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: Mon Dec 17 16:48:36 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger868984
======================================================================
Trigger: 00868984 Segment: 000
BAT Trigger Time: 562297761.216 [s; MET]
Trigger Stop: 562297769.408 [s; MET]
UTC: 2018-10-27T01:48:59.396380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 225.382612995229 Dec: 30.8911164541395 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.88
Image Trigger?: NO
Rate S/N Ratio: 6.6332495807108 [ if not an image trigger ]
Image S/N Ratio: 7.88
Analysis Position: [ source = BAT ]
RA: 225.382612995229 Dec: 30.8911164541395 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 225.361813448605 Dec: 30.9377412280724 [deg; J2000]
{ 15h 01m 26.8s , +30d 56' 15.9" }
+/- 1.10086378156983 [arcmin] (estimated 90% radius based on SNR)
+/- 0.444035625508325 [arcmin] (formal 1-sigma fit error)
SNR: 26.515448334366
Angular difference between the analysis and refined position is 2.995378 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 81.3039999008179 +/- 12.1059654022228
Measured from: -7.9559999704361
to: 73.3479999303818 [s; relative to TRIGTIME]
T50: 39.9039999246597 +/- 8.00335331431602
Measured from: 17.3280000686646
to: 57.2319999933243 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 47.808000087738
to: 48.808000087738 [s; relative to TRIGTIME]
Total Fluence
Measured from: -18.4519999027252
to: 85.444000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.134164 1.650992 1.272061 0.362323
0.075358 0.073959 0.063518 0.053697 [error]
Peak 0.043863 0.047352 0.046558 0.020170
0.007877 0.007861 0.006902 0.005723 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 103.896 -18.452 85.444
T90 81.304 -7.956 73.348
T50 39.904 17.328 57.232
Peak 1.000 47.808 48.808
====== 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 -1.417 -0.093 0.093 - - - 2.83e-03 -1.41e-04 1.41e-04 41.070 57
CPL -1.322 -0.271 0.326 348.416 -220.606 -348.416 3.14e-03 -4.34e-04 1.25e-03 41.160 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 -1.291 -0.294 0.300 - - - 1.01e-02 -1.49e-03 1.49e-03 44.810 57
CPL -1.313 -0.271 0.329 9999.360 -9999.360 -9999.360 1.02e-02 -1.48e-03 -1.02e-02 44.860 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 3.47e-07 6.71e-07 1.00e-06 3.25e-06 2.83e-06 5.28e-06 erg/cm2
90%_error_low -3.29e-08 -3.76e-08 -6.32e-08 -4.41e-07 -1.54e-07 -4.82e-07 erg/cm2
90%_error_hi 3.40e-08 3.74e-08 6.29e-08 4.88e-07 1.54e-07 5.21e-07 erg/cm2
Peak flux PL 3.42e-01 3.89e-01 3.18e-01 4.35e-01 1.21e+00 1.48e+00 ph/cm2/s
90%_error_low -1.01e-01 -7.07e-02 -5.80e-02 -1.55e-01 -1.86e-01 -2.25e-01 ph/cm2/s
90%_error_hi 1.11e-01 6.77e-02 5.62e-02 2.05e-01 1.86e-01 2.30e-01 ph/cm2/s
Fluence CPL 3.43e-07 6.74e-07 1.01e-06 3.00e-06 2.82e-06 5.03e-06 erg/cm2
90%_error_low -4.05e-08 -3.99e-08 -6.40e-08 -1.18e-06 -1.70e-07 -1.18e-06 erg/cm2
90%_error_hi 3.21e-08 4.20e-08 6.88e-08 3.68e-07 1.63e-07 4.11e-07 erg/cm2
Peak flux CPL 3.42e-01 3.89e-01 3.18e-01 4.32e-01 1.21e+00 1.48e+00 ph/cm2/s
90%_error_low -1.02e-01 -7.36e-02 -5.81e-02 N/A -1.86e-01 -2.38e-01 ph/cm2/s
90%_error_hi 1.10e-01 7.04e-02 5.64e-02 N/A 1.86e-01 2.29e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 225.3618 30.9377 0.0073 23.5262 -12.6833 4.3640722 26.515 TRIG_00868984 Foreground time interval of the image: -18.452 85.444 (delta_t = 103.896 [sec]) Background time interval of the image: -239.216 -18.452 (delta_t = 220.764 [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 -18.452 sec. to 85.444 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.41671 ( -0.0928473 0.0930136 ) Norm@50keV : 2.82671E-03 ( -0.000140767 0.000140676 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.07 using 59 PHA bins. # Reduced chi-squared = 0.7206 for 57 degrees of freedom # Null hypothesis probability = 9.446374e-01 Photon flux (15-150 keV) in 103.9 sec: 0.345575 ( -0.018164 0.018232 ) ph/cm2/s Energy fluence (15-150 keV) : 2.82869e-06 ( -1.53615e-07 1.54328e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -18.452 sec. to 85.444 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.32162 ( -0.230043 0.366617 ) Epeak [keV] : 348.416 ( -499.201 -627.012 ) Norm@50keV : 3.13699E-03 ( -0.000294267 0.00138645 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.16 using 59 PHA bins. # Reduced chi-squared = 0.7351 for 56 degrees of freedom # Null hypothesis probability = 9.311687e-01 Photon flux (15-150 keV) in 103.9 sec: 0.344459 ( -0.019427 0.018243 ) ph/cm2/s Energy fluence (15-150 keV) : 2.81745e-06 ( -1.69644e-07 1.63029e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 47.808 sec. to 48.808 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.29133 ( -0.293871 0.300407 ) Norm@50keV : 1.01376E-02 ( -0.00148715 0.00148581 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.81 using 59 PHA bins. # Reduced chi-squared = 0.7862 for 57 degrees of freedom # Null hypothesis probability = 8.791761e-01 Photon flux (15-150 keV) in 1 sec: 1.20753 ( -0.18578 0.18623 ) ph/cm2/s Energy fluence (15-150 keV) : 1.00404e-07 ( -1.65642e-08 1.6713e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 47.808 sec. to 48.808 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.28893 ( -0.272934 0.327486 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 1.01793E-02 ( -0.00149225 -0.0101793 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.84 using 59 PHA bins. # Reduced chi-squared = 0.8007 for 56 degrees of freedom # Null hypothesis probability = 8.576274e-01 Photon flux (15-150 keV) in 1 sec: 1.20750 ( -0.18596 0.18607 ) ph/cm2/s Energy fluence (15-150 keV) : 9.97861e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 81.304 sec. Hardness ratio (energy fluence ratio) = 1.49826929981
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.0175802e-06 S(50-150 keV) = 1.8111297e-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 = 4.247322076781507E-01, IMY = 9.558767325363765E-02
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: -239.216000 -18.452000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9903 -15.6260 0.6 35.4 -130.4 7.3253 18.2 1.1 Sco X-1 254.4402 35.3539 1.2 16.6 61.9 2.4712 9.3 1.1 Her X-1 262.9984 -24.6039 357.9 46.5 -154.5 -0.0175 -0.0 8.5 GX 1+4 268.2250 -1.4711 7.3 28.8 179.0 -0.4556 -1.6 8.6 SW J1753.5-0127 270.2881 -24.9535 5.7 49.5 -162.5 -1.2600 -2.0 7.5 GX 5-1 270.3840 -25.7594 5.2 50.2 -162.1 1.3250 2.2 4.5 GRS 1758-258 273.9307 -14.1214 5.6 42.2 -174.6 0.9164 2.1 6.7 GX 17+2 275.8050 -30.3847 4.5 56.6 -164.4 -2.9128 -2.6 6.3 H1820-303 284.9903 -24.9928 15.6 57.2 -176.1 0.9721 0.7 5.0 HT1900.1-2455 288.7976 11.0217 3.9 39.9 140.4 1.9086 3.0 4.6 GRS 1915+105 263.0093 -33.8395 4.4 55.3 -150.8 -3.3157 -2.6 1.0 GX 354-0 279.3899 29.3380 2.7 29.8 109.0 1.6912 4.2 ------ UNKNOWN 268.0315 -31.9500 2.3 55.0 -156.4 4.8308 5.1 ------ UNKNOWN 232.6659 -7.6573 2.6 31.3 -105.0 1.6832 4.4 ------ UNKNOWN 236.1789 -23.8718 2.5 45.1 -120.2 5.3481 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -18.452000 85.444000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.1524 -15.5989 3.7 35.4 -130.7 -0.7751 -3.1 10.3 Sco X-1 254.5109 35.5158 5.3 16.8 61.9 -0.3885 -2.2 10.7 Her X-1 263.2450 -24.7609 0.0 46.7 -154.7 -0.4122 -1.1 12.9 GX 1+4 268.3149 -1.5923 6.7 28.9 179.0 0.3166 1.7 9.0 SW J1753.5-0127 270.2977 -25.0028 6.8 49.5 -162.4 0.6475 1.7 4.6 GX 5-1 270.4684 -25.7245 5.8 50.2 -162.2 -0.7976 -2.0 9.0 GRS 1758-258 273.9703 -13.9639 5.0 42.1 -174.8 -0.6215 -2.3 4.8 GX 17+2 275.9271 -30.2949 7.2 56.6 -164.6 -1.3010 -1.6 4.3 H1820-303 284.8856 -24.8872 20.8 57.0 -176.1 0.4985 0.6 8.4 HT1900.1-2455 288.8930 11.0539 3.9 40.0 140.3 -1.2040 -3.0 8.6 GRS 1915+105 262.9548 -33.8468 3.6 55.3 -150.7 2.6162 3.2 1.9 GX 354-0 252.5921 54.4476 3.1 35.0 48.5 1.1654 3.7 ------ UNKNOWN 225.3618 30.9377 0.4 23.5 -12.7 4.3637 26.5 ------ UNKNOWN 235.7565 6.7186 2.2 17.7 -91.0 0.8836 5.2 ------ UNKNOWN 216.2520 18.9412 2.1 30.2 -41.8 1.0964 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: -239.216000 962.834000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9827 -15.6279 0.5 35.4 -130.4 40.0464 24.8 0.8 Sco X-1 254.4400 35.3515 1.0 16.6 61.9 12.9062 12.0 1.0 Her X-1 262.9799 -24.5864 0.0 46.5 -154.5 2.0308 0.9 9.7 GX 1+4 268.2070 -1.4644 5.4 28.8 179.0 -2.5059 -2.1 9.7 SW J1753.5-0127 270.2593 -25.1505 6.8 49.6 -162.3 4.1862 1.7 4.5 GX 5-1 270.3384 -25.7525 4.8 50.2 -162.0 5.9893 2.4 2.0 GRS 1758-258 273.9609 -14.1511 4.4 42.2 -174.6 4.4236 2.6 7.4 GX 17+2 275.8394 -30.3595 4.7 56.6 -164.5 -9.9995 -2.4 4.5 H1820-303 284.8458 -24.8794 0.0 57.0 -176.0 6.0598 1.3 10.6 HT1900.1-2455 288.7452 10.9955 4.6 39.9 140.5 7.1093 2.5 4.3 GRS 1915+105 262.8269 -33.8475 6.5 55.3 -150.6 8.9945 1.8 8.1 GX 354-0 242.7614 59.8241 3.9 40.4 39.8 6.4083 2.9 ------ UNKNOWN 222.1005 59.3116 3.4 43.9 25.2 6.1140 3.4 ------ UNKNOWN 216.2291 44.9188 3.6 36.6 5.1 4.4381 3.2 ------ UNKNOWN 191.3119 45.8103 3.5 53.2 -2.8 7.5696 3.3 ------ UNKNOWN 232.6645 -7.7108 2.7 31.4 -105.1 6.7702 4.3 ------ UNKNOWN