Analysis Summary
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 GROUND-DETECTED GRB DATA PROCESSING REPORT
(This burst occurred during telescope slew)
Process Script Ver: batgrbproduct v2.46
Process Start Time: Tue Jun 14 15:04:59 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/GRB160612A
======================================================================
Trigger: 00031791 Segment: 037
BAT Trigger Time: 487455183.816
UTC: 2016-06-12T20:12:47.409 UTC [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst during slew is the T100 start time.
Analysis Position: [ source = GCN ]
RA: 348.36016588 Dec: -25.37509266 [deg; J2000]
Refined Position: [ source = BAT mosaic image ]
RA: 348.363855310457 Dec: -25.3744622153495 [deg; J2000]
{ 23h 13m 27.3s , -25d -22' -28.1" }
+/- 1.72755479244 [arcmin] (estimated 90% radius based on SNR)
SNR: 13.9311467835
Angular difference between the analysis and refined position is 0.203555 arcmin
Partial Coding Fraction: Unavailable because the burst occurred during slew.
Duration
T90: 0.247999966144562 +/- 0.0481663917788874
Measured from: 0.032
to: 0.28 [s; relative to TRIGTIME]
T50: 0.0919999480247498 +/- 0.0169705971403055
Measured from: 0.136
to: 0.228 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 0.308 0.000 0.308
T90 0.248 0.032 0.280
T50 0.092 0.136 0.228
Peak 1.000 -0.344 0.656
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -0.713 -0.175 0.183 - - - 4.30e-02 -4.13e-03 4.09e-03 67.280 57
CPL -0.706 -0.177 0.184 9999.320 -9999.320 -9999.320 4.31e-02 -3.89e-03 1.23e-02 67.370 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -0.713 -0.201 0.213 - - - 1.16e-02 -1.28e-03 1.26e-03 73.450 57
CPL -0.717 -0.191 0.227 9999.360 -9999.360 -9999.360 1.17e-02 -1.20e-03 3.97e-03 73.520 56
=== 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 PL 4.86e-09 1.45e-08 3.55e-08 2.41e-07 9.60e-08 2.96e-07 erg/cm2
90%_error_low -9.88e-10 -1.77e-09 -3.70e-09 -5.60e-08 -1.03e-08 -5.82e-08 erg/cm2
90%_error_hi 1.05e-09 1.72e-09 3.65e-09 6.89e-08 1.04e-08 7.01e-08 erg/cm2
Peak flux PL 2.25e-01 3.63e-01 4.43e-01 1.06e+00 1.33e+00 2.09e+00 ph/cm2/s
90%_error_low -5.50e-02 -5.54e-02 -4.70e-02 -2.48e-01 -1.39e-01 -2.60e-01 ph/cm2/s
90%_error_hi 6.04e-02 5.40e-02 4.66e-02 3.03e-01 1.40e-01 2.86e-01 ph/cm2/s
Fluence CPL 4.86e-09 1.44e-08 3.47e-08 2.44e-07 9.65e-08 2.64e-07 erg/cm2
90%_error_low -9.89e-10 -1.62e-09 -2.95e-09 -1.02e-07 -1.09e-08 -6.51e-08 erg/cm2
90%_error_hi 1.05e-09 1.88e-09 4.40e-09 2.17e-08 9.82e-09 2.64e-08 erg/cm2
Peak flux CPL 2.25e-01 3.63e-01 4.44e-01 1.05e+00 1.33e+00 2.18e+00 ph/cm2/s
90%_error_low N/A -5.55e-02 N/A N/A -1.40e-01 -6.72e-01 ph/cm2/s
90%_error_hi N/A 5.39e-02 N/A N/A 1.40e-01 3.64e-01 ph/cm2/s
======================================================================
Image
Note1: The mosaic image is made with timebin = 0.05 s; energybin = 15-350 keV
Note2: The mosaic image uses Galactic coordinate.
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 348.364 -25.374 0.005 20.892 -58.059 0.351 13.931 UNKNOWN Image time interval: 0.000 to 0.308 [sec]
Light Curves
Note: 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.
Best duration plot
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
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 0.116 sec. to 0.300 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.713411 ( -0.174889 0.183223 ) Norm@50keV : 4.30052E-02 ( -0.00412786 0.00409354 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.28 using 59 PHA bins. # Reduced chi-squared = 1.180 for 57 degrees of freedom # Null hypothesis probability = 1.654564e-01 Photon flux (15-150 keV) in 0.184 sec: 0.263736 ( 0.087171 0.371427 ) ph/cm2/s Energy fluence (15-150 keV) : 9.60169e-08 ( -1.02859e-08 1.03944e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.116 sec. to 0.300 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.705769 ( -0.177173 0.184449 ) Epeak [keV] : 9999.32 ( -9999.36 -9999.36 ) Norm@50keV : 4.31478E-02 ( -0.00407084 0.0121222 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.37 using 59 PHA bins. # Reduced chi-squared = 1.203 for 56 degrees of freedom # Null hypothesis probability = 1.420749e-01 Photon flux (15-150 keV) in 0.184 sec: 4.96430 ( -0.45959 0.46212 ) ph/cm2/s Energy fluence (15-150 keV) : 9.65089e-08 ( -1.08647e-08 9.82402e-09 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.344 sec. to 0.656 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.712569 ( -0.200663 0.212582 ) Norm@50keV : 1.15558E-02 ( -0.00128457 0.00125679 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 73.45 using 59 PHA bins. # Reduced chi-squared = 1.289 for 57 degrees of freedom # Null hypothesis probability = 7.017479e-02 Photon flux (15-150 keV) in 1 sec: 1.33446 ( -0.13949 0.13999 ) ph/cm2/s Energy fluence (15-150 keV) : 1.40275e-07 ( -1.56945e-08 1.57772e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.344 sec. to 0.656 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.717036 ( -0.191368 0.226408 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 1.16716E-02 ( -0.00119875 0.00397014 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 73.52 using 59 PHA bins. # Reduced chi-squared = 1.313 for 56 degrees of freedom # Null hypothesis probability = 5.815002e-02 Photon flux (15-150 keV) in 1 sec: 1.33405 ( -0.13971 0.13978 ) ph/cm2/s Energy fluence (15-150 keV) : 1.40653e-07 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
Mask shadow pattern unavailable because this burst occurs during telescope slews.Spacecraft aspect plot
