batgrbproduct Analysis for Trigger=629302
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.
Special note:
Due to the low partial coding fraction of this burst, the light curves and burst durations
are created using the special DETECTION mask aperture. However, the spectral analysis are done using
the default FLUX aperture for more accurate results, and thus the spectral analysis is only
available after T+22.168 s when the burst came into the BAT calibrated field of view.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Mon Feb 2 11:55:40 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger629302
======================================================================
Trigger: 00629302 Segment: 000
BAT Trigger Time: 444491232.832 [s; MET]
Trigger Stop: 444491233.856 [s; MET]
UTC: 2015-02-01T13:46:59.703120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 11.8321794763577 Dec: -37.625024756673 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.54
Image Trigger?: NO
Rate S/N Ratio: 204.347742830695 [ if not an image trigger ]
Image S/N Ratio: 6.54
Flight Position: [ source = BAT ]
RA: 11.8321794763577 Dec: -37.625024756673 [deg; J2000]
Partial Coding Fraction: 0 [ including projection effects ]
Duration
T90: 26.067999958992 +/- 5.22221252722086
Measured from: -2.77200001478195
to: 23.2959999442101 [s; relative to TRIGTIME]
T50: 6.65199995040894 +/- 0.933338078754715
Measured from: -0.944000005722046
to: 5.70799994468689 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 29.6919999718666
to: 30.6919999718666 [s; relative to TRIGTIME]
Total Fluence
Measured from: 29.6759999990463
to: 49.6759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.306097 0.330476 0.127761 0.036120
0.037866 0.038716 0.033506 0.031326 [error]
Peak 0.046445 0.027866 0.035399 0.001618
0.013540 0.014246 0.011991 0.010925 [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 2.22e-07 2.50e-07 2.01e-07 2.71e-07 7.72e-07 9.43e-07 erg/cm2
Error 3.33e-08 3.41e-08 5.17e-08 1.29e-07 1.22e-07 2.02e-07 erg/cm2
Peak flux Power-law 5.20e-01 3.50e-01 1.54e-01 9.30e-02 1.07e+00 1.12e+00 ph/cm2/s
Error 2.82e-01 1.43e-01 1.36e-01 1.56e-01 3.65e-01 3.88e-01 ph/cm2/s
Fluence Cutoff-PL 2.13e-07 2.91e-07 1.64e-07 3.08e-08 6.93e-07 6.98e-07 erg/cm2
Error 3.63e-08 5.00e-08 6.91e-08 9.32e-08 1.23e-07 1.56e-07 erg/cm2
Peak flux Cutoff-PL 5.28e-01 3.48e-01 1.49e-01 8.72e-02 1.07e+00 1.11e+00 ph/cm2/s
Error 2.77e-01 1.43e-01 1.36e-01 1.55e-01 3.65e-01 3.83e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.310 0.244 - - 2.93e-03 5.58e-04 53.610 57
CPL 0.971 1.357 27.7 16.1 2.07e-02 1.06e-01 49.570 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 2.186 1.144 - - 6.51e-03 3.95e-03 74.620 57
CPL 2.258 0.000 103.6 0.0 5.03e-03 0.00e+00 74.080 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: 14.336000 sec.
T50 in the 50-300 keV band: 4.288000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 52.808 -3.328 49.480
T90 26.068 -2.772 23.296
T50 6.652 -0.944 5.708
Peak 1.000 -0.004 0.996
Image
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)
Spectral Evolution
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 averaged DRM
Power-law model
Time interval is from 22.168 sec. to 49.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.30982 ( -0.232241 0.256307 )
Norm@50keV : 2.93165E-03 ( -0.000562562 0.000553139 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.61 using 59 PHA bins.
# Reduced chi-squared = 0.9406 for 57 degrees of freedom
# Null hypothesis probability = 6.029501e-01
Photon flux (15-150 keV) in 27.51 sec: 0.515144 ( -0.0637688 0.0637828 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.72109e-07 ( -1.20209e-07 1.24313e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 22.168 sec. to 49.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.970591 ( -1.5493 1.1638 )
Epeak [keV] : 27.7310 ( -25.9024 6.28597 )
Norm@50keV : 2.07220E-02 ( -0.0207222 0.191317 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.57 using 59 PHA bins.
# Reduced chi-squared = 0.8851 for 56 degrees of freedom
# Null hypothesis probability = 7.154468e-01
Photon flux (15-150 keV) in 27.51 sec: 0.504524 ( -0.063409 0.063733 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.93291e-07 ( -1.14056e-07 1.32243e-07 ) ergs/cm2
Band function
Time interval is from 22.168 sec. to 49.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02981 ( -0.660524 5.97261 )
beta : -9.37163 ( 9.37167 19.3717 )
Epeak [keV] : 27.5725 ( -9.52983 8.43384 )
Norm@50keV : 1.88610E-02 ( -0.0188773 0.573576 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.57 using 59 PHA bins.
# Reduced chi-squared = 0.9013 for 55 degrees of freedom
# Null hypothesis probability = 6.813113e-01
Photon flux (15-150 keV) in 27.51 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] : 8.00750 (-1.02102 1.13984)
R^2/D10^2 : 0.587908 (-0.243158 0.425998)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.97 using 59 PHA bins.
# Reduced chi-squared = 0.9819 for 57 degrees of freedom
# Null hypothesis probability = 5.137913e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.877e-07 3.772e-08
25- 50 3.290e-07 6.030e-08
50-150 8.665e-08 3.349e-08
15-150 6.033e-07 1.074e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 38.9741 (-10.1215 15.4194)
Norm : 3.45610 (-0.720713 0.948983)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.78 using 59 PHA bins.
# Reduced chi-squared = 0.8734 for 57 degrees of freedom
# Null hypothesis probability = 7.400342e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.164e-07 3.239e-08
25- 50 2.815e-07 4.706e-08
50-150 2.116e-07 8.283e-08
15-150 7.095e-07 1.173e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.80717 (-2.50457 20.1742)
R1^2/D10^2 : 5.96939 (-5.20685 15.1911)
kT2 [keV] : 10.5834 (-2.4686 16.1829)
R2^2/D10^2 : 0.149879 (-0.148154 0.375079)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.70 using 59 PHA bins.
# Reduced chi-squared = 0.9036 for 55 degrees of freedom
# Null hypothesis probability = 6.766465e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.126e-07 1.126e-07
25- 50 2.937e-07 1.541e-07
50-150 1.581e-07 9.554e-08
15-150 6.644e-07 3.443e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 0.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.18551 ( -0.821072 1.46707 )
Norm@50keV : 6.51023E-03 ( -0.00459064 0.00331256 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.62 using 59 PHA bins.
# Reduced chi-squared = 1.309 for 57 degrees of freedom
# Null hypothesis probability = 5.858112e-02
Photon flux (15-150 keV) in 1 sec: 1.06968 ( -0.365345 0.365335 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1032e-08 ( -2.97979e-08 2.95836e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.25779 ( )
Epeak [keV] : 103.599 ( )
Norm@50keV : 5.02986E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.08 using 59 PHA bins.
# Reduced chi-squared = 1.323 for 56 degrees of freedom
# Null hypothesis probability = 5.318311e-02
Photon flux (15-150 keV) in 1 sec: 1.06935 ( -0.365163 0.36516 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.14057e-08 ( -3.02042e-08 2.73196e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63963 ( 1.64391 1.64391 )
beta : -2.17056 ( 2.18406 0.818072 )
Epeak [keV] : 8.39593 ( -7.7234 -7.7234 )
Norm@50keV : 2.33960E-02 ( -0.0244141 17068.1 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.62 using 59 PHA bins.
# Reduced chi-squared = 1.357 for 55 degrees of freedom
# Null hypothesis probability = 4.025653e-02
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] : 3.76334 (-1.49618 3.51604)
R^2/D10^2 : 30.3103 (-30.3469 610.239)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.74 using 59 PHA bins.
# Reduced chi-squared = 1.399 for 57 degrees of freedom
# Null hypothesis probability = 2.506807e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.035e-08 1.245e-08
25- 50 6.153e-09 4.379e-09
50-150 5.115e-11 6.470e-11
15-150 2.656e-08 1.667e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 95.7954 (-96.8453 -96.8453)
Norm : 4.49124 (-1.87718 37.1581)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.56 using 59 PHA bins.
# Reduced chi-squared = 1.343 for 57 degrees of freedom
# Null hypothesis probability = 4.296709e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.174e-08 7.325e-09
25- 50 2.011e-08 1.282e-08
50-150 3.180e-08 2.571e-08
15-150 6.365e-08 4.478e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.13980 (-1.3461 1.96978)
R1^2/D10^2 : 73.7993 (-68.2905 344.35)
kT2 [keV] : 29.2122 (-13.2308 63.7003)
R2^2/D10^2 : 8.77980E-03 (-0.00831696 0.0485608)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.07 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 55 degrees of freedom
# Null hypothesis probability = 8.291410e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.940e-08 1.114e-08
25- 50 1.037e-08 5.640e-09
50-150 4.425e-08 2.869e-08
15-150 7.402e-08 3.948e-08
Plot creation:
Mon Feb 2 12:19:55 EST 2015