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 Dec 24 14:20:26 EST 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger301578
======================================================================
Trigger: 00301578 Segment: 000
BAT Trigger Time: 222754919.924 [s; MET]
Trigger Stop: 222754919.988 [s; MET]
UTC: 2008-01-23T04:21:57.402220 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 338.928685995783 Dec: -64.8899237672072 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.04
Image Trigger?: NO
Rate S/N Ratio: 36.9864840178139 [ if not an image trigger ]
Image S/N Ratio: 7.04
Analysis Position: [ source = BAT ]
RA: 338.928685995783 Dec: -64.8899237672072 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 338.929 Dec: -64.8899 [deg; J2000]
{ 22h 35m 43.0s , -64d -53' -23.6" }
+/- 3.01180324954 [arcmin] (estimated 90% radius based on SNR)
SNR: 6.29705086247
Angular difference between the analysis and refined position is 0.008121 arcmin
Partial Coding Fraction: 0.2050781 [ including projection effects ]
Duration
T90: 114.911999970675 +/- 55.267328797349
Measured from: 0.0279999971389771
to: 114.939999967813 [s; relative to TRIGTIME]
T50: 50.2719999849796 +/- 55.9885634028748
Measured from: 8.8120000064373
to: 59.0839999914169 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0480000078678131
to: 0.951999992132187 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0119999945163727
to: 121.131999999285 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.422964 0.284330 0.291417 -0.011039
0.091516 0.087083 0.074064 0.062707 [error]
Peak -0.002709 0.074689 0.068032 0.031129
0.015005 0.015003 0.013920 0.012061 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 121.120 0.012 121.132
T90 114.912 0.028 114.940
T50 50.272 8.812 59.084
Peak 1.000 -0.048 0.952
====== 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 -2.069 -0.546 0.468 - - - 4.95e-04 -1.67e-04 1.55e-04 48.220 57
CPL -1.985 N/A N/A 8.243 N/A N/A 5.50e-04 N/A N/A 48.220 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 -1.130 -0.412 0.443 - - - 1.28e-02 -3.33e-03 3.27e-03 55.030 57
CPL -0.203 -6.449 -1.836 116.436 N/A N/A 3.16e-02 N/A N/A 54.100 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 1.31e-07 1.70e-07 1.62e-07 2.74e-07 5.55e-07 7.38e-07 erg/cm2
90%_error_low -4.51e-08 -4.30e-08 -7.05e-08 -1.79e-07 -1.62e-07 -2.77e-07 erg/cm2
90%_error_hi 4.78e-08 4.27e-08 7.36e-08 3.21e-07 1.69e-07 3.80e-07 erg/cm2
Peak flux PL 3.70e-01 4.65e-01 4.25e-01 6.77e-01 1.49e+00 1.94e+00 ph/cm2/s
90%_error_low -1.73e-01 -1.53e-01 -1.09e-01 -3.04e-01 -4.02e-01 -4.80e-01 ph/cm2/s
90%_error_hi 2.15e-01 1.52e-01 1.08e-01 4.25e-01 4.12e-01 4.84e-01 ph/cm2/s
Fluence CPL 1.30e-07 1.72e-07 1.63e-07 3.76e-07 5.52e-07 7.03e-07 erg/cm2
90%_error_low -5.06e-08 -4.27e-08 -7.42e-08 -2.79e-07 -1.71e-07 -3.12e-07 erg/cm2
90%_error_hi 4.29e-08 4.27e-08 7.56e-08 1.51e-07 1.67e-07 3.69e-07 erg/cm2
Peak flux CPL 2.81e-01 4.77e-01 4.75e-01 3.42e-01 1.43e+00 1.57e+00 ph/cm2/s
90%_error_low -1.89e-01 -1.73e-01 -1.38e-01 -3.42e-01 -4.03e-01 -4.97e-01 ph/cm2/s
90%_error_hi 2.60e-01 1.72e-01 1.45e-01 4.90e-01 4.22e-01 6.63e-01 ph/cm2/s
======================================================================
Image
Pre-slew 50.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 338.929 -64.890 0.000 50.094 -26.299 0.050 6.297 TRIG_00301578 Image time interval: 0.000 to 0.064 [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 0.012 sec. to 121.132 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.06926 ( -0.545964 0.467642 ) Norm@50keV : 4.94545E-04 ( -0.000166583 0.00015511 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.22 using 59 PHA bins. # Reduced chi-squared = 0.8460 for 57 degrees of freedom # Null hypothesis probability = 7.896269e-01 Photon flux (15-150 keV) in 121.1 sec: 7.66513E-02 ( -0.0191461 0.0191667 ) ph/cm2/s Energy fluence (15-150 keV) : 5.55001e-07 ( -1.62e-07 1.68624e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 121.132 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.98488 ( ) Epeak [keV] : 8.24290 ( ) Norm@50keV : 5.49770E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.22 using 59 PHA bins. # Reduced chi-squared = 0.8611 for 56 degrees of freedom # Null hypothesis probability = 7.606882e-01 Photon flux (15-150 keV) in 121.1 sec: 7.64260E-02 ( -0.0189753 0.0189787 ) ph/cm2/s Energy fluence (15-150 keV) : 5.52095e-07 ( -1.70841e-07 1.67162e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.048 sec. to 0.952 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.12956 ( -0.412389 0.442614 ) Norm@50keV : 1.28185E-02 ( -0.00332728 0.00327267 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.03 using 59 PHA bins. # Reduced chi-squared = 0.9655 for 57 degrees of freedom # Null hypothesis probability = 5.491572e-01 Photon flux (15-150 keV) in 1 sec: 1.49142 ( -0.4019 0.41152 ) ph/cm2/s Energy fluence (15-150 keV) : 1.32798e-07 ( -3.34178e-08 3.34858e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.048 sec. to 0.952 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.21674 ( -4.43622 0.177339 ) Epeak [keV] : 68.7242 ( ) Norm@50keV : 2.70325E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.03 using 59 PHA bins. # Reduced chi-squared = 0.9648 for 56 degrees of freedom # Null hypothesis probability = 5.499083e-01 Photon flux (15-150 keV) in 1 sec: 1.42904 ( -0.40314 0.42205 ) ph/cm2/s Energy fluence (15-150 keV) : 1.29181e-07 ( -3.53687e-08 3.4659e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 114.912 sec. Hardness ratio (energy fluence ratio) = 0.95314754695
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.012223e-07 S(50-150 keV) = 2.5377671e-07
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 = 1.07195403911, IMY = 0.529777073925
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: -70.223410 0.012000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.7597 -62.7182 3.4 43.8 45.1 1.1502 3.4 4.2 GX 301-2 244.9692 -15.6586 0.5 27.9 165.9 2.3056 23.4 1.3 Sco X-1 255.7804 -37.7549 7.1 4.5 -165.6 0.1407 1.6 11.1 4U 1700-377 256.2677 -36.3386 8.2 5.9 -163.4 0.1200 1.4 9.6 GX 349+2 263.0246 -24.8768 89.8 18.5 -149.6 -0.0117 -0.1 7.9 GX 1+4 264.6747 -44.5140 17.1 7.4 -61.2 -0.0596 -0.7 4.8 4U 1735-44 268.4314 -1.4178 3.9 42.5 -152.9 0.4398 2.9 4.3 SW J1753.5-0127 270.2172 -24.9452 3.7 21.3 -132.2 0.3019 3.2 8.8 GX 5-1 270.4628 -25.7154 7.2 20.8 -130.5 0.1552 1.6 8.8 GRS 1758-258 274.0112 -14.0640 2.2 32.5 -137.1 0.5828 5.2 1.7 GX 17+2 276.1191 -30.3887 8.3 20.6 -111.0 0.1331 1.4 10.1 H1820-303 285.1312 -24.8261 5.4 30.2 -108.4 -0.2955 -2.1 7.7 HT1900.1-2455 263.1169 -33.8138 3.1 10.5 -133.2 0.3188 3.7 6.5 GX 354-0 244.2452 -58.9966 2.9 18.1 25.2 0.3349 4.0 ------ UNKNOWN 256.0880 -20.5814 2.3 21.6 -170.3 0.4306 5.1 ------ UNKNOWN 323.0197 -46.6195 3.1 47.2 -53.1 1.5601 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.012000 9.376590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.7543 -62.7331 16.8 43.8 45.1 -0.0793 -0.7 3.5 GX 301-2 244.8608 -15.7447 5.2 27.8 165.7 -0.0804 -2.2 9.3 Sco X-1 256.0639 -37.9568 3.0 4.3 -162.3 0.1161 3.9 7.7 4U 1700-377 256.6114 -36.3587 14.7 5.9 -160.8 0.0239 0.8 9.3 GX 349+2 263.1008 -24.8358 5.1 18.6 -149.4 -0.0683 -2.3 7.4 GX 1+4 264.6428 -44.4548 4.6 7.3 -61.6 0.0723 2.5 4.3 4U 1735-44 268.4834 -1.4191 27.0 42.5 -152.8 0.0224 0.4 7.2 SW J1753.5-0127 270.3733 -25.1636 9.7 21.2 -131.5 0.0424 1.2 7.0 GX 5-1 270.4231 -25.8651 4.6 20.6 -130.3 -0.0897 -2.5 9.8 GRS 1758-258 274.0771 -14.0926 9.0 32.5 -136.9 -0.0564 -1.3 5.3 GX 17+2 276.1271 -30.4152 74.1 20.6 -111.0 -0.0055 -0.2 10.9 H1820-303 285.1818 -24.9031 6.5 30.2 -108.2 0.0851 1.8 8.0 HT1900.1-2455 262.9579 -33.7465 7.5 10.5 -134.0 -0.0473 -1.5 5.5 GX 354-0 275.0188 -30.5705 2.0 19.7 -112.5 0.2069 5.8 ------ UNKNOWN 322.7604 -56.8572 2.2 44.3 -39.4 0.3500 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 90.176600 962.099200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.5492 -62.6268 0.0 50.9 149.3 5.3569 2.3 9.1 GX 301-2 256.0792 -37.7788 5.3 53.4 -149.0 3.5844 2.2 5.9 4U 1700-377 256.5087 -36.5235 11.8 54.3 -147.8 2.1295 1.0 7.0 GX 349+2 264.7302 -44.4586 202.1 44.2 -146.7 0.0517 0.1 0.8 4U 1735-44 237.3231 -58.9547 3.5 43.0 -178.9 2.2373 3.3 ------ UNKNOWN 11.6166 -24.4720 3.1 45.5 -3.1 3.3338 3.8 ------ UNKNOWN 243.5149 -37.4772 4.6 58.7 -159.1 8.2710 2.5 ------ UNKNOWN 341.8193 -14.8863 3.9 50.0 -43.0 7.3667 3.0 ------ UNKNOWN 305.7897 -29.4933 4.7 40.9 -93.2 6.4318 2.5 ------ UNKNOWN