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: Sun May 17 01:28:49 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger638808
======================================================================
Trigger: 00638808 Segment: 000
BAT Trigger Time: 451463298.176 [s; MET]
Trigger Stop: 451463298.432 [s; MET]
UTC: 2015-04-23T06:28:04.692100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 221.600452494162 Dec: 12.2883046095778 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.41
Image Trigger?: NO
Rate S/N Ratio: 41.2431812546026 [ if not an image trigger ]
Image S/N Ratio: 10.41
Analysis Position: [ source = BAT ]
RA: 221.600452494162 Dec: 12.2883046095778 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 221.602601237827 Dec: 12.2659338160383 [deg; J2000]
{ 14h 46m 24.6s , +12d 15' 57.4" }
+/- 1.85998191532332 [arcmin] (estimated 90% radius based on SNR)
+/- 0.839234691015015 [arcmin] (formal 1-sigma fit error)
SNR: 12.5344684228975
Angular difference between the analysis and refined position is 1.348146 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 0.215999901294708 +/- 0.0282842442734789
Measured from: 0.0120000243186951
to: 0.227999925613403 [s; relative to TRIGTIME]
T50: 0.119999945163727 +/- 0.030463099373373
Measured from: 0.0720000267028809
to: 0.191999971866608 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.374000012874603
to: 0.625999987125397 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00800001621246338
to: 0.240000009536743 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.010714 0.028953 0.039330 0.015862
0.003343 0.004139 0.004354 0.003601 [error]
Peak 0.015535 0.036092 0.048956 0.010570
0.006051 0.006598 0.005996 0.005220 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.232 0.008 0.240
T90 0.216 0.012 0.228
T50 0.120 0.072 0.192
Peak 1.000 -0.374 0.626
====== 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 -0.771 -0.230 0.238 - - - 2.39e-02 -3.46e-03 3.44e-03 78.220 57
CPL 0.443 -1.050 1.404 120.501 -35.205 319.508 7.84e-02 -4.96e-02 1.96e-01 74.200 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 -0.858 -0.278 0.295 - - - 7.50e-03 -1.25e-03 1.24e-03 58.660 57
CPL 0.011 -0.990 1.796 134.953 N/A N/A 1.78e-02 N/A N/A 57.330 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 3.60e-09 1.04e-08 2.43e-08 1.55e-07 6.57e-08 1.94e-07 erg/cm2
90%_error_low -9.60e-10 -1.80e-09 -3.77e-09 -4.73e-08 -1.03e-08 -5.00e-08 erg/cm2
90%_error_hi 1.05e-09 1.77e-09 3.73e-09 6.00e-08 1.04e-08 6.14e-08 erg/cm2
Peak flux PL 1.67e-01 2.48e-01 2.73e-01 5.68e-01 8.61e-01 1.26e+00 ph/cm2/s
90%_error_low -5.47e-02 -5.32e-02 -4.63e-02 -1.85e-01 -1.42e-01 -2.24e-01 ph/cm2/s
90%_error_hi 6.22e-02 5.22e-02 4.59e-02 2.41e-01 1.42e-01 2.43e-01 ph/cm2/s
Fluence CPL 2.58e-09 1.10e-08 2.78e-08 4.62e-08 6.31e-08 8.76e-08 erg/cm2
90%_error_low -1.18e-09 -2.13e-09 -4.86e-09 -2.68e-08 -1.10e-08 -2.82e-08 erg/cm2
90%_error_hi 1.33e-09 2.13e-09 5.07e-09 8.17e-08 1.10e-08 7.99e-08 erg/cm2
Peak flux CPL 1.31e-01 2.55e-01 2.99e-01 2.66e-01 8.29e-01 9.52e-01 ph/cm2/s
90%_error_low -6.96e-02 -5.89e-02 -5.97e-02 -1.68e-01 -1.52e-01 -2.39e-01 ph/cm2/s
90%_error_hi 8.01e-02 5.98e-02 6.20e-02 3.75e-01 1.50e-01 2.97e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 221.6026 12.2659 0.0153 12.3481 57.6330 0.0982011 12.534 TRIG_00638808 Foreground time interval of the image: 0.008 0.240 (delta_t = 0.232 [sec]) Background time interval of the image: -719.875 -701.655 (delta_t = 18.221 [sec]) -239.176 0.008 (delta_t = 239.184 [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 0.008 sec. to 0.240 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.771052 ( -0.229765 0.23805 ) Norm@50keV : 2.39279E-02 ( -0.00345842 0.00343979 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 78.22 using 59 PHA bins. # Reduced chi-squared = 1.372 for 57 degrees of freedom # Null hypothesis probability = 3.254926e-02 Photon flux (15-150 keV) in 0.232 sec: 2.75337 ( -0.39138 0.39166 ) ph/cm2/s Energy fluence (15-150 keV) : 6.56808e-08 ( -1.02862e-08 1.03707e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 0.240 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.443048 ( -1.04979 1.40415 ) Epeak [keV] : 120.501 ( -35.22 319.493 ) Norm@50keV : 7.83706E-02 ( -0.0495546 0.195899 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.20 using 59 PHA bins. # Reduced chi-squared = 1.325 for 56 degrees of freedom # Null hypothesis probability = 5.217618e-02 Photon flux (15-150 keV) in 0.232 sec: 2.66396 ( -0.40308 0.40141 ) ph/cm2/s Energy fluence (15-150 keV) : 6.30534e-08 ( -1.0975e-08 1.0951e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.374 sec. to 0.626 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.857667 ( -0.277593 0.295485 ) Norm@50keV : 7.50190E-03 ( -0.00125115 0.00123674 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.66 using 59 PHA bins. # Reduced chi-squared = 1.029 for 57 degrees of freedom # Null hypothesis probability = 4.145131e-01 Photon flux (15-150 keV) in 1 sec: 0.861072 ( -0.141597 0.142188 ) ph/cm2/s Energy fluence (15-150 keV) : 8.56209e-08 ( -1.47937e-08 1.49309e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.374 sec. to 0.626 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.0108688 ( -0.989659 1.79621 ) Epeak [keV] : 134.953 ( ) Norm@50keV : 1.78272E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.33 using 59 PHA bins. # Reduced chi-squared = 1.024 for 56 degrees of freedom # Null hypothesis probability = 4.256099e-01 Photon flux (15-150 keV) in 1 sec: 0.828978 ( -0.152159 0.150418 ) ph/cm2/s Energy fluence (15-150 keV) : 8.16676e-08 ( -1.66247e-08 1.62588e-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 = 1.171942592691804E-01, IMY = -1.849037376510331E-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: -719.875400 -701.654600 -239.176000 0.008000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9889 -15.6436 0.7 48.1 42.4 21.2257 17.6 0.6 Sco X-1 254.4563 35.3531 2.1 34.5 -38.3 1.5503 5.6 0.6 Her X-1 268.3655 -1.3632 20.6 56.0 9.2 0.8411 0.6 5.4 SW J1753.5-0127 212.6308 -15.9443 2.3 39.9 86.4 4.5923 4.9 ------ UNKNOWN 261.5879 6.4322 3.6 46.3 4.6 1.3338 3.2 ------ UNKNOWN 182.2648 62.7978 3.5 45.3 -121.3 3.6050 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.008000 0.240000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0795 -15.7452 7.8 48.2 42.4 0.0552 1.5 8.5 Sco X-1 254.5050 35.3192 6.4 34.5 -38.3 0.0169 1.8 2.7 Her X-1 268.3034 -1.5242 7.9 56.0 9.4 -0.0622 -1.5 5.8 SW J1753.5-0127 221.6026 12.2660 0.9 12.3 57.6 0.0982 12.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 53.324600 962.894000 1175.824000 1175.824610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9825 -15.6355 0.2 36.3 25.8 85.4166 59.5 0.3 Sco X-1 254.5056 35.2717 3.9 37.6 -67.4 6.8742 3.0 4.9 Her X-1 263.0989 -24.6605 5.2 54.8 18.5 10.5397 2.2 7.1 GX 1+4 268.3883 -1.4587 8.4 48.4 -10.8 2.4435 1.4 1.3 SW J1753.5-0127 176.2982 -2.2629 3.0 47.3 141.2 16.0521 3.9 ------ UNKNOWN 211.6359 3.1281 3.9 13.5 113.9 2.6546 2.9 ------ UNKNOWN 266.3160 -13.9879 2.7 51.5 5.3 10.0851 4.2 ------ UNKNOWN 247.4510 -3.7503 3.5 30.3 6.4 3.5632 3.2 ------ UNKNOWN 182.9670 44.2612 3.6 46.0 -152.5 5.5477 3.2 ------ UNKNOWN 180.5611 54.7816 3.1 53.2 -142.2 19.4796 3.7 ------ UNKNOWN 218.8524 56.1614 4.5 43.9 -116.2 10.5316 2.6 ------ UNKNOWN