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Astron. Astrophys. 347, 92-98 (1999)

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SCUBA sub-millimeter observations of gamma-ray bursters

I. GRB 970508, 971214, 980326, 980329, 980519, 980703, 981220, 981226

I.A. Smith 1, R.P.J. Tilanus 2, J. van Paradijs 3,4, T.J. Galama 3, P.J. Groot 3, P. Vreeswijk 3, C. Kouveliotou 5, R.A.M.J. Wijers 6 and N. Tanvir 7

1 Department of Space Physics and Astronomy, Rice University, MS-108, 6100 South Main, Houston, TX 77005-1892, USA
2 Joint Astronomy Centre, 660 N. Aohoku Place, Hilo, HI 96720, USA
3 Astronomical Institute `Anton Pannekoek', University of Amsterdam and Center for High-Energy Astrophysics, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
4 Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899, USA
5 Universities Space Research Association, NASA Marshall Space Flight Center, ES-62, Huntsville, AL 35812, USA
6 Department of Physics and Astronomy, SUNY, Stony Brook, NY 11794-3800, USA
7 Department of Physical Sciences, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB, UK

Received 2 November 1998 / Accepted 23 March 1999

Abstract

We discuss our ongoing program of Target of Opportunity observations of gamma-ray bursts (GRBs) using the SCUBA instrument on the James Clerk Maxwell Telescope. We present observations of GRB 970508, 971214, 980326, 980329, 980519, 980703, 981220, and 981226.

Our most important result to date is the detection of a fading counterpart to GRB 980329 at 850 µm. Although it proved to be difficult to find the infrared counterpart to this burst, the sub-millimeter flux was relatively bright. This indicates that the brightness of this counterpart (corrected for absorption) was very similar to GRB 970508. The radio through sub-millimeter spectrum of GRB 980329 is well fit by a power law with index [FORMULA]. However, we cannot exclude a [FORMULA] power law attenuated by synchrotron self-absorption. An [FORMULA] VLA-SCUBA power law spectrum is definitely ruled out for GRB 980703, and possibly also for GRB 980519.

We cannot rule out that part of the sub-millimeter flux from GRB 980329 comes from a dusty star-forming galaxy at high redshift, such as the ones recently discovered by SCUBA. Any quiescent dust contribution will be much larger at sub-millimeter than at radio wavelengths. Both a high redshift and large dust extinction would help explain the reddening of the counterpart to GRB 980329. The large intensity of this burst might then indicate that beaming is important.

Key words: gamma rays: bursts – radio continuum: general – infrared: general

Send offprint requests to: Ian A. Smith

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© European Southern Observatory (ESO) 1999

Online publication: June 18, 1999
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