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: Tue Sep 29 19:43:28 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger654042
======================================================================
Trigger: 00654042 Segment: 000
BAT Trigger Time: 462814010.752 [s; MET]
Trigger Stop: 462814018.944 [s; MET]
UTC: 2015-09-01T15:26:35.677500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 183.585766451719 Dec: 25.0385495735529 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.11
Image Trigger?: NO
Rate S/N Ratio: 10.3440804327886 [ if not an image trigger ]
Image S/N Ratio: 7.11
Analysis Position: [ source = BAT ]
RA: 183.585766451719 Dec: 25.0385495735529 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 183.588313357 Dec: 25.0764327696 [deg; J2000]
{ 12h 14m 21.2s , +25d 04' 35.2" }
+/- 2.55490413801 [arcmin] (estimated 90% radius based on SNR)
SNR: 7.96547115941
Angular difference between the analysis and refined position is 2.277203 arcmin
Partial Coding Fraction: 0.4140625 [ including projection effects ]
Duration
T90: 64 +/- 35.7770876399966
Measured from: -61.7519999742508
to: 2.24800002574921 [s; relative to TRIGTIME]
T50: 64 +/- 16
Measured from: -61.7519999742508
to: 2.24800002574921 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.74800002574921
to: 10.7480000257492 [s; relative to TRIGTIME]
Total Fluence
Measured from: -61.7519999742508
to: 18.2480000257492 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.482450 0.330587 0.144066 0.009591
0.075532 0.078198 0.067571 0.059069 [error]
Peak 0.006878 0.004324 0.001329 0.006645
0.008999 0.008773 0.007576 0.006798 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 80.000 -61.752 18.248
T90 64.000 -61.752 2.248
T50 64.000 -61.752 2.248
Peak 1.000 9.748 10.748
====== 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 -2.592 -0.552 0.449 - - - 5.53e-04 -2.19e-04 2.24e-04 48.640 57
CPL -1.867 N/A N/A 5.760 N/A N/A 1.73e-03 N/A N/A 48.310 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 -0.829 0.829 0.829 - - - 4.37e-04 -4.37e-04 -4.34e-04 62.930 57
CPL -0.435 0.435 0.435 221.975 N/A N/A 6.61e-04 N/A N/A 62.930 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 1.59e-07 1.52e-07 1.01e-07 1.04e-07 4.55e-07 5.16e-07 erg/cm2
90%_error_low -3.84e-08 -4.20e-08 -4.90e-08 -7.10e-08 -1.25e-07 -1.66e-07 erg/cm2
90%_error_hi 3.85e-08 3.98e-08 5.94e-08 1.41e-07 1.36e-07 2.20e-07 erg/cm2
Peak flux PL 9.50e-03 1.43e-02 1.61e-02 3.44e-02 5.02e-02 7.42e-02 ph/cm2/s
90%_error_low -9.50e-03 -1.43e-02 -1.61e-02 -3.44e-02 -5.02e-02 -7.42e-02 ph/cm2/s
90%_error_hi 1.30e-01 7.30e-02 5.41e-02 7.23e-01 2.10e-01 7.10e-01 ph/cm2/s
Fluence CPL 1.60e-07 1.56e-07 9.92e-08 9.96e-08 4.56e-07 5.20e-07 erg/cm2
90%_error_low -4.20e-08 N/A -4.93e-08 N/A -1.26e-07 -1.65e-07 erg/cm2
90%_error_hi 3.86e-08 N/A 6.42e-08 N/A 1.38e-07 5.09e-07 erg/cm2
Peak flux CPL 8.98e-03 1.43e-02 1.65e-02 2.90e-02 4.98e-02 6.68e-02 ph/cm2/s
90%_error_low -8.98e-03 -1.43e-02 -1.65e-02 -2.90e-02 -4.98e-02 N/A ph/cm2/s
90%_error_hi 1.27e-01 1.43e-01 6.94e-02 1.11e+00 2.08e-01 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 183.588 25.076 0.024 33.739 -62.924 0.309 7.965 TRIG_00654042 Image time interval: 0.000 to 8.192 [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 -61.752 sec. to 18.248 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.59219 ( -0.552111 0.448721 ) Norm@50keV : 5.53393E-04 ( -0.000218747 0.000224018 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.64 using 59 PHA bins. # Reduced chi-squared = 0.8533 for 57 degrees of freedom # Null hypothesis probability = 7.769335e-01 Photon flux (15-150 keV) in 80 sec: 0.115172 ( -0.0244711 0.02452 ) ph/cm2/s Energy fluence (15-150 keV) : 4.54716e-07 ( -1.2478e-07 1.36219e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -61.752 sec. to 18.248 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.8673 ( ) Epeak [keV] : 5.76002 ( ) Norm@50keV : 1.73438E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.31 using 59 PHA bins. # Reduced chi-squared = 0.8627 for 56 degrees of freedom # Null hypothesis probability = 7.576160e-01 Photon flux (15-150 keV) in 80 sec: 0.113539 ( -0.0251476 0.024333 ) ph/cm2/s Energy fluence (15-150 keV) : 4.55512e-07 ( -1.25553e-07 1.38315e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 9.748 sec. to 10.748 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 2.84344 ( -2.84344 -2.84344 ) Norm@50keV : 8.78601E-07 ( -8.78601e-07 2.72051e-06 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.89 using 59 PHA bins. # Reduced chi-squared = 1.103 for 57 degrees of freedom # Null hypothesis probability = 2.757389e-01 Photon flux (15-150 keV) in 1 sec: 5.02115E-02 7.79881E-04 ( ) ph/cm2/s Energy fluence (15-150 keV) : 5.04847e-09 ( 1 1.71846e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.748 sec. to 10.748 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.92231 ( 2.92278 2.92278 ) Epeak [keV] : 221.673 ( ) Norm@50keV : 5.16854E-07 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.88 using 59 PHA bins. # Reduced chi-squared = 1.123 for 56 degrees of freedom # Null hypothesis probability = 2.457246e-01 Photon flux (15-150 keV) in 1 sec: 4.98306E-02 ( -0.0498306 0.207888 ) ph/cm2/s Energy fluence (15-150 keV) : 5.02701e-09 ( 1 1.71504e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 64.0 sec. Hardness ratio (energy fluence ratio) = 0.663376576894
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.114879e-07 S(50-150 keV) = 1.4323504e-07
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 = 0.304010893548, IMY = 0.594697570766
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: -132.651410 -61.752000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9860 -15.6187 1.2 38.6 115.4 2.7095 9.2 1.3 Sco X-1 254.4143 35.5334 15.2 47.8 36.9 -0.2992 -0.8 11.7 Her X-1 230.7262 43.1338 2.3 39.9 10.5 0.7713 5.0 ------ UNKNOWN 216.1457 8.3569 2.8 3.7 48.4 0.3622 4.2 ------ UNKNOWN 224.9323 64.0246 2.8 58.2 -3.6 2.3267 4.2 ------ UNKNOWN 193.7734 -29.3017 2.6 40.2 -163.3 0.6036 4.4 ------ UNKNOWN 185.7293 18.3332 2.0 29.1 -73.1 0.7604 5.8 ------ UNKNOWN 181.6786 -3.2149 2.2 32.7 -116.0 0.7509 5.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -61.752000 18.248000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0012 -15.5173 3.8 38.6 115.2 -1.2221 -3.0 7.5 Sco X-1 254.6307 35.4060 0.0 47.9 37.1 -0.5140 -0.9 9.3 Her X-1 254.0039 21.3451 2.5 42.3 55.4 2.4860 4.6 ------ UNKNOWN 245.2824 -2.3248 2.2 33.4 94.5 1.5045 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 341.948610 662.339700 840.248000 902.308000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4619 35.3465 9.4 57.8 -155.1 2.6402 1.2 0.3 Her X-1 288.7944 10.8891 2.4 48.1 156.0 6.2989 4.7 3.4 GRS 1915+105 299.5938 35.1792 0.6 25.1 178.2 6.6517 19.8 1.4 Cyg X-1 308.0904 40.9057 1.0 16.9 -172.8 3.9459 11.1 3.0 Cyg X-3 326.0625 38.2737 7.0 5.3 136.9 0.5814 1.6 5.9 Cyg X-2 277.5049 12.1869 2.1 54.8 167.4 11.6372 5.6 ------ UNKNOWN 37.1685 51.1321 3.2 44.9 -31.0 2.2579 3.7 ------ UNKNOWN 274.1049 72.2225 2.9 40.1 -109.0 4.0269 4.0 ------ UNKNOWN 251.8724 43.7816 6.2 55.3 -145.2 3.6466 1.9 ------ UNKNOWN 52.0530 59.0833 3.3 50.7 -44.6 6.1630 3.5 ------ UNKNOWN 282.4152 79.0047 5.4 41.0 -98.2 3.9022 2.2 ------ UNKNOWN 47.7123 66.8778 3.3 46.9 -54.1 5.0275 3.5 ------ UNKNOWN 258.2252 64.2710 3.0 45.3 -121.3 5.8157 3.9 ------ UNKNOWN