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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"

19538 results found.

  1. GRB 090618: ROTSE-III Detection of Optical Counterpart
  2. GRB090618: P60 Optical Afterglow
  3. GRB 090618: Swift detection of a bright burst with optical afterglow
  4. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  5. RXTE Discovery of Pulsations from SGR 0418+5729
  6. GRB 090531B: Fermi GBM detection
  7. Discovery of a new soft gamma repeater source, SGR 0418+5729
  8. GRB 090607: XRT Team Refined Analysis
  9. GRB 090607: Swift/UVOT Upper Limits
  10. GRB 090607: Swift-BAT refined analysis of the SHB
  11. GRB 090607: Faulkes Telescope North observations
  12. GRB 090607: Swift detection of a burst
  13. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  14. GRB 090530: RTT150 Optical Observation
  15. GRB 090529A: RTT150 Optical Observations
  16. GRB 090531B: GROND observation
  17. GRB 090530: Early RAPTOR Optical Observations
  18. GRB 090531B: Swift/BAT spectral lag results
  19. Corrections to GRB 090531B Swift/UVOT Upper Limits
  20. GRB 090531B, RIMOTS optical upper limits
  21. GRB 090531B: Swift/UVOT Upper Limits
  22. GRB 090530: GRT Optical Observation
  23. GRB 090531B: Swift-BAT refined analysis
  24. Initial Swift/UVOT observations of GRB 090531B
  25. GRB 090531B: Swift-XRT candidate afterglow position
  26. GRB 090531B: ROTSE-III Optical Limits
  27. GRB 090531B: Swift detection of a burst
  28. GRB 090531: Swift-BAT refined analysis
  29. GRB 090530: break in light curve
  30. GRB 090531: GROND upper limits
  31. GRB 090531: Swift detection of a burst
  32. GRB090530: Swift XRT refined analysis
  33. GRB090530: Swift/UVOT afterglow detection
  34. GRB 090529: Swift-XRT refined analysis
  35. GRB 090530: Enhanced Swift-XRT position
  36. GRB 090530: Swift-BAT refined analysis
  37. GRB 090530: PAIRITEL NIR Detections
  38. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  39. GRB 090530: Swift detection of a burst with an optical counterpart
  40. GRB 090529: optical observations
  41. GRB 090529: TLS Afterglow Observations
  42. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  43. GRB 090529: Swift-BAT refined analysis
  44. GRB 090529: Enhanced Swift-XRT position
  45. GRB 090529: Preliminary Swift/UVOT Upper Limit
  46. GRB 090529: Swift detection of a burst
  47. GRB 090520B: Fermi GBM detection
  48. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  49. GRB 090518: Fermi GBM detection
  50. GRB 090520 Swift-BAT detection of a burst in ground analysis
  51. GRB 090423: Fermi GBM T90 follow-up analysis results
  52. GRB 090516: Fermi GBM observation
  53. GRB 090519: Swift-XRT refined analysis
  54. GRB 090519: GROND observation
  55. GRB 090519: Swift/UVOT Upper Limits
  56. GRB 090519, Swift-BAT refined analysis
  57. GRB 090519: Enhanced Swift-XRT position
  58. GRB 090519: FARO Chante Perdrix Observatory optical observations
  59. GRB 090519: TAROT Calern observatory optical observations
  60. GRB 090519: Swift detection of a burst
  61. GRB 090518: Swift/UVOT Upper Limits
  62. GRB 090518, Swift-BAT refined analysis
  63. GRB 090516, RIMOTS optical upper limits
  64. GRB090518 : Optical upper limit by MOA-II telescope
  65. GRB 090518: Swift-XRT refined analysis
  66. GRB 090518: Enhanced Swift-XRT position
  67. GRB 090518: Swift detection of a burst
  68. GRB 090515: Swift/BAT spectral lag results
  69. GRB 090516: Swift-BAT refined analysis
  70. GRB 090516: GROND OBSERVATIONS
  71. GRB 090516 - Zadko Telescope observations
  72. GRB 090516: Swift XRT refined analysis
  73. GRB 090516: Swift/UVOT Observations
  74. GRB 090516: Enhanced Swift-XRT position
  75. GRB 090516: Faulkes Telescope South optical afterglow
  76. GRB 090516: Swift detection of a burst
  77. GRB 090515: ROVOR Upper Limit
  78. GRB 090515: MMT/MMIRS NIR Upper Limit
  79. GRB 090515: Swift/UVOT Observations
  80. GRB 090515: Swift-XRT refined analysis
  81. GRB 090515: Enhanced Swift-XRT position
  82. GRB 090509: Fermi GBM observation
  83. GRB 090515: Swift-BAT refined spectral analysis
  84. GRB 090515: Swift-BAT refined analysis
  85. GRB 090509 - Zadko Telescope observations
  86. GRB 090515: Super-LOTIS Upper Limits
  87. GRB 090515: PAIRITEL Upper Limits
  88. GRB 090515: KAIT optical upper limits
  89. GRB 090515: ROTSE-III Optical Limits
  90. GRB 090515: Swift detection of a short burst
  91. GRB 090510: Suzaku WAM observation of the prompt emission
  92. GRB090510: VLT/FORS2 spectroscopic redshift
  93. GRB 090510: GROND observations
  94. GRB 090510: Swift/UVOT host galaxy candidates
  95. GRB 090510: Fermi-LAT follow-up analysis
  96. GRB 090509, further Swift-BAT refined analysis
  97. Konus-Wind observation of GRB 090510
  98. GRB 090510: UVOT refined analysis
  99. GRB 090510: Swift XRT refined analysis
  100. GRB 090510: Enhanced Swift-XRT position

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