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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"

25562 results found.

  1. GRB 090417A: nearby galaxy redshift
  2. GRB 090417B: Swift detection of a burst
  3. GRB 090417: Swift detection of a short burst
  4. GRB 090411B: Fermi GBM detection
  5. GRB 090411A: Fermi GBM detection
  6. GRB 090410: Suzaku WAM observation of the prompt emission
  7. GRB 090408b: IPN Triangulation
  8. GRB 090328b: IPN Triangulation
  9. GRB 090410: Swift-BAT refined analysis
  10. GRB 090410: Swift detection of a burst
  11. Konus-Wind and Konus-RF observations of GRB 090408b
  12. GRB 090409: Fermi GBM detection
  13. Swift-BAT Trigger 348781 is not a GRB
  14. Swift-BAT Trigger 348720 is not a GRB
  15. GRB 090406: pseudo-z= 0.91 from prompt emission spectrum
  16. Swift-BAT trigger 348781: almost certainly not a burst
  17. GRB 090408: Swift detection of a burst
  18. GRB 090407: Swift-XRT refined analysis
  19. GRB 090407: Enhanced Swift-XRT position
  20. GRB 090407: Swift-BAT refined analysis
  21. Konus-Wind and Konus-RF observations of GRB 090406
  22. GRB 090407: Swift detection of a burst
  23. GRB 090404: millimeter detection
  24. GRB 090404: nIR observations at Calar Alto
  25. GRB 090405: Fermi GBM Detection
  26. GRB 090404: GROND upper limits
  27. GRB 090404: further NOT observations
  28. GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN
  29. GRB 090404: Swift-XRT Team refined analysis
  30. GRB 090404: Swift-BAT refined analysis
  31. GRB 090404: Enhanced Swift-XRT position
  32. GRB 090404: Swift detection of a burst
  33. GRB 090401A: Suzaku WAM observation of the prompt emission
  34. GRB 090401B: Suzaku WAM observation of the prompt emission
  35. Konus-Wind observation of GRB 090401B
  36. GRB 090401B: VLA radio upper limit
  37. GRB 090401B: Upper limits of MITSuME optical observation
  38. GRB 090401B: NOT optical observations
  39. GRB 090328: Fermi-LAT refined analysis
  40. Swift/UVOT observations of GRB090401B
  41. Swift/UVOT observations of GRB090401B
  42. GRB 090401B: Swift XRT Refined Analysis
  43. Konus-Wind observation of GRB 090401A
  44. GRB 090401B: Enhanced Swift-XRT position
  45. AGILE Gamma-ray detection of GRB 090401B
  46. GRB 090401B: Swift-BAT refined analysis
  47. Swift/UVOT detection of GRB090401B
  48. GRB 090401B: Swift detection of a burst
  49. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  50. GRB 090401, Swift-BAT refined analysis
  51. GRB 090323: Further TLS detections - a break?
  52. GRB 090401: Swift detection of a burst
  53. GRB 090324: Suzaku WAM observation of the prompt emission
  54. GRB 090328: Radio afterglow detection
  55. GRB 090326: Fermi GBM detection
  56. GRB 090328: BOOTES-3 optical observations
  57. GRB 090328: Fermi GBM Spectral Analysis
  58. GRB 090328B: Fermi GBM Detection
  59. GRB 090330: Fermi GBM detection
  60. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  61. GRB090323: Optical observations from NOT
  62. Konus-Wind observation of GRB 090328
  63. GRB 090328: Updated position/optical afterglow candidate
  64. GRB 090323: Radio afterglow detection
  65. GRB 090323: Additional Lick observations
  66. GRB 090327: Fermi GBM detection
  67. GRB 090320B: MASTER-Net prompt optical observations
  68. GRB 090323: RTT150 optical observations
  69. GRB 090323: Fermi GBM Spectral Analysis
  70. GRB 090323: UVOT Detection of Afterglow
  71. GRB 090323: Swift-XRT refined analysis
  72. Konus-Wind observation of GRB 090323
  73. GRB 090323: P60 Afterglow Confirmation
  74. GRB 090323: GROND Detection of the Afterglow and Photo-z
  75. SGR J1550-5418: two Fermi GBM triggers on March 22
  76. GRB 090323: Possible XRT Counterpart
  77. GRB 090320B: Fermi GBM detection.
  78. GRB 090319: Fermi GBM detection
  79. X-shooter observations of GRB 090313
  80. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  81. GRB 090315: Suzaku WAM observation of the prompt emission
  82. GRB 090313: VLT spectroscopy
  83. GRB090313: radio detection with the VLA
  84. Konus-Wind observation of GRB 090315
  85. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  86. GRB 090313, SMARTS optical/IR observations
  87. Further Swift/UVOT observations of GRB 090313
  88. GRB 090313: detection with CARMA in 3mm band
  89. GRB090305B: MASTER-net prompt optical short burst observations
  90. GRB 090313: Additional Gemini-S photometry
  91. GRB 090313: Light curve steepening
  92. GRB 090313: TAROT La Silla observatory optical detection
  93. GRB 090313: Gemini-S photometry
  94. GRB 090313 optical observations
  95. GRB 090313: Ongoing plateau phase
  96. GRB 090313: Swift-XRT refined analysis
  97. GRB 090313: Swift/UVOT upper limits
  98. GRB 090313: Faulkes Telescope North observations
  99. GRB 090306B: Confirmation of the X-ray afterglow
  100. GRB 090313: Swift-BAT refined analysis

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