ABSTRACT During a search for X-ray counterparts of the COS B≥100 MeV γ-ray sources (see refs 1, 2), observations using the Einstein Observatory revealed a new X-ray source, 1E0630 + 178,

inside the ∼1/2 square degree error box of the γ-ray source 2GC195+4, ‘Geminga’3. On the basis of its interesting properties, this source has been proposed as the X-ray counterpart of

Geminga. A faint (mv∼21), star-like object lying at the inner boundary of the HRI 98% error box has been suggested4–7 as the optical counterpart of the X-ray (and thus the γ-ray) source. No

radio counterpart has been detected, despite several searches7,12,13. The region of Geminga was observed with the European Space Agency (ESA) Exosat satellite on 9–10 September 1983, from

UFU source, also not detected by Einstein's Monitor Proportional Counter (MPC). Access through your institution Buy or subscribe This is a preview of subscription content, access via

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COLLAPSAR Article 26 July 2021 ULTRA-HIGH-ENERGY GAMMA-RAY BUBBLE AROUND MICROQUASAR V4641 SGR Article 16 October 2024 ULTRAHIGH-ENERGY PHOTONS UP TO 1.4 PETAELECTRONVOLTS FROM 12 Γ-RAY

GALACTIC SOURCES Article 17 May 2021 REFERENCES * Caraveo, P. A. _Space Sci. Rev._ 36, 207 (1983). Article  ADS  Google Scholar  * Bignami, G. F. & Hermsen, W. _A. Rev. Astr. Astrophys._

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& Lamb, R. C. _Adv. Space Res._ (1984b). * Hertz, P. thesis, Harvard Univ. (1983). * Herz, P. & Grindlay, J. E. _Astrophys. J._ (in the press). * Exosat Observers Guide Rev. 1. (ESA,

January 1984). * Mereghetti, A. thesis, Univ. Milan. (1984). * Sieber, W. & Schlickeiser, R. _Astr. Astrophys._ 113, 314 (1982). ADS  CAS  Google Scholar  * Spoelstra, T. A. Th. &

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AFFILIATIONS * Istituto de Fisica Cosmica del CNR, Via Bassini 15, 20133, Milano, Italy P. A. Caraveo & G. F. Bignami * Space Science Department of ESA, Exosat Observatory, ESOC,

Darmstadt, FRG P. Giommi * Dipartimento di Fisica, Università di Milano, Via Celoria 16, 20133, Milano, Italy S. Mereghetti * Service d'Astrophysique, CEA, Saclay, France J. A. Paul

Authors * P. A. Caraveo View author publications You can also search for this author inPubMed Google Scholar * G. F. Bignami View author publications You can also search for this author

inPubMed Google Scholar * P. Giommi View author publications You can also search for this author inPubMed Google Scholar * S. Mereghetti View author publications You can also search for this

author inPubMed Google Scholar * J. A. Paul View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS

ARTICLE CITE THIS ARTICLE Caraveo, P., Bignami, G., Giommi, P. _et al._ Exosat observation of the candidate X-ray counterpart of Geminga. _Nature_ 310, 481–483 (1984).

https://doi.org/10.1038/310481a0 Download citation * Received: 20 February 1984 * Accepted: 11 May 1984 * Issue Date: 09 August 1984 * DOI: https://doi.org/10.1038/310481a0 SHARE THIS

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