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HEASARC

NASA's designated multi-mission astronomy archive for cosmic astronomy datasets for observations in the extreme ultraviolet (EUV), X-ray, and gamma-ray wave bands, as well as for cosmic microwave background (CMB) datasets.

LAMBDA

LAMBDA is a multi-mission NASA center of expertise for cosmic microwave background (CMB) radiation research; it provides CMB researchers with archive data from cosmology missions, software tools, and links to other sites of interest.
Query the HEASARC database. Example queries.

Xamin Search Help

  • What ROSAT tables have information on 3c273:
    '3c 273' rosat or 3c273 rosat
  • Find long Chandra exposures:
    chanmaster exposure>10000 status='archived'
  • Tables of cataclysmic variables that include AM Her:
    'AM Her' cataclysmic
  • all of the long ROSAT observations of Messier objects in Scorpius:
    messier rosmaster a.constell='SCO' b.exposure>20000
More information and examples

Active Guest Observer Facilities/Science Centers

AstroSat
BurstCube
CALET
Chandra
Fermi
Integral
IXPE
MAXI
NICER
NuSTAR
PUEO
SRG eRosita /
ART-XC
Swift
TESS
XL-Calibur
XMM-Newton
XRISM
More ...
HEASARC Picture of the Week HEASARC Picture of the Week
See APOD at https://apod.nasa.gov/apod/astropix.html Astronomy Picture of the Day

  • Latest News

    • NuSTAR Cycle 12 Now Accepting Proposals (21 Dec 2025)
      The due date for NuSTAR Cycle 12 proposal submission is Jan 29, 2026. Proposals should be submitted via the HEASARC's ARK Remote Proposal System (RPS). For more information about this cycle, please visit the NuSTAR Proposal Guide Page.
    • NuSTAR Caldb Update (19 Dec 2025)
      The NuSTAR FPM caldb was updated to version 20251215. This release includes a new clock correction file, v219 using a new temperature model. Please see the release notes for more details.
    • Chandra CALDB 4.12.3 installed at the HEASARC (18 Dec 2025)
      The Chandra CalDB 4.12.3 is now installed in and available from the HEASARC CALDB. Chandra 4.12.3 was released by the CXC on December 16, 2025.
    • Fermitools 2.5.1 Released (18 Dec 2025)
      The latest version, 2.5.1, of the Fermi analysis software, Fermitools, was released on December 18, 2025
    • XRISM Cycle 3 call for GO proposals: (10 Dec 2025)
      The XRISM Cycle 3 call for GO proposals has been announced and is now open. The due date for XRISM Cycle 3 proposal submission is February 27th, 2026. See the Proposals and Tools webpage for more information.
    • NASA PostDoctoral Fellowship - Deadline Extended (8 Dec 2025)
      The NASA Postdoctoral Program (NPP) November 2025 cycle application deadline has been extended to Friday 19 December 2025 at 6p Eastern (3p Pacific). The NASA Postdoctoral Program offers US and international scientists the opportunity to advance their research while contributing to NASA's scientific goals. The NPP supports fundamental science; explores the undiscovered; promotes intellectual growth; and encourages scientific connections. Selected by a competitive peer-review process, NPP Fellows complete one- to three-year Fellowship appointments that advance NASA's missions in Earth science, planetary science, heliophysics, astrophysics, biological and physical science, aeronautics and engineering, human exploration systems, space operations, space technology, and astrobiology. Search for NPP research opportunities here: NPP Research Opportunities.
    More ...

  • Upcoming Deadlines

    • 12/19/2025: Step 1 (NOI) Deadline for Astrophysics Data Analysis Program
    • 01/22/2026: Step 1 (NOI) Deadline for Citizen Science Seed Funding Program
    • 01/23/2026: Step 1 (NOI) Deadline for Astrophysics Pioneers Proposal
    • 01/29/2026: Cycle 12 Deadline for NuSTAR General Investigator Proposal
    More ...

  • Upcoming Meetings

    • 33rd Texas Symposium on Relativistic Astrophysics: 2025 Dec 08 - 12
    • Coupling Radiative Transfer and Atomic Physics to Study r-Process Transients: 2026 Jan 12 - 16
    • 60th Rencontres de Moriond on Very High Energy Phenomena in the Universe: 2026 Mar 15 - 22
    • BlackHolistic 2026: black holes, accretion and jets across the mass spectrum: 2026 Mar 23 - 27
    More ...