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: Tue May 5 17:33:51 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger637044
======================================================================
Trigger: 00637044 Segment: 000
BAT Trigger Time: 449790870.208 [s; MET]
Trigger Stop: 449790871.232 [s; MET]
UTC: 2015-04-03T21:54:16.809780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 311.504549158767 Dec: -62.7015671965277 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.08
Image Trigger?: NO
Rate S/N Ratio: 77.9037868142493 [ if not an image trigger ]
Image S/N Ratio: 21.08
Analysis Position: [ source = BAT ]
RA: 311.504549158767 Dec: -62.7015671965277 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 311.504839868003 Dec: -62.7061118444366 [deg; J2000]
{ 20h 46m 01.2s , -62d 42' 22.0" }
+/- 0.706963406713824 [arcmin] (estimated 90% radius based on SNR)
+/- 0.183330360496723 [arcmin] (formal 1-sigma fit error)
SNR: 49.9189700292313
Angular difference between the analysis and refined position is 0.272796 arcmin
Partial Coding Fraction: 0.4023438 [ including projection effects ]
Duration
T90: 37.2959999442101 +/- 11.7165546057665
Measured from: -7.66000002622604
to: 29.635999917984 [s; relative to TRIGTIME]
T50: 8.90399992465973 +/- 0.515875925006412
Measured from: 2.29199999570847
to: 11.1959999203682 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.80400002002716
to: 6.80400002002716 [s; relative to TRIGTIME]
Total Fluence
Measured from: -83.1480000019073
to: 145.371999979019 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.153050 8.338450 8.142996 2.624169
0.133262 0.136869 0.123169 0.102599 [error]
Peak 0.348283 0.707570 0.844538 0.317785
0.017468 0.022496 0.024431 0.019397 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 228.520 -83.148 145.372
T90 37.296 -7.660 29.636
T50 8.904 2.292 11.196
Peak 1.000 5.804 6.804
====== 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 -1.221 -0.038 0.038 - - - 7.40e-03 -1.52e-04 1.51e-04 39.870 57
CPL -1.097 -0.137 0.154 444.655 -232.028 -444.655 8.32e-03 -7.06e-04 1.27e-03 37.880 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 -0.918 -0.060 0.060 - - - 1.53e-01 -5.22e-03 5.21e-03 50.960 57
CPL -0.746 -0.196 0.237 432.987 -432.987 -432.987 1.82e-01 -3.06e-02 4.69e-02 49.280 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 1.66e-06 3.63e-06 6.22e-06 2.47e-05 1.71e-05 3.62e-05 erg/cm2
90%_error_low -7.49e-08 -9.60e-08 -1.34e-07 -1.26e-06 -3.45e-07 -1.30e-06 erg/cm2
90%_error_hi 7.64e-08 9.58e-08 1.34e-07 1.31e-06 3.45e-07 1.34e-06 erg/cm2
Peak flux PL 1.38e-03 1.68e-02 2.16e-01 1.88e+01 9.80e-01 1.87e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 1.60e-06 3.64e-06 6.31e-06 2.13e-05 1.70e-05 3.28e-05 erg/cm2
90%_error_low -1.03e-07 -9.78e-08 -1.62e-07 -3.41e-06 -3.64e-07 -3.39e-06 erg/cm2
90%_error_hi 1.00e-07 9.80e-08 1.67e-07 3.66e-06 3.63e-07 3.03e-06 erg/cm2
Peak flux CPL 3.45e+00 5.20e+00 5.59e+00 9.00e+00 1.75e+01 2.32e+01 ph/cm2/s
90%_error_low -3.31e-01 -2.32e-01 -2.45e-01 -1.82e+00 -6.20e-01 -1.92e+00 ph/cm2/s
90%_error_hi 3.09e-01 2.33e-01 2.52e-01 1.98e+00 6.20e-01 2.14e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 311.5048 -62.7061 0.0039 33.0113 -65.3898 17.6987770 49.919 TRIG_00637044 Foreground time interval of the image: -83.148 11.093 (delta_t = 94.241 [sec]) Background time interval of the image: -239.208 -83.148 (delta_t = 156.060 [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 -83.148 sec. to 145.372 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.22092 ( -0.0378419 0.0380099 ) Norm@50keV : 7.39697E-03 ( -0.000151855 0.000151481 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.87 using 59 PHA bins. # Reduced chi-squared = 0.6994 for 57 degrees of freedom # Null hypothesis probability = 9.588245e-01 Photon flux (15-150 keV) in 228.5 sec: 0.870900 ( -0.019772 0.019835 ) ph/cm2/s Energy fluence (15-150 keV) : 1.70501e-05 ( -3.45088e-07 3.45396e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -83.148 sec. to 145.372 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.097 ( -0.136496 0.154272 ) Epeak [keV] : 444.655 ( -232.238 -444.864 ) Norm@50keV : 8.32018E-03 ( -0.000705883 0.00127367 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.88 using 59 PHA bins. # Reduced chi-squared = 0.6764 for 56 degrees of freedom # Null hypothesis probability = 9.697680e-01 Photon flux (15-150 keV) in 228.5 sec: 0.862829 ( -0.021823 0.021903 ) ph/cm2/s Energy fluence (15-150 keV) : 1.69561e-05 ( -3.64213e-07 3.63018e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.804 sec. to 6.804 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.917571 ( -0.0596312 0.0600957 ) Norm@50keV : 0.153214 ( -0.00521846 0.0052054 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.96 using 59 PHA bins. # Reduced chi-squared = 0.8940 for 57 degrees of freedom # Null hypothesis probability = 6.999014e-01 Photon flux (15-150 keV) in 1 sec: 0.980019 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.70805e-06 ( -6.27693e-08 6.29151e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.804 sec. to 6.804 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.745714 ( -0.196107 0.237456 ) Epeak [keV] : 432.987 ( -432.987 -432.987 ) Norm@50keV : 0.181846 ( -0.0305712 0.0468526 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.28 using 59 PHA bins. # Reduced chi-squared = 0.8799 for 56 degrees of freedom # Null hypothesis probability = 7.254437e-01 Photon flux (15-150 keV) in 1 sec: 17.4739 ( -0.6195 0.6196 ) ph/cm2/s Energy fluence (15-150 keV) : 1.69664e-06 ( -6.52042e-08 6.49709e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 37.296 sec. Hardness ratio (energy fluence ratio) = 1.71604956998
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.288536e-06 S(50-150 keV) = 1.1761674e-05
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 = 2.705571048557010E-01, IMY = 5.906714449798098E-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: -239.208000 -83.148000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3996 -60.6554 5.6 47.0 20.6 0.9953 2.1 3.1 Cen X-3 186.5879 -62.8636 4.3 39.1 21.3 0.7570 2.7 5.9 GX 301-2 244.9782 -15.6461 0.8 34.3 140.1 4.9242 15.0 0.4 Sco X-1 255.9541 -37.9895 24.3 10.8 159.6 0.0859 0.5 8.9 4U 1700-377 256.3474 -36.4980 3.3 12.3 161.0 0.6212 3.4 6.2 GX 349+2 263.1836 -24.6406 6.5 24.9 175.0 0.3402 1.8 11.4 GX 1+4 264.9148 -44.5724 4.0 7.6 -141.8 0.4762 2.9 10.4 4U 1735-44 268.3792 -1.3330 4.2 48.7 175.6 -1.2346 -2.8 7.2 SW J1753.5-0127 270.1912 -25.0770 4.0 26.3 -170.6 0.5350 2.9 5.1 GX 5-1 270.2884 -25.7419 3.8 25.7 -169.9 0.5678 3.1 0.8 GRS 1758-258 273.9017 -13.9146 11.5 38.0 -171.8 0.2629 1.0 9.5 GX 17+2 275.7466 -30.4894 0.0 23.8 -154.3 -0.4024 -2.1 11.8 H1820-303 284.9746 -24.9085 5.9 33.0 -147.0 0.4642 1.9 3.4 HT1900.1-2455 262.9313 -33.7763 2.4 15.9 -179.1 0.8254 4.9 4.5 GX 354-0 242.0143 -53.0602 2.4 9.6 37.2 0.8502 4.9 ------ UNKNOWN 261.6004 -30.8841 3.2 18.5 174.8 0.6150 3.7 ------ UNKNOWN 290.7647 0.1900 3.3 57.5 -158.4 3.6044 3.5 ------ UNKNOWN 348.6722 -67.1625 3.0 47.1 -53.2 3.9670 3.8 ------ UNKNOWN 303.1512 -15.8521 2.8 50.6 -134.9 4.1459 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -83.148000 11.092590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.0719 -60.6711 6.1 47.1 20.5 -0.8542 -1.9 7.7 Cen X-3 186.3559 -62.8891 4.7 39.2 21.2 -0.7449 -2.4 10.9 GX 301-2 244.9798 -15.6397 32.8 34.3 140.1 0.1055 0.4 0.0 Sco X-1 255.8440 -37.8768 58.1 10.9 159.1 0.0420 0.2 7.0 4U 1700-377 256.6333 -36.4185 14.4 12.4 162.0 0.1665 0.8 9.6 GX 349+2 262.8532 -24.7407 13.2 24.7 174.3 0.1901 0.9 8.5 GX 1+4 264.8289 -44.3117 8.6 7.7 -143.6 0.2501 1.3 9.1 4U 1735-44 268.4045 -1.3837 5.1 48.6 175.7 1.1036 2.3 4.7 SW J1753.5-0127 270.2098 -24.9096 19.2 26.4 -170.7 -0.1305 -0.6 11.0 GX 5-1 270.2630 -25.6504 5.1 25.8 -170.0 -0.4877 -2.2 6.0 GRS 1758-258 274.1499 -13.9153 0.0 38.0 -171.5 -0.3732 -1.3 11.1 GX 17+2 276.0245 -30.5144 8.5 23.9 -153.8 -0.2590 -1.4 10.2 H1820-303 285.1431 -25.0777 4.7 33.0 -146.6 -0.6082 -2.4 11.1 HT1900.1-2455 262.9814 -33.8425 532.2 15.9 -178.8 0.0041 0.0 0.6 GX 354-0 190.5119 -42.7335 3.0 44.5 50.8 3.2617 3.9 ------ UNKNOWN 224.9827 -23.3560 3.6 35.1 104.0 1.3967 3.3 ------ UNKNOWN 142.8708 -69.9080 3.6 51.8 2.5 1.8176 3.2 ------ UNKNOWN 138.1823 -76.8596 2.9 48.4 -5.7 1.4576 4.0 ------ UNKNOWN 311.5048 -62.7061 0.2 33.0 -65.4 17.6984 49.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 64.092590 962.891600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9899 -37.8516 15.0 41.4 128.6 -1.7222 -0.8 0.5 4U 1700-377 256.2194 -36.4801 11.8 42.4 130.0 -2.4056 -1.0 11.0 GX 349+2 262.9920 -24.7409 47.1 49.6 145.2 -0.8920 -0.2 1.0 GX 1+4 264.7440 -44.4151 10.1 32.2 130.8 1.1370 1.1 2.1 4U 1735-44 270.2022 -24.9438 11.8 46.6 153.0 2.4036 1.0 9.3 GX 5-1 270.1770 -25.7186 6.1 45.9 152.6 4.3146 1.9 6.9 GRS 1758-258 275.8331 -30.4468 9.6 39.5 156.3 -1.5558 -1.2 6.8 H1820-303 285.0928 -24.8649 8.4 41.7 171.2 1.4137 1.4 4.5 HT1900.1-2455 262.9054 -33.8460 28.0 41.7 139.0 0.8053 0.4 4.2 GX 354-0 291.0097 -47.4928 3.1 19.0 162.0 2.1507 3.8 ------ UNKNOWN 311.3659 -62.6182 2.2 0.1 -178.0 3.0625 5.4 ------ UNKNOWN 67.3895 -58.0547 2.4 49.6 -10.2 6.0657 4.7 ------ UNKNOWN 317.5293 -8.4681 4.2 54.4 -144.2 13.3173 2.7 ------ UNKNOWN 34.7504 -41.7735 4.2 50.8 -44.5 11.5840 2.8 ------ UNKNOWN 14.1698 -38.9699 3.7 43.7 -63.9 11.7641 3.1 ------ UNKNOWN 324.6175 -12.9651 2.3 50.6 -134.9 20.0308 5.1 ------ UNKNOWN