| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
17:43:37.400 UTC |
GCN_circulars,INTEGRAL |
| ra |
9.5208° |
IPN |
| decl |
-25.7167° |
IPN |
| pos_error |
4.67e-02° |
IPN |
| GBM_located |
False |
|
| mjd |
55380.738627314815 |
GCN_circulars,INTEGRAL |
| IPN table |
|---|
| GRB_name |
GRB100703A |
| ra |
9.5208° |
| decl |
-25.7167° |
| pos_error |
4.67e-02° |
| GCN 10936 table |
|---|
| GRB_name |
GRB100703A |
| GCN_number |
10936 |
| Detection_method |
INTEGRAL |
| t_trigger |
17:43:37.400 UTC |
| ra |
9.5220° |
| decl |
-25.7100° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 10936
SUBJECT: GRB 100703A: a short GRB detected by INTEGRAL
DATE: 10/07/05 13:29:12 GMT
FROM: Sandro Mereghetti at IASF/CNR
S.Mereghetti, A.Paizis (IASF- Milano), D.Gotz (CEA-Saclay), E. Bozzo,
I.Vovk, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf
of the IBAS Localization Team report:
a short gamma ray burst triggered the IBAS detection programs of the
IBIS/ISGRI data at 17:43:37.4 UT on July 3rd.
The trigger significance was below the threshold for automatic alert
distribution. Off-line interactive analysis confirmed that the trigger is
most likely due to a short GRB, consisting of a single peak with a
duration of about 70 ms. Its refined coordinates (J2000) are:
RA: 9.522 [deg]
DEC: -25.710 [deg]
with an uncertainty of 2.8 arcmin (90% c.l.).
A preliminary analysis gives a fluence in the 20-200 keV range of about
7 10e-7 erg/cmsq (70 ms integration time).
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
This message can be cited.
|
| GCN 11766 table |
|---|
| GRB_name |
GRB100703A |
| GCN_number |
11766 |
| Detection_method |
IBAS |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 11766
SUBJECT: IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
DATE: 11/02/24 16:18:42 GMT
FROM: Sandro Mereghetti at IASF/CNR
S.Mereghetti (INAF IASF-Milano), D.Gotz (CEA-Saclay), J. Borkowski (CAMK,
Torun), M. Beck, C.Ferrigno (ISDC, Versoix), on behalf of the IBAS
Localization Team announce:
A new version of the IBAS Alert Distribution system is operational at the
INTEGRAL Science Data Center. In addition to the already available
functionalities, the new version distributes in real time also Alert
Packets for low significance triggers discovered in the field of view of
the IBIS imager.
The new Alert Packets are called WEAK Alerts and are identified by the
field PKT_TYPE=6 (see http://www.isdc.unige.ch/integral/science/grb#IBAS
for details on the different Alert types).
Users interested to receive the Alert Packets of the new type "WEAK"
should contact the ISDC IBAS team (isdc-ibas@unige.ch).
The threshold for the distribution of the usual high significance IBAS
triggers remains unchanged at
SIGMA= 8.0 (Alert Packets with PKT_TYPE= 3 (WAKEUP))
while the threshold for the distribution of low significance IBAS triggers is
currently set at
SIGMA= 6.5 (Alert Packets with PKT_TYPE= 6 (WEAK))
This threshold corresponds to a rate of a few WEAK Alert Packets per week,
but it could be adjusted in the future.
Many WEAK alerts will be produced by statistical fluctuations, but there
is also a non negligible probability that some of them are due to real
astrophysical events. In most cases it is not possible to recognize the
GRBs based only on the INTEGRAL data, but the detection of afterglows
could confirm some of these events as genuine GRBs.
Several bursts that were confirmed by off-line interactive analysis of the
INTEGRAL data produced triggers above the threshold currently adopted for
the WEAK alerts. Recent examples include the two short bursts GRB 100703A
(GCN Circ. n.10936) and GRB 110112B (GCN Circ. n.11562) and the long burst
GRB 100909A (GCN Circ. n.11260).
WEAK Alert Packets provide a single sky position, with error radius
smaller than 4 arcmin. They are intended for robotic telescopes which can
react without a negative impact on scheduled observing programmes. The
value of SIGMA in the WEAK Alert Packet can be used as a figure of merit.
WEAK Alert Packets may or may not be followed by the usual WAKEUP and/or
REFINED Alert Packets, depending on the evolution of the detected signal.
WEAK alerts for events belows WAKEUP threshold are neither confirmed nor
cancelled with an OFFLINE packet.
For further details see
http://ibas.iasf-milano.inaf.it/IBAS_News.html
It is recommended that current ibas clients upgrade their IBAS Client
Software to the version 2.1.0 (available at
http://www.isdc.unige.ch/integral/analysis#Software), although the
previous versions should process WEAK alert without problems.
|