Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

11111 results found.

  1. IPN triangulation of GRB 130310A
  2. GRB 130310A: Fermi GBM detection
  3. GRB 130310A: Fermi-LAT detection and localization
  4. IPN triangulation of GRB 130228A
  5. Konus-Wind observation of GRB 130306A
  6. GRB 130307A: Fermi GBM detection
  7. GRB 130306A: Fermi GBM observation
  8. GRB 130306A: MASTER-Net pre-Swift alert observation
  9. GRB 130306A: Swift detection of a burst
  10. GRB 130305A: P60 Observations
  11. GRB 130305A: Swift/XRT detection of the afterglow
  12. Konus-Wind observation of GRB 130305A
  13. GRB 130305A: Fermi GBM observation
  14. GRB 130305A: Fermi LAT Detection
  15. Fermi GBM trigger 130301.638 is not GRB
  16. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  17. GRB 130305A found in ground analysis of Swift/BAT data
  18. Konus-Wind observation of GRB 130219A
  19. IPN Triangulation of GRB 130219A
  20. GRB 130219A: Fermi GBM detection
  21. GRB 130216B: MASTER-Net early observation
  22. GRB 130216A: MASTER-Net early observations
  23. GRB 130216A: Fermi GBM observation
  24. GRB 130216B: Fermi GBM observation
  25. GRB 130216B: Burst found in ground analysis of BAT data
  26. GRB 130215A: Fermi GBM detection
  27. GRB 130215A: ROTSE-III data analysis
  28. GRB 130206A: Fermi LAT Observations
  29. GRB 130206A: Fermi GBM observation
  30. GRB 130127A: Fermi GBM detection
  31. Konus-Wind observation of GRB 121225B
  32. IPN Triangulation of GRB 121225B
  33. GRB 121225B: Fermi GBM observation
  34. GRB 121225B: Fermi LAT Detection
  35. GRB 121217A: Fermi GBM observation
  36. GRB 121211A: Fermi GBM observation
  37. GRB 121202A: Fermi GBM observation
  38. IPN Triangulation of GRB 121127A (short/hard)
  39. GRB 121122A: Fermi GBM observation
  40. GRB 121128A: Fermi GBM observation
  41. IPN Triangulation of GRB 121122A (long/intense)
  42. GRB 121125A: Fermi GBM Observation
  43. GRB 121123A: GROND observations
  44. GRB 121123A: Fermi GBM observation
  45. IPN Triangulation of GRB 121118A
  46. Fermi GBM trigger 121115.186 is not a GRB
  47. GRB 121031A: Fermi GBM detection
  48. GRB 121029A Suzaku WAM observation of the prompt emission
  49. GRB 121029A: Fermi GBM detection
  50. GRB 121011A Suzaku WAM observation of the prompt emission
  51. GRB 121012A: Fermi GBM detection
  52. GRB 121011A: NOT redshift retraction
  53. GRB 121011A: Fermi GBM observation
  54. GRB 121011A: Fermi-LAT detection of a burst
  55. Further Swift-XRT observations of the GRB 120919A field.
  56. GRB 120921A: Fermi GBM detection of its 1000th GRB
  57. GRB 120916A Suzaku WAM observation of the prompt emission
  58. GRB 120922A: Fermi GBM detection
  59. GRB 120919B: MASTER prompt optical observations
  60. GRB 120919A: Swift-XRT observations
  61. IPN Triangulation of long GRB 120919B
  62. Konus-Wind observation of GRB 120919A
  63. IPN Triangulation of long GRB 120919A
  64. GRB 120919A: Fermi GBM detection
  65. GRB 120916A: Fermi GBM Observation
  66. Konus-Wind observation of GRB 120916A
  67. IPN Triangulation of long GRB 120916A
  68. GRB 120916A: Fermi-LAT detection of a burst
  69. Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A
  70. GRB 120913B: Fermi GBM observation
  71. GRB 120913A: Fermi GBM observation
  72. Konus-Wind observation of GRB 120911B
  73. GRB 120911B: Fermi GBM observation
  74. GRB 120911B: Fermi-LAT detection of a burst
  75. GRB 120911A: Fermi GBM observation
  76. GRB 120911A: Fermi/LAT upper limit
  77. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  78. GRB 120908A: Fermi GBM detection
  79. GRB 120909A: Fermi GBM observation
  80. GRB 120907A: Fermi GBM detection
  81. GRB 120830A: Further Swift Observations
  82. GRB 120830A: Swift-XRT and UVOT observations
  83. GRB 120830A: Fermi GBM observation
  84. Konus-Wind observation of GRB 120830A
  85. GRB 120830A: early MASTER optical limit
  86. IPN Triangulation of short GRB 120830A
  87. GRB 120830A: Fermi-LAT detection of a short burst
  88. Fermi trigger 368003226 : MASTER optical observations
  89. Konus-Wind observation of GRB 120817B
  90. GRB 120817B: Fermi GBM detection
  91. IPN Triangulation of GRB 120817B (short/very intense)
  92. GRB 120811B: Fermi GBM observation
  93. GCN for GRB 120811C
  94. Improved IPN error box for short hard GRB 120811B
  95. IPN Triangulation of short hard GRB 120811B
  96. GRB 120807A: Fermi/LAT upper limit
  97. Fermi/GBM detection of an SGR-like burst
  98. GRB 120728A: Fermi GBM observation
  99. GRB 120729A: Fermi GBM observation
  100. GRB 120728B: Fermi GBM detection

Advanced

Download all Circulars as a .tar.gz archive:
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