Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28082 results found.

  1. SGR1900+14, BeppoSAX-GRBM observations
  2. GRB970508 optical observations
  3. GRB971214, association with a Galactic star?
  4. GRB980519, Optical Observations
  5. GRB980703 - BeppoSAX/GRBM detection
  6. GRB980703 optical photometry
  7. GRB 980703: BATSE Observations
  8. GRB980703 optical observations
  9. GRB980703: Radio transient
  10. GRB 980703: Spectrum of the proposed optical counterpart
  11. GRB980703 Transient Optical Follow-Up
  12. GRB980703: LOTIS observation at early times
  13. GRB980613 Optical Observations
  14. GRB980703 (I band observations)
  15. BeppoSAX NFI observations of GRB 980703
  16. GRB980519 observation report
  17. GRB980703 optical followup
  18. Radio observations of SGRs
  19. SGR1900+14 field optical observations
  20. GRB980613, optical observations
  21. GRB 980613: Optical transient and its host galaxy
  22. SGR1627-41, RXTE/ASM observations
  23. GRB 980613: Detection of the probable host galaxy
  24. Reduced error box of SGR 1627-41
  25. GRB 980613: BATSE Observations
  26. GRB 980613 Optical Observations
  27. GRB 980613 optical observations
  28. Discovery of a new SGR source, SGR1627-41
  29. GRB980613 Optical Observations
  30. GRB980613 observations from Palomar
  31. GRB 980613 optical/IR obs.
  32. GRB980613 Near Infra-Red Observations
  33. GRB971214 Secondary Standards
  34. GRB980519 Secondary Standards
  35. BATSE on-board GRB trigger change
  36. GRB 980519 Optical Observations
  37. GRB 980519
  38. GRB980519 optical observations
  39. GRB 980519 Optical Observations
  40. GRB980519 BATSE Observations
  41. GRB980519 Optical Observations
  42. GRB980519 Optical Observations
  43. GRB 980519 Optical Observations
  44. GRB980515, BeppoSAX IAUC to be submitted
  45. BSAX Observations of GRB980425 field
  46. IPN web site of GRBs
  47. GRB980425 BATSE observations
  48. SAX J0840.7+2248 Optical Observations
  49. GRB980425: optical obs.
  50. GRB980425: Radio Observations
  51. report on BSAX observations of GRB980425
  52. GRB 980329 ROSAT observation
  53. GRB980326 X-ray Observations
  54. GRB980326, optical observations
  55. GRB980326, optical observations
  56. GRB980329, Fading IR counterpart to radio source
  57. GRB980329 Keck K-band observations
  58. GRB980329 sub-millimeter observations
  59. GRB980329 optical observations
  60. GRB980329 near-IR observations
  61. GRB980329 near-IR observations
  62. GRB980326 optical observations
  63. GRB980329 optical observations
  64. GRB980329 VLA observations
  65. GRB980329 optical observations
  66. GRB980329 optical observations
  67. GRB980326 optical observations
  68. GRB980326 optical observations
  69. Optical Observations of GRB 970508
  70. Near-IR follow-up on GRB 971227
  71. Optical Observations of the GRB 971227 field
  72. Optical Observations on GRB 971227
  73. GRB971227: Plaskett R-band observations
  74. GRB 971227: Optical clarifications
  75. GRB971227: Further CAHA R-band images
  76. GRB971227: LOTIS observations
  77. GRB971214: Optical Observations and Calibrations
  78. GRB 971214: Optical Observations
  79. Radio Observations of GRB 971214 at the VLA
  80. GRB 971024: Refined analysis by USNOFS Observations
  81. GRB 971024: KPNO Optical Observations
  82. GRB 970828: Palomar Observations

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov