Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32682 results found.

  1. GRB980703: LOTIS observation at early times
  2. GRB980613 Optical Observations
  3. GRB 980703
  4. GRB980703 (I band observations)
  5. GRB 980703 H-band Observations
  6. GRB980703: radio source/optical transient
  7. BeppoSAX NFI observations of GRB 980703
  8. GRB980519 observation report
  9. Radio observations of SGRs
  10. GRB 980613 Near-IR observations
  11. GRB980613, optical observations
  12. GRB 980613: Optical transient and its host galaxy
  13. SGR1627-41, RXTE/ASM observations
  14. SGR1627-41, Refined IPN annulus location
  15. GRB 980613: Detection of the probable host galaxy
  16. Reduced error box of SGR 1627-41
  17. SGR1627-41, BeppoSAX-GRBM detections
  18. GRB 980613 Optical Observations
  19. GRB 980613 optical observations
  20. GRB980613 Optical Observations
  21. GRB980613 observations from Palomar
  22. GRB 980613 new optical/IR observations
  23. GRB971214 Secondary Standards
  24. GRB980519 Secondary Standards
  25. SGR1900+14
  26. GRB 980519 Optical Observations
  27. GRB980519 optical observations
  28. GRB980519 I-band observations
  29. GRB 980519
  30. GRB980519 optical observations
  31. GRB 980519 Optical Observations
  32. GRB980519 BATSE Observations
  33. GRB970519, optical follow-up at Schmidt Calern
  34. GRB980519 optical observations
  35. GRB980519 Optical Observations
  36. GRB980519 Optical Observations
  37. GRB980519 IPN POSITION
  38. GRB980519 Optical Observations
  39. GRB 980519 Optical Observations
  40. GRB980519 optical observations
  41. GRB980515, BeppoSAX IAUC to be submitted
  42. GRB980519, BeppoSAX-WFC updated position
  43. GRB 980425 Radio Light Curve
  44. GRB 980425 Brightness Temperature
  45. BSAX Observations of GRB980425 field
  46. IPN web site of GRBs
  47. GRB980425 BATSE observations
  48. SAX J0840.7+2248 Optical Observations
  49. GRB 980425 optical observations
  50. GRB980425: optical obs.
  51. GRB980425: Radio Observations
  52. GRB 980425 optical observations
  53. GRB980326, optical observations
  54. GRB980326, optical observations
  55. GRB980329, Fading IR counterpart to radio source
  56. GRByymmdd, Announcement of automation
  57. GRB980326 IPN annulus
  58. GRB980329
  59. GRB980329 Keck K-band observations
  60. GRB980329 sub-millimeter observations
  61. GRB980329 IPN annulus
  62. GRB980329 optical observations
  63. GRB980329 near-IR observations
  64. GRB980329 optical observations
  65. GRB980326 optical observations
  66. GRB980326 optical observations
  67. GRB970508 SAO RAS optical observations
  68. GRB 971214: Redshift from Keck Observations
  69. Near-IR follow-up on GRB 971227
  70. GRB971214: Keck R & I-band Observations
  71. GRB 971227: Optical Observations
  72. Optical Observations of the GRB 971227 field
  73. GRB971227: Plaskett R-band observations
  74. GRB 971227: Optical clarifications
  75. GRB971227: LOTIS observations
  76. GRB971214: Optical Observations and Calibrations
  77. Optical Observations of GRB 971214 at Keck
  78. GRB 971024: Refined analysis by USNOFS Observations
  79. GRB 971024: USNO Observations
  80. GRB 970925: BATSE Localization
  81. IRAS 18119-1342 and the possible new SGR
  82. GRB 970228: Keck/LRIS Optical 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