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: Sat May 9 18:55:13 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger361831
======================================================================
Trigger: 00361831 Segment: 000
BAT Trigger Time: 273720263.168 [s; MET]
Trigger Stop: 273720267.264 [s; MET]
UTC: 2009-09-04T01:24:18.112980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.191456096339 Dec: -25.2122851571245 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.98
Image Trigger?: NO
Rate S/N Ratio: 16.7332005306815 [ if not an image trigger ]
Image S/N Ratio: 7.98
Analysis Position: [ source = BAT ]
RA: 264.191456096339 Dec: -25.2122851571245 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 264.194989970473 Dec: -25.2153248171904 [deg; J2000]
{ 17h 36m 46.8s , -25d 12' 55.2" }
+/- 1.23622447529625 [arcmin] (estimated 90% radius based on SNR)
+/- 0.478353652224521 [arcmin] (formal 1-sigma fit error)
SNR: 22.4672932930081
Angular difference between the analysis and refined position is 0.264691 arcmin
Partial Coding Fraction: 0.08886719 [ including projection effects ]
Duration
T90: 64 +/- 16
Measured from: -15.1679999828339
to: 48.8320000171661 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: 0.832000017166138
to: 32.8320000171661 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.33200001716614
to: 9.33200001716614 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.1679999828339
to: 64.8320000171661 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.184649 6.527371 5.351663 1.992180
0.236600 0.237249 0.212953 0.191607 [error]
Peak 0.083382 0.136115 0.057899 0.062064
0.025162 0.028245 0.026450 0.020986 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 80.000 -15.168 64.832
T90 64.000 -15.168 48.832
T50 32.000 0.832 32.832
Peak 1.000 8.332 9.332
====== 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 -1.564 -0.076 0.076 - - - 1.69e-02 -6.88e-04 6.88e-04 48.360 57
CPL -1.565 -0.074 0.141 9999.360 -9999.360 -9999.360 1.69e-02 -6.70e-04 3.08e-03 48.400 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 -1.877 -0.550 0.483 - - - 1.93e-02 -6.38e-03 6.08e-03 66.250 57
CPL -0.877 -1.288 5.565 50.106 -41.420 -50.106 6.85e-02 -6.85e-02 9.44e+01 65.860 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 1.83e-06 3.23e-06 4.38e-06 1.22e-05 1.27e-05 2.16e-05 erg/cm2
90%_error_low -1.46e-07 -1.53e-07 -2.20e-07 -1.34e-06 -5.38e-07 -1.47e-06 erg/cm2
90%_error_hi 1.51e-07 1.52e-07 2.19e-07 1.45e-06 5.39e-07 1.55e-06 erg/cm2
Peak flux PL 1.14e+00 9.19e-01 5.00e-01 3.99e-01 2.74e+00 2.96e+00 ph/cm2/s
90%_error_low -4.67e-01 -2.65e-01 -2.07e-01 -2.49e-01 -7.94e-01 -8.43e-01 ph/cm2/s
90%_error_hi 5.21e-01 2.64e-01 2.05e-01 3.95e-01 7.97e-01 8.44e-01 ph/cm2/s
Fluence CPL 1.83e-06 3.23e-06 4.33e-06 1.37e-05 1.28e-05 2.18e-05 erg/cm2
90%_error_low N/A -1.53e-07 N/A N/A -6.23e-07 -3.15e-06 erg/cm2
90%_error_hi N/A 1.52e-07 N/A N/A 4.53e-07 1.53e-06 erg/cm2
Peak flux CPL 1.00e+00 1.02e+00 5.13e-01 1.35e-01 2.64e+00 2.68e+00 ph/cm2/s
90%_error_low N/A -3.49e-01 N/A -1.35e-01 -8.78e-01 -9.11e-01 ph/cm2/s
90%_error_hi N/A 4.31e-01 N/A 2.96e-01 8.40e-01 1.07e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 264.1950 -25.2153 0.0086 52.5638 166.9460 17.5576724 22.467 TRIG_00361831 Foreground time interval of the image: -15.168 50.733 (delta_t = 65.901 [sec]) Background time interval of the image: -56.467 -15.168 (delta_t = 41.299 [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 -15.168 sec. to 64.832 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.56357 ( -0.0763904 0.0763854 ) Norm@50keV : 1.68694E-02 ( -0.000687509 0.000687436 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.36 using 59 PHA bins. # Reduced chi-squared = 0.8484 for 57 degrees of freedom # Null hypothesis probability = 7.855262e-01 Photon flux (15-150 keV) in 80 sec: 2.14411 ( -0.09806 0.09848 ) ph/cm2/s Energy fluence (15-150 keV) : 1.26823e-05 ( -5.3753e-07 5.38549e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.168 sec. to 64.832 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.5645 ( -0.0739326 0.140324 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 1.68935E-02 ( -0.000688339 0.00305887 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.40 using 59 PHA bins. # Reduced chi-squared = 0.8642 for 56 degrees of freedom # Null hypothesis probability = 7.549573e-01 Photon flux (15-150 keV) in 80 sec: 2.16381 ( -0.11806 0.07851 ) ph/cm2/s Energy fluence (15-150 keV) : 1.27656e-05 ( -6.23047e-07 4.52529e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.332 sec. to 9.332 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.87721 ( -0.54962 0.483246 ) Norm@50keV : 1.92666E-02 ( -0.00638483 0.00608031 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.25 using 59 PHA bins. # Reduced chi-squared = 1.162 for 57 degrees of freedom # Null hypothesis probability = 1.879807e-01 Photon flux (15-150 keV) in 1 sec: 2.73876 ( -0.79432 0.79725 ) ph/cm2/s Energy fluence (15-150 keV) : 1.77145e-07 ( -5.60183e-08 5.74669e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.332 sec. to 9.332 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.876954 ( -1.29236 5.56119 ) Epeak [keV] : 50.1063 ( -41.3656 -50.0518 ) Norm@50keV : 6.84925E-02 ( -0.0691575 94.3607 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.86 using 59 PHA bins. # Reduced chi-squared = 1.176 for 56 degrees of freedom # Null hypothesis probability = 1.725842e-01 Photon flux (15-150 keV) in 1 sec: 2.64268 ( -0.87767 0.83974 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 64.0 sec. Hardness ratio (energy fluence ratio) = 1.35328705693
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.062376e-06 S(50-150 keV) = 7.620013e-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 = -1.272480387655472E+00, IMY = -2.950394380625843E-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: -56.467380 -15.168000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9853 -15.6412 0.9 47.2 -167.3 1.9264 13.2 0.3 Sco X-1 254.3246 35.5063 9.3 12.2 -59.4 0.0983 1.2 11.8 Her X-1 263.0046 -24.8396 3.9 52.2 168.3 0.8902 3.0 5.6 GX 1+4 268.4568 -1.4474 3.4 29.0 158.9 0.3137 3.4 5.3 SW J1753.5-0127 270.4445 -25.0044 5.8 52.6 159.8 0.8219 2.0 9.8 GX 5-1 270.1792 -25.7475 521.6 53.3 160.2 0.0100 0.0 6.7 GRS 1758-258 274.1904 -13.9194 0.0 42.2 152.7 0.2116 1.1 12.8 GX 17+2 288.8264 10.9372 11.3 27.8 107.6 0.1166 1.0 1.7 GRS 1915+105 299.5904 35.1838 0.9 30.4 52.4 1.5160 13.1 1.1 Cyg X-1 308.1089 40.8088 14.8 37.7 43.8 0.1299 0.8 8.6 Cyg X-3 270.3991 -2.8317 2.0 30.6 155.4 0.5729 5.7 ------ UNKNOWN 258.5448 -12.5699 3.3 40.4 175.8 0.4289 3.5 ------ UNKNOWN 250.4482 -10.1100 2.2 40.0 -171.3 0.5804 5.2 ------ UNKNOWN 223.9656 71.5699 2.5 49.6 -29.8 0.9261 4.7 ------ UNKNOWN 222.7348 9.1516 2.7 43.8 -120.3 1.3823 4.4 ------ UNKNOWN 211.8631 54.7760 2.8 47.0 -53.1 1.4382 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -15.168000 50.732600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9547 -15.6365 23.2 47.2 -167.2 0.1594 0.5 1.4 Sco X-1 254.5030 35.3724 15.3 12.0 -59.5 -0.1169 -0.8 2.9 Her X-1 262.9658 -24.7787 6.0 52.2 168.4 -1.4338 -1.9 3.1 GX 1+4 268.5184 -1.3342 5.9 28.9 158.7 -0.3748 -2.0 11.5 SW J1753.5-0127 270.3232 -25.1086 15.9 52.7 160.0 0.7278 0.7 2.8 GX 5-1 270.2967 -25.7521 20.9 53.3 160.1 0.6348 0.6 0.6 GRS 1758-258 274.1685 -13.9702 4.9 42.3 152.7 -0.8739 -2.4 10.3 GX 17+2 288.7566 10.9006 7.5 27.7 107.8 0.3744 1.5 3.6 GRS 1915+105 299.4993 35.3255 6.1 30.4 52.1 0.4430 1.9 8.7 Cyg X-1 308.0653 41.0414 20.2 37.7 43.4 0.1883 0.6 5.7 Cyg X-3 264.9710 -26.5733 3.4 53.9 166.1 3.2491 3.4 ------ UNKNOWN 264.1950 -25.2153 0.5 52.6 166.9 17.5565 22.4 ------ UNKNOWN 232.1049 42.1485 2.3 30.5 -66.4 1.1527 5.1 ------ UNKNOWN 201.6087 74.9628 2.2 56.9 -30.0 4.4756 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 118.332610 482.892000 660.832000 722.951800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9790 -15.6392 0.2 20.4 -67.3 27.2160 60.4 0.1 Sco X-1 256.1465 -37.7814 3.3 14.3 -155.1 1.2798 3.5 8.5 4U 1700-377 256.4141 -36.4451 3.4 13.1 -152.9 1.2685 3.4 1.7 GX 349+2 262.9704 -24.7552 5.3 1.2 -70.0 0.9124 2.2 2.2 GX 1+4 264.7343 -44.5253 5.6 19.3 177.2 0.7725 2.0 4.5 4U 1735-44 268.3620 -1.4666 2.7 24.1 8.6 1.9220 4.2 0.9 SW J1753.5-0127 270.3074 -25.1098 2.1 5.5 88.7 1.9486 5.3 2.2 GX 5-1 270.1361 -25.7501 6.0 5.4 95.4 0.7184 2.0 9.0 GRS 1758-258 273.9771 -14.0149 3.1 14.5 39.6 1.5253 3.7 2.1 GX 17+2 275.7615 -30.3713 5.2 11.5 117.8 0.8192 2.2 8.5 H1820-303 285.0980 -25.0563 3.0 18.9 92.4 1.8749 3.9 8.8 HT1900.1-2455 288.8436 11.0240 6.0 43.5 34.9 1.6838 1.9 5.4 GRS 1915+105 263.0092 -33.6853 5.3 8.5 -175.0 0.7943 2.2 9.0 GX 354-0 309.0895 -28.2987 3.0 40.0 103.1 6.1223 3.8 ------ UNKNOWN 304.9278 -20.3652 3.3 37.7 89.5 4.8147 3.4 ------ UNKNOWN 268.2991 -50.1315 3.2 25.1 172.1 1.6045 3.5 ------ UNKNOWN 259.7282 -82.0794 3.1 56.9 179.1 9.8392 3.7 ------ UNKNOWN 260.1485 27.6201 2.4 53.0 -6.2 4.9831 4.9 ------ UNKNOWN 251.4992 0.5910 2.8 28.6 -29.0 1.7189 4.1 ------ UNKNOWN 247.4027 7.9388 2.9 37.0 -30.1 2.1027 3.9 ------ UNKNOWN 200.4530 -73.5635 2.1 58.6 -164.4 13.4783 5.5 ------ UNKNOWN