J/PAZh/36/744 SPI-ACS/INTEGRAL short gamma-ray bursts (Minaev+, 2010)
Extended emission from short gamma-ray bursts detected with SPI-ACS/INTEGRAL.
Minaev P.Yu., Pozanenko A.S., Loznikov V.M.
<Pis'ma Astron. Zh. 36, 744 (2010)>
=2010PAZh...36..744M 2010PAZh...36..744M
=2010AstL...36..707M 2010AstL...36..707M
ADC_Keywords: Gamma rays
Keywords: short gamma-ray bursts - extended emission - afterglow
Abstract:
The short duration (T90<2s) gamma-ray bursts (GRBs) detected in the
SPI-ACS experiment onboard the INTEGRAL observatory are investigated.
Averaged light curves have been constructed for various groups of
events, including short GRBs and unidentified short events. Extended
emission has been found in the averaged light curves of both short
GRBs and unidentified short events. It is shown that the fraction of
the short GRBs in the total number of SPI-ACS GRBs can range from 30
to 45%, which is considerably larger than has been thought previously.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 101 83 *Catalog of confirmed short GRBs detected with
SPI-ACS/INTEGRAL
refs.dat 96 17 References
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Note on table2.dat: In the standard analysis performed in our paper, we
found no statistically significant extended emission in the SPI-ACS
energy range. A joint analysis of the duration and hardness of this
burst in the RHESSI experiment (Ripa et al., 2009, Cat. J/A+A/498/399)
allows it to be classified as a short/hard burst with the possible
presence of extended emission.
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See also:
J/A+A/438/1175 : First INTEGRAL SPI-ACS Gamma-Ray Burst Catalogue (Rau+, 2005)
J/A+A/498/399 : GRB observed with RHESSI satellite (Ripa+, 2009)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- GRB GRB name
8- 15 A8 "h:m:s" Trigg Trigger time, UT
17- 20 F4.2 s T90 ?=- Duration
22- 25 F4.2 s e_T90 ?=- rms uncertainty on T90
26- 27 A2 --- n_T90 [* ] Origin of T90 (1)
28- 31 F4.1 20ct/ms Cmax ?=- Maximum count rate (in 103counts/50ms)
33- 35 F3.1 20ct/ms e_Cmax ?=- rms uncertainty on Cmax
37- 53 A17 --- Conf Confirmation (2)
55- 58 F4.2 s T90B ? Duration determined in other experiment
60 A1 --- --- "["
61- 62 I2 --- r_T90B ? Reference for T90B
63 A1 --- --- "]"
65- 68 F4.2 s T90C ? Duration determined in other experiment
70 A1 --- --- "["
71- 72 I2 --- r_T90C ? Reference for T90C
73 A1 --- --- "]"
75- 79 F5.1 s T90D ? Duration determined in other experiment
81 A1 --- --- "["
82- 83 I2 --- r_T90D ? Reference for T90D
84 A1 --- --- "]"
85 A1 --- n_T90D [*] Note for GRB 061006 (3)
88 A1 --- Flag [+] + when used in the averaged light curve
90- 97 A8 --- Rem Remarks (4)
99-101 I3 s T90f ? The final (or initial) time in the available
light curve (relative to T0) used for
averaging
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Note (1): Note as follows:
* = The values were obtained from public IBAS data, i.e., in the
time interval [-5; 100]s relative to the trigger time.
** = Ryde et al. (2003A&A...411L.331R 2003A&A...411L.331R) gives a duration of 13s for
this burst. In other sources, the burst duration is
0.9s (Rau et al., 2005, Cat. J/A+A/438/1175) and
1.3s (Ripa et al., 2009, Cat. J/A+A/498/399).
Note (2): The observatories that also detected this event are as follows:
u = Ulysses
h = HETE-2
k = Konus
s = Swift
s7 = Swift. This event was observed outside the BAT/Swift field of view
mes = Messenger
sz = Suzaku
r = RHESSI
m = Mars-observer
Note (3): The duration of this event is 120s in the range 15-100keV and
0.58s at >100keV (Lin et al. 2008, 0809.1786), the burst
consists of a short hard peak and a period of activity in the soft
energy range. This burst was initially classified as a short/hard one
(Krimm et al., 2006GCN..5704....1K 2006GCN..5704....1K). In our standard analysis, we
found no extended emission from GRB 061006 in the SPI-ACS energy range
and also classify it as a short burst.
Note (4): Remarks:
bad bgd = The light curve was excluded from the averaged light curve
due to an unsatisfactory background fitting quality
ext. em = A short GRB with detected extended emission
sl. = The data for the corresponding event are inaccessible due
to the observatory's slew
n/d = The original data for the corresponding event are inaccessible
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 41 A18 --- Aut Author's name
43- 96 A54 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Oct-2010