batgrbproduct Analysis for Trigger=536897
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): Sun Oct 28 19:09:28 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger536897/batgroup_hand_proc
======================================================================
Trigger: 00536897 Segment: 000
BAT Trigger Time: 373093481.728 [s; MET]
Trigger Stop: 373093482.24 [s; MET]
UTC: 2012-10-28T05:04:31.919360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 271.923328992952 Dec: -2.28481991403425 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.54
Image Trigger?: NO
Rate S/N Ratio: 11.6619037896906 [ if not an image trigger ]
Image S/N Ratio: 9.54
Flight Position: [ source = BAT ]
RA: 271.923328992952 Dec: -2.28481991403425 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 271.903025723604 Dec: -2.29781373618105 [deg; J2000]
{ 18h 07m 36.7s , -02d 17' 52.1" }
+/- 1.49742703431222 [arcmin] (estimated 90% radius based on SNR)
+/- 0.550093428561159 [arcmin] (formal 1-sigma fit error)
SNR: 17.0853770045683
Angular difference between Flight and Ground position is 1.445494 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 3.83999997377396 +/- 0.715541763462338
Measured from: -0.567999839782715
to: 3.27200013399124 [s; relative to TRIGTIME]
T50: 1.79200005531311 +/- 0.271529048482706
Measured from: 0.264000117778778
to: 2.05600017309189 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0119999647140503
to: 0.98800003528595 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.824000000953674
to: 3.84799998998642 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.165900 0.254977 0.139747 0.037135
0.019599 0.020031 0.016967 0.013995 [error]
Peak 0.060316 0.102347 0.031289 0.010602
0.009646 0.009878 0.008127 0.006492 [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 6.79e-08 1.05e-07 1.21e-07 2.69e-07 3.73e-07 5.62e-07 erg/cm2
Error 1.01e-08 1.00e-08 1.66e-08 7.55e-08 3.95e-08 9.10e-08 erg/cm2
Peak flux Power-law 8.42e-01 6.44e-01 3.30e-01 2.43e-01 1.93e+00 2.06e+00 ph/cm2/s
Error 1.61e-01 8.61e-02 6.75e-02 9.38e-02 2.60e-01 2.76e-01 ph/cm2/s
Fluence Cutoff-PL 6.38e-08 1.11e-07 1.23e-07 1.25e-07 4.23e-07 0.00e+00 erg/cm2
Error 1.15e-08 1.33e-08 1.81e-08 1.35e-07 1.44e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.40e-01 7.75e-01 2.95e-01 3.21e-02 1.84e+00 1.84e+00 ph/cm2/s
Error 1.94e-01 1.51e-01 1.07e-01 1.01e-01 2.76e-01 2.85e-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 1.790 0.166 - - 8.66e-03 8.96e-04 42.280 57
CPL 1.288 0.702 65.5 -24.8 1.62e-02 1.77e-02 40.680 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.965 0.232 - - 1.31e-02 2.07e-03 70.150 57
CPL 0.284 2.030 40.0 14.6 1.32e-01 2.34e+00 66.750 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: 2.560000 sec.
T50 in the 50-300 keV band: 1.600000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 4.672 -0.824 3.848
T90 3.840 -0.568 3.272
T50 1.792 0.264 2.056
Peak 1.000 -0.012 0.988
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.9030 -2.2978 0.0113 40.1605 -153.9296 0.6313712 17.085 TRIG_00536897
Foreground time interval of the image:
-0.824 3.848 (delta_t = 4.672 [sec])
Background time interval of the image:
-60.728 -0.824 (delta_t = 59.904 [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 -0.824 sec. to 3.848 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79037 ( -0.163569 0.168054 )
Norm@50keV : 8.66184E-03 ( -0.000901084 0.000890034 )
------------------------------------------------------------
# Chi-Squared = 42.28 using 59 PHA bins.
# Reduced chi-squared = 0.7417 for 57 degrees of freedom
# Null hypothesis probability = 9.272810e-01
Photon flux (15-150 keV) in 4.672 sec: 1.18915 ( -0.115515 0.115696 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.72685e-07 ( -3.93566e-08 3.96956e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.824 sec. to 3.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28776 ( -0.798958 0.605774 )
Epeak [keV] : 65.5368 ( -15.8618 -65.5419 )
Norm@50keV : 1.61766E-02 ( -0.00808244 0.0272622 )
------------------------------------------------------------
# Chi-Squared = 40.68 using 59 PHA bins.
# Reduced chi-squared = 0.7265 for 56 degrees of freedom
# Null hypothesis probability = 9.382990e-01
Photon flux (15-150 keV) in 4.672 sec: 1.16665 ( -0.11974 0.11957 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22599e-07 ( -9.01201e-08 1.98029e-07 ) ergs/cm2
Band function
Time interval is from -0.824 sec. to 3.848 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.500031 ( -1.3635 0.482086 )
beta : -2.05182 ( 2.05253 0.309632 )
Epeak [keV] : 42.4626 ( -18.3754 60.1142 )
Norm@50keV : 5.31446E-02 ( -0.0587691 670.584 )
------------------------------------------------------------
# Chi-Squared = 39.35 using 59 PHA bins.
# Reduced chi-squared = 0.7154 for 55 degrees of freedom
# Null hypothesis probability = 9.450014e-01
Photon flux (15-150 keV) in 4.672 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] : 11.7860 (-1.29502 1.48507)
R^2/D10^2 : 0.307240 (-0.110479 0.168691)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 61.84 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.075064e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.210e-08 7.615e-09
25- 50 1.297e-07 1.446e-08
50-150 1.070e-07 2.252e-08
15-150 2.788e-07 3.378e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 102.749 (-26.1276 58.6193)
Norm : 5.24090 (-0.678606 0.78143)
------------------------------------------------------------
# Chi-Squared = 40.63 using 59 PHA bins.
# Reduced chi-squared = 0.7128 for 57 degrees of freedom
# Null hypothesis probability = 9.502067e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.400e-08 8.106e-09
25- 50 1.113e-07 1.224e-08
50-150 1.831e-07 3.380e-08
15-150 3.583e-07 3.931e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.98660 (-1.98772 1.94272)
R1^2/D10^2 : 0.996443 (-0.497563 1.44713)
kT2 [keV] : 29.6069 (-10.9253 58.1107)
R2^2/D10^2 : 6.56209E-03 (-0.00616112 0.0328436)
------------------------------------------------------------
# Chi-Squared = 39.72 using 59 PHA bins.
# Reduced chi-squared = 0.7222 for 55 degrees of freedom
# Null hypothesis probability = 9.398414e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.787e-08 1.886e-08
25- 50 1.196e-07 3.946e-08
50-150 1.863e-07 9.412e-08
15-150 3.637e-07 1.338e-07
Peak spectrum fit
Power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96523 ( -0.225612 0.23881 )
Norm@50keV : 1.30606E-02 ( -0.00209261 0.00204503 )
------------------------------------------------------------
# Chi-Squared = 70.15 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 57 degrees of freedom
# Null hypothesis probability = 1.132480e-01
Photon flux (15-150 keV) in 1 sec: 1.92842 ( -0.259848 0.260027 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20255e-07 ( -1.83248e-08 1.86286e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.283832 ( -2.49856 1.56167 )
Epeak [keV] : 40.0263 ( -10.1192 19.0997 )
Norm@50keV : 0.132463 ( -0.135567 4.55255 )
------------------------------------------------------------
# Chi-Squared = 66.75 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 56 degrees of freedom
# Null hypothesis probability = 1.541031e-01
Photon flux (15-150 keV) in 1 sec: 1.83871 ( -0.27619 0.27568 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03119e-07 ( -2.0057e-08 2.4147e-08 ) ergs/cm2
Band function
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.874451 ( -1.91852 -0.899716 )
beta : -2.74505 ( -1.4113 0.631426 )
Epeak [keV] : 35.9040 ( -8.16789 8.37164 )
Norm@50keV : 0.779977 ( -0.897509 220.2 )
------------------------------------------------------------
# Chi-Squared = 63.31 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 55 degrees of freedom
# Null hypothesis probability = 2.064851e-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] : 9.68124 (-1.1956 1.38767)
R^2/D10^2 : 1.07345 (-0.439533 0.716741)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 68.58 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 57 degrees of freedom
# Null hypothesis probability = 1.399304e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.025e-08 4.350e-09
25- 50 4.806e-08 8.945e-09
50-150 2.282e-08 8.175e-09
15-150 9.112e-08 1.583e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 65.9488 (-20.903 38.5649)
Norm : 9.85135 (-1.96477 2.40091)
------------------------------------------------------------
# Chi-Squared = 67.71 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 57 degrees of freedom
# Null hypothesis probability = 1.568124e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.510e-08 4.615e-09
25- 50 3.928e-08 6.085e-09
50-150 4.822e-08 1.630e-08
15-150 1.126e-07 1.964e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.78016 (-1.37755 1.18878)
R1^2/D10^2 : 1.46994 (-0.469674 1.1178)
kT2 [keV] : 197.220 ( )
R2^2/D10^2 : 1.35113E-04 (-6.76905e-05 0.00471526)
------------------------------------------------------------
# Chi-Squared = 59.62 using 59 PHA bins.
# Chi-Squared = 59.23 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 55 degrees of freedom
# Reduced chi-squared = 1.077 for 55 degrees of freedom
# Null hypothesis probability = 3.113583e-01
# Null hypothesis probability = 3.241218e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.209e-08 6.770e-09
25- 50 4.571e-08 1.273e-08
50-150 5.168e-08 2.717e-08
15-150 1.195e-07 3.943e-08
Plot creation:
Sun Oct 28 19:23:56 EDT 2012