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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"

35422 results found.

  1. GRB 090227A: Suzaku WAM observation of the prompt emission
  2. GRB 090305: Magellan confirmation of the optical afterglow
  3. GRB090305: GMOS-S Candidate Optical Afterglow
  4. GRB 090305: Swift detection of a short burst
  5. GRB 090303: Fermi GBM detection
  6. GRB 090304: Fermi GBM detection
  7. GRB 090301A: Suzaku WAM observation of the prompt emission
  8. Konus-RF catches first GRB and SGR bursts
  9. GRB 090228B: Fermi GBM detection
  10. Konus-Wind observation of bright short GRB 090227B
  11. IPN localization of short bright GRB 090227B
  12. Konus-Wind observation of GRB 090301A
  13. GRB 090301A: Swift-BAT refined analysis
  14. GRB 090301B: Fermi GBM detection
  15. GRB 090227B: Fermi GBM detection
  16. GRB 090301: Swift detection of a burst
  17. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  18. GRB 090228: Fermi GBM detection
  19. GRB 090227: Fermi GBM detection
  20. GRB 090206: Fermi GBM detection
  21. GRB 081211B: Nearby cluster
  22. GRB 090222: Fermi GBM detection
  23. GRB 090219: Fermi GBM detection
  24. Swift Trigger 343319 is not a GRB
  25. GRB 090217: Suzaku WAM observation of the prompt emission
  26. GRB090217: XRT analysis
  27. Konus-Wind observation of GRB 090217
  28. IPN localization of GRB 090217
  29. GRB 090213: Fermi GBM detection
  30. GRB090217: Fermi-LAT Detection
  31. GRB 090217: Fermi GBM detection
  32. GRB 090207 - Fermi GBM Observations
  33. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  34. GRB 090129: Fermi GBM detection
  35. VLA radio upper limit on GRB 090205
  36. GRB 090205: VLT optical decay
  37. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  38. GRB 090205: Swift/UVOT Upper Limits
  39. GRB 090205: VLT refined redshift
  40. GRB 090205: Swift-XRT refined analysis
  41. GRB 090205: Swift burst of interest
  42. GRB 090205: VLT spectroscopic redshift
  43. GRB 090205: GROND observations and photometric redshift estimate
  44. GRB 090205: VLT candidate afterglow
  45. GRB 090205: Swift-BAT refined analysis
  46. GRB 090205: Enhanced Swift-XRT position
  47. GRB 090205: Swift detection of a burst
  48. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  49. GRB 090131: Suzaku WAM observation of the prompt emission
  50. GRB 090126A: Swift-XRT afterglow confirmation
  51. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  52. Konus-Wind observation of GRB 090201
  53. GRB 090202: Fermi GBM detection
  54. GRB 090131: Fermi GBM detection
  55. GRB 090201: Swift-XRT refined analysis
  56. GRB090201: Swift UVOT upper limits
  57. GRB 090201: object inside the enhanced XRT error circle
  58. GRB 090201: Enhanced Swift-XRT position
  59. GRB 090201: VLT NIR observations
  60. GRB 090201: Swift-BAT refined analysis
  61. GRB 090201: VLT afterglow candidate
  62. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  63. GRB090113: MAGIC telescope GeV observation
  64. GRB 090201: ROTSE-III Optical Limits
  65. GRB 090201: Swift detection of a burst
  66. GRB 090126A: Swift/UVOT Upper Limits
  67. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  68. GRB 090129: Swift-BAT refined analysis
  69. GRB 090129: Swift detection of a burst
  70. IBAS Alert N. 5442 is not a GRB
  71. GRB 090102: HST observations and host galaxy
  72. GRB 090126C: Fermi GBM detection
  73. GRB 090126A: Swift-XRT Refined Analysis
  74. GRB 090126B: Fermi GBM detection
  75. GRB 090126: SuperAGILE Localization of a Long GRB
  76. GRB 090118: no afterglow candidate
  77. GRB 090123: GROND detection
  78. GRB 090123: Swift XRT refined analysis
  79. GRB 090123: Swift/UVOT Observations
  80. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  81. GRB 090123: Swift-BAT refined analysis
  82. GRB 090123: Swift detection of a burst
  83. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  84. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  85. Swift-BAT trigger 340734 is not a GRB
  86. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  87. GRB 090117C: Suzaku WAM observation of the prompt emission
  88. Trigger 340734: Swift detection of a possible short burst
  89. GRB 090118: Subaru NIR Observation
  90. GRB 090118: KPNO 4m 2nd Epoch Observations
  91. GRB 090118 (BATSS): GRT Optical Observation
  92. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  93. GRB 090118: Swift-XRT observations
  94. GRB090118 Swift/UVOT upper limits
  95. GRB 090118: GROND Upper Limits
  96. GRB 090118: Possible burst detection from Swift-BAT slew data
  97. GRB 090117B : Fermi GBM detection
  98. GRB 090117: confirmation of the X-ray afterglow
  99. GRB 090117C - Fermi GRB Detection
  100. GRB 090117 - Fermi GBM Observations

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