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 Jun 24 01:28:37 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger240766
======================================================================
Trigger: 00240766 Segment: 000
BAT Trigger Time: 186223678.016 [s; MET]
Trigger Stop: 186223679.04 [s; MET]
UTC: 2006-11-26T08:47:56.420860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 86.6247167166277 Dec: 64.1900414481625 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.76
Image Trigger?: NO
Rate S/N Ratio: 24.6170672501823 [ if not an image trigger ]
Image S/N Ratio: 8.76
Analysis Position: [ source = BAT ]
RA: 86.6247167166277 Dec: 64.1900414481625 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 86.6170343148871 Dec: 64.2052348257638 [deg; J2000]
{ 05h 46m 28.1s , +64d 12' 18.8" }
+/- 0.701287795139724 [arcmin] (estimated 90% radius based on SNR)
+/- 0.172785523399791 [arcmin] (formal 1-sigma fit error)
SNR: 50.4971130999758
Angular difference between the analysis and refined position is 0.933420 arcmin
Partial Coding Fraction: 0.4921875 [ including projection effects ]
Duration
T90: 52.6240000128746 +/- 10.7603732051911
Measured from: -0.967999994754791
to: 51.6560000181198 [s; relative to TRIGTIME]
T50: 14.8560000061989 +/- 0.451220573564801
Measured from: 6
to: 20.8560000061989 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.66400000452995
to: 7.66400000452995 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.20800000429153
to: 90.2159999907017 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.075817 3.142490 3.173302 1.054855
0.070256 0.074947 0.069718 0.059509 [error]
Peak 0.191699 0.388346 0.476143 0.200387
0.010648 0.013647 0.014977 0.013114 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 95.424 -5.208 90.216
T90 52.624 -0.968 51.656
T50 14.856 6.000 20.856
Peak 1.000 6.664 7.664
====== 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 -1.231 -0.050 0.050 - - - 6.93e-03 -1.84e-04 1.84e-04 49.900 57
CPL -1.167 -0.085 0.176 718.068 -718.068 -718.068 7.38e-03 -8.98e-04 1.28e-03 50.000 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 -0.885 -0.066 0.066 - - - 8.50e-02 -3.17e-03 3.16e-03 83.700 57
CPL -0.764 -0.148 0.260 609.595 -609.595 -609.595 9.59e-02 -7.38e-03 2.70e-02 83.010 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 6.57e-07 1.42e-06 2.43e-06 9.52e-06 6.65e-06 1.40e-05 erg/cm2
90%_error_low -3.75e-08 -4.76e-08 -7.12e-08 -6.52e-07 -1.81e-07 -6.80e-07 erg/cm2
90%_error_hi 3.84e-08 4.74e-08 7.10e-08 6.86e-07 1.81e-07 7.08e-07 erg/cm2
Peak flux PL 3.28e-04 9.20e-03 1.03e-01 9.92e+00 4.61e-01 9.92e+00 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 6.56e-07 1.43e-06 2.43e-06 9.59e-06 6.64e-06 1.34e-05 erg/cm2
90%_error_low -5.85e-08 -4.93e-08 -8.04e-08 -2.50e-06 -1.93e-07 -1.79e-06 erg/cm2
90%_error_hi 3.08e-08 4.93e-08 9.00e-08 3.08e-07 1.83e-07 6.38e-07 erg/cm2
Peak flux CPL N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 86.6170 64.2052 0.0038 36.1747 18.9473 10.0093052 50.497 TRIG_00240766 Foreground time interval of the image: -5.208 90.216 (delta_t = 95.424 [sec]) Background time interval of the image: -239.016 -5.208 (delta_t = 233.808 [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 -5.208 sec. to 90.216 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.23095 ( -0.0496593 0.0498784 ) Norm@50keV : 6.93195E-03 ( -0.000183921 0.000183594 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.90 using 59 PHA bins. # Reduced chi-squared = 0.8754 for 57 degrees of freedom # Null hypothesis probability = 7.362471e-01 Photon flux (15-150 keV) in 95.42 sec: 0.817397 ( -0.023678 0.023781 ) ph/cm2/s Energy fluence (15-150 keV) : 6.65426e-06 ( -1.812e-07 1.81387e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.208 sec. to 90.216 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.16658 ( -0.0734339 0.187444 ) Epeak [keV] : 718.068 ( -947.383 -947.383 ) Norm@50keV : 7.38302E-03 ( -0.000798077 0.00138264 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.00 using 59 PHA bins. # Reduced chi-squared = 0.8929 for 56 degrees of freedom # Null hypothesis probability = 7.000148e-01 Photon flux (15-150 keV) in 95.42 sec: 0.815460 ( -0.027767 0.026662 ) ph/cm2/s Energy fluence (15-150 keV) : 6.63788e-06 ( -1.92638e-07 1.82511e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.664 sec. to 7.664 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.885226 ( -0.065759 0.0663688 ) Norm@50keV : 8.50477E-02 ( -0.00316903 0.00315804 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 83.70 using 59 PHA bins. # Reduced chi-squared = 1.468 for 57 degrees of freedom # Null hypothesis probability = 1.216634e-02 Photon flux (15-150 keV) in 1 sec: 0.461441 ( ) ph/cm2/s Energy fluence (15-150 keV) : 9.60086e-07 ( -3.84063e-08 3.85104e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.664 sec. to 7.664 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.763882 ( -0.148371 0.259882 ) Epeak [keV] : 609.595 ( -609.595 -609.595 ) Norm@50keV : 9.58656E-02 ( -0.00737951 0.0270387 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 83.01 using 59 PHA bins. # Reduced chi-squared = 1.482 for 56 degrees of freedom # Null hypothesis probability = 1.102156e-02 Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 9.55586e-07 ( -3.98295e-08 3.96361e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 52.624 sec. Hardness ratio (energy fluence ratio) = 1.70415757506
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.0802532e-06 S(50-150 keV) = 4.573998e-06
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 = 6.915929901568856E-01, IMY = -2.374231425521771E-01
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: -239.016000 -5.208000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.0607 40.9364 2.8 39.4 -119.5 1.4454 4.1 2.4 Cyg X-3 326.1088 38.3519 7.6 32.4 -140.6 0.2871 1.5 3.5 Cyg X-2 16.1722 11.3184 2.4 48.7 137.7 3.2541 4.7 ------ UNKNOWN 52.3964 39.9324 2.4 35.1 74.2 1.6498 4.8 ------ UNKNOWN 19.1434 30.7440 2.6 30.1 127.7 1.0365 4.4 ------ UNKNOWN 12.2996 44.0947 3.1 15.8 133.0 0.5591 3.7 ------ UNKNOWN 330.1431 9.6867 2.8 56.2 -164.9 2.4222 4.1 ------ UNKNOWN 293.3266 48.8490 3.7 41.2 -99.5 2.5389 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.208000 90.216000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.0801 41.0504 7.1 39.3 -119.4 0.4535 1.6 6.0 Cyg X-3 326.1883 38.2450 13.2 32.4 -140.8 -0.1355 -0.9 4.7 Cyg X-2 86.6170 64.2052 0.2 36.2 18.9 10.0096 50.5 ------ UNKNOWN 244.0166 67.6188 2.3 46.0 -54.8 2.3551 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: