:25:54 EDT 2012