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: Thu Sep 28 17:56:00 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger770528
======================================================================
Trigger: 00770528 Segment: 000
BAT Trigger Time: 526135766.848 [s; MET]
Trigger Stop: 526135767.872 [s; MET]
UTC: 2017-09-03T12:49:07.219440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 254.511712851535 Dec: 34.9835881466908 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.84
Image Trigger?: NO
Rate S/N Ratio: 17.7763888346312 [ if not an image trigger ]
Image S/N Ratio: 9.84
Analysis Position: [ source = BAT ]
RA: 254.511712851535 Dec: 34.9835881466908 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 254.523170046904 Dec: 34.9822900582206 [deg; J2000]
{ 16h 58m 05.6s , +34d 58' 56.2" }
+/- 1.22057722602866 [arcmin] (estimated 90% radius based on SNR)
+/- 0.444986574520974 [arcmin] (formal 1-sigma fit error)
SNR: 22.8798787864337
Angular difference between the analysis and refined position is 0.568588 arcmin
Partial Coding Fraction: 0.3007812 [ including projection effects ]
Duration
T90: 27.7239999771118 +/- 4.50650779531548
Measured from: -5.26800000667572
to: 22.4559999704361 [s; relative to TRIGTIME]
T50: 10.3559999465942 +/- 1.76041018375818
Measured from: 1.00400000810623
to: 11.3599999547005 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.579999983310699
to: 1.5799999833107 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.99599999189377
to: 25.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.230462 1.452451 0.838055 0.305940
0.083683 0.081894 0.068563 0.055324 [error]
Peak 0.126376 0.164330 0.102325 0.036224
0.016225 0.017028 0.013970 0.010457 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 35.700 -9.996 25.704
T90 27.724 -5.268 22.456
T50 10.356 1.004 11.360
Peak 1.000 0.580 1.580
====== 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 -1.951 -0.122 0.120 - - - 7.17e-03 -5.15e-04 5.09e-04 72.710 57
CPL -2.011 -0.014 0.446 8.126 N/A N/A 6.65e-03 N/A N/A 72.640 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 -1.850 -0.207 0.202 - - - 2.78e-02 -3.56e-03 3.50e-03 67.430 57
CPL -1.855 -0.704 0.715 9999.360 N/A N/A 2.78e-02 N/A N/A 67.430 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 5.00e-07 6.99e-07 7.23e-07 1.37e-06 2.36e-06 3.29e-06 erg/cm2
90%_error_low -5.18e-08 -4.54e-08 -7.03e-08 -2.59e-07 -1.64e-07 -3.28e-07 erg/cm2
90%_error_hi 5.33e-08 4.54e-08 7.03e-08 2.96e-07 1.65e-07 3.53e-07 erg/cm2
Peak flux PL 1.60e+00 1.31e+00 7.29e-01 5.95e-01 3.91e+00 4.24e+00 ph/cm2/s
90%_error_low -2.93e-01 -1.57e-01 -1.19e-01 -1.72e-01 -4.71e-01 -4.93e-01 ph/cm2/s
90%_error_hi 3.05e-01 1.56e-01 1.18e-01 2.08e-01 4.72e-01 4.93e-01 ph/cm2/s
Fluence CPL 5.03e-07 6.97e-07 7.29e-07 1.35e-06 2.37e-06 3.29e-06 erg/cm2
90%_error_low N/A -4.36e-08 -1.38e-07 -6.24e-07 -1.84e-07 -3.52e-07 erg/cm2
90%_error_hi N/A 4.83e-08 4.34e-08 1.90e-07 1.57e-07 3.37e-07 erg/cm2
Peak flux CPL 1.60e+00 1.18e+00 5.99e-01 5.09e-01 3.58e+00 3.88e+00 ph/cm2/s
90%_error_low -3.77e-01 -2.57e-01 -1.37e-01 -1.10e-01 -7.71e-01 -1.02e+00 ph/cm2/s
90%_error_hi 3.48e-01 2.83e-01 1.27e-01 1.01e-01 7.97e-01 4.31e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 254.5232 34.9823 0.0084 46.7038 -29.2684 3.8462961 22.880 TRIG_00770528 Foreground time interval of the image: -9.996 25.704 (delta_t = 35.700 [sec]) Background time interval of the image: -239.848 -9.996 (delta_t = 229.852 [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 -9.996 sec. to 25.704 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.95058 ( -0.122369 0.119787 ) Norm@50keV : 7.16879E-03 ( -0.000514595 0.000508838 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.71 using 59 PHA bins. # Reduced chi-squared = 1.276 for 57 degrees of freedom # Null hypothesis probability = 7.843826e-02 Photon flux (15-150 keV) in 35.7 sec: 1.05168 ( -0.071412 0.07168 ) ph/cm2/s Energy fluence (15-150 keV) : 2.35564e-06 ( -1.63849e-07 1.64757e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.996 sec. to 25.704 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.01065 ( -0.013823 0.446129 ) Epeak [keV] : 8.12603 ( ) Norm@50keV : 6.65484E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.64 using 59 PHA bins. # Reduced chi-squared = 1.297 for 56 degrees of freedom # Null hypothesis probability = 6.676483e-02 Photon flux (15-150 keV) in 35.7 sec: 1.03062 ( -0.133493 0.10102 ) ph/cm2/s Energy fluence (15-150 keV) : 2.36946e-06 ( -1.83818e-07 1.57155e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.580 sec. to 1.580 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.84979 ( -0.207154 0.201656 ) Norm@50keV : 2.78208E-02 ( -0.00355849 0.00349897 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.43 using 59 PHA bins. # Reduced chi-squared = 1.183 for 57 degrees of freedom # Null hypothesis probability = 1.625325e-01 Photon flux (15-150 keV) in 1 sec: 3.91038 ( -0.47119 0.47223 ) ph/cm2/s Energy fluence (15-150 keV) : 2.55847e-07 ( -3.25669e-08 3.2782e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.580 sec. to 1.580 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.85523 ( -0.705641 0.712774 ) Epeak [keV] : 9999.36 ( ) Norm@50keV : 2.77527E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.43 using 59 PHA bins. # Reduced chi-squared = 1.204 for 56 degrees of freedom # Null hypothesis probability = 1.409466e-01 Photon flux (15-150 keV) in 1 sec: 3.58162 ( -0.77133 0.79692 ) ph/cm2/s Energy fluence (15-150 keV) : 2.56478e-07 ( -3.32853e-08 2.65699e-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
IMX = 9.258263296751151E-01, IMY = 5.188779791649856E-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: -239.848000 -9.996000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9889 -15.6555 1.4 36.3 -109.8 4.2700 8.2 1.1 Sco X-1 254.3920 35.3379 5.4 47.1 -29.1 -0.9778 -2.1 3.2 Her X-1 255.9831 -37.8427 21.0 39.7 -149.3 0.2048 0.5 0.2 4U 1700-377 256.4417 -36.4386 16.2 38.4 -148.3 0.2383 0.7 1.0 GX 349+2 262.8540 -24.7629 17.4 26.0 -141.5 0.1613 0.7 8.5 GX 1+4 264.8394 -44.4167 4.7 41.7 -163.3 0.8184 2.4 4.6 4U 1735-44 268.3844 -1.4431 235.3 12.4 -74.0 0.0114 0.0 1.1 SW J1753.5-0127 270.2696 -25.0106 2.3 22.3 -155.4 1.0705 4.9 4.2 GX 5-1 270.3234 -25.8476 6.0 23.0 -156.4 0.4159 1.9 6.4 GRS 1758-258 273.9570 -14.0578 3.2 11.1 -146.0 0.7713 3.6 3.1 GX 17+2 276.0808 -30.5219 0.0 25.9 -171.6 0.2890 1.2 12.3 H1820-303 285.1514 -24.7776 7.9 20.4 167.3 0.3149 1.5 10.6 HT1900.1-2455 288.8015 10.9563 1.1 18.0 28.1 2.2169 10.5 0.7 GRS 1915+105 299.6069 35.1925 1.2 44.0 22.9 4.1142 9.4 1.0 Cyg X-1 308.1104 40.9533 14.1 52.5 26.4 0.8617 0.8 0.0 Cyg X-3 263.0175 -33.8873 3.3 33.1 -153.1 0.9361 3.5 3.5 GX 354-0 266.5899 7.8399 3.5 18.7 -47.0 0.7433 3.3 ------ UNKNOWN 237.6865 -31.7089 2.8 48.0 -129.2 3.9312 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -9.996000 25.704000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9678 -15.5669 3.0 36.3 -109.7 -0.6805 -3.8 4.5 Sco X-1 254.3053 35.1620 0.0 47.0 -29.3 0.0318 0.2 13.2 Her X-1 255.8217 -37.9552 0.0 39.8 -149.3 -0.2107 -1.7 10.3 4U 1700-377 256.5858 -36.5843 21.6 38.4 -148.6 -0.0673 -0.5 12.1 GX 349+2 263.0439 -24.6040 11.3 25.7 -141.6 0.0941 1.0 8.7 GX 1+4 264.6198 -44.3606 5.0 41.8 -163.1 0.2776 2.3 7.5 4U 1735-44 268.3372 -1.5992 6.0 12.4 -74.8 -0.1505 -1.9 9.0 SW J1753.5-0127 270.1495 -25.1018 32.2 22.4 -155.2 0.0292 0.4 7.4 GX 5-1 270.1608 -25.7830 6.3 23.0 -156.0 0.1491 1.8 8.0 GRS 1758-258 274.1598 -13.8910 0.0 10.8 -146.4 0.1760 2.3 12.5 GX 17+2 276.0728 -30.4174 8.8 25.8 -171.6 0.1029 1.3 8.2 H1820-303 285.1928 -25.0651 0.0 20.7 167.4 0.0981 1.3 12.2 HT1900.1-2455 288.7193 11.0329 5.8 18.0 27.7 -0.1558 -2.0 7.0 GRS 1915+105 299.5720 35.2253 9.2 44.1 22.9 -0.1993 -1.3 1.7 Cyg X-1 308.0006 40.9514 5.3 52.4 26.3 -0.8067 -2.2 5.0 Cyg X-3 262.9515 -33.7456 5.3 33.0 -152.9 -0.2109 -2.2 5.7 GX 354-0 320.1092 -36.6359 2.8 48.3 136.5 1.4129 4.2 ------ UNKNOWN 254.5305 34.9781 0.6 46.7 -29.3 3.8879 23.1 ------ UNKNOWN 241.4875 27.5046 2.1 49.5 -46.9 1.8738 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 171.852610 962.248700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.6166 35.2076 2.1 48.7 154.1 11.4289 5.5 1.3 Cyg X-1 308.0681 40.9823 2.5 40.2 150.7 6.3439 4.7 2.6 Cyg X-3 326.1872 38.3316 38.2 34.9 129.0 0.3495 0.3 0.9 Cyg X-2 60.5139 21.6167 3.3 55.4 0.6 7.1431 3.5 ------ UNKNOWN 268.6834 45.4097 3.4 53.1 -173.4 6.0110 3.3 ------ UNKNOWN 98.3637 56.5070 2.9 42.1 -57.6 8.6661 3.9 ------ UNKNOWN 106.4099 58.1563 3.3 43.6 -64.0 11.0438 3.5 ------ UNKNOWN