[AAVSO-HEN] GRB 090107B: a long GRB localized by INTEGRAL

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
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TITLE:   GCN CIRCULAR
NUMBER:  8786
SUBJECT: GRB 090107B: a long GRB localized by INTEGRAL
DATE:    09/01/07 17:05:19 GMT
FROM:    Diego Gotz at CEA  <diego.gotz at cea.fr>

D. Gotz (CEA-Saclay), S.Mereghetti, A.Paizis (IASF-Milano), C. Ferrigno,
V.Beckmann, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on
behalf of the IBAS Localization Team report:

A GRB lasting about 20 s has been detected by IBAS in IBIS/ISGRI data at
16:20:36 UT on January 7th. The refined coordinates (J2000)  are:

RA = 284.8075 [degrees]
DEC= 59.5924 [degrees]

with an uncertainty of 1.5 arcmin (90% c.l.).

A preliminary analysis gives a peak flux in the 20-200 keV range of
about 1.6 ph/cmsq/s (1-s integration time) and a fluence over the  
same energy
range of about 1.5e-6 erg/cmsq. Both values have to be considered  
lower limits,
since the burst is affected by telemetry saturation.

A plot of the light curve will be posted at

http://ibas.iasf-milano.inaf.it/IBAS_Results.html

This message can be cited.