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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"

24381 results found.

  1. GRB 090530B: Fermi GBM detection
  2. Corrections to GRB 090531B Swift/UVOT Upper Limits
  3. GRB 090528B: MASTER-II Kourovka optical limit
  4. GRB 090531B: Swift-BAT refined analysis
  5. GRB 090531B: ROTSE-III Optical Limits
  6. GRB 090531B: Swift detection of a burst
  7. GRB 090531: Swift-BAT refined analysis
  8. GRB 090530: break in light curve
  9. GRB 090531: P60 Observations
  10. GRB 090528B: Fermi GBM detection
  11. GRB 090528: Fermi GBM detection
  12. GRB 090530: Swift-BAT refined analysis
  13. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  14. GRB 090529: TLS Afterglow Observations
  15. GRB 090529: Swift-BAT refined analysis
  16. GRB 090529: Xinglong TNT optical observation
  17. GRB 090520D: Fermi GBM detection
  18. GRB 090520C: Fermi GBM detection
  19. GRB 090520B: Fermi GBM detection
  20. GRB 090522 : Fermi GBM detection
  21. GRB 090524: Fermi GBM detection
  22. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  23. GRB 090513B: Fermi GBM detection
  24. GRB 090518: Fermi GBM detection
  25. GRB 090516C: Fermi GBM detection
  26. GRB 090516: Fermi GBM observation
  27. GRB 090516B: Fermi GBM detection
  28. GRB 090519B: Fermi GBM detection
  29. GRB 090519: GROND observation
  30. GRB 090519, Swift-BAT refined analysis
  31. GRB 090511: Fermi GBM Detection
  32. GRB 090514: Fermi GBM detection
  33. GRB090518: GROND upper limits
  34. GRB 090518, Swift-BAT refined analysis
  35. GRB 090518B: Fermi GBM detection
  36. GRB090513: Fermi GBM detection
  37. GRB 090515: Swift/BAT spectral lag results
  38. GRB 090516: Swift-BAT refined analysis
  39. GRB 090516: GROND OBSERVATIONS
  40. GRB 090516 - Zadko Telescope observations
  41. GRB 090516: Faulkes Telescope South optical afterglow
  42. GRB 090515: Swift-XRT refined analysis
  43. GRB 090509: Fermi GBM observation
  44. GRB 090515: Swift-BAT refined analysis
  45. GRB 090515: PAIRITEL Upper Limits
  46. GRB 090515: ROTSE-III Optical Limits
  47. GRB090510: VLT/FORS2 spectroscopic redshift
  48. GRB 090510: GROND observations
  49. GRB 090509, further Swift-BAT refined analysis
  50. GRB 090510B: Fermi GBM detection
  51. GRB 090502: Fermi GBM detection
  52. GRB 090510: Swift-BAT refined analysis
  53. GRB 090509: Swift-BAT refined analysis
  54. Fermi LAT detection of GRB 090510
  55. GRB 090509, SMARTS optical/IR afterglow observations
  56. GRB 090510: Swift/UVOT Detection of a Candidate Optical Afterglow
  57. GRB 090323: optical observations
  58. GRB 090427: GROND observations
  59. GRB 090429A: ROVOR magnitude limit
  60. GRB 090428B: Suzaku WAM observation of the prompt emission
  61. GRB 090424, SMARTS optical/IR afterglow monitoring
  62. GRB 090429D: Fermi GBM detection
  63. GRB 090429C: Fermi GBM detection
  64. GRB 090424: YNAO-GMG observations
  65. GRB 090429A: GROND upper limits
  66. GRB 090427C: Fermi GBM detection
  67. GRB 090427B: Fermi GBM detection
  68. GRB 090426C: Fermi GBM detection
  69. GRB 090426B: Fermi GBM detection/observation
  70. Konus-Wind observation of very bright GRB 090427
  71. GRB 090428B: Fermi GBM detection
  72. GRB 090428: Fermi GBM detection
  73. GRB 090429B: RIMOTS optical upper limits
  74. GRB 090429B: Swift-BAT refined analysis
  75. GRB 090429A: Swift-BAT refined analysis
  76. GRB090429B: Gemini-N infrared IR candidate
  77. GRB 090429B: GROND Observations
  78. GRB 090429B: Super-LOTIS early observations
  79. IPN triangulation of very bright GRB 090427
  80. GRB 090423: CARMA mm observations
  81. GRB 090425: Fermi GBM detection
  82. GRB 090424: Suzaku WAM observation of the prompt emission
  83. GRB 090426: VLT spectroscopy
  84. GRB 090426: Swift-BAT refined analysis
  85. GRB 090426: Swift-XRT refined analysis
  86. GRB 090423: GROND second epoch imaging and refined SED
  87. GRB 090424: MASTER-Net prompt optical limit
  88. GRB090423: Y-band limit
  89. GRB 090423: Swift/BAT spectral lag results
  90. GRB 090424 optical observations
  91. GRB 090424: Swift-XRT refined analysis
  92. GRB 090424: MASTER-Net prompt optical observations
  93. GRB 090424: Swift-BAT refined analysis
  94. GRB 090424: Fermi GBM Observation
  95. GRB 090423: Fermi GBM observation
  96. GRB 090422: Fermi GBM observation
  97. GRB 090423: NOT z-band limit
  98. GRB090418A Rc-band photometry
  99. GRB090423, RIMOTS optical upper limits
  100. GRB 090423: Swift-BAT refined analysis

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