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: Sat Mar 28 17:53:05 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/GRB150101B
======================================================================
Trigger: 00091964 Segment: 035
BAT Trigger Time: 441818627.453
UTC: 2015-01-01T15:23:34.459 [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 = BAT ]
RA: 188.044 Dec: -10.956 [deg; J2000]
Refined Position: [ source = BAT non-slew period ]
RA: 188.043351498012 Dec: -10.9800097121477 [deg; J2000]
{ 12h 32m 10.4s , -10d 58' 48.0" }
+/- 2.43570546524558 [arcmin] (estimated 90% radius based on SNR)
+/- 1.37032457560375 [arcmin] (formal 1-sigma fit error)
SNR: 8.52701995124376
Angular difference between the analysis and refined position is 1.441089 arcmin
Partial Coding Fraction: Unavailable because the burst occurred during slew.
Duration
T90: 0.0119999647140503 +/- 0.00894423672410898
Measured from: 0
to: 0.012 [s; relative to TRIGTIME]
T50: 0.00399994850158691 +/- 0.00565686571343518
Measured from: 0.00400001
to: 0.00800002 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 0.016 0.000 0.016
T90 0.012 0.000 0.012
T50 0.004 0.004 0.008
Peak 1.000 -0.490 0.510
====== 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 -1.500 1.500 -3.852 - - - 0.00e+00 0.00e+00 1.43e-03 74.900 57
CPL -1.000 1.000 1.000 80.000 -80.000 -80.000 0.00e+00 N/A N/A 74.900 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
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 -1.392 -0.615 0.647 - - - 6.26e-03 -2.26e-03 2.26e-03 40.500 57
CPL -0.588 -6.032 3.362 96.554 -96.554 -96.554 1.48e-02 -1.48e-02 3.99e-01 40.060 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 1.28e-09 1.24e-10 4.85e-12 1.98e-13 1.41e-09 1.40e-09 erg/cm2
90%_error_low -9.35e-10 -1.17e-10 -4.81e-12 -1.98e-13 -1.06e-09 -1.05e-09 erg/cm2
90%_error_hi 9.12e-10 1.75e-10 1.84e-11 2.01e-12 1.07e-09 1.07e-09 erg/cm2
Peak flux PL 2.32e-01 2.49e-01 1.90e-01 2.36e-01 7.61e-01 9.08e-01 ph/cm2/s
90%_error_low -1.37e-01 -1.07e-01 -7.88e-02 -1.51e-01 -2.90e-01 -3.27e-01 ph/cm2/s
90%_error_hi 1.70e-01 1.03e-01 7.69e-02 2.59e-01 2.95e-01 3.29e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -9.35e-10 -1.17e-10 -4.81e-12 -1.98e-13 -1.06e-09 -1.05e-09 erg/cm2
90%_error_hi 9.12e-10 1.75e-10 1.84e-11 2.01e-12 1.07e-09 1.07e-09 erg/cm2
Peak flux CPL 1.92e-01 2.62e-01 2.08e-01 1.20e-01 7.34e-01 7.82e-01 ph/cm2/s
90%_error_low -1.92e-01 -1.24e-01 -8.98e-02 -1.20e-01 -2.99e-01 -3.34e-01 ph/cm2/s
90%_error_hi 1.95e-01 1.24e-01 9.66e-02 1.89e-01 3.03e-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 188.067 -10.967 0.011 33.320 154.659 0.915 6.093 UNKNOWN Image time interval: 0.000 to 0.050 [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 0.000 sec. to 0.016 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -6.7714 ( 6.73121 1.37875 ) Norm@50keV : 3.27111E-04 ( -0.000354862 0.00107017 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.36 using 59 PHA bins. # Reduced chi-squared = 1.217 for 57 degrees of freedom # Null hypothesis probability = 1.262406e-01 Photon flux (15-150 keV) in 0.016 sec: 3.01930 ( -2.20894 2.20708 ) ph/cm2/s Energy fluence (15-150 keV) : 1.40935e-09 ( -1.05665e-09 1.06584e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.016 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1 ( 1 1 ) Epeak [keV] : 80.0000 ( -80 -80 ) Norm@50keV : 0.0 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.90 using 59 PHA bins. # Reduced chi-squared = 1.337 for 56 degrees of freedom # Null hypothesis probability = 4.662137e-02 Photon flux (15-150 keV) in 0.016 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.490 sec. to 0.510 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.3919 ( -0.614947 0.647193 ) Norm@50keV : 6.26255E-03 ( -0.00225817 0.00225796 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.50 using 59 PHA bins. # Reduced chi-squared = 0.7104 for 57 degrees of freedom # Null hypothesis probability = 9.518064e-01 Photon flux (15-150 keV) in 1 sec: 0.761273 ( -0.289667 0.294997 ) ph/cm2/s Energy fluence (15-150 keV) : 6.0622e-08 ( -2.28343e-08 2.31676e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.490 sec. to 0.510 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.588143 ( -6.03431 3.35915 ) Epeak [keV] : 96.5538 ( -96.4568 -96.4568 ) Norm@50keV : 1.47844E-02 ( -0.0148191 0.399347 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.06 using 59 PHA bins. # Reduced chi-squared = 0.7154 for 56 degrees of freedom # Null hypothesis probability = 9.467490e-01 Photon flux (15-150 keV) in 1 sec: 0.733970 ( -0.298857 0.30347 ) ph/cm2/s Energy fluence (15-150 keV) : 5.85262e-08 ( -2.32729e-08 2.38288e-08 ) 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
