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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"

11112 results found.

  1. GRB 090323: Faulkes Telescope South Observations
  2. GRB 090320B: MASTER-Net prompt optical observations
  3. GRB 090323: Fermi GBM Spectral Analysis
  4. GRB 090323 TLS detection - still bright
  5. GRB 090323: UVOT Detection of Afterglow
  6. GRB 090323: Swift-XRT refined analysis
  7. Konus-Wind observation of GRB 090323
  8. GRB 090323: GROND Detection of the Afterglow and Photo-z
  9. SGR J1550-5418: two Fermi GBM triggers on March 22
  10. GRB 090323: Possible XRT Counterpart
  11. IPN triangulation of GRB090323
  12. GRB 090320C: Fermi GBM Detection
  13. Fermi GBM and LAT detections of GRB 090323
  14. GRB 090320B: Fermi GBM detection.
  15. GRB 090319: Fermi GBM detection
  16. GRB 090320A: Fermi GBM detection
  17. GRB090305B: MASTER-net prompt optical short burst observations
  18. GRB090310: Fermi GBM detection
  19. GRB090305B: Fermi GBM detection
  20. GRB 090309B: Fermi GBM detection
  21. GRB 090308B: Fermi GBM detection
  22. GRB 090307B: Fermi GBM detection
  23. GRB 090306C: Fermi GBM detection
  24. Fermi GBM trigger 090305784 is not a GRB
  25. GRB 090303: Fermi GBM detection
  26. GRB 090304: Fermi GBM detection
  27. Konus-RF catches first GRB and SGR bursts
  28. GRB 090228B: Fermi GBM detection
  29. Konus-Wind observation of bright short GRB 090227B
  30. IPN localization of short bright GRB 090227B
  31. GRB 090301B: Fermi GBM detection
  32. GRB 090227B: Fermi GBM detection
  33. GRB 090228: Fermi GBM detection
  34. GRB 090227: Fermi GBM detection
  35. GRB 090206: Fermi GBM detection
  36. SGR J1550-5418
  37. Ongoing activity of AXP/SGR 1E1547.0-5408
  38. GRB 090222: Fermi GBM detection
  39. GRB 090219: Fermi GBM detection
  40. GRB 090217: Suzaku WAM observation of the prompt emission
  41. Konus-Wind observation of GRB 090217
  42. IPN localization of GRB 090217
  43. GRB 090213: Fermi GBM detection
  44. GRB090217: Fermi-LAT Detection
  45. GRB 090217: Fermi GBM detection
  46. SGR activity seen by BAT during ICSP Ionospheric Events
  47. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  48. GRB 090207 - Fermi GBM Observations
  49. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  50. GRB 090129: Fermi GBM detection
  51. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  52. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  53. GRB 090202: Fermi GBM detection
  54. GRB 090131: Fermi GBM detection
  55. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  56. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  57. GRB 090126C: Fermi GBM detection
  58. GRB 090126B: Fermi GBM detection
  59. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  60. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  61. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  62. AXP 1E1547.0-5408: Fermi GBM observations
  63. AXP 1E1547.0-5408 activity with SGR bursts
  64. GRB 090117B : Fermi GBM detection
  65. GRB 090117C - Fermi GRB Detection
  66. GRB 090117 - Fermi GBM Observations
  67. GRB 090112B: Fermi GBM Detection
  68. GRB 090113: Swift detection of a burst
  69. GRB 090112: Fermi GBM detection
  70. GRB 090109: Fermi GBM detection
  71. GRB 090108B: Fermi GBM detection
  72. GRB 090108: Fermi GBM Detection
  73. GRB090107B: Fermi GBM Detection
  74. Fermi/GBM detection of GRB 081226A
  75. Fermi/GBM detection of GRB 081225
  76. GRB 081231: Fermi GBM Detection
  77. GRB 081229: Fermi GBM detection
  78. GRB 081226B: Fermi GBM observation
  79. GRB 081226C: Fermi GBM detection
  80. GRB 081224: Suzaku WAM observation of the prompt emission
  81. GRB 081224: Swift-XRT observation
  82. GRB 081224: Fermi GBM Detection & LAT Localization
  83. GRB 081223: Fermi GBM detection
  84. GRB 081221: GROND observations
  85. GRB 081222: Fermi GBM observation
  86. Fermi Gamma-ray Burst Monitor trigger 251687595 reclassification
  87. GRB 081204C: Fermi GBM detection
  88. Konus-Wind observation of very bright GRB 081215A
  89. GRB081221: Fermi GBM observation
  90. IPN triangulation of bright GRB 081215A
  91. GRB 081222: Swift detection of a burst with a bright optical afterglow
  92. GRB 081221: Swift detection of a burst
  93. GRB 081217: Fermi GBM detection
  94. GRB081215A: Fermi-LAT observations
  95. GRB 081215B: Fermi GBM detection
  96. GRB 081216: Suzaku WAM observation of the prompt emission
  97. GRB 081216 : Fermi GBM observation
  98. GRB 081215A: Fermi GBM detection (correction to event fluence)
  99. GRB 081215A: Fermi GBM detection
  100. IPN localization of short hard GRB 081216

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