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: Mon Jan 20 10:06:39 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger277582
======================================================================
Trigger: 00277582 Segment: 000
BAT Trigger Time: 199508946.368 [s; MET]
Trigger Stop: 199508946.752 [s; MET]
UTC: 2007-04-29T03:09:04.446800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 328.024078768624 Dec: -38.8438832424751 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8
Image Trigger?: NO
Rate S/N Ratio: 18.3575597506858 [ if not an image trigger ]
Image S/N Ratio: 8
Analysis Position: [ source = BAT ]
RA: 328.024078768624 Dec: -38.8438832424751 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 328.020664983542 Dec: -38.8516608361705 [deg; J2000]
{ 21h 52m 05.0s , -38d 51' 06.0" }
+/- 1.86738401901006 [arcmin] (estimated 90% radius based on SNR)
+/- 0.815503421875004 [arcmin] (formal 1-sigma fit error)
SNR: 12.4635498350436
Angular difference between the analysis and refined position is 0.493168 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 0.488000005483627 +/- 0.0430813393540356
Measured from: -0.196000009775162
to: 0.291999995708466 [s; relative to TRIGTIME]
T50: 0.364000022411346 +/- 0.055569781312264
Measured from: -0.136000007390976
to: 0.22800001502037 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.437999993562698
to: 0.562000006437302 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.208000004291534
to: 0.328000009059906 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.034408 0.043151 0.028294 0.003328
0.004792 0.005206 0.004487 0.003449 [error]
Peak 0.046337 0.051856 0.028457 0.005098
0.006318 0.006574 0.005682 0.004481 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.536 -0.208 0.328
T90 0.488 -0.196 0.292
T50 0.364 -0.136 0.228
Peak 1.000 -0.438 0.562
====== 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 -1.645 -0.227 0.220 - - - 1.31e-02 -1.91e-03 1.88e-03 65.180 57
CPL -1.099 -0.721 1.245 72.852 -25.966 -72.852 2.65e-02 -1.50e-02 1.11e-01 64.240 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 -1.836 -0.249 0.236 - - - 7.90e-03 -1.35e-03 1.32e-03 64.600 57
CPL -0.371 -1.308 1.916 43.586 -8.997 43.149 6.03e-02 -6.03e-02 8.74e-01 60.860 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 1.03e-08 1.72e-08 2.21e-08 5.66e-08 6.52e-08 1.06e-07 erg/cm2
90%_error_low -2.01e-09 -2.29e-09 -4.21e-09 -1.92e-08 -1.00e-08 -2.38e-08 erg/cm2
90%_error_hi 2.07e-09 2.29e-09 4.22e-09 2.47e-08 1.02e-08 2.82e-08 erg/cm2
Peak flux PL 4.50e-01 3.71e-01 2.08e-01 1.72e-01 1.10e+00 1.20e+00 ph/cm2/s
90%_error_low -8.79e-02 -5.25e-02 -4.50e-02 -6.15e-02 -1.56e-01 -1.73e-01 ph/cm2/s
90%_error_hi 9.07e-02 5.25e-02 4.57e-02 7.96e-02 1.56e-01 1.74e-01 ph/cm2/s
Fluence CPL 9.77e-09 1.86e-08 2.21e-08 2.27e-08 6.18e-08 7.32e-08 erg/cm2
90%_error_low -2.24e-09 -3.14e-09 -4.97e-09 -1.80e-08 -1.18e-08 -2.19e-08 erg/cm2
90%_error_hi 2.25e-09 3.48e-09 4.61e-09 4.03e-08 1.18e-08 5.73e-08 erg/cm2
Peak flux CPL 4.08e-01 4.41e-01 1.90e-01 2.75e-02 1.06e+00 1.07e+00 ph/cm2/s
90%_error_low -1.01e-01 -8.12e-02 -6.98e-02 -2.75e-02 -1.59e-01 -1.62e-01 ph/cm2/s
90%_error_hi 1.01e-01 8.63e-02 5.92e-02 1.09e-01 1.60e-01 1.72e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 328.0207 -38.8517 0.0154 25.3780 -58.7521 0.1124605 12.464 TRIG_00277582 Foreground time interval of the image: -0.208 0.328 (delta_t = 0.536 [sec]) Background time interval of the image: -165.267 -0.208 (delta_t = 165.059 [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 -0.208 sec. to 0.328 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.64518 ( -0.227075 0.220136 ) Norm@50keV : 1.30708E-02 ( -0.00190965 0.00187761 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.18 using 59 PHA bins. # Reduced chi-squared = 1.144 for 57 degrees of freedom # Null hypothesis probability = 2.135354e-01 Photon flux (15-150 keV) in 0.536 sec: 1.70409 ( -0.22621 0.22628 ) ph/cm2/s Energy fluence (15-150 keV) : 6.52012e-08 ( -1.00386e-08 1.01942e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.208 sec. to 0.328 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.09883 ( -0.721405 1.24466 ) Epeak [keV] : 72.8519 ( -25.8901 -72.7758 ) Norm@50keV : 2.65474E-02 ( -0.0150449 0.110482 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.24 using 59 PHA bins. # Reduced chi-squared = 1.147 for 56 degrees of freedom # Null hypothesis probability = 2.101635e-01 Photon flux (15-150 keV) in 0.536 sec: 1.67856 ( -0.23207 0.23113 ) ph/cm2/s Energy fluence (15-150 keV) : 6.17585e-08 ( -1.18269e-08 1.1797e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.438 sec. to 0.562 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.83598 ( -0.248678 0.235974 ) Norm@50keV : 7.90359E-03 ( -0.00134905 0.00131953 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.60 using 59 PHA bins. # Reduced chi-squared = 1.133 for 57 degrees of freedom # Null hypothesis probability = 2.283204e-01 Photon flux (15-150 keV) in 1 sec: 1.10472 ( -0.156276 0.15629 ) ph/cm2/s Energy fluence (15-150 keV) : 7.27009e-08 ( -1.22768e-08 1.25875e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.438 sec. to 0.562 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.370597 ( -1.30859 1.91545 ) Epeak [keV] : 43.5858 ( -8.99171 43.1545 ) Norm@50keV : 6.03227E-02 ( -0.0604063 0.873754 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.86 using 59 PHA bins. # Reduced chi-squared = 1.087 for 56 degrees of freedom # Null hypothesis probability = 3.051910e-01 Photon flux (15-150 keV) in 1 sec: 1.06252 ( -0.159315 0.16044 ) ph/cm2/s Energy fluence (15-150 keV) : 6.22874e-08 ( -1.26579e-08 1.51409e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.488 sec. Hardness ratio (energy fluence ratio) = 1.27888055292
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.749696e-08 S(50-150 keV) = 3.770251e-08
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 = 2.460721638085664E-01, IMY = 4.055484913668132E-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: -165.267410 -0.208000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 256.0689 -37.9349 26.4 34.1 76.8 0.1231 0.4 6.7 4U 1700-377 256.5123 -36.5752 9.1 33.9 79.3 -0.3721 -1.3 9.9 GX 349+2 262.9840 -24.8244 6.9 31.2 103.0 0.4306 1.7 4.9 GX 1+4 264.8647 -44.3334 10.2 28.1 63.3 0.2180 1.1 8.7 4U 1735-44 268.4520 -1.3481 42.3 41.5 140.5 -0.1072 -0.3 8.0 SW J1753.5-0127 270.2889 -25.0590 2.3 25.0 108.0 0.8914 4.9 1.2 GX 5-1 270.4493 -25.8900 0.0 24.6 106.3 0.2653 1.5 11.9 GRS 1758-258 273.9518 -14.0761 13.9 28.3 132.8 0.1556 0.8 3.9 GX 17+2 275.9067 -30.3910 3.3 18.6 98.4 0.5155 3.5 1.7 H1820-303 285.2024 -25.0392 3.8 13.2 128.9 -0.3666 -3.0 11.5 HT1900.1-2455 288.8156 10.9389 1.1 44.2 175.5 2.5021 10.0 1.1 GRS 1915+105 262.9668 -33.7142 3.9 29.0 85.8 0.6536 3.0 7.3 GX 354-0 356.6698 -41.5522 4.3 47.1 -53.2 2.2084 2.7 ------ UNKNOWN 331.0474 0.1642 3.1 45.3 -121.3 2.8143 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.208000 0.328000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.8322 -37.7221 7.3 34.4 77.2 0.0228 1.6 10.4 4U 1700-377 256.5819 -36.5655 8.9 33.8 79.3 0.0182 1.3 11.1 GX 349+2 263.1805 -24.7243 11.9 31.1 103.3 0.0114 1.0 9.4 GX 1+4 264.7550 -44.3921 686.3 28.2 63.3 0.0002 0.0 3.5 4U 1735-44 268.2335 -1.4745 7.3 41.5 140.2 -0.0292 -1.6 8.2 SW J1753.5-0127 270.1013 -25.2058 0.0 25.1 107.5 -0.0129 -1.4 12.5 GX 5-1 270.4860 -25.6166 0.0 24.6 107.0 -0.0097 -1.1 12.5 GRS 1758-258 274.0813 -13.9940 13.3 28.3 133.1 -0.0084 -0.9 5.1 GX 17+2 276.0909 -30.4638 2700.0 18.5 98.3 0.0000 0.0 10.4 H1820-303 285.0681 -25.0117 7.2 13.3 128.7 0.0120 1.6 5.7 HT1900.1-2455 288.9120 10.9038 5.5 44.1 175.6 0.0277 2.1 7.1 GRS 1915+105 263.0197 -33.9745 4.2 28.9 85.3 0.0290 2.8 8.5 GX 354-0 272.2113 -0.9007 2.4 39.6 145.6 0.0685 4.8 ------ UNKNOWN 292.7366 11.9320 2.3 44.6 -178.9 0.0667 5.1 ------ UNKNOWN 328.0207 -38.8517 0.9 25.4 -58.8 0.1125 12.5 ------ UNKNOWN 308.1343 24.8955 1.9 58.2 -160.8 0.2572 6.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 228.332590 962.654100 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 285.0202 -25.0517 11.4 38.6 123.0 -0.8540 -1.0 7.9 HT1900.1-2455 284.4977 -29.7187 2.7 36.7 115.9 3.2554 4.2 ------ UNKNOWN 293.9803 -71.5944 2.5 37.0 42.1 2.5632 4.6 ------ UNKNOWN 308.4216 -65.0131 2.6 28.5 42.3 1.6906 4.5 ------ UNKNOWN 58.4027 -70.7947 2.8 53.8 1.0 4.2481 4.1 ------ UNKNOWN 8.9490 -18.1822 3.6 41.0 -83.4 5.9665 3.2 ------ UNKNOWN