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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"

26332 results found.

  1. GRB 090404: Enhanced Swift-XRT position
  2. GRB 090404: Swift detection of a burst
  3. GRB 090401A: Suzaku WAM observation of the prompt emission
  4. GRB 090401B: Suzaku WAM observation of the prompt emission
  5. Konus-Wind observation of GRB 090401B
  6. GRB 090401B: VLA radio upper limit
  7. GRB 090401B: Upper limits of MITSuME optical observation
  8. GRB 090401B: NOT optical observations
  9. GRB 090328: Fermi-LAT refined analysis
  10. Swift/UVOT observations of GRB090401B
  11. Swift/UVOT observations of GRB090401B
  12. GRB 090401B: Swift XRT Refined Analysis
  13. Konus-Wind observation of GRB 090401A
  14. GRB 090401B: Enhanced Swift-XRT position
  15. AGILE Gamma-ray detection of GRB 090401B
  16. GRB 090401B: Swift-BAT refined analysis
  17. Swift/UVOT detection of GRB090401B
  18. GRB 090401B: Swift detection of a burst
  19. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  20. GRB 090401, Swift-BAT refined analysis
  21. GRB 090323: Further TLS detections - a break?
  22. GRB 090401: Swift detection of a burst
  23. GRB 090324: Suzaku WAM observation of the prompt emission
  24. GRB 090328: Radio afterglow detection
  25. GRB 090326: Fermi GBM detection
  26. GRB 090328: BOOTES-3 optical observations
  27. GRB 090328: Fermi GBM Spectral Analysis
  28. GRB 090328B: Fermi GBM Detection
  29. GRB 090330: Fermi GBM detection
  30. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  31. GRB090323: Optical observations from NOT
  32. Konus-Wind observation of GRB 090328
  33. GRB 090328: Updated position/optical afterglow candidate
  34. GRB 090323: Radio afterglow detection
  35. GRB 090323: Additional Lick observations
  36. GRB 090327: Fermi GBM detection
  37. GRB 090320B: MASTER-Net prompt optical observations
  38. GRB 090323: RTT150 optical observations
  39. GRB 090323: Fermi GBM Spectral Analysis
  40. GRB 090323: UVOT Detection of Afterglow
  41. GRB 090323: Swift-XRT refined analysis
  42. Konus-Wind observation of GRB 090323
  43. GRB 090323: P60 Afterglow Confirmation
  44. GRB 090323: GROND Detection of the Afterglow and Photo-z
  45. SGR J1550-5418: two Fermi GBM triggers on March 22
  46. GRB 090323: Possible XRT Counterpart
  47. GRB 090320B: Fermi GBM detection.
  48. GRB 090319: Fermi GBM detection
  49. X-shooter observations of GRB 090313
  50. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  51. GRB 090315: Suzaku WAM observation of the prompt emission
  52. GRB 090313: VLT spectroscopy
  53. GRB090313: radio detection with the VLA
  54. Konus-Wind observation of GRB 090315
  55. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  56. GRB 090313, SMARTS optical/IR observations
  57. Further Swift/UVOT observations of GRB 090313
  58. GRB 090313: detection with CARMA in 3mm band
  59. GRB090305B: MASTER-net prompt optical short burst observations
  60. GRB 090313: Additional Gemini-S photometry
  61. GRB 090313: Light curve steepening
  62. GRB 090313: TAROT La Silla observatory optical detection
  63. GRB 090313: Gemini-S photometry
  64. GRB 090313 optical observations
  65. GRB 090313: Ongoing plateau phase
  66. GRB 090313: Swift-XRT refined analysis
  67. GRB 090313: Swift/UVOT upper limits
  68. GRB 090313: Faulkes Telescope North observations
  69. GRB 090306B: Confirmation of the X-ray afterglow
  70. GRB 090313: Swift-BAT refined analysis
  71. GRB 090313: SDSS object underlying the optical afterglow position
  72. GRB 090313, GROND observations
  73. GRB 090313: Swift detection of a burst
  74. GRB 090313: Swift detection of a burst
  75. GRB090310: Fermi GBM detection
  76. GRB 090205: Zadko Telescope late-time observations
  77. GRB 090307A: TAROT Calern observatory optical observations
  78. GRB090305B: Fermi GBM detection
  79. GRB 090309B: Fermi GBM detection
  80. GRB 090309: Swift-XRT refined analysis
  81. GRB 090309: Enhanced Swift-XRT position
  82. GRB 090306B: INTEGRAL SPI-ACS light curve
  83. GRB 090309, Swift-BAT refined analysis
  84. GRB 090308: GROND observations
  85. GRB 090308: Gemini GMOS Observations
  86. GRB 090309: Swift detection of a burst
  87. GRB 090308B: Fermi GBM detection
  88. GRB 090307B: Fermi GBM detection
  89. GRB 090306C: Fermi GBM detection
  90. GRB 090307: GROND Upper Limits
  91. GRB 090306B: GROND Upper Limits
  92. GRB 090305C: Suzaku WAM observation of the prompt emission
  93. GRB 090308: Swift-XRT refined analysis
  94. Radio observation of GRB 090201 with ATCA
  95. Radio observation of GRB 090117 with ATCA
  96. Radio observation of GRB 081226b with ATCA
  97. Radio observation of GRB 081226a with ATCA
  98. Radio observation of GRB 081007 with ATCA
  99. ATCA observation of SGR J1550-5418
  100. GRB 090308: Swift-BAT refined analysis

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