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"

23575 results found.

  1. GRB980703 optical observations
  2. GRB980703 H-band Observations
  3. GRB980703 Transient Optical Follow-Up
  4. GRB 980703
  5. GRB980703 (I band observations)
  6. GRB 980703 H-band Observations
  7. GRB980703 (optical R observations)
  8. GRB980703: radio source/optical transient
  9. BeppoSAX NFI observations of GRB 980703
  10. GRB 980703: ASM Position & Intensity
  11. GRB980519 observation report
  12. SGR1900+14 field optical observations
  13. GRB 980613 Near-IR observations
  14. GRB980613, optical observations
  15. SGR1627-41, RXTE/ASM observations
  16. SGR1627-41, Refined IPN annulus location
  17. Reduced error box of SGR 1627-41
  18. GRB 980613: BATSE Observations
  19. SGR1627-41, BeppoSAX-GRBM detections
  20. GRB 980613 Optical Observations
  21. Discovery of a new SGR source, SGR1627-41
  22. GRB980613 observations from Palomar
  23. GRB 980613 new optical/IR observations
  24. GRB 980613 optical/IR obs.
  25. GRB980613 Near Infra-Red Observations
  26. GRB971214 Secondary Standards
  27. SGR 1900+14
  28. SGR1900+14
  29. SGR1900+14
  30. GRB980519 optical observations
  31. GRB980519 Optical Observations
  32. GRB980519 optical observations
  33. GRB980515, BeppoSAX IAUC to be submitted
  34. GRB 980425 Radio Light Curve
  35. GRB 980425 Brightness Temperature
  36. GRB980425 BATSE observations
  37. GRB980425: Radio Observations
  38. GRB 980425 optical observations
  39. report on BSAX observations of GRB980425
  40. GRB 980425 optical observations
  41. GRB980326, optical observations
  42. GRB980329, Fading IR counterpart to radio source
  43. GRByymmdd, Announcement of automation
  44. GRB980326 IPN annulus
  45. GRB980329
  46. GRB980329 IPN annulus
  47. GRB980329 optical observations
  48. GRB980329 near-IR observations
  49. GRB980329 near-IR observations
  50. GRB980329 optical observations
  51. GRB980329 infrared observations
  52. GRB980329 optical observations
  53. GRB980326 optical observations
  54. GRB980329 optical observations
  55. GRB980329 near IR observations
  56. GRB980329 optical observations
  57. GRB980329 optical observations
  58. GRB980329 optical observations
  59. GRB980326 optical observations
  60. GRB970508 SAO RAS optical observations
  61. Near-IR follow-up on GRB 971227
  62. GRB971227: Plaskett R-band observations
  63. GRB 971227: Optical clarifications
  64. GRB971227: Further CAHA R-band images
  65. GRB971227: LOTIS observations
  66. GRB 971227: CAHA R-band images
  67. GRB971214: Optical Observations and Calibrations
  68. GRB 971214: EUVE Observations
  69. GRB 971214: Redshift from Keck Optical Observations
  70. GRB 971214: Redshift from Keck Optical Observations
  71. Optical Observations of GRB 971214 at Keck
  72. GRB 971214: Optical Observations
  73. GRB 971024: Refined analysis by USNOFS Observations
  74. GRB 971024: USNO Observations
  75. IRAS 18119-1342 and the possible new SGR

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