Egret gamma-ray sources: GRO J0744+54 and GRO J0957+65 (=BL Lacertae object 0954+658)

R. Mukherjee; H. D. Aller; M. F. Aller; D. L. Bertsch; W. Collmar; S. W. Digel; B. L. Dingus; J. A. Esposito; C. E. Fichtel; R. C. Hartman; S. D. Hunter; W. N. Johnson; G. Kanbach; D. A. Kniffen; Y. C. Lin; J. R. Mattox; H. A. Mayer-Hasselwander; P. F. Michelson; C. Von Montigny; P. L. Nolan; P. V. Ramanamurthy; E. Schneid; P. Sreekumar; H. Teräsranta; D. J. Thompson; S. J. Wagner

doi:10.1086/175685

Egret gamma-ray sources: GRO J0744+54 and GRO J0957+65 (=BL Lacertae object 0954+658)

R. Mukherjee^*, H. D. Aller, M. F. Aller, D. L. Bertsch, W. Collmar, S. W. Digel, B. L. Dingus, J. A. Esposito, C. E. Fichtel, R. C. Hartman, S. D. Hunter, W. N. Johnson, G. Kanbach, D. A. Kniffen, Y. C. Lin, J. R. Mattox, H. A. Mayer-Hasselwander, P. F. Michelson, C. Von Montigny, P. L. NolanP. V. Ramanamurthy, E. Schneid, P. Sreekumar, H. Teräsranta, D. J. Thompson, S. J. Wagner

^*Corresponding author for this work

Manipal Centre for Natural Sciences, Manipal

Research output: Contribution to journal › Article › peer-review

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Abstract

EGRET detected an unidentified source, GRO J0744+54, at a significance of 6.5 σ, during its observations from 1993 June 28 to July 12. The source was seen again in the following 2 week viewing period and was weakly evident in the earlier phase 1 of the EGRET observations. Considering the variability of its gammaray flux, and its location at high Galactic latitude, GRO J0744+54 is likely to be a previously undetected blazar. Its most likely identification is with the radio source 87GB 073840.5+545138. A second source, GRO J0957+65, was seen by EGRET during the same two viewing periods at a combined significance of 5.7 σ. The most probable counterpart of GRO J0957+65 is the BL Lacertae object 0954+658. The spectra, time variability, and positions of the two sources are presented. Multiwavelength observations of 0954+658 are also presented.

Original language	English
Pages (from-to)	189-195
Number of pages	7
Journal	Astrophysical Journal
Volume	445
Issue number	1
DOIs	https://doi.org/10.1086/175685
Publication status	Published - 20-05-1995

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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Mukherjee, R., Aller, H. D., Aller, M. F., Bertsch, D. L., Collmar, W., Digel, S. W., Dingus, B. L., Esposito, J. A., Fichtel, C. E., Hartman, R. C., Hunter, S. D., Johnson, W. N., Kanbach, G., Kniffen, D. A., Lin, Y. C., Mattox, J. R., Mayer-Hasselwander, H. A., Michelson, P. F., Von Montigny, C., ... Wagner, S. J. (1995). Egret gamma-ray sources: GRO J0744+54 and GRO J0957+65 (=BL Lacertae object 0954+658). Astrophysical Journal, 445(1), 189-195. https://doi.org/10.1086/175685

@article{009ba3ef5c2d4be59ee341432ca179fe,

title = "Egret gamma-ray sources: GRO J0744+54 and GRO J0957+65 (=BL Lacertae object 0954+658)",

abstract = "EGRET detected an unidentified source, GRO J0744+54, at a significance of 6.5 σ, during its observations from 1993 June 28 to July 12. The source was seen again in the following 2 week viewing period and was weakly evident in the earlier phase 1 of the EGRET observations. Considering the variability of its gammaray flux, and its location at high Galactic latitude, GRO J0744+54 is likely to be a previously undetected blazar. Its most likely identification is with the radio source 87GB 073840.5+545138. A second source, GRO J0957+65, was seen by EGRET during the same two viewing periods at a combined significance of 5.7 σ. The most probable counterpart of GRO J0957+65 is the BL Lacertae object 0954+658. The spectra, time variability, and positions of the two sources are presented. Multiwavelength observations of 0954+658 are also presented.",

author = "R. Mukherjee and Aller, \{H. D.\} and Aller, \{M. F.\} and Bertsch, \{D. L.\} and W. Collmar and Digel, \{S. W.\} and Dingus, \{B. L.\} and Esposito, \{J. A.\} and Fichtel, \{C. E.\} and Hartman, \{R. C.\} and Hunter, \{S. D.\} and Johnson, \{W. N.\} and G. Kanbach and Kniffen, \{D. A.\} and Lin, \{Y. C.\} and Mattox, \{J. R.\} and Mayer-Hasselwander, \{H. A.\} and Michelson, \{P. F.\} and \{Von Montigny\}, C. and Nolan, \{P. L.\} and Ramanamurthy, \{P. V.\} and E. Schneid and P. Sreekumar and H. Ter{\"a}sranta and Thompson, \{D. J.\} and Wagner, \{S. J.\}",

year = "1995",

month = may,

day = "20",

doi = "10.1086/175685",

language = "English",

volume = "445",

pages = "189--195",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Mukherjee, R, Aller, HD, Aller, MF, Bertsch, DL, Collmar, W, Digel, SW, Dingus, BL, Esposito, JA, Fichtel, CE, Hartman, RC, Hunter, SD, Johnson, WN, Kanbach, G, Kniffen, DA, Lin, YC, Mattox, JR, Mayer-Hasselwander, HA, Michelson, PF, Von Montigny, C, Nolan, PL, Ramanamurthy, PV, Schneid, E, Sreekumar, P, Teräsranta, H, Thompson, DJ & Wagner, SJ 1995, 'Egret gamma-ray sources: GRO J0744+54 and GRO J0957+65 (=BL Lacertae object 0954+658)', Astrophysical Journal, vol. 445, no. 1, pp. 189-195. https://doi.org/10.1086/175685

TY - JOUR

T1 - Egret gamma-ray sources

T2 - GRO J0744+54 and GRO J0957+65 (=BL Lacertae object 0954+658)

AU - Mukherjee, R.

AU - Aller, H. D.

AU - Aller, M. F.

AU - Bertsch, D. L.

AU - Collmar, W.

AU - Digel, S. W.

AU - Dingus, B. L.

AU - Esposito, J. A.

AU - Fichtel, C. E.

AU - Hartman, R. C.

AU - Hunter, S. D.

AU - Johnson, W. N.

AU - Kanbach, G.

AU - Kniffen, D. A.

AU - Lin, Y. C.

AU - Mattox, J. R.

AU - Mayer-Hasselwander, H. A.

AU - Michelson, P. F.

AU - Von Montigny, C.

AU - Nolan, P. L.

AU - Ramanamurthy, P. V.

AU - Schneid, E.

AU - Sreekumar, P.

AU - Teräsranta, H.

AU - Thompson, D. J.

AU - Wagner, S. J.

PY - 1995/5/20

Y1 - 1995/5/20

N2 - EGRET detected an unidentified source, GRO J0744+54, at a significance of 6.5 σ, during its observations from 1993 June 28 to July 12. The source was seen again in the following 2 week viewing period and was weakly evident in the earlier phase 1 of the EGRET observations. Considering the variability of its gammaray flux, and its location at high Galactic latitude, GRO J0744+54 is likely to be a previously undetected blazar. Its most likely identification is with the radio source 87GB 073840.5+545138. A second source, GRO J0957+65, was seen by EGRET during the same two viewing periods at a combined significance of 5.7 σ. The most probable counterpart of GRO J0957+65 is the BL Lacertae object 0954+658. The spectra, time variability, and positions of the two sources are presented. Multiwavelength observations of 0954+658 are also presented.

AB - EGRET detected an unidentified source, GRO J0744+54, at a significance of 6.5 σ, during its observations from 1993 June 28 to July 12. The source was seen again in the following 2 week viewing period and was weakly evident in the earlier phase 1 of the EGRET observations. Considering the variability of its gammaray flux, and its location at high Galactic latitude, GRO J0744+54 is likely to be a previously undetected blazar. Its most likely identification is with the radio source 87GB 073840.5+545138. A second source, GRO J0957+65, was seen by EGRET during the same two viewing periods at a combined significance of 5.7 σ. The most probable counterpart of GRO J0957+65 is the BL Lacertae object 0954+658. The spectra, time variability, and positions of the two sources are presented. Multiwavelength observations of 0954+658 are also presented.

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U2 - 10.1086/175685

DO - 10.1086/175685

M3 - Article

AN - SCOPUS:11944259979

SN - 0004-637X

VL - 445

SP - 189

EP - 195

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

Egret gamma-ray sources: GRO J0744+54 and GRO J0957+65 (=BL Lacertae object 0954+658)

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