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 13 05:03:21 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger518792
======================================================================
Trigger: 00518792 Segment: 000
BAT Trigger Time: 354596787.072 [s; MET]
Trigger Stop: 354596788.48 [s; MET]
UTC: 2012-03-28T03:06:19.032840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 241.549796791991 Dec: -39.3402511024914 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.57
Image Trigger?: NO
Rate S/N Ratio: 13.1909059582729 [ if not an image trigger ]
Image S/N Ratio: 6.57
Analysis Position: [ source = BAT ]
RA: 241.549796791991 Dec: -39.3402511024914 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 241.606988592298 Dec: -39.3221541575653 [deg; J2000]
{ 16h 06m 25.7s , -39d 19' 19.8" }
+/- 1.7695533704008 [arcmin] (estimated 90% radius based on SNR)
+/- 0.724701411119114 [arcmin] (formal 1-sigma fit error)
SNR: 13.4594535820635
Angular difference between the analysis and refined position is 2.867763 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 29.9279999732971 +/- 6.66506352223562
Measured from: -15.9000000357628
to: 14.0279999375343 [s; relative to TRIGTIME]
T50: 12.3359999656677 +/- 2.93431559074022
Measured from: -10.8440000414848
to: 1.49199992418289 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.107999980449677
to: 1.10799998044968 [s; relative to TRIGTIME]
Total Fluence
Measured from: -17.2600000500679
to: 20.5479999780655 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.302021 0.385292 0.187890 0.065593
0.038000 0.033065 0.027693 0.023895 [error]
Peak 0.028965 0.031687 0.031992 0.006983
0.006374 0.005850 0.004904 0.004075 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 37.808 -17.260 20.548
T90 29.928 -15.900 14.028
T50 12.336 -10.844 1.492
Peak 1.000 0.108 1.108
====== 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 -1.867 -0.200 0.194 - - - 1.37e-03 -1.74e-04 1.71e-04 77.140 57
CPL -0.882 -0.908 1.166 46.583 -10.330 60.684 5.10e-03 -5.10e-03 1.97e-02 73.700 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 -1.402 -0.326 0.326 - - - 6.06e-03 -1.08e-03 1.07e-03 63.130 57
CPL -1.190 -1.639 1.210 204.312 -204.312 -204.312 7.64e-03 -2.63e-03 1.84e-02 63.130 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 9.34e-08 1.37e-07 1.50e-07 3.10e-07 4.76e-07 6.91e-07 erg/cm2
90%_error_low -1.49e-08 -1.49e-08 -2.55e-08 -9.44e-08 -5.96e-08 -1.23e-07 erg/cm2
90%_error_hi 1.54e-08 1.49e-08 2.60e-08 1.20e-07 6.07e-08 1.43e-07 erg/cm2
Peak flux PL 2.27e-01 2.42e-01 1.83e-01 2.25e-01 7.38e-01 8.78e-01 ph/cm2/s
90%_error_low -7.14e-02 -4.87e-02 -4.04e-02 -9.00e-02 -1.34e-01 -1.57e-01 ph/cm2/s
90%_error_hi 7.93e-02 4.75e-02 3.96e-02 1.22e-01 1.35e-01 1.59e-01 ph/cm2/s
Fluence CPL 8.58e-08 1.53e-07 1.41e-07 6.56e-08 4.25e-07 4.45e-07 erg/cm2
90%_error_low -1.69e-08 -2.08e-08 -3.52e-08 -4.96e-08 -6.81e-08 -8.56e-08 erg/cm2
90%_error_hi 1.71e-08 2.16e-08 3.13e-08 1.98e-07 7.49e-08 2.08e-07 erg/cm2
Peak flux CPL 2.22e-01 2.44e-01 1.85e-01 2.01e-01 7.34e-01 8.52e-01 ph/cm2/s
90%_error_low -9.02e-02 -5.01e-02 -4.21e-02 -2.01e-01 -1.42e-01 -2.19e-01 ph/cm2/s
90%_error_hi 4.53e-02 5.28e-02 4.62e-02 9.39e-02 1.38e-01 1.82e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 241.6070 -39.3222 0.0143 10.8068 2.0572 0.9263590 13.459 TRIG_00518792 Foreground time interval of the image: -17.260 20.548 (delta_t = 37.808 [sec]) Background time interval of the image: -239.072 -17.260 (delta_t = 221.812 [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 -17.260 sec. to 20.548 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.86726 ( -0.200155 0.193913 ) Norm@50keV : 1.36853E-03 ( -0.000173906 0.000171089 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 77.14 using 59 PHA bins. # Reduced chi-squared = 1.353 for 57 degrees of freedom # Null hypothesis probability = 3.902349e-02 Photon flux (15-150 keV) in 37.81 sec: 0.193736 ( -0.021222 0.021245 ) ph/cm2/s Energy fluence (15-150 keV) : 4.75782e-07 ( -5.95969e-08 6.07387e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.260 sec. to 20.548 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.881969 ( -0.908515 1.16592 ) Epeak [keV] : 46.5829 ( -10.3289 60.6852 ) Norm@50keV : 5.09928E-03 ( -0.00509995 0.0197131 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 73.70 using 59 PHA bins. # Reduced chi-squared = 1.316 for 56 degrees of freedom # Null hypothesis probability = 5.657957e-02 Photon flux (15-150 keV) in 37.81 sec: 0.185594 ( -0.022368 0.022465 ) ph/cm2/s Energy fluence (15-150 keV) : 4.24754e-07 ( -6.80837e-08 7.49088e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.108 sec. to 1.108 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.40239 ( -0.325935 0.326036 ) Norm@50keV : 6.05572E-03 ( -0.00107514 0.001071 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.13 using 59 PHA bins. # Reduced chi-squared = 1.107 for 57 degrees of freedom # Null hypothesis probability = 2.688608e-01 Photon flux (15-150 keV) in 1 sec: 0.737889 ( -0.134178 0.135004 ) ph/cm2/s Energy fluence (15-150 keV) : 5.84925e-08 ( -1.14121e-08 1.15804e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.108 sec. to 1.108 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.28751 ( -1.62693 1.22136 ) Epeak [keV] : 330.765 ( -260.938 -260.938 ) Norm@50keV : 6.86057E-03 ( -0.00175043 0.0193139 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.10 using 59 PHA bins. # Reduced chi-squared = 1.127 for 56 degrees of freedom # Null hypothesis probability = 2.398027e-01 Photon flux (15-150 keV) in 1 sec: 0.733796 ( -0.141799 0.138106 ) ph/cm2/s Energy fluence (15-150 keV) : 3.11882e-08 ( -1.4392e-08 1.01318e-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 = 1.907596990060531E-01, IMY = -6.852290622875360E-03
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: -239.072000 -17.260000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.6123 -62.8088 3.1 50.6 10.6 2.4332 3.7 2.6 GX 301-2 244.9791 -15.6426 0.2 13.9 152.0 13.4082 65.0 0.1 Sco X-1 255.8547 -37.6637 0.0 11.1 -60.1 0.2268 1.0 12.5 4U 1700-377 256.4814 -36.4595 5.3 10.7 -66.6 0.4684 2.2 3.1 GX 349+2 263.0177 -24.7609 340.5 15.1 -124.5 -0.0069 -0.0 1.0 GX 1+4 264.6434 -44.5041 3.0 20.6 -58.4 0.8754 3.8 5.4 4U 1735-44 268.3856 -1.4906 2.4 34.6 -160.1 1.1704 4.8 2.5 SW J1753.5-0127 270.1019 -25.1906 8.2 21.0 -116.3 0.3255 1.4 11.9 GX 5-1 270.1187 -25.8558 0.0 20.8 -114.5 0.0693 0.3 12.0 GRS 1758-258 273.9530 -14.0540 2.9 29.3 -136.0 1.0422 4.0 3.3 GX 17+2 275.8410 -30.4037 5.4 25.0 -100.8 0.5791 2.2 4.9 H1820-303 285.0306 -24.9214 9.8 34.1 -108.6 0.4828 1.2 0.3 HT1900.1-2455 262.8322 -33.7262 102.1 14.2 -88.6 0.0255 0.1 10.2 GX 354-0 195.2890 -32.9440 3.7 43.8 51.4 2.6047 3.1 ------ UNKNOWN 258.1284 22.6319 2.3 53.2 172.7 3.9677 4.9 ------ UNKNOWN 262.6453 25.7272 2.9 57.2 176.6 5.5396 4.0 ------ UNKNOWN 228.1285 -61.9010 2.8 34.7 -4.9 1.0474 4.1 ------ UNKNOWN 293.6411 -23.4427 3.1 42.0 -107.1 3.6061 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -17.260000 20.548000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.7284 -62.7622 4.3 50.6 10.7 -0.5537 -2.7 2.0 GX 301-2 244.7792 -15.7276 0.0 13.8 151.2 0.1741 2.6 12.7 Sco X-1 256.1239 -37.9478 4.2 11.5 -59.8 0.2004 2.7 9.0 4U 1700-377 256.5666 -36.6034 0.0 10.8 -66.2 -0.1159 -1.6 12.5 GX 349+2 263.2010 -24.6376 0.0 15.3 -124.7 0.1080 1.5 12.3 GX 1+4 264.8601 -44.4827 5.6 20.7 -58.8 0.1604 2.0 5.4 4U 1735-44 268.3918 -1.6146 61.2 34.5 -160.0 -0.0164 -0.2 9.8 SW J1753.5-0127 270.3213 -25.2171 12.6 21.2 -116.1 0.0733 0.9 8.5 GX 5-1 270.4661 -25.7601 7.3 21.2 -114.6 -0.1369 -1.7 8.9 GRS 1758-258 273.9199 -13.8703 18.7 29.4 -136.4 -0.0548 -0.6 11.2 GX 17+2 276.1096 -30.2484 0.0 25.3 -101.1 0.2762 3.1 11.9 H1820-303 285.1979 -24.8589 2.8 34.2 -108.6 0.5215 4.1 9.6 HT1900.1-2455 263.1396 -33.7123 6.0 14.5 -88.9 0.1386 1.9 10.5 GX 354-0 241.6070 -39.3221 0.9 10.8 2.1 0.9263 13.5 ------ UNKNOWN 291.1137 -1.1605 2.2 50.7 -135.9 1.8831 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 57.428640 864.128600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2728 -60.5814 13.0 47.6 17.3 1.5232 0.9 2.8 Cen X-3 186.6179 -62.8101 1.6 39.9 13.9 7.4277 7.3 2.6 GX 301-2 244.9708 -15.6427 0.2 23.9 166.4 45.6315 66.8 0.5 Sco X-1 255.9722 -37.9818 8.1 11.3 -114.1 0.9262 1.4 8.3 4U 1700-377 256.2761 -36.3756 3.5 12.0 -121.5 2.0790 3.3 8.2 GX 349+2 262.8836 -24.8637 5.1 23.1 -144.3 1.4832 2.3 9.8 GX 1+4 264.6019 -44.4694 3.5 17.8 -87.6 2.2654 3.3 6.1 4U 1735-44 268.3771 -1.4245 7.3 45.1 -162.2 1.8305 1.6 1.8 SW J1753.5-0127 270.3133 -24.9405 4.3 28.1 -133.9 2.2518 2.7 8.5 GX 5-1 270.4010 -25.6148 2.7 27.8 -132.7 3.5808 4.2 9.4 GRS 1758-258 273.9967 -13.9959 2.4 38.1 -144.3 4.5723 4.7 2.5 GX 17+2 275.8937 -30.2285 9.6 29.4 -119.1 1.0702 1.2 8.5 H1820-303 285.0360 -24.9213 72.1 39.1 -120.1 0.2115 0.2 0.0 HT1900.1-2455 262.9892 -33.9819 14.3 18.0 -122.4 0.4906 0.8 8.8 GX 354-0 187.6470 -52.1394 2.9 38.7 30.7 4.0904 4.0 ------ UNKNOWN 248.3487 13.4197 3.3 53.1 166.5 10.2023 3.5 ------ UNKNOWN 238.5809 -53.0299 2.8 13.8 -14.3 2.4100 4.2 ------ UNKNOWN 283.6358 -39.6233 3.0 32.2 -97.6 3.8331 3.9 ------ UNKNOWN