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 24 15:43:20 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger750298
======================================================================
Trigger: 00750298 Segment: 000
BAT Trigger Time: 515063641.216 [s; MET]
Trigger Stop: 515063641.664 [s; MET]
UTC: 2017-04-28T09:13:42.238600 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 64 ms to TRIGTIME + 320 ms
BAT
RA: 330.062855519899 Dec: 26.9175780247122 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.87
Image Trigger?: NO
Rate S/N Ratio: 96.3587048480831 [ if not an image trigger ]
Image S/N Ratio: 12.87
Analysis Position: [ source = BAT ]
RA: 330.062855519899 Dec: 26.9175780247122 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 330.051862971472 Dec: 26.9135089948278 [deg; J2000]
{ 22h 00m 12.4s , +26d 54' 48.6" }
+/- 1.22146912638955 [arcmin] (estimated 90% radius based on SNR)
+/- 0.463192274735448 [arcmin] (formal 1-sigma fit error)
SNR: 22.8560159779109
Angular difference between the analysis and refined position is 0.636769 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 0.199999928474426 +/- 0.0737563758292483
Measured from: 0.164000034332275
to: 0.363999962806702 [s; relative to TRIGTIME]
T50: 0.0999999642372131 +/- 0.0226274207069314
Measured from: 0.200000047683716
to: 0.300000011920929 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.199999988079071
to: 0.800000011920929 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.148000061511993
to: 0.448000013828278 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.040429 0.116143 0.133712 0.074641
0.006092 0.007808 0.008790 0.007758 [error]
Peak 0.044862 0.123833 0.134522 0.081290
0.009109 0.010458 0.010608 0.009487 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.300 0.148 0.448
T90 0.200 0.164 0.364
T50 0.100 0.200 0.300
Peak 1.000 -0.200 0.800
====== 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 -0.759 -0.122 0.125 - - - 7.85e-02 -5.67e-03 5.65e-03 58.410 57
CPL -0.415 -0.441 0.548 266.609 -266.609 -266.609 1.12e-01 -3.82e-02 8.09e-02 56.980 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 -0.812 -0.154 0.159 - - - 2.46e-02 -2.22e-03 2.20e-03 51.690 57
CPL -0.589 -0.295 0.652 371.959 -371.959 -371.959 3.08e-02 -7.97e-03 2.69e-02 51.260 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 1.51e-08 4.38e-08 1.04e-07 6.71e-07 2.80e-07 8.34e-07 erg/cm2
90%_error_low -2.18e-09 -3.90e-09 -7.96e-09 -1.12e-07 -2.19e-08 -1.17e-07 erg/cm2
90%_error_hi 2.29e-09 3.85e-09 7.92e-09 1.28e-07 2.21e-08 1.31e-07 erg/cm2
Peak flux PL 5.25e-01 7.99e-01 9.10e-01 1.98e+00 2.82e+00 4.21e+00 ph/cm2/s
90%_error_low -9.88e-02 -9.47e-02 -8.18e-02 -3.70e-01 -2.50e-01 -4.16e-01 ph/cm2/s
90%_error_hi 1.06e-01 9.35e-02 8.14e-02 4.27e-01 2.51e-01 4.36e-01 ph/cm2/s
Fluence CPL 1.39e-08 4.50e-08 1.08e-07 4.21e-07 2.75e-07 5.88e-07 erg/cm2
90%_error_low -2.70e-09 -4.28e-09 -9.79e-09 -1.96e-07 -2.43e-08 -1.94e-07 erg/cm2
90%_error_hi 2.81e-09 4.39e-09 9.94e-09 2.86e-07 2.34e-08 2.87e-07 erg/cm2
Peak flux CPL 4.94e-01 8.07e-01 9.35e-01 1.57e+00 2.80e+00 3.80e+00 ph/cm2/s
90%_error_low -1.23e-01 -9.84e-02 -1.00e-01 -6.88e-01 -2.57e-01 -7.35e-01 ph/cm2/s
90%_error_hi 6.75e-02 9.98e-02 1.05e-01 5.27e-01 2.56e-01 4.82e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 330.0519 26.9135 0.0084 33.0199 165.7439 0.3698468 22.856 TRIG_00750298 Foreground time interval of the image: 0.148 0.448 (delta_t = 0.300 [sec]) Background time interval of the image: -622.015 -607.936 (delta_t = 14.080 [sec]) -179.216 0.148 (delta_t = 179.364 [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 0.148 sec. to 0.448 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.758586 ( -0.121921 0.124939 ) Norm@50keV : 7.84841E-02 ( -0.00567241 0.00564841 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.41 using 59 PHA bins. # Reduced chi-squared = 1.025 for 57 degrees of freedom # Null hypothesis probability = 4.232770e-01 Photon flux (15-150 keV) in 0.3 sec: 0.525477 ( -0.032798 0.146213 ) ph/cm2/s Energy fluence (15-150 keV) : 2.80079e-07 ( -2.19478e-08 2.20766e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.148 sec. to 0.448 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.415329 ( -0.440599 0.547899 ) Epeak [keV] : 266.609 ( -266.609 -266.609 ) Norm@50keV : 0.111675 ( -0.0382381 0.0808612 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.98 using 59 PHA bins. # Reduced chi-squared = 1.018 for 56 degrees of freedom # Null hypothesis probability = 4.382536e-01 Photon flux (15-150 keV) in 0.3 sec: 8.94465 ( -0.65503 0.6538 ) ph/cm2/s Energy fluence (15-150 keV) : 2.75284e-07 ( -2.42914e-08 2.33649e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.200 sec. to 0.800 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.811916 ( -0.153553 0.159445 ) Norm@50keV : 2.45799E-02 ( -0.00222394 0.00220428 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.69 using 59 PHA bins. # Reduced chi-squared = 0.9068 for 57 degrees of freedom # Null hypothesis probability = 6.738922e-01 Photon flux (15-150 keV) in 1 sec: 2.82388 ( -0.25007 0.2506 ) ph/cm2/s Energy fluence (15-150 keV) : 2.85838e-07 ( -2.64798e-08 2.66332e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.200 sec. to 0.800 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.588504 ( -0.295103 0.652056 ) Epeak [keV] : 371.959 ( -371.963 -371.963 ) Norm@50keV : 3.07523E-02 ( -0.00796558 0.0269339 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.26 using 59 PHA bins. # Reduced chi-squared = 0.9154 for 56 degrees of freedom # Null hypothesis probability = 6.544868e-01 Photon flux (15-150 keV) in 1 sec: 2.80094 ( -0.25692 0.25645 ) ph/cm2/s Energy fluence (15-150 keV) : 2.82872e-07 ( -2.823e-08 2.77842e-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 = -6.298865960649478E-01, IMY = -1.600419800630581E-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: -622.015400 -607.935600 -179.216000 0.148000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.0508 38.2967 7.5 44.1 172.4 1.4792 1.5 5.9 Cyg X-2 347.6080 -19.7774 2.1 19.9 26.2 2.2849 5.5 ------ UNKNOWN 334.9685 32.3721 2.4 35.3 177.4 2.6482 4.9 ------ UNKNOWN 336.3142 35.8732 2.8 38.0 -178.5 2.4346 4.2 ------ UNKNOWN 352.2759 18.7170 3.6 18.8 -153.6 1.4004 3.3 ------ UNKNOWN 8.0449 -20.3412 2.8 27.0 -20.2 1.8241 4.0 ------ UNKNOWN 3.1404 36.8509 3.5 38.8 -143.4 2.3077 3.3 ------ UNKNOWN 19.9767 39.4655 2.3 48.0 -129.1 10.5793 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.148000 0.448000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.1025 38.2487 7.0 44.1 172.5 0.0379 1.7 5.5 Cyg X-2 306.5985 13.4103 1.8 45.0 128.8 0.3453 6.5 ------ UNKNOWN 330.0519 26.9135 0.5 33.0 165.7 0.3697 22.9 ------ UNKNOWN 327.7791 32.8918 2.1 39.0 169.3 0.0957 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 68.284600 950.284610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5823 35.2029 0.5 27.3 118.0 22.4451 23.1 0.4 Cyg X-1 308.0830 40.9497 1.1 22.9 136.2 8.4825 10.2 1.2 Cyg X-3 326.3247 38.1819 5.7 11.7 168.2 1.4109 2.0 11.1 Cyg X-2 26.1658 48.1687 2.8 48.0 -129.1 16.6514 4.1 ------ UNKNOWN