LAT Pulsar Ephemerides
Pulsar Timing Database
Epoch folding pulsars with the Fermi Science Tools (e.g. using gtpphase and gtpsearch) requires use of a pulsar ephemeris database in the D4 FITS format (based on the EGRET pulsar analysis). It is prudent to use the timing models provided for analysis only within the validity range specified within the file. The accuracy of the models may degrade rapidly outside that range, particularly for noisy pulsars. A single D4 FITS file containing timing information for the LAT pulsars to date is available here:
- Fermi_PulsarDB_v001.fits (Posted 2009 Aug 24)
Additional timing models associated with various Fermi publications are available below.
NOTE: THE PULSAR EPHEMERIDES IN THE FSSC DATABASE ARE PROVIDED AS A COURTESY BY THE ORIGINAL OBSERVERS. USERS ARE STRONGLY ENCOURAGED TO CONTACT THE TIMING OBSERVERS FOR THE MOST CURRENT INFORMATION ABOUT ANY PULSAR.
Pulsar Timing Models for LAT Publications
The following table includes pulsar timing files used in publications of Fermi pulsars. The publication reference is given after the file listing. The radio template is provided when available.
Some pulsars have enough timing noise that phases for gamma rays can be better calculated by a more detailed timing model than is available in the D4 timing database. For such pulsars, analysis using the TEMPO or TEMPO2 radio timing systems is a better choice. An interface to these packages is under development. The TEMPO and TEMPO2 timing solutions are included in the table as .par files. For each pulsar, the preferred timing file is noted in the table in bold.
The rotation parameters are available in two file formats:
- In a "D4 FITS" file, to be read by the Fermi LAT Science Tools, as discussed in Smith, Guillemot et al A&A 492, 923 (2008) (arXiv: 0810.1637) and detailed in the FSSC documentation .
- In TEMPO and TEMPO2 ".par" files.
TEMPO is described at http://www.atnf.csiro.au/research/pulsar/tempo/ .
TEMPO2 is described at http://www.atnf.csiro.au/research/pulsar/tempo2/ .
The .par files are described at http://www.atnf.csiro.au/research/pulsar/tempo2/index.php?n=Documentation.Parameters .
When using these timing solutions in a publication, please refer to the following reference(s), depending on the radio instrument(s) used to obtain them (given in the table below):
- GBT: details are given for each pulsar in the "Publication Reference" listed below
- Parkes: R.N. Manchester, AIP Conf. Ser. 983, 584 (2008)
- Jodrell Bank: G. Hobbs, A.G. Lyne, M. Kramer, C.E. Martin, C. Jordan, MNRAS 353, 1311 (2004)
- Nançay: G. Theureau, N. Coudreau, N. Hallet, M. Hanski, L. Alsac, et al., A&A 430, 373 (2005)
- Arecibo: A. Dowd, W. Sisk, J. Hagen, ASC Conf. Ser. 202, 275 (2000)
- Westerbork: J.L.L. Voûte, M.L.A. Kouwenhoven, P.C. van Haren, J.J. Langerak, B.W. Stappers, et al., A&A 385, 733 (2002)
Table of Published Ephemerides
| Pulsar Name | Timing Files | Radio Instrument |
Timing Model Contact |
Publication Reference | Contact Author(s) |
|---|---|---|---|---|---|
| J0030+0451 | D4 .par tempo radioprofile |
Nançay | Ismael Cognard | "Pulsed Gamma-rays from the millisecond pulsar J0030+0451 with Fermi" Abdo, A. A. et al, ApJ, 2009, 699, 1171. arXiv:0904.4377 |
Lucas Guillemot Tyrel Johnson Matthew Kerr |
| J0205+6449 | D4 .par tempo radioprofile |
GBT | Fernando Camilo | "Discovery of Pulsations from the Pulsar J0205+6449 with the Fermi Gamma-ray Space Telescope" Abdo et al, ApJL, 2009 699, L102. arXiv:0906.1217 |
Damien Parent |
| Vela (B0833-45) (J0835-4510) |
D4 .par tempo2 radioprofile |
Parkes | Simon Johnston | " Fermi LAT Observations of the Vela Pulsar" Abdo, A. A. et al. 2009, ApJ, 696, 1084. arXiv:0812.2960 |
Roger Romani Massimiliano Razzano |
| J1028-5819 | D4 .par tempo2 radioprofile |
Parkes | Simon Johnston | "Discovery of Pulsed Gamma Rays from the Young Radio Pulsar PSR J1028-5819 with the Fermi Large Area Telescope" Abdo, A. A. et al. 2009, ApJL, 695, L72. arXiv:0903.1602 |
Alice Harding Tyrel Johnson |
| J2021+3651 | D4 .par tempo radioprofile |
GBT | Fernando Camilo | "Pulsed gamma-rays from PSR J2021+3651 with the Fermi Large Area Telescope" Abdo, A. A. et al, ApJ, 2009, 700, 1059. arXiv:0905.4400 |
Lucas Guillemot David Smith Matthew Kerr |
| J0007+7303 J0357+32 J0633+0632 J1418-6058 J1459-60 J1732-31 J1741-2054 J1809-2332 J1813-1246 J1826-1256 J1836+5925 J1907+06 J1958+2846 J2021+4026 J2032+4127 J2238+59 |
D4 .par tempo2 |
none | Paul Ray | "Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT" Abdo, A. A. et al, Science, 2009, 325, 840. DOI:10.1126/science.1175558 |
Michael Dormody Paul Ray Pablo Saz Parkinson Marcus Ziegler |
| J0030+0451 J0218+4232 J0437-4715 J0613-0200 J0751+1807 J1614-2230 J1744-1134 J2124-3358 |
.par tempo2 radioprofile .par tempo2 radioprofile .par tempo2 radioprofile .par tempo2 radioprofile .par tempo2 radioprofile .par tempo2 radioprofile .par tempo2 radioprofile .par tempo2 radioprofile .tgz |
Nançay Nançay & Westerbork Parkes Nançay Nançay GBT Nançay Nançay |
Ismael Cognard Ismael Cognard Ben Stappers Simon Johnston Ismael Cognard Ismael Cognard Fernando Camilo Ismael Cognard Ismael Cognard |
"{A Population of Gamma-Ray Millisecond Pulsars Seen with the Fermi Large Area Telescope" Abdo, A. A. et al, Science, 2009, 325, 848. 10.1126/science.1176113 |
Lucas Guillemot Tyrel Johnson Matthew Kerr David Smith |
Note: When using links in the table to send mail to contact authors or to radio contacts, please replace "at" with "@" and "dot" with "." in the email address before sending.