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: Sun Jan 12 01:19:52 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger558271
======================================================================
Trigger: 00558271 Segment: 000
BAT Trigger Time: 392982296 [s; MET]
Trigger Stop: 392982360 [s; MET]
UTC: 2013-06-15T09:44:45.323280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.845688282276 Dec: -68.1660059730103 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7
Analysis Position: [ source = BAT ]
RA: 274.845688282276 Dec: -68.1660059730103 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 274.965997488142 Dec: -68.161737114086 [deg; J2000]
{ 18h 19m 51.8s , -68d 09' 42.3" }
+/- 2.93479257968317 [arcmin] (estimated 90% radius based on SNR)
+/- 1.78163300852858 [arcmin] (formal 1-sigma fit error)
SNR: 6.5335714988501
Angular difference between the analysis and refined position is 2.697153 arcmin
Partial Coding Fraction: 0.6015625 [ including projection effects ]
Duration
T90: 332.555999934673 +/- 28.5450627551655
Measured from: 32.7400000095367
to: 365.29599994421 [s; relative to TRIGTIME]
T50: 73.5319999456406 +/- 112.530690988043
Measured from: 72.3320000171661
to: 145.863999962807 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 31.8439999818802
to: 32.8439999818802 [s; relative to TRIGTIME]
Total Fluence
Measured from: 25.5720000267029
to: 386.864000022411 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.640087 1.858918 0.763030 0.202395
0.133598 0.128890 0.108756 0.093912 [error]
Peak 0.018953 0.047958 0.007893 0.006940
0.009781 0.009428 0.007746 0.006369 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 361.292 25.572 386.864
T90 332.556 32.740 365.296
T50 73.532 72.332 145.864
Peak 1.000 31.844 32.844
====== 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 -2.091 -0.160 0.154 - - - 6.84e-04 -7.53e-05 7.43e-05 70.310 57
CPL -0.718 -0.823 1.034 35.484 -7.278 6.606 4.70e-03 -4.70e-03 1.61e-02 61.080 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 -2.044 -0.622 0.541 - - - 4.81e-03 -1.94e-03 1.86e-03 52.590 57
CPL 2.051 -4.347 -2.051 34.371 -10.210 177.578 1.92e+00 -1.92e+00 4.66e+05 50.310 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 5.51e-07 7.08e-07 6.65e-07 1.10e-06 2.29e-06 3.02e-06 erg/cm2
90%_error_low -6.39e-08 -6.11e-08 -9.77e-08 -2.86e-07 -2.29e-07 -4.11e-07 erg/cm2
90%_error_hi 6.51e-08 6.11e-08 1.00e-07 3.47e-07 2.33e-07 4.56e-07 erg/cm2
Peak flux PL 3.35e-01 2.45e-01 1.19e-01 8.15e-02 7.37e-01 7.79e-01 ph/cm2/s
90%_error_low -1.44e-01 -7.99e-02 -5.79e-02 -8.15e-02 -2.42e-01 -2.55e-01 ph/cm2/s
90%_error_hi 1.56e-01 7.99e-02 6.09e-02 1.00e-01 2.42e-01 2.55e-01 ph/cm2/s
Fluence CPL 5.09e-07 8.20e-07 5.60e-07 1.32e-07 2.00e-06 2.02e-06 erg/cm2
90%_error_low -7.16e-08 -8.84e-08 -1.48e-07 -9.67e-08 -2.43e-07 -2.62e-07 erg/cm2
90%_error_hi 7.16e-08 9.07e-08 1.37e-07 2.82e-07 2.69e-07 3.76e-07 erg/cm2
Peak flux CPL 2.42e-01 3.66e-01 3.58e-02 3.04e-05 6.43e-01 6.45e-01 ph/cm2/s
90%_error_low -1.52e-01 -1.50e-01 -3.58e-02 -3.04e-05 -2.34e-01 -2.36e-01 ph/cm2/s
90%_error_hi 1.94e-01 1.35e-01 1.26e-01 1.07e-01 2.62e-01 2.60e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 274.9660 -68.1617 0.0294 39.4425 -12.8425 1.1509258 6.534 TRIG_00558271 Foreground time interval of the image: 25.572 73.301 (delta_t = 47.729 [sec]) Background time interval of the image: -13.299 25.572 (delta_t = 38.871 [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 25.572 sec. to 386.864 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.09102 ( -0.160297 0.153755 ) Norm@50keV : 6.83922E-04 ( -7.53294e-05 7.43192e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.31 using 59 PHA bins. # Reduced chi-squared = 1.233 for 57 degrees of freedom # Null hypothesis probability = 1.108433e-01 Photon flux (15-150 keV) in 361.3 sec: 0.107133 ( -0.0091766 0.009179 ) ph/cm2/s Energy fluence (15-150 keV) : 2.29429e-06 ( -2.29155e-07 2.33368e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 25.572 sec. to 386.864 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.717616 ( -0.82312 1.03427 ) Epeak [keV] : 35.4842 ( -7.27755 6.60606 ) Norm@50keV : 4.69568E-03 ( -0.00469718 0.0161482 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.08 using 59 PHA bins. # Reduced chi-squared = 1.091 for 56 degrees of freedom # Null hypothesis probability = 2.985053e-01 Photon flux (15-150 keV) in 361.3 sec: 0.102442 ( -0.009448 0.009491 ) ph/cm2/s Energy fluence (15-150 keV) : 1.99723e-06 ( -2.42793e-07 2.6876e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 31.844 sec. to 32.844 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.04449 ( -0.621952 0.540216 ) Norm@50keV : 4.80881E-03 ( -0.00194347 0.00186214 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.59 using 59 PHA bins. # Reduced chi-squared = 0.9226 for 57 degrees of freedom # Null hypothesis probability = 6.411046e-01 Photon flux (15-150 keV) in 1 sec: 0.736526 ( -0.241882 0.242334 ) ph/cm2/s Energy fluence (15-150 keV) : 4.44816e-08 ( -1.6184e-08 1.69144e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.844 sec. to 32.844 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 4.51778 ( -5.32612 -3.02951 ) Epeak [keV] : 33.1228 ( -9.60543 178.182 ) Norm@50keV : 81.8338 ( -85.2384 466271 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.13 using 59 PHA bins. # Reduced chi-squared = 0.8952 for 56 degrees of freedom # Null hypothesis probability = 6.954814e-01 Photon flux (15-150 keV) in 1 sec: 0.643270 ( -0.234367 0.262165 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 332.556 sec. Hardness ratio (energy fluence ratio) = 0.938901462754
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.2594835e-06 S(50-150 keV) = 1.0348312e-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 = 8.020726844248932E-01, IMY = 1.828526217484349E-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: -13.299400 25.572000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9607 -15.6249 0.7 23.9 111.6 1.7850 15.8 1.4 Sco X-1 255.9639 -37.7864 12.2 12.4 34.4 0.0787 0.9 3.6 4U 1700-377 256.2729 -36.3297 13.2 11.2 39.1 0.0690 0.9 9.6 GX 349+2 262.8463 -24.7217 4.0 5.4 134.7 0.2171 2.9 9.0 GX 1+4 264.9000 -44.6002 5.9 15.6 -3.8 0.1456 1.9 11.2 4U 1735-44 268.5203 -1.3199 0.0 27.8 176.6 0.1014 1.1 12.1 SW J1753.5-0127 270.4272 -25.1916 3.1 5.2 -144.3 -0.2757 -3.8 10.3 GX 5-1 270.4536 -25.8816 5.6 4.8 -138.5 -0.1545 -2.1 11.6 GRS 1758-258 274.1654 -13.9019 0.0 16.7 -160.9 0.1515 2.0 12.3 GX 17+2 276.0998 -30.3557 4.0 8.5 -86.6 -0.2201 -2.9 9.1 H1820-303 284.8677 -24.7760 0.0 17.0 -108.1 0.3438 4.1 12.6 HT1900.1-2455 288.8439 10.8451 3.8 45.4 -156.1 0.4476 3.1 6.6 GRS 1915+105 262.8401 -33.8574 3.3 5.7 23.8 0.2610 3.5 7.6 GX 354-0 335.5453 -82.5474 2.2 58.5 -16.0 2.2027 5.2 ------ UNKNOWN 294.0474 -18.9155 2.4 27.1 -113.6 0.4693 4.8 ------ UNKNOWN 294.4732 13.5811 2.1 50.5 -151.6 1.0912 5.5 ------ UNKNOWN 317.0212 -44.4732 2.3 42.6 -62.4 1.5108 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 25.572000 73.300590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8508 -15.5413 7.5 24.0 111.7 -0.2792 -1.5 9.5 Sco X-1 256.1501 -37.9411 5.3 12.3 33.4 0.2713 2.2 9.7 4U 1700-377 256.6550 -36.3130 0.0 11.0 38.1 0.2616 2.1 12.5 GX 349+2 262.8979 -24.6534 3.6 5.4 135.6 -0.3759 -3.2 8.2 GX 1+4 264.8690 -44.5599 6.8 15.6 -3.7 -0.1990 -1.7 8.5 4U 1735-44 268.5203 -1.3200 0.0 27.8 176.6 -0.0795 -0.6 12.1 SW J1753.5-0127 270.4447 -25.1273 2.7 5.3 -144.6 0.4959 4.4 9.2 GX 5-1 270.1778 -25.5801 7.5 4.8 -143.2 0.1843 1.6 11.9 GRS 1758-258 273.8459 -14.1708 0.0 16.4 -161.6 0.2978 2.5 12.3 GX 17+2 276.1052 -30.2706 5.1 8.5 -87.2 0.2745 2.3 11.0 H1820-303 284.8677 -24.7760 0.0 17.0 -108.1 -0.2604 -2.0 12.6 HT1900.1-2455 288.9074 11.0378 2.8 45.6 -156.2 0.9524 4.2 8.5 GRS 1915+105 262.7817 -33.9569 0.0 5.8 23.6 -0.0744 -0.6 12.7 GX 354-0 274.9659 -68.1618 1.8 39.4 -12.8 1.1497 6.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 161.700600 963.088100 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4677 -60.5678 241.2 40.3 -28.3 0.0393 0.0 5.6 Cen X-3 186.7825 -62.5815 6.7 33.9 -20.2 -1.0521 -1.7 11.8 GX 301-2 256.0217 -37.8605 2.4 32.0 75.7 4.9317 4.9 1.9 4U 1700-377 256.3112 -36.4471 6.8 33.3 76.6 1.8683 1.7 6.2 GX 349+2 264.5857 -44.4448 12.0 24.3 86.4 0.7833 1.0 6.7 4U 1735-44 275.8097 -30.4099 8.6 37.7 105.7 2.0392 1.4 6.5 H1820-303 263.0239 -33.9826 5.4 34.8 87.1 2.6856 2.1 9.0 GX 354-0 318.2437 -44.4284 3.0 32.6 170.1 2.7680 3.9 ------ UNKNOWN 224.8527 -59.7648 2.8 22.7 11.2 2.2146 4.2 ------ UNKNOWN 286.3016 -64.4996 2.6 5.9 161.5 2.2620 4.5 ------ UNKNOWN 356.0952 -29.5599 4.4 59.6 -161.6 17.1477 2.6 ------ UNKNOWN 141.4576 -56.5278 4.6 50.7 -44.5 9.3697 2.5 ------ UNKNOWN 19.1074 -50.9567 3.0 48.5 -130.3 12.6038 3.8 ------ UNKNOWN