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"

11523 results found.

  1. GRB 090330: Fermi GBM detection
  2. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  3. GRB 090328: Gemini South Redshift
  4. GRB 090328: Swift XRT refined analysis
  5. Konus-Wind observation of GRB 090328
  6. GRB 090328: IPN Triangulation
  7. GRB 090328: Swift UVOT observations
  8. Fermi LAT and GBM detections of GRB090328
  9. GRB 090323: Radio afterglow detection
  10. GRB 090323: TLS detection at 5 days, no break
  11. GRB 090327: Fermi GBM detection
  12. GRB 090323: Faulkes Telescope South Observations
  13. GRB 090320B: MASTER-Net prompt optical observations
  14. GRB 090323: Fermi GBM Spectral Analysis
  15. GRB 090323 TLS detection - still bright
  16. GRB 090323: UVOT Detection of Afterglow
  17. GRB 090323: Swift-XRT refined analysis
  18. Konus-Wind observation of GRB 090323
  19. GRB 090323: GROND Detection of the Afterglow and Photo-z
  20. SGR J1550-5418: two Fermi GBM triggers on March 22
  21. GRB 090323: Possible XRT Counterpart
  22. IPN triangulation of GRB090323
  23. GRB 090320C: Fermi GBM Detection
  24. Fermi GBM and LAT detections of GRB 090323
  25. GRB 090320B: Fermi GBM detection.
  26. GRB 090319: Fermi GBM detection
  27. GRB 090320A: Fermi GBM detection
  28. GRB090305B: MASTER-net prompt optical short burst observations
  29. GRB090310: Fermi GBM detection
  30. GRB090305B: Fermi GBM detection
  31. GRB 090309B: Fermi GBM detection
  32. GRB 090308B: Fermi GBM detection
  33. GRB 090307B: Fermi GBM detection
  34. GRB 090306C: Fermi GBM detection
  35. Fermi GBM trigger 090305784 is not a GRB
  36. GRB 090303: Fermi GBM detection
  37. GRB 090304: Fermi GBM detection
  38. Konus-RF catches first GRB and SGR bursts
  39. GRB 090228B: Fermi GBM detection
  40. Konus-Wind observation of bright short GRB 090227B
  41. IPN localization of short bright GRB 090227B
  42. GRB 090301B: Fermi GBM detection
  43. GRB 090227B: Fermi GBM detection
  44. GRB 090228: Fermi GBM detection
  45. GRB 090227: Fermi GBM detection
  46. GRB 090206: Fermi GBM detection
  47. SGR J1550-5418
  48. Ongoing activity of AXP/SGR 1E1547.0-5408
  49. GRB 090222: Fermi GBM detection
  50. GRB 090219: Fermi GBM detection
  51. GRB 090217: Suzaku WAM observation of the prompt emission
  52. Konus-Wind observation of GRB 090217
  53. IPN localization of GRB 090217
  54. GRB 090213: Fermi GBM detection
  55. GRB090217: Fermi-LAT Detection
  56. GRB 090217: Fermi GBM detection
  57. SGR activity seen by BAT during ICSP Ionospheric Events
  58. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  59. GRB 090207 - Fermi GBM Observations
  60. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  61. GRB 090129: Fermi GBM detection
  62. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  63. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  64. GRB 090202: Fermi GBM detection
  65. GRB 090131: Fermi GBM detection
  66. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  67. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  68. GRB 090126C: Fermi GBM detection
  69. GRB 090126B: Fermi GBM detection
  70. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  71. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  72. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  73. AXP 1E1547.0-5408: Fermi GBM observations
  74. AXP 1E1547.0-5408 activity with SGR bursts
  75. GRB 090117B : Fermi GBM detection
  76. GRB 090117C - Fermi GRB Detection
  77. GRB 090117 - Fermi GBM Observations
  78. GRB 090112B: Fermi GBM Detection
  79. GRB 090113: Swift detection of a burst
  80. GRB 090112: Fermi GBM detection
  81. GRB 090109: Fermi GBM detection
  82. GRB 090108B: Fermi GBM detection
  83. GRB 090108: Fermi GBM Detection
  84. GRB090107B: Fermi GBM Detection
  85. Fermi/GBM detection of GRB 081226A
  86. Fermi/GBM detection of GRB 081225
  87. GRB 081231: Fermi GBM Detection
  88. GRB 081229: Fermi GBM detection
  89. GRB 081226B: Fermi GBM observation
  90. GRB 081226C: Fermi GBM detection
  91. GRB 081224: Suzaku WAM observation of the prompt emission
  92. GRB 081224: Swift-XRT observation
  93. GRB 081224: Fermi GBM Detection & LAT Localization
  94. GRB 081223: Fermi GBM detection
  95. GRB 081221: GROND observations
  96. GRB 081222: Fermi GBM observation
  97. Fermi Gamma-ray Burst Monitor trigger 251687595 reclassification
  98. GRB 081204C: Fermi GBM detection
  99. Konus-Wind observation of very bright GRB 081215A
  100. GRB081221: Fermi GBM observation

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