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"

27400 results found.

  1. HETE Trigger #1760 (GRB 010920B?): a new optical source
  2. HETE Trigger #1759 (GRB 010920?) optical observations
  3. BeppoSAX/GRBM detection of GRB 010801
  4. GCN and HETE status
  5. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  6. GRB 010629 Optical Observations
  7. IPN triangulation of GRB010613
  8. IPN triangulation of GRB010612
  9. GRB010518: a faint BeppoSAX detection
  10. GRB010324: BeppoSAX/GRBM data
  11. GRB 010214: X-Ray afterglow
  12. GRB010213, optical observations
  13. GRB010126: CONCAM crude optical limits during GRB
  14. HETE positions added to GCN
  15. CONCAM null result on GRB001005
  16. CONCAM crude optical limits before and after GRB000926
  17. GRB000607, optical observations
  18. GRB 000615: NIR observations
  19. IPN triangulation of GRB000519
  20. RXTE/ASM and IPN localization of GRB 000508B
  21. BeppoSAX GRB000424
  22. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  23. GRB000408, lotis optical observations
  24. GRB 000313 - optical transient in the BATSE error box
  25. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  26. BATSE GRB trigger criterion changed
  27. GRB000210 X-ray afterglow
  28. GRB 000210: BATSE Observations
  29. GRB000201 Optical Observations
  30. GRB 000201: TAROT optical observations
  31. BATSE GRB trigger criteria changed
  32. BATSE+IPN location of GRB000131
  33. BATSE location of GRB000126
  34. BATSE Observations of GRB000115
  35. Second RXTE Observation of GRB 000115
  36. Single IPN error box for GRB991229
  37. GRB 991216: Updated BATSE parameters
  38. GRB 991216--Summary of RXTE Observations
  39. GRB 991216: Extremely bright BATSE burst
  40. GRB991106: BeppoSAX/BATSE results
  41. BeppoSAX NFI Observation of GRB991106
  42. GRB 991105: BATSE Observations
  43. GRB991106, optical observation at SAO-RAS
  44. GRB 991106, LOTIS Optical Observations
  45. GRB991105: SAX-GRBM/-WFC detection
  46. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  47. GRB ALERT: GRB991105
  48. GRB 991014 - BeppoSAX NFI observations
  49. GRB991014 BATSE Observations
  50. Super-LOTIS optical observation of GRB991014
  51. BeppoSAX ALERT: GRB991014
  52. GRB 990915 optical observations
  53. BATSE GRB trigger criteria
  54. IPN error box for GRB990915 (=BATSE 7766)
  55. IPN localization of BATSE #7766 (GRB990915)
  56. GRB990806: BATSE Observations
  57. BeppoSAX ALERT GRB990806: Summer GRB
  58. BeppoSAX NFI Observation of GRB990705
  59. BeppoSAX NFI Observation of GRB990705
  60. GRB990704
  61. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  62. BeppoSAX: GRB990625
  63. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  64. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  65. BeppoSAX: A new fast X-ray transient
  66. GRB990510: X-ray afterglow
  67. GRB 990510: BATSE Observations
  68. GRB 990506: BATSE Observations
  69. GRB990323 PRECISE IPN POSITION
  70. GRB990316: simultaneous optical observation
  71. GRB990316 - Optical null results
  72. ASM/IPN error box for GRB 990308 (BATSE #7457)
  73. GRB 990308a and GRB 990308b
  74. BATSE Resumes Normal Operations
  75. Search for Potential Images of GRB 990123
  76. Search for Potential Images of GRB 990123
  77. GRB990123, OSSE observations
  78. GRB 990123: Strong MeV CGRO-COMPTEL detection now posted on WWW
  79. GRB 990123: BATSE Observations
  80. GRB990123, early optical counterpart detection
  81. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  82. Possible identification of SN1999E with GRB980910
  83. GRB 980923 BATSE Observations
  84. GRB980703 - BeppoSAX/GRBM detection
  85. GRB 980703: BATSE Observations
  86. RXTE Observation of GRB 980706
  87. GRB980703: LOTIS observation at early times
  88. GRB 980703: ASM Position & Intensity
  89. GRB 980613: BATSE Observations
  90. SGR1627-41, BeppoSAX-GRBM detections
  91. Discovery of a new SGR source, SGR1627-41
  92. BATSE on-board GRB trigger change
  93. GRB980519 BATSE Observations
  94. BATSE on-board GRB trigger change
  95. GRB980519, BeppoSAX-WFC updated position
  96. GRB980519, BeppoSAX-WFC position
  97. GRB980425 BATSE observations
  98. GRB 971024: Refined analysis by USNOFS Observations
  99. GRB 971024: USNO Observations
  100. GRB 970925: BATSE Localization

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