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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"

28233 results found.

  1. GRB 090621: Swift-XRT Team refined analysis
  2. GRB090618: Spectrum and photometry from 6.0m BTA
  3. GRB 090621: Swift detection of a burst
  4. GRB090618, underlying supernova search
  5. GRB090618: OAA-OAUV Optical observations
  6. GRB 090618: Fermi GBM observation
  7. GRB 090618, Swift-BAT refined spectral analysis
  8. VLA radio detection of GRB 090618
  9. GRB 090618 15GHz radio detection
  10. GRB090618 - Continued optical monitoring and light curve break
  11. GRB 090618: Swift-BAT refined analysis
  12. GRB 090618: SARA observations
  13. GRB090618: Swift-XRT team refined analysis
  14. GRB090618: Swift/UVOT bright afterglow detection
  15. GRB 090618: SDSS host detection
  16. Swift XRT observations of GRB 090531A
  17. GRB 090618: AGILE observations
  18. GRB 090617: Fermi GBM detection
  19. GRB 090618: Enhanced Swift-XRT position
  20. GRB 090618 Faulkes Telescope North observations
  21. GRB 090618: ROTSE-III Detection of Optical Counterpart
  22. GRB090618: P60 Optical Afterglow
  23. GRB 090618: Swift detection of a bright burst with optical afterglow
  24. GRB 090616: Fermi GBM detection
  25. GRB 090612: Fermi GBM detection
  26. GRB 090610C: Fermi GBM detection
  27. GRB 090610B: Fermi GBM detection
  28. GRB 090610: Fermi GBM detection
  29. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  30. GRB 090602: Suzaku WAM observation of the prompt emission
  31. RXTE Discovery of Pulsations from SGR 0418+5729
  32. GRB 090531B: Fermi GBM detection
  33. Konus-RF observation of SGR burst 090605A
  34. Discovery of a new soft gamma repeater source, SGR 0418+5729
  35. GRB 090608: Fermi GBM detection
  36. GRB 090606: Fermi GBM detection
  37. GRB 090607: XRT Team Refined Analysis
  38. GRB 090607: Swift/UVOT Upper Limits
  39. GRB 090607: Swift-BAT refined analysis of the SHB
  40. GRB 090607: GRAS001 optical observations
  41. GRB 090607: Faulkes Telescope North observations
  42. GRB 090607: Swift detection of a burst
  43. GRB 090530B: Suzaku WAM observation of the prompt emission
  44. GRB 090530: Further NOT optical observations
  45. GRB 090530: RTT150 Optical Observation
  46. GRB 090602: Fermi GBM detection
  47. GRB 090529A: RTT150 Optical Observations
  48. GMRT observation of GRB 090424 afterglow
  49. GRB 090528: Suzaku WAM observation of the prompt emission
  50. GRB090529: Further NOT optical observations
  51. GRB 090531B: GROND observation
  52. GRB 090528B: Suzaku WAM observation of the prompt emission
  53. GRB 090530: Early RAPTOR Optical Observations
  54. GRB090529B: ROVOR Upper Limits
  55. GRB 090531A: SARA upper limit
  56. GRB 090531B: Swift/BAT spectral lag results
  57. GRB 090529C: Fermi GBM detection
  58. GRB 090529B: Fermi GBM detection
  59. GRB 090530B: Fermi GBM detection
  60. Corrections to GRB 090531B Swift/UVOT Upper Limits
  61. GRB 090531B, RIMOTS optical upper limits
  62. GRB 090531B: Swift/UVOT Upper Limits
  63. GRB 090528B: MASTER-II Kourovka optical limit
  64. GRB 090529: MITSuME optical observation
  65. GRB 090530: GRT Optical Observation
  66. GRB 090531B: Swift-BAT refined analysis
  67. GRB 090531B: Swift-XRT candidate afterglow position
  68. GRB 090531B: ROTSE-III Optical Limits
  69. GRB 090531: Swift-BAT refined analysis
  70. GRB090530: R-band Observation
  71. GRB 090530: break in light curve
  72. GRB 090531: GROND upper limits
  73. GRB 090531: P60 Observations
  74. GRB 090529: NOT optical observations
  75. GRB 090530: NOT optical observations
  76. GRB090530: Swift XRT refined analysis
  77. GRB090530: Swift/UVOT afterglow detection
  78. GRB 090529: Swift-XRT refined analysis
  79. GRB 090528B: Fermi GBM detection
  80. GRB 090528: Fermi GBM detection
  81. GRB 090530: Enhanced Swift-XRT position
  82. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
  83. GRB 090530: Swift-BAT refined analysis
  84. GRB 090530: GRAS002 refined OA analysis
  85. GRB 090530: GRAS002 optical observations
  86. GRB 090530: PAIRITEL NIR Detections
  87. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  88. GRB 090530: Swift detection of a burst with an optical counterpart
  89. GRB 090529: TLS Afterglow Observations
  90. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  91. GRB 090529: Swift-BAT refined analysis
  92. GRB 090529: Enhanced Swift-XRT position
  93. GRB 090529: Preliminary Swift/UVOT Upper Limit
  94. GRB 090529: Swift detection of a burst
  95. GRB 090520D: Fermi GBM detection
  96. GRB 090520C: Fermi GBM detection
  97. GRB 090520B: Fermi GBM detection
  98. GRB 090522 : Fermi GBM detection
  99. GRB 090524: Fermi GBM detection
  100. GRB 090518 - NOT upper limit

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