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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"

35948 results found.

  1. GRB090305B: Fermi GBM detection
  2. GRB 090309B: Fermi GBM detection
  3. GRB 090309: Swift-XRT refined analysis
  4. GRB 090309: Enhanced Swift-XRT position
  5. GRB 090306B: INTEGRAL SPI-ACS light curve
  6. GRB 090309, Swift-BAT refined analysis
  7. GRB 090308: GROND observations
  8. GRB 090308: Gemini GMOS Observations
  9. GRB 090309: Swift detection of a burst
  10. GRB 090308B: Fermi GBM detection
  11. GRB 090308: Swift/UVOT Upper Limits
  12. GRB 090307B: Fermi GBM detection
  13. GRB 090306C: Fermi GBM detection
  14. GRB 090307: GROND Upper Limits
  15. GRB 090306B: GROND Upper Limits
  16. GRB 090305C: Suzaku WAM observation of the prompt emission
  17. GRB 090308: Swift-XRT refined analysis
  18. Radio observation of GRB 090201 with ATCA
  19. Radio observation of GRB 090117 with ATCA
  20. Radio observation of GRB 081226b with ATCA
  21. Radio observation of GRB 081226a with ATCA
  22. Radio observation of GRB 081007 with ATCA
  23. GRB 090308: Swift-BAT refined analysis
  24. GRB 090308: Swift detection of a burst
  25. GRB 090306B: Possible XRT afterglow
  26. GRB 090307: Swift-XRT afterglow confirmation and analysis
  27. GRB 090307: Swift-BAT refined analysis of trigger 345551
  28. GRB 090306B: Burst detection from Swift-BAT slew data
  29. Swift Trigger 345551 is probably not a GRB
  30. Swift-BAT trigger 345396 is not a GRB
  31. IPN localization of short GRB 090305C
  32. Fermi GBM trigger 090305784 is not a GRB
  33. GRB 090306: Swift detection of a possible burst
  34. GRB 090305: Swift/UVOT Upper Limits
  35. GRB 090305: Swift-XRT refined analysis
  36. GRB 090305, Swift-BAT refined analysis
  37. GRB 090227A: Suzaku WAM observation of the prompt emission
  38. GRB 090305: Magellan confirmation of the optical afterglow
  39. GRB090305: GMOS-S Candidate Optical Afterglow
  40. GRB 090305: Swift detection of a short burst
  41. GRB 090303: Fermi GBM detection
  42. GRB 090304: Fermi GBM detection
  43. GRB 090301A: Suzaku WAM observation of the prompt emission
  44. Konus-RF catches first GRB and SGR bursts
  45. GRB 090228B: Fermi GBM detection
  46. Konus-Wind observation of bright short GRB 090227B
  47. IPN localization of short bright GRB 090227B
  48. Konus-Wind observation of GRB 090301A
  49. GRB 090301A: Swift-BAT refined analysis
  50. GRB 090301B: Fermi GBM detection
  51. GRB 090227B: Fermi GBM detection
  52. GRB 090301: Swift detection of a burst
  53. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  54. GRB 090228: Fermi GBM detection
  55. GRB 090227: Fermi GBM detection
  56. GRB 090206: Fermi GBM detection
  57. GRB 081211B: Nearby cluster
  58. GRB 090222: Fermi GBM detection
  59. GRB 090219: Fermi GBM detection
  60. Swift Trigger 343319 is not a GRB
  61. GRB 090217: Suzaku WAM observation of the prompt emission
  62. GRB090217: XRT analysis
  63. Konus-Wind observation of GRB 090217
  64. IPN localization of GRB 090217
  65. GRB 090213: Fermi GBM detection
  66. GRB090217: Fermi-LAT Detection
  67. GRB 090217: Fermi GBM detection
  68. GRB 090207 - Fermi GBM Observations
  69. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  70. GRB 090129: Fermi GBM detection
  71. VLA radio upper limit on GRB 090205
  72. GRB 090205: VLT optical decay
  73. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  74. GRB 090205: Swift/UVOT Upper Limits
  75. GRB 090205: VLT refined redshift
  76. GRB 090205: Swift-XRT refined analysis
  77. GRB 090205: Swift burst of interest
  78. GRB 090205: VLT spectroscopic redshift
  79. GRB 090205: GROND observations and photometric redshift estimate
  80. GRB 090205: VLT candidate afterglow
  81. GRB 090205: Swift-BAT refined analysis
  82. GRB 090205: Enhanced Swift-XRT position
  83. GRB 090205: Swift detection of a burst
  84. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  85. GRB 090131: Suzaku WAM observation of the prompt emission
  86. GRB 090126A: Swift-XRT afterglow confirmation
  87. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  88. Konus-Wind observation of GRB 090201
  89. GRB 090202: Fermi GBM detection
  90. GRB 090131: Fermi GBM detection
  91. GRB 090201: Swift-XRT refined analysis
  92. GRB090201: Swift UVOT upper limits
  93. GRB 090201: object inside the enhanced XRT error circle
  94. GRB 090201: Enhanced Swift-XRT position
  95. GRB 090201: VLT NIR observations
  96. GRB 090201: Swift-BAT refined analysis
  97. GRB 090201: VLT afterglow candidate
  98. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  99. GRB090113: MAGIC telescope GeV observation
  100. GRB 090201: ROTSE-III Optical Limits

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Download all Circulars as a .tar.gz archive (updated once a day):
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