GCN Circular 427
Subject
GRB 991014 - BeppoSAX NFI observations
Date
1999-10-22T16:32:48Z (25 years ago)
From
Jean in't Zand at SRON <jeanz@sron.nl>
J. in 't Zand and L. Kuiper, Space Research Organization Netherlands,
Utrecht; L.A. Antonelli, Osservatorio Astronomico di Roma; A. Coletta,
S. Rebecchi, M. Stornelli, M. Capalbi, BeppoSAX Science Operations Center,
Telespazio, Rome; and G. Gandolfi, Istituto di Astrofisica Spaziale, CNR,
Rome, report: "GRB 991014 was observed with the Narrow Field Instruments
(NFI) on board BeppoSAX from Oct. 15.4 to 16.4 UT (starting 13.0 hrs
after the burst trigger time). In the 2-10 keV image of all data from both
Medium-Energy Concentrator Spectrometer units 2 and 3, two point sources are
apparent within the WFC/IPN combined error box (Tassone et al., IAUC 7281,
Hurley et al. GCN 419). Their positions are R.A. = 6h51m03s,
Decl. = +11d36'05" (S1) and R.A. = 6h50m59s, Decl. = +11d33'09" (S2,
Eq. 2000.0). The error radius for both sources is 1'.5. Neither S1 nor S2 show
conclusive evidence of decay, but this is a statistical issue rather than a
meaningful statement about the decay index. To search for a decay and
possibly identify the afterglow with S1 or S2, another NFI pointing is
scheduled for Oct. 24.