batgrbproduct Analysis for Trigger=662757
Analysis Summary
Special note:
- During this time when the CZT bias voltage is at -150v (not the normal -200v; GCN Circ. 18562),
the energy scale in the plots below and in the data from the Quicklook and HEASARC sites
is somewhat off from the proper calibration.
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sat Nov 7 22:48:31 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger662757/batgroup_hand_proc
======================================================================
Trigger: 00662757 Segment: 000
BAT Trigger Time: 468609592 [s; MET]
Trigger Stop: 468609952 [s; MET]
UTC: 2015-11-07T17:19:36.617900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 217.139076700173 Dec: -59.6797006612809 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.65
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.65
Flight Position: [ source = BAT ]
RA: 217.139076700173 Dec: -59.6797006612809 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 217.139 Dec: -59.6797 [deg; J2000]
{ 14h 28m 33.4s , -59d -40' -46.9" }
+/- 2.71791441782 [arcmin] (estimated 90% radius based on SNR)
SNR: 7.29186085434
Angular difference between Flight and Ground position is 0.002324 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 360 +/-
Measured from: 0
to: 360 [s; relative to TRIGTIME]
T50: 360 +/-
Measured from: 0
to: 360 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 360 second)
Measured from: 0
to: 360 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 360 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.800885 0.621366 0.019918 0.086457
0.102835 0.098809 0.083912 0.073445 [error]
Peak 0.800885 0.621366 0.019918 0.086457
0.102835 0.098809 0.083912 0.073445 [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 5.85e-07 6.60e-07 5.33e-07 7.18e-07 2.04e-06 2.50e-06 erg/cm2
Error 8.62e-08 8.13e-08 1.27e-07 3.25e-07 2.92e-07 4.93e-07 erg/cm2
Peak flux Power-law 1.97e-02 1.07e-02 3.60e-03 1.57e-03 3.49e-02 3.56e-02 ph/cm2/s
Error 4.20e-03 2.29e-03 1.56e-03 1.23e-03 6.32e-03 6.57e-03 ph/cm2/s
Fluence Cutoff-PL 5.28e-07 7.76e-07 4.38e-07 7.27e-08 1.81e-06 1.81e-06 erg/cm2
Error 1.01e-07 1.18e-07 1.58e-07 1.73e-07 2.87e-07 3.33e-07 erg/cm2
Peak flux Cutoff-PL 1.89e-02 1.24e-02 2.44e-03 1.08e-04 3.39e-02 3.39e-02 ph/cm2/s
Error 4.62e-03 3.15e-03 1.89e-03 1.08e-03 6.19e-03 6.21e-03 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 2.308 0.238 - - 1.86e-04 3.23e-05 63.070 57
CPL 0.714 1.330 30.6 0.0 1.73e-03 0.00e+00 57.440 56
(1-s peak spectrum is not available)
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 360.000 0.000 360.000
T90 360.000 0.000 360.000
T50 360.000 0.000 360.000
Peak 360.000 0.000 360.000
Image
Pre-slew 15.0-50.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name
217.139 -59.680 0.000 9.538 -51.058 1.393 7.292 TRIG_00662757
Image time interval: 0.000 to 360.000 [sec]
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -239.000 sec. to 909.501 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.30807 ( -0.227552 0.248636 )
Norm@50keV : 1.85748E-04 ( -3.25413e-05 3.20249e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.07 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.703229e-01
Photon flux (15-150 keV) in 1149 sec: 3.26074E-02 ( -0.00370375 0.00370375 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04257e-06 ( -2.87201e-07 2.9776e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -239.000 sec. to 909.501 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.714486 ( -1.47846 1.18148 )
Epeak [keV] : 30.5588 ( )
Norm@50keV : 1.72806E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.44 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 56 degrees of freedom
# Null hypothesis probability = 4.217649e-01
Photon flux (15-150 keV) in 1149 sec: 3.10154E-02 ( -0.0037915 0.0038193 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80506e-06 ( -2.65327e-07 3.0776e-07 ) ergs/cm2
Band function
Time interval is from -239.000 sec. to 909.501 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.729352 ( -1.15231 1.17018 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 30.4780 ( -5.60582 7.33857 )
Norm@50keV : 1.69302E-03 ( -0.00171523 0.0122069 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.44 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 55 degrees of freedom
# Null hypothesis probability = 3.850247e-01
Photon flux (15-150 keV) in 1149 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] : 8.75487 (-1.01562 1.11611)
R^2/D10^2 : 2.53331E-02 (-0.00959718 0.0159629)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.18 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.674058e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.279e-07 8.325e-08
25- 50 8.706e-07 1.336e-07
50-150 3.050e-07 1.076e-07
15-150 1.604e-06 2.488e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.6394 (-9.97796 15.0264)
Norm : 0.209550 (-0.0410353 0.0531968)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.15 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 57 degrees of freedom
# Null hypothesis probability = 4.327014e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.558e-07 8.589e-08
25- 50 7.362e-07 1.056e-07
50-150 5.795e-07 2.057e-07
15-150 1.872e-06 3.051e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.13642 (-1.21602 2.07968)
R1^2/D10^2 : 10.4777 (-10.267 64456.9)
kT2 [keV] : 9.94972 (-1.39689 2.06892)
R2^2/D10^2 : 1.39964E-02 (-0.00816856 0.012477)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.74 using 59 PHA bins.
# Reduced chi-squared = 0.9770 for 55 degrees of freedom
# Null hypothesis probability = 5.230250e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.182e-07 1.743e-07
25- 50 8.063e-07 2.023e-07
50-150 4.110e-07 1.752e-07
15-150 1.735e-06 4.491e-07
Plot creation:
Sun Nov 8 00:26:14 EST 2015