Binary millisecond pulsar discovery via gamma-ray pulsations

H. J. Pletsch, L. Guillemot, H. Fehrmann, B. Allen, M. Kramer, C. Aulbert, M. Ackermann, M. Ajello, A. De Angelis, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, A. W. Borgland, E. Bottacini, T. J. Brandt, J. BregeonM. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, C. Cecchi, Ö Çelik, E. Charles, R. C G Chaves, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, S. Cutini, F. D'Ammando, C. D. Dermer, S. W. Digel, P. S. Drell, A. Drlica-Wagner, R. Dubois, D. Dumora, C. Favuzzi, E. C. Ferrara, A. Franckowiak, Y. Fukazawa, P. Fusco, F. Gargano, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, G. Godfrey, I. A. Grenier, M. H. Grondin, J. E. Grove, S. Guiriec, D. Hadasch, Y. Hanabata, A. K. Harding, P. R. Den Hartog, M. Hayashida, E. Hays, A. B. Hill, X. Hou, R. E. Hughes, G. Jóhannesson, M. S. Jackson, T. Jogler, A. S. Johnson, W. N. Johnson, Jun Kataoka, M. Kerr, J. Knödlseder, M. Kuss, J. Lande, S. Larsson, L. Latronico, M. Lemoine-Goumard, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, F. Massaro, M. Mayer, M. N. Mazziotta, J. E. McEnery, J. Mehault, P. F. Michelson, W. Mitthumsiri, T. Mizuno, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori, R. Nemmen, E. Nuss, M. Ohno, T. Ohsugi, N. Omodei, M. Orienti, E. Orlando, F. De Palma, D. Paneque, J. S. Perkins, F. Piron, G. Pivato, T. A. Porter, S. Rainò, R. Rando, P. S. Ray, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, S. Ritz, R. W. Romani, C. Romoli, D. A. Sanchez, P. M. Saz Parkinson, A. Schulz, C. Sgrò, E. Do Couto E Silva, E. J. Siskind, D. A. Smith, G. Spandre, P. Spinelli, D. J. Suson, H. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, D. J. Thompson, L. Tibaldo, M. Tinivella, E. Troja, T. L. Usher, J. Vandenbroucke, V. Vasileiou, G. Vianello, V. Vitale, A. P. Waite, B. L. Winer, K. S. Wood, M. Wood, Z. Yang, S. Zimmer

    Research output: Contribution to journalArticle

    72 Citations (Scopus)

    Abstract

    Millisecond pulsars, old neutron stars spun up by accreting matter from a companion star, can reach high rotation rates of hundreds of revolutions per second. Until now, all such "recycled"rotation-powered pulsars have been detected by their spin-modulated radio emission. In a computing-intensive blind search of gamma-ray data from the Fermi Large Area Telescope (with partial constraints from optical data), we detected a 2.5-millisecond pulsar, PSR J1311-3430. This unambiguously explains a formerly unidentified gamma-ray source that had been a decade-long enigma, confirming previous conjectures. The pulsar is in a circular orbit with an orbital period of only 93 minutes, the shortest of any spin-powered pulsar binary ever found.

    Original languageEnglish
    Pages (from-to)1314-1317
    Number of pages4
    JournalScience
    Volume338
    Issue number6112
    DOIs
    Publication statusPublished - 2012 Dec 7

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    Gamma Rays
    Telescopes
    Neutrons
    Orbit
    Radio

    ASJC Scopus subject areas

    • General

    Cite this

    Pletsch, H. J., Guillemot, L., Fehrmann, H., Allen, B., Kramer, M., Aulbert, C., ... Zimmer, S. (2012). Binary millisecond pulsar discovery via gamma-ray pulsations. Science, 338(6112), 1314-1317. https://doi.org/10.1126/science.1229054

    Binary millisecond pulsar discovery via gamma-ray pulsations. / Pletsch, H. J.; Guillemot, L.; Fehrmann, H.; Allen, B.; Kramer, M.; Aulbert, C.; Ackermann, M.; Ajello, M.; De Angelis, A.; Atwood, W. B.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bechtol, K.; Bellazzini, R.; Borgland, A. W.; Bottacini, E.; Brandt, T. J.; Bregeon, J.; Brigida, M.; Bruel, P.; Buehler, R.; Buson, S.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Casandjian, J. M.; Cecchi, C.; Çelik, Ö; Charles, E.; Chaves, R. C G; Cheung, C. C.; Chiang, J.; Ciprini, S.; Claus, R.; Cohen-Tanugi, J.; Conrad, J.; Cutini, S.; D'Ammando, F.; Dermer, C. D.; Digel, S. W.; Drell, P. S.; Drlica-Wagner, A.; Dubois, R.; Dumora, D.; Favuzzi, C.; Ferrara, E. C.; Franckowiak, A.; Fukazawa, Y.; Fusco, P.; Gargano, F.; Gehrels, N.; Germani, S.; Giglietto, N.; Giordano, F.; Giroletti, M.; Godfrey, G.; Grenier, I. A.; Grondin, M. H.; Grove, J. E.; Guiriec, S.; Hadasch, D.; Hanabata, Y.; Harding, A. K.; Den Hartog, P. R.; Hayashida, M.; Hays, E.; Hill, A. B.; Hou, X.; Hughes, R. E.; Jóhannesson, G.; Jackson, M. S.; Jogler, T.; Johnson, A. S.; Johnson, W. N.; Kataoka, Jun; Kerr, M.; Knödlseder, J.; Kuss, M.; Lande, J.; Larsson, S.; Latronico, L.; Lemoine-Goumard, M.; Longo, F.; Loparco, F.; Lovellette, M. N.; Lubrano, P.; Massaro, F.; Mayer, M.; Mazziotta, M. N.; McEnery, J. E.; Mehault, J.; Michelson, P. F.; Mitthumsiri, W.; Mizuno, T.; Monzani, M. E.; Morselli, A.; Moskalenko, I. V.; Murgia, S.; Nakamori, T.; Nemmen, R.; Nuss, E.; Ohno, M.; Ohsugi, T.; Omodei, N.; Orienti, M.; Orlando, E.; De Palma, F.; Paneque, D.; Perkins, J. S.; Piron, F.; Pivato, G.; Porter, T. A.; Rainò, S.; Rando, R.; Ray, P. S.; Razzano, M.; Reimer, A.; Reimer, O.; Reposeur, T.; Ritz, S.; Romani, R. W.; Romoli, C.; Sanchez, D. A.; Saz Parkinson, P. M.; Schulz, A.; Sgrò, C.; Do Couto E Silva, E.; Siskind, E. J.; Smith, D. A.; Spandre, G.; Spinelli, P.; Suson, D. J.; Takahashi, H.; Tanaka, T.; Thayer, J. B.; Thayer, J. G.; Thompson, D. J.; Tibaldo, L.; Tinivella, M.; Troja, E.; Usher, T. L.; Vandenbroucke, J.; Vasileiou, V.; Vianello, G.; Vitale, V.; Waite, A. P.; Winer, B. L.; Wood, K. S.; Wood, M.; Yang, Z.; Zimmer, S.

    In: Science, Vol. 338, No. 6112, 07.12.2012, p. 1314-1317.

    Research output: Contribution to journalArticle

    Pletsch, HJ, Guillemot, L, Fehrmann, H, Allen, B, Kramer, M, Aulbert, C, Ackermann, M, Ajello, M, De Angelis, A, Atwood, WB, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Borgland, AW, Bottacini, E, Brandt, TJ, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Casandjian, JM, Cecchi, C, Çelik, Ö, Charles, E, Chaves, RCG, Cheung, CC, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Cutini, S, D'Ammando, F, Dermer, CD, Digel, SW, Drell, PS, Drlica-Wagner, A, Dubois, R, Dumora, D, Favuzzi, C, Ferrara, EC, Franckowiak, A, Fukazawa, Y, Fusco, P, Gargano, F, Gehrels, N, Germani, S, Giglietto, N, Giordano, F, Giroletti, M, Godfrey, G, Grenier, IA, Grondin, MH, Grove, JE, Guiriec, S, Hadasch, D, Hanabata, Y, Harding, AK, Den Hartog, PR, Hayashida, M, Hays, E, Hill, AB, Hou, X, Hughes, RE, Jóhannesson, G, Jackson, MS, Jogler, T, Johnson, AS, Johnson, WN, Kataoka, J, Kerr, M, Knödlseder, J, Kuss, M, Lande, J, Larsson, S, Latronico, L, Lemoine-Goumard, M, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Massaro, F, Mayer, M, Mazziotta, MN, McEnery, JE, Mehault, J, Michelson, PF, Mitthumsiri, W, Mizuno, T, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nakamori, T, Nemmen, R, Nuss, E, Ohno, M, Ohsugi, T, Omodei, N, Orienti, M, Orlando, E, De Palma, F, Paneque, D, Perkins, JS, Piron, F, Pivato, G, Porter, TA, Rainò, S, Rando, R, Ray, PS, Razzano, M, Reimer, A, Reimer, O, Reposeur, T, Ritz, S, Romani, RW, Romoli, C, Sanchez, DA, Saz Parkinson, PM, Schulz, A, Sgrò, C, Do Couto E Silva, E, Siskind, EJ, Smith, DA, Spandre, G, Spinelli, P, Suson, DJ, Takahashi, H, Tanaka, T, Thayer, JB, Thayer, JG, Thompson, DJ, Tibaldo, L, Tinivella, M, Troja, E, Usher, TL, Vandenbroucke, J, Vasileiou, V, Vianello, G, Vitale, V, Waite, AP, Winer, BL, Wood, KS, Wood, M, Yang, Z & Zimmer, S 2012, 'Binary millisecond pulsar discovery via gamma-ray pulsations', Science, vol. 338, no. 6112, pp. 1314-1317. https://doi.org/10.1126/science.1229054
    Pletsch HJ, Guillemot L, Fehrmann H, Allen B, Kramer M, Aulbert C et al. Binary millisecond pulsar discovery via gamma-ray pulsations. Science. 2012 Dec 7;338(6112):1314-1317. https://doi.org/10.1126/science.1229054
    Pletsch, H. J. ; Guillemot, L. ; Fehrmann, H. ; Allen, B. ; Kramer, M. ; Aulbert, C. ; Ackermann, M. ; Ajello, M. ; De Angelis, A. ; Atwood, W. B. ; Baldini, L. ; Ballet, J. ; Barbiellini, G. ; Bastieri, D. ; Bechtol, K. ; Bellazzini, R. ; Borgland, A. W. ; Bottacini, E. ; Brandt, T. J. ; Bregeon, J. ; Brigida, M. ; Bruel, P. ; Buehler, R. ; Buson, S. ; Caliandro, G. A. ; Cameron, R. A. ; Caraveo, P. A. ; Casandjian, J. M. ; Cecchi, C. ; Çelik, Ö ; Charles, E. ; Chaves, R. C G ; Cheung, C. C. ; Chiang, J. ; Ciprini, S. ; Claus, R. ; Cohen-Tanugi, J. ; Conrad, J. ; Cutini, S. ; D'Ammando, F. ; Dermer, C. D. ; Digel, S. W. ; Drell, P. S. ; Drlica-Wagner, A. ; Dubois, R. ; Dumora, D. ; Favuzzi, C. ; Ferrara, E. C. ; Franckowiak, A. ; Fukazawa, Y. ; Fusco, P. ; Gargano, F. ; Gehrels, N. ; Germani, S. ; Giglietto, N. ; Giordano, F. ; Giroletti, M. ; Godfrey, G. ; Grenier, I. A. ; Grondin, M. H. ; Grove, J. E. ; Guiriec, S. ; Hadasch, D. ; Hanabata, Y. ; Harding, A. K. ; Den Hartog, P. R. ; Hayashida, M. ; Hays, E. ; Hill, A. B. ; Hou, X. ; Hughes, R. E. ; Jóhannesson, G. ; Jackson, M. S. ; Jogler, T. ; Johnson, A. S. ; Johnson, W. N. ; Kataoka, Jun ; Kerr, M. ; Knödlseder, J. ; Kuss, M. ; Lande, J. ; Larsson, S. ; Latronico, L. ; Lemoine-Goumard, M. ; Longo, F. ; Loparco, F. ; Lovellette, M. N. ; Lubrano, P. ; Massaro, F. ; Mayer, M. ; Mazziotta, M. N. ; McEnery, J. E. ; Mehault, J. ; Michelson, P. F. ; Mitthumsiri, W. ; Mizuno, T. ; Monzani, M. E. ; Morselli, A. ; Moskalenko, I. V. ; Murgia, S. ; Nakamori, T. ; Nemmen, R. ; Nuss, E. ; Ohno, M. ; Ohsugi, T. ; Omodei, N. ; Orienti, M. ; Orlando, E. ; De Palma, F. ; Paneque, D. ; Perkins, J. S. ; Piron, F. ; Pivato, G. ; Porter, T. A. ; Rainò, S. ; Rando, R. ; Ray, P. S. ; Razzano, M. ; Reimer, A. ; Reimer, O. ; Reposeur, T. ; Ritz, S. ; Romani, R. W. ; Romoli, C. ; Sanchez, D. A. ; Saz Parkinson, P. M. ; Schulz, A. ; Sgrò, C. ; Do Couto E Silva, E. ; Siskind, E. J. ; Smith, D. A. ; Spandre, G. ; Spinelli, P. ; Suson, D. J. ; Takahashi, H. ; Tanaka, T. ; Thayer, J. B. ; Thayer, J. G. ; Thompson, D. J. ; Tibaldo, L. ; Tinivella, M. ; Troja, E. ; Usher, T. L. ; Vandenbroucke, J. ; Vasileiou, V. ; Vianello, G. ; Vitale, V. ; Waite, A. P. ; Winer, B. L. ; Wood, K. S. ; Wood, M. ; Yang, Z. ; Zimmer, S. / Binary millisecond pulsar discovery via gamma-ray pulsations. In: Science. 2012 ; Vol. 338, No. 6112. pp. 1314-1317.
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    title = "Binary millisecond pulsar discovery via gamma-ray pulsations",
    abstract = "Millisecond pulsars, old neutron stars spun up by accreting matter from a companion star, can reach high rotation rates of hundreds of revolutions per second. Until now, all such {"}recycled{"}rotation-powered pulsars have been detected by their spin-modulated radio emission. In a computing-intensive blind search of gamma-ray data from the Fermi Large Area Telescope (with partial constraints from optical data), we detected a 2.5-millisecond pulsar, PSR J1311-3430. This unambiguously explains a formerly unidentified gamma-ray source that had been a decade-long enigma, confirming previous conjectures. The pulsar is in a circular orbit with an orbital period of only 93 minutes, the shortest of any spin-powered pulsar binary ever found.",
    author = "Pletsch, {H. J.} and L. Guillemot and H. Fehrmann and B. Allen and M. Kramer and C. Aulbert and M. Ackermann and M. Ajello and {De Angelis}, A. and Atwood, {W. B.} and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and K. Bechtol and R. Bellazzini and Borgland, {A. W.} and E. Bottacini and Brandt, {T. J.} and J. Bregeon and M. Brigida and P. Bruel and R. Buehler and S. Buson and Caliandro, {G. A.} and Cameron, {R. A.} and Caraveo, {P. A.} and Casandjian, {J. M.} and C. Cecchi and {\"O} {\cC}elik and E. Charles and Chaves, {R. C G} and Cheung, {C. C.} and J. Chiang and S. Ciprini and R. Claus and J. Cohen-Tanugi and J. Conrad and S. Cutini and F. D'Ammando and Dermer, {C. D.} and Digel, {S. W.} and Drell, {P. S.} and A. Drlica-Wagner and R. Dubois and D. Dumora and C. Favuzzi and Ferrara, {E. C.} and A. Franckowiak and Y. Fukazawa and P. Fusco and F. Gargano and N. Gehrels and S. Germani and N. Giglietto and F. Giordano and M. Giroletti and G. Godfrey and Grenier, {I. A.} and Grondin, {M. H.} and Grove, {J. E.} and S. Guiriec and D. Hadasch and Y. Hanabata and Harding, {A. K.} and {Den Hartog}, {P. R.} and M. Hayashida and E. Hays and Hill, {A. B.} and X. Hou and Hughes, {R. E.} and G. J{\'o}hannesson and Jackson, {M. S.} and T. Jogler and Johnson, {A. S.} and Johnson, {W. N.} and Jun Kataoka and M. Kerr and J. Kn{\"o}dlseder and M. Kuss and J. Lande and S. Larsson and L. Latronico and M. Lemoine-Goumard and F. Longo and F. Loparco and Lovellette, {M. N.} and P. Lubrano and F. Massaro and M. Mayer and Mazziotta, {M. N.} and McEnery, {J. E.} and J. Mehault and Michelson, {P. F.} and W. Mitthumsiri and T. Mizuno and Monzani, {M. E.} and A. Morselli and Moskalenko, {I. V.} and S. Murgia and T. Nakamori and R. Nemmen and E. Nuss and M. Ohno and T. Ohsugi and N. Omodei and M. Orienti and E. Orlando and {De Palma}, F. and D. Paneque and Perkins, {J. S.} and F. Piron and G. Pivato and Porter, {T. A.} and S. Rain{\`o} and R. Rando and Ray, {P. S.} and M. Razzano and A. Reimer and O. Reimer and T. Reposeur and S. Ritz and Romani, {R. W.} and C. Romoli and Sanchez, {D. A.} and {Saz Parkinson}, {P. M.} and A. Schulz and C. Sgr{\`o} and {Do Couto E Silva}, E. and Siskind, {E. J.} and Smith, {D. A.} and G. Spandre and P. Spinelli and Suson, {D. J.} and H. Takahashi and T. Tanaka and Thayer, {J. B.} and Thayer, {J. G.} and Thompson, {D. J.} and L. Tibaldo and M. Tinivella and E. Troja and Usher, {T. L.} and J. Vandenbroucke and V. Vasileiou and G. Vianello and V. Vitale and Waite, {A. P.} and Winer, {B. L.} and Wood, {K. S.} and M. Wood and Z. Yang and S. Zimmer",
    year = "2012",
    month = "12",
    day = "7",
    doi = "10.1126/science.1229054",
    language = "English",
    volume = "338",
    pages = "1314--1317",
    journal = "Science",
    issn = "0036-8075",
    publisher = "American Association for the Advancement of Science",
    number = "6112",

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    TY - JOUR

    T1 - Binary millisecond pulsar discovery via gamma-ray pulsations

    AU - Pletsch, H. J.

    AU - Guillemot, L.

    AU - Fehrmann, H.

    AU - Allen, B.

    AU - Kramer, M.

    AU - Aulbert, C.

    AU - Ackermann, M.

    AU - Ajello, M.

    AU - De Angelis, A.

    AU - Atwood, W. B.

    AU - Baldini, L.

    AU - Ballet, J.

    AU - Barbiellini, G.

    AU - Bastieri, D.

    AU - Bechtol, K.

    AU - Bellazzini, R.

    AU - Borgland, A. W.

    AU - Bottacini, E.

    AU - Brandt, T. J.

    AU - Bregeon, J.

    AU - Brigida, M.

    AU - Bruel, P.

    AU - Buehler, R.

    AU - Buson, S.

    AU - Caliandro, G. A.

    AU - Cameron, R. A.

    AU - Caraveo, P. A.

    AU - Casandjian, J. M.

    AU - Cecchi, C.

    AU - Çelik, Ö

    AU - Charles, E.

    AU - Chaves, R. C G

    AU - Cheung, C. C.

    AU - Chiang, J.

    AU - Ciprini, S.

    AU - Claus, R.

    AU - Cohen-Tanugi, J.

    AU - Conrad, J.

    AU - Cutini, S.

    AU - D'Ammando, F.

    AU - Dermer, C. D.

    AU - Digel, S. W.

    AU - Drell, P. S.

    AU - Drlica-Wagner, A.

    AU - Dubois, R.

    AU - Dumora, D.

    AU - Favuzzi, C.

    AU - Ferrara, E. C.

    AU - Franckowiak, A.

    AU - Fukazawa, Y.

    AU - Fusco, P.

    AU - Gargano, F.

    AU - Gehrels, N.

    AU - Germani, S.

    AU - Giglietto, N.

    AU - Giordano, F.

    AU - Giroletti, M.

    AU - Godfrey, G.

    AU - Grenier, I. A.

    AU - Grondin, M. H.

    AU - Grove, J. E.

    AU - Guiriec, S.

    AU - Hadasch, D.

    AU - Hanabata, Y.

    AU - Harding, A. K.

    AU - Den Hartog, P. R.

    AU - Hayashida, M.

    AU - Hays, E.

    AU - Hill, A. B.

    AU - Hou, X.

    AU - Hughes, R. E.

    AU - Jóhannesson, G.

    AU - Jackson, M. S.

    AU - Jogler, T.

    AU - Johnson, A. S.

    AU - Johnson, W. N.

    AU - Kataoka, Jun

    AU - Kerr, M.

    AU - Knödlseder, J.

    AU - Kuss, M.

    AU - Lande, J.

    AU - Larsson, S.

    AU - Latronico, L.

    AU - Lemoine-Goumard, M.

    AU - Longo, F.

    AU - Loparco, F.

    AU - Lovellette, M. N.

    AU - Lubrano, P.

    AU - Massaro, F.

    AU - Mayer, M.

    AU - Mazziotta, M. N.

    AU - McEnery, J. E.

    AU - Mehault, J.

    AU - Michelson, P. F.

    AU - Mitthumsiri, W.

    AU - Mizuno, T.

    AU - Monzani, M. E.

    AU - Morselli, A.

    AU - Moskalenko, I. V.

    AU - Murgia, S.

    AU - Nakamori, T.

    AU - Nemmen, R.

    AU - Nuss, E.

    AU - Ohno, M.

    AU - Ohsugi, T.

    AU - Omodei, N.

    AU - Orienti, M.

    AU - Orlando, E.

    AU - De Palma, F.

    AU - Paneque, D.

    AU - Perkins, J. S.

    AU - Piron, F.

    AU - Pivato, G.

    AU - Porter, T. A.

    AU - Rainò, S.

    AU - Rando, R.

    AU - Ray, P. S.

    AU - Razzano, M.

    AU - Reimer, A.

    AU - Reimer, O.

    AU - Reposeur, T.

    AU - Ritz, S.

    AU - Romani, R. W.

    AU - Romoli, C.

    AU - Sanchez, D. A.

    AU - Saz Parkinson, P. M.

    AU - Schulz, A.

    AU - Sgrò, C.

    AU - Do Couto E Silva, E.

    AU - Siskind, E. J.

    AU - Smith, D. A.

    AU - Spandre, G.

    AU - Spinelli, P.

    AU - Suson, D. J.

    AU - Takahashi, H.

    AU - Tanaka, T.

    AU - Thayer, J. B.

    AU - Thayer, J. G.

    AU - Thompson, D. J.

    AU - Tibaldo, L.

    AU - Tinivella, M.

    AU - Troja, E.

    AU - Usher, T. L.

    AU - Vandenbroucke, J.

    AU - Vasileiou, V.

    AU - Vianello, G.

    AU - Vitale, V.

    AU - Waite, A. P.

    AU - Winer, B. L.

    AU - Wood, K. S.

    AU - Wood, M.

    AU - Yang, Z.

    AU - Zimmer, S.

    PY - 2012/12/7

    Y1 - 2012/12/7

    N2 - Millisecond pulsars, old neutron stars spun up by accreting matter from a companion star, can reach high rotation rates of hundreds of revolutions per second. Until now, all such "recycled"rotation-powered pulsars have been detected by their spin-modulated radio emission. In a computing-intensive blind search of gamma-ray data from the Fermi Large Area Telescope (with partial constraints from optical data), we detected a 2.5-millisecond pulsar, PSR J1311-3430. This unambiguously explains a formerly unidentified gamma-ray source that had been a decade-long enigma, confirming previous conjectures. The pulsar is in a circular orbit with an orbital period of only 93 minutes, the shortest of any spin-powered pulsar binary ever found.

    AB - Millisecond pulsars, old neutron stars spun up by accreting matter from a companion star, can reach high rotation rates of hundreds of revolutions per second. Until now, all such "recycled"rotation-powered pulsars have been detected by their spin-modulated radio emission. In a computing-intensive blind search of gamma-ray data from the Fermi Large Area Telescope (with partial constraints from optical data), we detected a 2.5-millisecond pulsar, PSR J1311-3430. This unambiguously explains a formerly unidentified gamma-ray source that had been a decade-long enigma, confirming previous conjectures. The pulsar is in a circular orbit with an orbital period of only 93 minutes, the shortest of any spin-powered pulsar binary ever found.

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