Belanger, G.

Brandt, S.

Budtz-Jørgensen, C.

Chenevez, J.

Goldoni, P.

Goldwurm, A.

Kuulkers, E.

Lund, N.

During an observation of the Galactic Center the JEM-X instrument on INTEGRAL detected an unusally long X-ray burst from GX 3+1. The burst began on August 31 at 18:57 UTCAfter an precursor spike lasting 7 s where the burst reached a flux of about 2000 mCrab in the 4 to 20 keV band the flux fell to around 500 mCrab and then decayed with an e-folding time of about 700 s. This burst appear as intermediate between the normal type-I X-ray bursts (e-folding times up to a few tens of seconds) and the very long "superbursts" (e-folding times of several hours).Prior to the outburst the source flux was about 150 mCrab.Follow-up observations are encouraged

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Long duration X-ray burst from GX 3+1

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Long duration X-ray burst from GX 3+1

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