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 GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Wed May 6 16:52:15 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger441015
======================================================================
Trigger: 00441015 Segment: 000
BAT Trigger Time: 314995072 [s; MET]
Trigger Stop: 314996160 [s; MET]
UTC: 2010-12-25T18:37:45.500280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 0.234180491347238 Dec: 44.6016240751001 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.06
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.06
Analysis Position: [ source = BAT ]
RA: 0.234180491347238 Dec: 44.6016240751001 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 0.234179 Dec: 44.6016 [deg; J2000]
{ 00h 00m 56.2s , +44d 36' 05.8" }
+/- 3.28171838899 [arcmin] (estimated 90% radius based on SNR)
SNR: 5.57041576246
Angular difference between the analysis and refined position is 0.001446 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: N/A +/- N/A
Measured from: N/A
to: N/A [s; relative to TRIGTIME]
T50: N/A +/- N/A
Measured from: N/A
to: N/A [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
====== Table of the duration information =============================
Value tstart tstop
T100 N/A N/A N/A
T90 N/A N/A N/A
T50 N/A N/A N/A
Peak N/A N/A N/A
====== 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 -1.831 -0.319 0.298 - - - 2.00e-04 -4.27e-05 4.15e-05 63.180 57
CPL -1.449 -0.756 1.350 57.001 -49.819 -57.001 3.40e-04 -3.40e-04 2.13e-03 62.760 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 N/A N/A N/A - - - N/A N/A N/A N/A N/A
CPL N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
=== 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 3.98e-07 5.98e-07 6.72e-07 1.43e-06 2.10e-06 3.10e-06 erg/cm2
90%_error_low -8.97e-08 -1.01e-07 -1.89e-07 -6.63e-07 -4.39e-07 -9.03e-07 erg/cm2
90%_error_hi 9.18e-08 1.00e-07 1.98e-07 9.81e-07 4.60e-07 1.17e-06 erg/cm2
Peak flux PL N/A N/A N/A N/A N/A N/A ph/cm2/s
Image
Pre-slew 15.0-50.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 0.234 44.602 0.000 22.856 -40.158 2.335 5.570 TRIG_00441015 Image time interval: 0.000 to 963.064 [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.
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 -179.000 sec. to 963.064 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.83102 ( -0.318958 0.298458 ) Norm@50keV : 1.99768E-04 ( -4.27465e-05 4.14519e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.18 using 59 PHA bins. # Reduced chi-squared = 1.108 for 57 degrees of freedom # Null hypothesis probability = 2.672909e-01 Photon flux (15-150 keV) in 1142 sec: 2.78672E-02 ( -0.0046232 0.0046239 ) ph/cm2/s Energy fluence (15-150 keV) : 2.09868e-06 ( -4.39219e-07 4.60122e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -179.000 sec. to 963.064 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.44935 ( -0.755796 1.35019 ) Epeak [keV] : 57.0008 ( -49.8236 -57.0052 ) Norm@50keV : 3.39882E-04 ( -0.000339803 0.00212706 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.76 using 59 PHA bins. # Reduced chi-squared = 1.121 for 56 degrees of freedom # Null hypothesis probability = 2.492574e-01 Photon flux (15-150 keV) in 1142 sec: 2.74676E-02 ( -0.0047115 0.004729 ) ph/cm2/s Energy fluence (15-150 keV) : 1.98393e-06 ( -5.14711e-07 4.98782e-07 ) ergs/cm2
1-s peak spectrum fit
1-s peak spectrum unavailable, likely because there are no event data in the 1-s peak range.
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
IMX = 0.322152438849, IMY = 0.271833595844
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.000000 963.063800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 54.9543 -7.2856 3.0 48.6 142.4 11.2160 3.8 ------ UNKNOWN 52.7551 25.7496 2.8 26.2 99.8 3.5990 4.1 ------ UNKNOWN 26.5456 53.1976 2.6 22.5 10.9 2.4137 4.4 ------ UNKNOWN 0.2580 44.6124 2.4 22.8 -40.1 3.0309 4.8 ------ UNKNOWN 346.6273 46.8687 2.7 32.5 -43.6 3.2000 4.4 ------ UNKNOWN 298.4431 70.1671 2.5 59.6 -17.0 17.8011 4.5 ------ UNKNOWN 317.1990 49.9788 4.0 52.1 -42.1 10.0765 2.9 ------ UNKNOWN 352.0292 -7.0557 3.2 48.3 -130.1 10.0968 3.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: