Analysis for Ground-detected GRB: Trigger=703769
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This is a special analysis for ground-detected GRB. The event data duration is likely to be shorter than the burst duration. In such cases, the burst durations are found using the quad-rate data, and spectral analyses are only available for event data range.
- 3) Some mask-weighted light curve plots might be missing because the time range is not completely covered by the event data range.
==========================================================================
BAT GROUND-DETECTED GRB DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Sun Jul 10 22:56:32 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================
Trigger: 00703769 Segment: 000
BAT Trigger Time: 489786560.0
UTC: 2016-07-09T19:49:03.464 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst is the T100 start time.
Analysis Position: [ source = GCN ]
RA: 236.0009 Dec: -28.186 [deg; J2000]
Refined Position: [ source = BAT pre-slew image ]
RA: 235.996320107 Dec: -28.1883821299 [deg; J2000]
{ 15h 43m 59.1s , -28d -11' -18.2" }
+/- 2.38600902192 [arcmin] (estimated 90% radius based on SNR)
SNR: 8.78301557104
Angular difference between the GCN position (ra=236.0009, dec=-28.186 deg) and this refined position is 0.281 arcmin
Partial Coding Fraction: 0.1953125 [ including projection effects ]
Duration
T90: 4.80000001192093 +/- 1.6
Measured from: 0
to: 4.8 [s; relative to TRIGTIME]
T50: 3.20000004768372 +/- 1.6
Measured from: 0
to: 3.2 [s; relative to TRIGTIME]
=== 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 3.85e-08 9.02e-08 1.68e-07 7.49e-07 4.55e-07 1.05e-06 erg/cm2
Error 1.27e-08 1.75e-08 2.71e-08 2.90e-07 7.06e-08 2.99e-07 erg/cm2
Peak flux Power-law 5.92e-01 8.05e-01 8.07e-01 1.46e+00 2.68e+00 3.67e+00 ph/cm2/s
Error 2.08e-01 1.71e-01 1.34e-01 5.47e-01 4.47e-01 6.20e-01 ph/cm2/s
Fluence Cutoff-PL 3.36e-08 9.12e-08 1.76e-07 4.59e-07 4.47e-07 8.30e-07 erg/cm2
Error 1.66e-08 1.88e-08 3.43e-08 3.24e-07 7.41e-08 3.50e-07 erg/cm2
Peak flux Cutoff-PL 5.43e-01 8.14e-01 8.36e-01 1.09e+00 2.64e+00 3.29e+00 ph/cm2/s
Error 2.57e-01 1.81e-01 1.68e-01 8.03e-01 4.67e-01 9.32e-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 1.106 0.277 - - 9.08e-03 1.40e-03 43.910 57
CPL 0.659 1.071 184.1 0.0 1.38e-02 2.10e-02 43.460 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.996 0.290 - - 2.33e-02 3.79e-03 52.380 57
CPL 0.694 1.030 254.8 0.0 3.14e-02 5.59e-02 52.200 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
=== Table of the duration information ==
Value tstart tstop
T100 4.800 0.000 4.800
T90 4.800 0.000 4.800
T50 3.200 0.000 3.200
Peak 1.000 0.300 1.300
Image
15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name
235.996 -28.188 0.022 35.819 -94.347 0.783 8.783 TRIG_00703769
Image time interval: -2.000 to 8.086 [sec]
Lightcurves
Notes:
- 1) The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
- 2) 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 (for the best duration plot, slew times are marked by green arrows).
- 3) For lightcurves in unit of count rate, time of each bin is in the middle of the bin.
Best duration plot
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 pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 4.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10593 ( -0.282394 0.270646 )
Norm@50keV : 9.07738E-03 ( -0.00140522 0.00138963 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.91 using 59 PHA bins.
# Reduced chi-squared = 0.7703 for 57 degrees of freedom
# Null hypothesis probability = 8.982000e-01
Photon flux (15-150 keV) in 4.8 sec: 1.05353 ( -0.170603 0.17271 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.54738e-07 ( -7.04198e-08 7.07117e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.658941 ( -1.46322 0.67964 )
Epeak [keV] : 184.085 ( -184.066 -184.066 )
Norm@50keV : 1.38447E-02 ( -0.00595223 0.0359869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.46 using 59 PHA bins.
# Reduced chi-squared = 0.7761 for 56 degrees of freedom
# Null hypothesis probability = 8.892216e-01
Photon flux (15-150 keV) in 4.8 sec: 1.02476 ( -0.186163 0.18662 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47055e-07 ( -7.46453e-08 7.35173e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.743111 ( 0.823333 0.823333 )
beta : -9.37166 ( 9.35977 19.3542 )
Epeak [keV] : 207.164 ( -93.756 -207.246 )
Norm@50keV : 1.29314E-02 ( -0.00356181 0.0192506 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.48 using 59 PHA bins.
# Reduced chi-squared = 0.7905 for 55 degrees of freedom
# Null hypothesis probability = 8.689737e-01
Photon flux (15-150 keV) in 4.8 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] : 22.6159 (-3.91595 5.25402)
R^2/D10^2 : 3.33740E-02 (-0.0162627 0.0288574)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.97 using 59 PHA bins.
# Reduced chi-squared = 0.8416 for 57 degrees of freedom
# Null hypothesis probability = 7.972220e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.497e-08 4.903e-09
25- 50 8.044e-08 2.088e-08
50-150 3.075e-07 8.998e-08
15-150 4.029e-07 1.084e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-42.1333 -200)
Norm : 4.53326 (-0.695662 0.695662)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.92 using 59 PHA bins.
# Reduced chi-squared = 0.9109 for 57 degrees of freedom
# Null hypothesis probability = 6.655282e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.423e-08 3.115e-08
25- 50 1.043e-07 5.904e-08
50-150 2.288e-07 1.288e-07
15-150 3.873e-07 2.157e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.81134 (-1.90799 7.1483)
R1^2/D10^2 : 9.16124 (-9.01048 611.095)
kT2 [keV] : 25.4626 (-4.98045 10.7874)
R2^2/D10^2 : 2.18706E-02 (-0.0156389 0.0229305)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.98 using 59 PHA bins.
# Reduced chi-squared = 0.7632 for 55 degrees of freedom
# Null hypothesis probability = 9.016353e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.320e-08 2.361e-08
25- 50 7.692e-08 2.696e-08
50-150 3.215e-07 1.182e-07
15-150 4.416e-07 1.450e-07
Peak spectrum fit
Power-law model
Time interval is from 0.300 sec. to 1.300 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.995766 ( -0.298377 0.282064 )
Norm@50keV : 2.32534E-02 ( -0.00380923 0.0037611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.38 using 59 PHA bins.
# Reduced chi-squared = 0.9190 for 57 degrees of freedom
# Null hypothesis probability = 6.486212e-01
Photon flux (15-150 keV) in 1 sec: 2.67655 ( -0.44515 0.44866 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51855e-07 ( -4.18402e-08 4.20927e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.300 sec. to 1.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.693966 ( -1.50312 0.556996 )
Epeak [keV] : 254.757 ( -254.751 -254.751 )
Norm@50keV : 3.14047E-02 ( -0.0115247 0.100352 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.20 using 59 PHA bins.
# Reduced chi-squared = 0.9321 for 56 degrees of freedom
# Null hypothesis probability = 6.194851e-01
Photon flux (15-150 keV) in 1 sec: 2.63830 ( -0.47081 0.46398 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48353e-07 ( -4.55661e-08 4.4069e-08 ) ergs/cm2
Band function
Time interval is from 0.300 sec. to 1.300 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.117449 ( 0.801248 0.801248 )
beta : -1.21600 ( 1.22356 0.499714 )
Epeak [keV] : 106.184 ( -108.261 234.701 )
Norm@50keV : 6.19213E-02 ( -0.037374 1201.66 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.95 using 59 PHA bins.
# Reduced chi-squared = 0.9446 for 55 degrees of freedom
# Null hypothesis probability = 5.917982e-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] : 21.9822 (-4.14044 5.98958)
R^2/D10^2 : 9.56187E-02 (-0.0508759 0.0926179)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.87 using 59 PHA bins.
# Reduced chi-squared = 0.9978 for 57 degrees of freedom
# Null hypothesis probability = 4.798187e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.554e-09 3.180e-09
25- 50 4.521e-08 1.368e-08
50-150 1.632e-07 4.861e-08
15-150 2.170e-07 5.785e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-41.7917 -200)
Norm : 11.2290 (-1.8488 1.8488)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.05 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.710107e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.796e-08 1.595e-08
25- 50 5.379e-08 3.089e-08
50-150 1.180e-07 6.665e-08
15-150 1.997e-07 1.127e-07
Double BB
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.03 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.01 using 59 PHA bins.
# Reduced chi-squared = 0.9785 for 55 degrees of freedom
# Reduced chi-squared = 0.9568 for 55 degrees of freedom
# Reduced chi-squared = 0.9555 for 55 degrees of freedom
# Reduced chi-squared = 0.9460 for 55 degrees of freedom
# Reduced chi-squared = 0.9456 for 55 degrees of freedom
# Null hypothesis probability = 5.198292e-01
# Null hypothesis probability = 5.660093e-01
# Null hypothesis probability = 5.686426e-01
# Null hypothesis probability = 5.888110e-01
# Null hypothesis probability = 5.896767e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.854e-08 1.002e-08
25- 50 4.168e-08 1.595e-08
50-150 1.733e-07 6.414e-08
15-150 2.335e-07 1.008e-07
Webpage updated on:
Mon Jul 11 16:36:01 EDT 2016