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.
Special note: Due to the low partial coding fraction, the refined position is found using the DETECTION mask. Therefore, the refined position and the mask shadow pattern shown here are from analyses with DETECTION mask, everything else uses the FLUX mask.
==========================================================================
BAT GROUND-DETECTED GRB DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Sun May 10 00:10:16 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================
Trigger: 00635929 Segment: 000
BAT Trigger Time: 448795729.6
UTC: 2015-03-23T09:28:36.253 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst is the T100 start time.
Analysis Position: [ source = GCN ]
RA: 260.447 Dec: 38.316 [deg; J2000]
Refined Position: [ source = BAT pre-slew image ]
RA: 260.468317879 Dec: 38.2977288931 [deg; J2000]
{ 17h 21m 52.4s , +38d 17' 51.8" }
+/- 3.87291730079 [arcmin] (estimated 90% radius based on SNR)
SNR: 4.39663682045
Angular difference between the analysis and refined position is 1.486336 arcmin
Partial Coding Fraction: 0.08984375 [ including projection effects ]
Duration
T90: 59.1999999880791 +/- 1.6
Measured from: 3.2
to: 62.4 [s; relative to TRIGTIME]
T50: 33.6000000238419 +/- 1.6
Measured from: 17.6
to: 51.2 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 65.600 0.000 65.600
T90 59.200 3.200 62.400
T50 33.600 17.600 51.200
Peak 1.000 57.900 58.900
====== 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 -1.521 -0.098 0.098 - - - 3.17e-02 -1.77e-03 1.76e-03 47.840 57
CPL -1.454 -0.159 0.353 397.397 -397.397 -397.397 3.41e-02 -4.05e-03 1.54e-02 47.900 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 N/A N/A N/A - - - N/A N/A N/A N/A N/A
CPL N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
=== 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 4.18e-07 7.57e-07 1.06e-06 3.07e-06 3.03e-06 5.30e-06 erg/cm2
90%_error_low -4.13e-08 -4.58e-08 -7.42e-08 -4.47e-07 -1.80e-07 -5.03e-07 erg/cm2
90%_error_hi 4.26e-08 4.55e-08 7.38e-08 4.94e-07 1.81e-07 5.39e-07 erg/cm2
Peak flux PL N/A N/A N/A N/A N/A N/A ph/cm2/s
Image
15.0-350.0 keV image (Event data; DETECTION mask)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 260.444 38.316 0.008 39.690 -98.062 3.878 24.285 TRIG_00635929 Image time interval: 1.400 to 10.701 [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.
Best duration plot
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 1.400 sec. to 11.507 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52137 ( -0.0982996 0.0977094 ) Norm@50keV : 3.17057E-02 ( -0.0017671 0.00176364 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.84 using 59 PHA bins. # Reduced chi-squared = 0.8393 for 57 degrees of freedom # Null hypothesis probability = 8.009587e-01 Photon flux (15-150 keV) in 10.11 sec: 3.98140 ( -0.23255 0.23327 ) ph/cm2/s Energy fluence (15-150 keV) : 3.0309e-06 ( -1.80397e-07 1.80996e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.400 sec. to 11.507 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.4542 ( -0.129044 0.383237 ) Epeak [keV] : 397.397 ( -767.502 -767.502 ) Norm@50keV : 3.41450E-02 ( -0.00286631 0.016532 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.90 using 59 PHA bins. # Reduced chi-squared = 0.8553 for 56 degrees of freedom # Null hypothesis probability = 7.709480e-01 Photon flux (15-150 keV) in 10.11 sec: 3.97475 ( -0.24185 0.23037 ) ph/cm2/s Energy fluence (15-150 keV) : 3.02567e-06 ( -1.88855e-07 1.795e-07 ) ergs/cm2
1-s peak spectrum fit
1-s peak spectrum unavailable, likely because there are no event data in the 1-s peak range.
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 59.2 sec. Hardness ratio (energy fluence ratio) = 1.39347823992
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.1749663e-06 S(50-150 keV) = 1.8559594e-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 = -0.11639144654, IMY = 0.82173230137
Spacecraft aspect plot
Bright source in the event data image
Event data image of 15-350 keV band
Time interval of the image: 4.668000 10.452000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9895 -15.6806 3.8 48.2 -13.7 0.2944 3.1 2.5 Sco X-1 254.6136 35.4746 5.6 34.6 -94.6 -0.2105 -2.1 11.0 Her X-1 226.9747 -16.3713 2.4 41.4 9.0 0.3740 4.8 ------ UNKNOWN 232.0152 37.6249 2.8 19.0 -116.3 0.2116 4.2 ------ UNKNOWN 263.0279 8.3439 2.3 46.8 -54.7 1.1205 4.9 ------ UNKNOWN
Webpage updated on: Mon Jun 8 01:23:38 EDT 2015