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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28228 results found.

  1. GRB 090618: Fermi GBM observation
  2. GRB 090618, Swift-BAT refined spectral analysis
  3. VLA radio detection of GRB 090618
  4. GRB 090618 15GHz radio detection
  5. GRB090618 - Continued optical monitoring and light curve break
  6. GRB 090618: Swift-BAT refined analysis
  7. GRB 090618: SARA observations
  8. GRB090618: Swift-XRT team refined analysis
  9. GRB090618: Swift/UVOT bright afterglow detection
  10. GRB 090618: SDSS host detection
  11. Swift XRT observations of GRB 090531A
  12. GRB 090618: AGILE observations
  13. GRB 090617: Fermi GBM detection
  14. GRB 090618: Enhanced Swift-XRT position
  15. GRB 090618 Faulkes Telescope North observations
  16. GRB 090618: ROTSE-III Detection of Optical Counterpart
  17. GRB090618: P60 Optical Afterglow
  18. GRB 090618: Swift detection of a bright burst with optical afterglow
  19. GRB 090616: Fermi GBM detection
  20. GRB 090612: Fermi GBM detection
  21. GRB 090610C: Fermi GBM detection
  22. GRB 090610B: Fermi GBM detection
  23. GRB 090610: Fermi GBM detection
  24. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  25. GRB 090602: Suzaku WAM observation of the prompt emission
  26. RXTE Discovery of Pulsations from SGR 0418+5729
  27. GRB 090531B: Fermi GBM detection
  28. Konus-RF observation of SGR burst 090605A
  29. Discovery of a new soft gamma repeater source, SGR 0418+5729
  30. GRB 090608: Fermi GBM detection
  31. GRB 090606: Fermi GBM detection
  32. GRB 090607: XRT Team Refined Analysis
  33. GRB 090607: Swift/UVOT Upper Limits
  34. GRB 090607: Swift-BAT refined analysis of the SHB
  35. GRB 090607: GRAS001 optical observations
  36. GRB 090607: Faulkes Telescope North observations
  37. GRB 090607: Swift detection of a burst
  38. GRB 090530B: Suzaku WAM observation of the prompt emission
  39. GRB 090530: Further NOT optical observations
  40. GRB 090530: RTT150 Optical Observation
  41. GRB 090602: Fermi GBM detection
  42. GRB 090529A: RTT150 Optical Observations
  43. GMRT observation of GRB 090424 afterglow
  44. GRB 090528: Suzaku WAM observation of the prompt emission
  45. GRB090529: Further NOT optical observations
  46. GRB 090531B: GROND observation
  47. GRB 090528B: Suzaku WAM observation of the prompt emission
  48. GRB 090530: Early RAPTOR Optical Observations
  49. GRB090529B: ROVOR Upper Limits
  50. GRB 090531A: SARA upper limit
  51. GRB 090531B: Swift/BAT spectral lag results
  52. GRB 090529C: Fermi GBM detection
  53. GRB 090529B: Fermi GBM detection
  54. GRB 090530B: Fermi GBM detection
  55. Corrections to GRB 090531B Swift/UVOT Upper Limits
  56. GRB 090531B, RIMOTS optical upper limits
  57. GRB 090531B: Swift/UVOT Upper Limits
  58. GRB 090528B: MASTER-II Kourovka optical limit
  59. GRB 090529: MITSuME optical observation
  60. GRB 090530: GRT Optical Observation
  61. GRB 090531B: Swift-BAT refined analysis
  62. GRB 090531B: Swift-XRT candidate afterglow position
  63. GRB 090531B: ROTSE-III Optical Limits
  64. GRB 090531: Swift-BAT refined analysis
  65. GRB090530: R-band Observation
  66. GRB 090530: break in light curve
  67. GRB 090531: GROND upper limits
  68. GRB 090531: P60 Observations
  69. GRB 090529: NOT optical observations
  70. GRB 090530: NOT optical observations
  71. GRB090530: Swift XRT refined analysis
  72. GRB090530: Swift/UVOT afterglow detection
  73. GRB 090529: Swift-XRT refined analysis
  74. GRB 090528B: Fermi GBM detection
  75. GRB 090528: Fermi GBM detection
  76. GRB 090530: Enhanced Swift-XRT position
  77. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
  78. GRB 090530: Swift-BAT refined analysis
  79. GRB 090530: GRAS002 refined OA analysis
  80. GRB 090530: GRAS002 optical observations
  81. GRB 090530: PAIRITEL NIR Detections
  82. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  83. GRB 090530: Swift detection of a burst with an optical counterpart
  84. GRB 090529: TLS Afterglow Observations
  85. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  86. GRB 090529: Swift-BAT refined analysis
  87. GRB 090529: Enhanced Swift-XRT position
  88. GRB 090529: Preliminary Swift/UVOT Upper Limit
  89. GRB 090529: Swift detection of a burst
  90. GRB 090520D: Fermi GBM detection
  91. GRB 090520C: Fermi GBM detection
  92. GRB 090520B: Fermi GBM detection
  93. GRB 090522 : Fermi GBM detection
  94. GRB 090524: Fermi GBM detection
  95. GRB 090518 - NOT upper limit
  96. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  97. GRB 090513B: Fermi GBM detection
  98. GRB 090520: GROND upper limits
  99. GRB 090518: Fermi GBM detection
  100. GRB 090516C: Fermi GBM detection

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