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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"

11836 results found.

  1. GRB 090411B: Suzaku WAM observation of the prompt emission
  2. GRB 090411A: Suzaku WAM observation of the prompt emission
  3. GRB 090412: Fermi GBM detection
  4. GRB 090411B: Fermi GBM detection
  5. GRB 090411A: Fermi GBM detection
  6. Fermi GBM trigger 261106787 is not a GRB
  7. GRB 090409: Fermi GBM detection
  8. Fermi GBM Detection of a weak source
  9. GRB 090405: Fermi GBM Detection
  10. GRB 090403: Fermi GBM detection
  11. Fermi Gamma-ray Burst Monitor trigger 260428446 is not a GRB
  12. GRB 090328: Fermi-LAT refined analysis
  13. GRB 090331: Fermi GBM detection
  14. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  15. GRB 090323: Further TLS detections - a break?
  16. GRB 090328: Radio afterglow detection
  17. GRB 090326: Fermi GBM detection
  18. GRB 090328: BOOTES-3 optical observations
  19. GRB 090328: Fermi GBM Spectral Analysis
  20. GRB 090328B: Fermi GBM Detection
  21. GRB 090330: Fermi GBM detection
  22. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  23. GRB 090328: Gemini South Redshift
  24. GRB 090328: Swift XRT refined analysis
  25. Konus-Wind observation of GRB 090328
  26. GRB 090328: IPN Triangulation
  27. GRB 090328: Swift UVOT observations
  28. Fermi LAT and GBM detections of GRB090328
  29. GRB 090323: Radio afterglow detection
  30. GRB 090323: TLS detection at 5 days, no break
  31. GRB 090327: Fermi GBM detection
  32. GRB 090323: Faulkes Telescope South Observations
  33. GRB 090320B: MASTER-Net prompt optical observations
  34. GRB 090323: Fermi GBM Spectral Analysis
  35. GRB 090323 TLS detection - still bright
  36. GRB 090323: UVOT Detection of Afterglow
  37. GRB 090323: Swift-XRT refined analysis
  38. Konus-Wind observation of GRB 090323
  39. GRB 090323: GROND Detection of the Afterglow and Photo-z
  40. SGR J1550-5418: two Fermi GBM triggers on March 22
  41. GRB 090323: Possible XRT Counterpart
  42. IPN triangulation of GRB090323
  43. GRB 090320C: Fermi GBM Detection
  44. Fermi GBM and LAT detections of GRB 090323
  45. GRB 090320B: Fermi GBM detection.
  46. GRB 090319: Fermi GBM detection
  47. GRB 090320A: Fermi GBM detection
  48. GRB090305B: MASTER-net prompt optical short burst observations
  49. GRB090310: Fermi GBM detection
  50. GRB090305B: Fermi GBM detection
  51. GRB 090309B: Fermi GBM detection
  52. GRB 090308B: Fermi GBM detection
  53. GRB 090307B: Fermi GBM detection
  54. GRB 090306C: Fermi GBM detection
  55. Fermi GBM trigger 090305784 is not a GRB
  56. GRB 090303: Fermi GBM detection
  57. GRB 090304: Fermi GBM detection
  58. Konus-RF catches first GRB and SGR bursts
  59. GRB 090228B: Fermi GBM detection
  60. Konus-Wind observation of bright short GRB 090227B
  61. IPN localization of short bright GRB 090227B
  62. GRB 090301B: Fermi GBM detection
  63. GRB 090227B: Fermi GBM detection
  64. GRB 090228: Fermi GBM detection
  65. GRB 090227: Fermi GBM detection
  66. GRB 090206: Fermi GBM detection
  67. SGR J1550-5418
  68. Ongoing activity of AXP/SGR 1E1547.0-5408
  69. GRB 090222: Fermi GBM detection
  70. GRB 090219: Fermi GBM detection
  71. GRB 090217: Suzaku WAM observation of the prompt emission
  72. Konus-Wind observation of GRB 090217
  73. IPN localization of GRB 090217
  74. GRB 090213: Fermi GBM detection
  75. GRB090217: Fermi-LAT Detection
  76. GRB 090217: Fermi GBM detection
  77. SGR activity seen by BAT during ICSP Ionospheric Events
  78. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  79. GRB 090207 - Fermi GBM Observations
  80. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  81. GRB 090129: Fermi GBM detection
  82. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  83. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  84. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  85. GRB 090202: Fermi GBM detection
  86. GRB 090131: Fermi GBM detection
  87. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  88. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  89. GRB 090126C: Fermi GBM detection
  90. GRB 090126B: Fermi GBM detection
  91. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  92. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  93. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  94. AXP 1E1547.0-5408: Fermi GBM observations
  95. AXP 1E1547.0-5408 activity with SGR bursts
  96. GRB 090117B : Fermi GBM detection
  97. GRB 090117C - Fermi GRB Detection
  98. GRB 090117 - Fermi GBM Observations
  99. GRB 090112B: Fermi GBM Detection
  100. GRB 090113: Swift detection of a burst

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