batgrbproduct Analysis for Trigger=576562
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): Mon Nov 4 16:01:05 EST 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger576562/batgroup_hand_proc
======================================================================
Trigger: 00576562 Segment: 000
BAT Trigger Time: 405209257.024 [s; MET]
Trigger Stop: 405209258.048 [s; MET]
UTC: 2013-11-03T22:07:25.793680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 348.954137003544 Dec: -44.6701123249379 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: NO
Rate S/N Ratio: 13.4164078649987 [ if not an image trigger ]
Image S/N Ratio: 7.39
Flight Position: [ source = BAT ]
RA: 348.954137003544 Dec: -44.6701123249379 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 348.947741008029 Dec: -44.6450922289237 [deg; J2000]
{ 23h 15m 47.5s , -44d 38' 42.3" }
+/- 1.83655933070618 [arcmin] (estimated 90% radius based on SNR)
+/- 0.87433426293384 [arcmin] (formal 1-sigma fit error)
SNR: 12.7634603309554
Angular difference between Flight and Ground position is 1.525823 arcmin
Partial Coding Fraction: 0.3007812 [ including projection effects ]
Duration
T90: 17.3120000362396 +/- 4.83467473486546
Measured from: -8.24799996614456
to: 9.06400007009506 [s; relative to TRIGTIME]
T50: 6.91200000047684 +/- 2.33034933939632
Measured from: -3.1599999666214
to: 3.75200003385544 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.620000004768372
to: 1.62000000476837 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.49599999189377
to: 13.4639999866486 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.573470 0.506024 0.355738 -0.021273
0.050968 0.050292 0.044468 0.039471 [error]
Peak 0.039236 0.079961 0.054924 0.005277
0.011085 0.012035 0.010739 0.007971 [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 1.76e-07 2.43e-07 2.49e-07 4.65e-07 8.17e-07 1.13e-06 erg/cm2
Error 2.58e-08 2.49e-08 4.34e-08 1.61e-07 9.98e-08 2.08e-07 erg/cm2
Peak flux Power-law 4.73e-01 4.97e-01 3.70e-01 4.44e-01 1.51e+00 1.78e+00 ph/cm2/s
Error 1.44e-01 9.93e-02 8.14e-02 1.90e-01 2.85e-01 3.35e-01 ph/cm2/s
Fluence Cutoff-PL 1.68e-07 2.57e-07 2.47e-07 7.84e-07 0.00e+00 0.00e+00 erg/cm2
Error 2.86e-08 3.21e-08 4.72e-08 1.10e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.03e-01 5.57e-01 4.03e-01 1.63e-01 1.48e+00 1.53e+00 ph/cm2/s
Error 1.61e-01 1.27e-01 9.85e-02 2.17e-01 2.87e-01 3.48e-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 1.966 0.193 - - 3.86e-03 4.89e-04 61.940 57
CPL 1.529 0.668 46.6 -5.0 6.82e-03 7.72e-03 60.690 56
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.428 0.286 - - 1.23e-02 2.30e-03 58.840 57
CPL 0.394 1.328 76.3 -25.8 4.24e-02 1.40e-01 56.290 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: 7.872000 sec.
T50 in the 50-300 keV band: 2.496000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 22.960 -9.496 13.464
T90 17.312 -8.248 9.064
T50 6.912 -3.160 3.752
Peak 1.000 0.620 1.620
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
348.9477 -44.6451 0.0151 33.0046 118.9165 1.4054080 12.763 TRIG_00576562
Foreground time interval of the image:
-9.496 12.277 (delta_t = 21.773 [sec])
Background time interval of the image:
-60.024 -9.496 (delta_t = 50.528 [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 -9.496 sec. to 13.464 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96615 ( -0.187751 0.19743 )
Norm@50keV : 3.86336E-03 ( -0.000494554 0.000483398 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.94 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.044646e-01
Photon flux (15-150 keV) in 22.96 sec: 0.570668 ( -0.0583454 0.0583667 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.16751e-07 ( -9.88779e-08 1.00784e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.496 sec. to 13.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52881 ( -0.778135 0.557279 )
Epeak [keV] : 46.5905 ( -36.5099 -46.5905 )
Norm@50keV : 6.82410E-03 ( -0.00372414 0.011725 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.69 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 56 degrees of freedom
# Null hypothesis probability = 3.106567e-01
Photon flux (15-150 keV) in 22.96 sec: 0.560932 ( -0.060059 0.060079 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.84371e-07 ( -1.07751e-07 1.11629e-07 ) ergs/cm2
Band function
Time interval is from -9.496 sec. to 13.464 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52808 ( -4.67859 0.897706 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 46.5679 ( -31.0832 -46.5679 )
Norm@50keV : 6.82980E-03 ( -0.00328187 0.0117238 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.69 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 55 degrees of freedom
# Null hypothesis probability = 2.782730e-01
Photon flux (15-150 keV) in 22.96 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] : 10.5494 (-1.41483 1.60927)
R^2/D10^2 : 0.212772 (-0.0879833 0.154758)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.01 using 59 PHA bins.
# Reduced chi-squared = 1.509 for 57 degrees of freedom
# Null hypothesis probability = 7.805877e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.125e-07 2.206e-08
25- 50 3.011e-07 4.305e-08
50-150 1.831e-07 5.037e-08
15-150 5.968e-07 7.806e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 72.5488 (-20.4161 34.1225)
Norm : 2.76216 (-0.423885 0.517209)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.96 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.353828e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.633e-07 2.157e-08
25- 50 2.623e-07 2.824e-08
50-150 3.458e-07 1.041e-07
15-150 7.714e-07 1.317e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.87775 (-1.11238 1.4029)
R1^2/D10^2 : 2.87836 (-1.80961 4.77633)
kT2 [keV] : 18.0643 (-3.6934 5.78044)
R2^2/D10^2 : 2.16506E-02 (-0.0143826 0.0234468)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.94 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 55 degrees of freedom
# Null hypothesis probability = 3.674264e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.779e-07 8.793e-08
25- 50 2.397e-07 9.876e-08
50-150 3.599e-07 1.983e-07
15-150 7.774e-07 3.019e-07
Peak spectrum fit
Power-law model
Time interval is from 0.620 sec. to 1.620 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42828 ( -0.285669 0.286671 )
Norm@50keV : 1.23221E-02 ( -0.002305 0.00229773 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.84 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 57 degrees of freedom
# Null hypothesis probability = 4.077986e-01
Photon flux (15-150 keV) in 1 sec: 1.51048 ( -0.285039 0.285786 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18403e-07 ( -2.37484e-08 2.40223e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.620 sec. to 1.620 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.393600 ( -1.5531 1.10311 )
Epeak [keV] : 76.3114 ( -24.6557 -76.3099 )
Norm@50keV : 4.23834E-02 ( -0.042389 0.238429 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.29 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 56 degrees of freedom
# Null hypothesis probability = 4.638863e-01
Photon flux (15-150 keV) in 1 sec: 1.47750 ( -0.2868 0.28787 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1156e-07 ( -2.58081e-08 2.5777e-08 ) ergs/cm2
Band function
Time interval is from 0.620 sec. to 1.620 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.395124 ( -0.799748 1.25888 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 76.3221 ( -22.2087 291.774 )
Norm@50keV : 4.23209E-02 ( -0.0423209 0.23861 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.29 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 55 degrees of freedom
# Null hypothesis probability = 4.262987e-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] : 14.5781 (-2.98063 4.04633)
R^2/D10^2 : 0.201821 (-0.116932 0.250743)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.25 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 57 degrees of freedom
# Null hypothesis probability = 3.590695e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.018e-09 3.270e-09
25- 50 3.489e-08 1.054e-08
50-150 4.980e-08 2.056e-08
15-150 9.371e-08 2.592e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-92.8222 -199.363)
Norm : 6.30812 (-1.15922 1.1592)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.01 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.379456e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.571e-08 8.935e-09
25- 50 3.022e-08 1.770e-08
50-150 6.627e-08 3.714e-08
15-150 1.122e-07 6.480e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.72296 (-3.31059 4.68779)
R1^2/D10^2 : 0.785813 (-0.564122 1.30911)
kT2 [keV] : 28.5600 (-22.8844 -28.3928)
R2^2/D10^2 : 1.30621E-02 (-0.0131865 0.0887219)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.58 using 59 PHA bins.
# Reduced chi-squared = 0.9924 for 55 degrees of freedom
# Null hypothesis probability = 4.904689e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.316e-08 7.950e-09
25- 50 3.352e-08 1.957e-08
50-150 6.885e-08 3.972e-08
15-150 1.155e-07 5.985e-08
Plot creation:
Mon Nov 4 16:46:18 EST 2013