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Millimetre Observations of Gamma-ray Bursts at IRAM

  • A.J. Castro-Tirado (a1), M. Bremer (a2), J. M. Winters (a2), J. C. Tello (a1), S. B. Pandey (a3), A. de Ugarte Postigo (a1) (a4), J. Gorosabel (a1) (a5) (a6), S. Guziy (a7), M. Jelinek (a1), R. Sánchez-Ramírez (a1), D. Pérez-Ramírez (a8) and J.M. Castro Cerón (a9)...

Abstract

Since 1997, and following our detection of the first mm afterglow, we have followed-up 70 GRBs, mainly with the IRAMś Plateau de Bure Interferometer, what can be considered as the IRAM Legacy GRB Sample. 66 events were observed at 3 mm, with 19 of them being detected (with another 3 having marginal detections). 32 GRBs were followed up at 1 mm, with 6 of them being detected. Redshifts for the GRB afterglows lie in the range z = 0.03–8.3, with measured flux densities (at 3 mm) varying between 0.25 and 60 mJy (but usually <1.5 mJy) with first observations taking place around 1–2 days after the GRB. Forward shock emission expleains the observations with the exception of one particular case (GRB 090423 at z = 8.2) for which reverse shock emission is required.

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References

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[1] Bremer, M., Krichbaum, T.P., Galama, T.J., et al., 1998, A&A 332, L13
[2] Castro-Tirado, A.J., Bremer, M., Winters, J.-M., et al., 2013, in press
[3] Guilloteau, S., Delannoy, J., Downes, D., et al., 1992, A&A 262, 624
[4] de Ugarte Postigo, A., Lundgren, A., Martín, S., et al., 2012, A&A, 538, A44

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