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: Mon Mar 23 21:48:16 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/GRB111126A
======================================================================
Trigger: 00048079 Segment: 001
BAT Trigger Time: 344026670.796
UTC: 2011-11-26T18:57:43.182 [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.
Refined Position: [ source = BAT mosaic image ]
RA: 276.029547698203 Dec: 51.4683728140965 [deg; J2000]
{ 18h 24m 07.1s , +51d 28' 06.1" }
+/- 2.47271567058 [arcmin] (estimated 90% radius based on SNR)
SNR: 8.34637312641
Angular difference between the analysis and refined position is Usage: arcmin
Partial Coding Fraction: Unavailable because the burst occurred during slew.
Duration
T90: 0.671999931335449 +/- 0.0393954323691675
Measured from: 0.00800002
to: 0.68 [s; relative to TRIGTIME]
T50: 0.551999926567078 +/- 0.33604763049332
Measured from: 0.056
to: 0.608 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 0.712 0.000 0.712
T90 0.672 0.008 0.680
T50 0.552 0.056 0.608
Peak 1.000 -0.144 0.856
====== 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: 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 -1.040 -0.299 0.312 - - - 8.81e-03 -1.40e-03 1.40e-03 62.570 57
CPL -1.039 -0.297 0.319 9999.360 -9999.360 -9999.360 8.86e-03 -1.41e-03 1.41e-03 62.590 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 -1.188 -0.334 0.344 - - - 6.27e-03 -1.14e-03 1.14e-03 71.290 57
CPL -1.193 -0.327 0.355 9999.350 -9999.350 -9999.350 6.29e-03 -1.15e-03 1.01e-02 71.300 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 5.21e-09 1.27e-08 2.47e-08 1.19e-07 6.69e-08 1.61e-07 erg/cm2
90%_error_low -1.63e-09 -2.46e-09 -4.79e-09 -4.56e-08 -1.22e-08 -4.92e-08 erg/cm2
90%_error_hi 1.79e-09 2.36e-09 4.67e-09 6.42e-08 1.24e-08 6.57e-08 erg/cm2
Peak flux PL 1.91e-01 2.32e-01 2.04e-01 3.07e-01 7.34e-01 9.34e-01 ph/cm2/s
90%_error_low -6.40e-02 -4.93e-02 -4.58e-02 -1.26e-01 -1.35e-01 -1.83e-01 ph/cm2/s
90%_error_hi 6.99e-02 4.76e-02 4.47e-02 1.76e-01 1.35e-01 1.94e-01 ph/cm2/s
Fluence CPL 5.21e-09 1.25e-08 2.42e-08 1.20e-07 6.73e-08 1.50e-07 erg/cm2
90%_error_low -1.64e-09 -3.36e-09 -6.23e-09 -7.79e-08 N/A -6.43e-08 erg/cm2
90%_error_hi 1.78e-09 3.57e-09 7.10e-09 6.46e-08 N/A 7.47e-08 erg/cm2
Peak flux CPL 1.95e-01 2.32e-01 2.02e-01 3.05e-01 7.39e-01 9.37e-01 ph/cm2/s
90%_error_low N/A -4.95e-02 -4.49e-02 N/A N/A -2.47e-01 ph/cm2/s
90%_error_hi N/A 4.89e-02 4.65e-02 N/A N/A 1.71e-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 276.030 51.468 0.008 24.902 -110.619 0.122 8.346 UNKNOWN Image time interval: 0.000 to 0.712 [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 0.712 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.03954 ( -0.299295 0.312496 ) Norm@50keV : 8.80822E-03 ( -0.00140328 0.00140203 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.57 using 59 PHA bins. # Reduced chi-squared = 1.098 for 57 degrees of freedom # Null hypothesis probability = 2.850734e-01 Photon flux (15-150 keV) in 0.712 sec: 1.01655 ( -0.164297 0.16468 ) ph/cm2/s Energy fluence (15-150 keV) : 6.68975e-08 ( -1.22236e-08 1.23891e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.712 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.03862 ( -0.297256 0.318641 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 8.85839E-03 ( -0.00140731 0.00140831 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.59 using 59 PHA bins. # Reduced chi-squared = 1.118 for 56 degrees of freedom # Null hypothesis probability = 2.538394e-01 Photon flux (15-150 keV) in 0.712 sec: 1.01632 ( -0.164441 0.16458 ) ph/cm2/s Energy fluence (15-150 keV) : 6.72713e-08 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.144 sec. to 0.856 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.18795 ( -0.334123 0.344485 ) Norm@50keV : 6.26712E-03 ( -0.00114236 0.00114017 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 71.29 using 59 PHA bins. # Reduced chi-squared = 1.251 for 57 degrees of freedom # Null hypothesis probability = 9.648203e-02 Photon flux (15-150 keV) in 1 sec: 0.734412 ( -0.134748 0.135016 ) ph/cm2/s Energy fluence (15-150 keV) : 6.38087e-08 ( -1.34215e-08 1.36785e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.144 sec. to 0.856 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.19251 ( -0.32805 0.35468 ) Epeak [keV] : 9999.35 ( -9999.36 -9999.36 ) Norm@50keV : 6.29336E-03 ( -0.0011467 0.0100751 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 71.30 using 59 PHA bins. # Reduced chi-squared = 1.273 for 56 degrees of freedom # Null hypothesis probability = 8.170985e-02 Photon flux (15-150 keV) in 1 sec: 0.739362 ( ) ph/cm2/s Energy fluence (15-150 keV) : 6.48724e-08 ( -1.46104e-08 1.23459e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.6719999 sec. Hardness ratio (energy fluence ratio) = 1.94594231078
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.7925467e-08 S(50-150 keV) = 4.897205e-08
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
