Gamma-ray Burst 970402

A Gamma-Ray Burst was detected with the GRBM and WFC on April 2, 1997. Quick follow-up pointings with the NFI on BeppoSAX (8 hours) find a new X-ray source which is not detected anymore 2 days after the GRB. This is the second fading X-ray source within a GRB error box!

Previous IAU Circulars

• IAUC 6610 Discovery with WFC onboard BeppoSAX
  
• IAUC 6616 no fading optical object down to R = 21.0 by more than 0.3 mag
• IAUC 6617 fading X-ray source SAX J1450.1-6920 at R.A. =14h50m06s, Decl. = -69o20'.0
• IAUC 6628 no variable optical object down to V = 22.5 and I = 21.7; BL Cir is close to X-ray source
• IAUC 6632 no variable optical object on UKST plate; BL Cir faded to V = 20 from its normal m_pg = 15-16 thus possibly being a R CrB star
• IAUC 6633 accurate position for BL Cir

• The BeppoSAX pointing on April 3 reveals a new, bright X-ray source
  1SAX J1450.1-6920
  within the 3 arcmin GRB error box. The source flux is (1.5 +/- 0.5) x 10E-13 erg cmE-2 sE-1 in the MECS (2-10 keV) and (2.0 +/- 0.6) x 10E-13 erg cmE-2 sE-1 in the LECS (0.5-10 keV).

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  Jochen Greiner, last update: 10-May-1997 [Disclaimer]