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Astron. Astrophys. 330, 14-18 (1998)

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ISO observations of the GRB 970402 error box*

A.J. Castro-Tirado 1, L. Metcalfe 2, R. Laureijs 2, B. Altieri 2, J. Gorosabel 1, L. Hanlon 3, B. McBreen 3, N. Smith 4, E. Costa 5, M. Feroci 5, E. Palazzi 6, L. Nicastro 6, F. Frontera 6, 7, A. Claret 8 and M. Kessler 2

1 Laboratorio de Astrofsica Espacial y Fsica Fundamental, (LAEFF-INTA), P.O. Box 50727, E-28080 Madrid, Spain
2 ISO Science Operations Centre, Astrophysics Division, Space Science Department of ESA, Villafranca, P.O. Box 50727,
E-28080 Madrid, Spain
3 Physics Department, University College, Belfield, Dublin 4, Ireland
4 Regional Technical College, Cork, Ireland
5 Istituto di Astrofsica Spaziale, CNR, Frascati, Italy
6 Istituto Tecnologie e Studio Radiazioni Extraterrestri, CNR, V. P. Gobetti, 101, I-40129 Bologna, Italy
7 Dipartimento di Fisica, Università di Ferrara, I-44100 Ferrara, Italy
8 Service d'Astrophysique, CEA-Saclay, Gif-sur-Yvette, France

Received 5 August 1997 / Accepted 19 August 1997

Abstract

Following the detection by BeppoSAX of GRB 970402, a Target-of-Opportunity Observation by ISO was sheduled for 5 April, about 55-hours after the event, i.e. simultaneous with a second BeppoSAX pointing. The CAM instrument was used in the 6 [FORMULA] /pixel mode, in the 8-15 [FORMULA] m band (IRAS) for covering the entire BeppoSAX GRB error box. A further observation was carried out on 13 April, with a similar set-up. Imaging was performed with the 6 [FORMULA] /pixel mode in the GRB error box, and with the 1.5 [FORMULA] /pixel field of view, in the smaller X-ray source error box. A PHT observation was also performed on 5 April. About 50 sources were detected with ISOCAM in a field centred in the GRB error box. 7 of them lie within the smaller X-ray error circle. With the exception of the variable star BL Cir, no other variable object was found in the entire GRB error box. 5- [FORMULA] upper limits for any new object are F [FORMULA] [FORMULA] 0.14 mJy and F [FORMULA] [FORMULA] 350 mJy.

Key words: gamma rays: bursts – stars: BL Cir – infrared: general

* Based on observations obtained with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) with the participation of ISAS and NASA.

Send offprint requests to: A.J. Castro-Tirado (ajct@laeff.esa.es)

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© European Southern Observatory (ESO) 1998

Online publication: January 8, 1998
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