batgrbproduct Analysis for Trigger=577968
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 Nov 17 18:03:54 EST 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger577968/GCN5_download_cron
======================================================================
Trigger: 00577968 Segment: 000
BAT Trigger Time: 406341256 [s; MET]
Trigger Stop: 406341257.024 [s; MET]
UTC: 2013-11-17T00:34:04.717380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 332.339311275174 Dec: -31.7223097661789 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.87
Image Trigger?: NO
Rate S/N Ratio: 11.916375287813 [ if not an image trigger ]
Image S/N Ratio: 6.87
Flight Position: [ source = BAT ]
RA: 332.339311275174 Dec: -31.7223097661789 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 332.354042132638 Dec: -31.7607811037201 [deg; J2000]
{ 22h 09m 25.0s , -31d 45' 38.8" }
+/- 1.80557193567968 [arcmin] (estimated 90% radius based on SNR)
+/- 0.815887444671049 [arcmin] (formal 1-sigma fit error)
SNR: 13.0775326971718
Angular difference between Flight and Ground position is 2.427579 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 11 +/- 3.16227766016838
Measured from: -0.99999988079071
to: 10.0000001192093 [s; relative to TRIGTIME]
T50: 4 +/- 1.4142135623731
Measured from: 1.00000011920929
to: 5.00000011920929 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0
to: 1 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1
to: 12 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.180382 0.258471 0.095778 0.002386
0.020080 0.020694 0.017673 0.015076 [error]
Peak 0.022368 0.037381 0.022756 -0.002474
0.005859 0.006059 0.005108 0.004301 [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 5.50e-08 8.44e-08 9.74e-08 2.15e-07 3.00e-07 4.52e-07 erg/cm2
Error 8.17e-09 9.00e-09 1.61e-08 6.97e-08 3.84e-08 8.72e-08 erg/cm2
Peak flux Power-law 2.50e-01 2.25e-01 1.40e-01 1.33e-01 6.71e-01 7.49e-01 ph/cm2/s
Error 7.21e-02 4.56e-02 3.98e-02 7.14e-02 1.35e-01 1.55e-01 ph/cm2/s
Fluence Cutoff-PL 4.65e-08 1.07e-07 8.20e-08 1.32e-08 2.48e-07 2.49e-07 erg/cm2
Error 9.80e-09 1.47e-08 2.41e-08 2.37e-08 3.94e-08 4.44e-08 erg/cm2
Peak flux Cutoff-PL 1.94e-01 2.74e-01 1.52e-01 2.57e-02 6.43e-01 6.46e-01 ph/cm2/s
Error 8.59e-02 6.30e-02 5.00e-02 4.72e-02 1.37e-01 1.41e-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 1.794 0.179 - - 2.51e-03 3.12e-04 58.980 57
CPL -0.399 1.406 44.0 7.4 4.86e-02 2.37e-01 45.160 56
The chi2 of BB fit is 46.70 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 1.683 0.325 - - 5.08e-03 1.14e-03 62.370 57
CPL -0.174 1.873 53.7 25.6 5.11e-02 4.10e-01 57.550 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 13.000 -1.000 12.000
T90 11.000 -1.000 10.000
T50 4.000 1.000 5.000
Peak 1.000 0.000 1.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
332.3540 -31.7608 0.0147 16.4 48.9 0.4701 13.1 TRIG_00577968
------------------------------------------
Foreground time interval of the image:
-1.000 9.601 (delta_t = 10.601 [sec])
Background time interval of the image:
-60.000 -1.000 (delta_t = 59.000 [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 -1.000 sec. to 12.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79434 ( -0.175555 0.182004 )
Norm@50keV : 2.51040E-03 ( -0.000314294 0.000310093 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.98 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 57 degrees of freedom
# Null hypothesis probability = 4.029382e-01
Photon flux (15-150 keV) in 13 sec: 0.345172 ( -0.0367958 0.0367993 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00496e-07 ( -3.80024e-08 3.88068e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.000 sec. to 12.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.398643 ( -1.65426 1.15858 )
Epeak [keV] : 43.9569 ( -5.43735 9.3908 )
Norm@50keV : 4.85564E-02 ( -0.049047 0.4256 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.16 using 59 PHA bins.
# Reduced chi-squared = 0.8064 for 56 degrees of freedom
# Null hypothesis probability = 8.496828e-01
Photon flux (15-150 keV) in 13 sec: 0.323808 ( -0.037986 0.03803 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47525e-07 ( -3.6699e-08 4.20108e-08 ) ergs/cm2
Band function
Time interval is from -1.000 sec. to 12.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.39115 ( -2.81508 1.62992 )
beta : -2.94266 ( 3.0031 0.700195 )
Epeak [keV] : 39.8166 ( -4.64072 7.52246 )
Norm@50keV : 0.213724 ( -0.209792 5.6921 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.14 using 59 PHA bins.
# Reduced chi-squared = 0.7843 for 55 degrees of freedom
# Null hypothesis probability = 8.769119e-01
Photon flux (15-150 keV) in 13 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] : 10.7094 (-1.05207 1.19802)
R^2/D10^2 : 0.134938 (-0.0446821 0.0642033)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.70 using 59 PHA bins.
# Reduced chi-squared = 0.8193 for 57 degrees of freedom
# Null hypothesis probability = 8.330476e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.179e-08 7.839e-09
25- 50 1.141e-07 1.604e-08
50-150 7.239e-08 1.808e-08
15-150 2.283e-07 2.698e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 85.6478 (-24.5701 44.4096)
Norm : 1.61684 (-0.227036 0.268901)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.90 using 59 PHA bins.
# Reduced chi-squared = 0.9105 for 57 degrees of freedom
# Null hypothesis probability = 6.663795e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.474e-08 8.216e-09
25- 50 9.157e-08 1.184e-08
50-150 1.352e-07 6.630e-08
15-150 2.815e-07 6.767e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.45577 ( )
R1^2/D10^2 : 0.187267 (-0.179959 31.8314)
kT2 [keV] : 30.3478 (-29.6576 -29.6578)
R2^2/D10^2 : 9.08969E-04 (-0.000953682 0.132596)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.75 using 59 PHA bins.
#Fit statistic : Chi-Squared = 43.47 using 59 PHA bins.
# Reduced chi-squared = 0.8318 for 55 degrees of freedom
# Reduced chi-squared = 0.7903 for 55 degrees of freedom
# Null hypothesis probability = 8.084694e-01
# Null hypothesis probability = 8.692185e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.538e-08 1.742e-08
25- 50 1.098e-07 3.758e-08
50-150 7.910e-08 2.928e-08
15-150 2.343e-07 6.669e-08
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68333 ( -0.314491 0.336125 )
Norm@50keV : 5.08473E-03 ( -0.00115493 0.00113021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.37 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.911209e-01
Photon flux (15-150 keV) in 1 sec: 0.671417 ( -0.135246 0.13529 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.71486e-08 ( -1.10032e-08 1.1351e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.173672 ( -2.25189 1.49438 )
Epeak [keV] : 53.6544 ( -12.3409 38.7666 )
Norm@50keV : 5.11497E-02 ( -0.0511521 0.767947 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.55 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 56 degrees of freedom
# Null hypothesis probability = 4.174422e-01
Photon flux (15-150 keV) in 1 sec: 0.642505 ( -0.136401 0.136759 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23998e-08 ( -1.03551e-08 1.15053e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.175596 ( -1.15771 2.76183 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 53.6285 ( -12.301 38.5793 )
Norm@50keV : 5.12898E-02 ( -0.0512898 0.769668 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.55 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 55 degrees of freedom
# Null hypothesis probability = 3.808401e-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] : 12.8873 (-2.41211 2.99228)
R^2/D10^2 : 0.138318 (-0.0740094 0.152705)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.69 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.132122e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.873e-09 1.711e-09
25- 50 1.662e-08 5.806e-09
50-150 1.737e-08 7.727e-09
15-150 3.886e-08 1.197e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 118.571 (-56.6209 -116.619)
Norm : 2.90303 (-0.626684 0.856609)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.14 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.626175e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.565e-09 4.396e-09
25- 50 1.351e-08 7.795e-09
50-150 2.396e-08 1.641e-08
15-150 4.503e-08 2.831e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.08745 (-4.0915 -4.0915)
R1^2/D10^2 : 2.75610 (-2.74522 -2.74522)
kT2 [keV] : 14.5749 (-3.48318 -14.5771)
R2^2/D10^2 : 8.11585E-02 (-0.0810839 0.149428)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.906711e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.406e-09 3.377e-09
25- 50 1.509e-08 8.630e-09
50-150 2.002e-08 1.257e-08
15-150 4.151e-08 2.264e-08
Plot creation:
Sun Nov 17 18:12:13 EST 2013