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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"

19670 results found.

  1. GRB 090625B: Swift/UVOT Upper Limits
  2. GRB 090625B: Swift-XRT refined analysis
  3. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  4. GRB 090621A: Enhanced Swift-XRT position
  5. GRB 090621B: GRT Optical Observation
  6. GRB 090621A: GRT Optical Observation
  7. PAIRITEL observations of GRB 090618
  8. GRB 090621B: Fermi GBM detection
  9. GRB 090621B: I-band observations from 1.23m CAHA
  10. GRB 090621: Fermi GBM observation
  11. GRB 090621B: Swift/UVOT Upper Limits
  12. GRB 090621B: Swift-BAT refined analysis
  13. GRB 090621B: Swift-XRT refined analysis
  14. GRB 090621B: RTT150 optical observations
  15. GRB 090618: RTT150 optical observations
  16. GRB 090621A: Swift-BAT refined analysis
  17. GRB 090621B: Swift detection of a short hard burst
  18. GRB 090621: Swift/UVOT Upper Limits
  19. GRB 090621: Swift-XRT Team refined analysis
  20. GRB 090621: Swift detection of a burst
  21. GRB 090618: ZTSh optical observations
  22. GRB090618, underlying supernova search
  23. GRB 090618: Fermi GBM observation
  24. GRB 090618, Swift-BAT refined spectral analysis
  25. GRB090618 - Continued optical monitoring and light curve break
  26. GRB 090618: Swift-BAT refined analysis
  27. GRB090618: Swift-XRT team refined analysis
  28. GRB090618: Swift/UVOT bright afterglow detection
  29. Swift XRT observations of GRB 090531A
  30. GRB 090618: AGILE observations
  31. GRB 090618: Enhanced Swift-XRT position
  32. GRB 090618 Faulkes Telescope North observations
  33. GRB 090618: ROTSE-III Detection of Optical Counterpart
  34. GRB090618: P60 Optical Afterglow
  35. GRB 090618: Swift detection of a bright burst with optical afterglow
  36. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  37. RXTE Discovery of Pulsations from SGR 0418+5729
  38. GRB 090531B: Fermi GBM detection
  39. Discovery of a new soft gamma repeater source, SGR 0418+5729
  40. GRB 090607: XRT Team Refined Analysis
  41. GRB 090607: Swift/UVOT Upper Limits
  42. GRB 090607: Swift-BAT refined analysis of the SHB
  43. GRB 090607: Faulkes Telescope North observations
  44. GRB 090607: Swift detection of a burst
  45. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  46. GRB 090530: RTT150 Optical Observation
  47. GRB 090529A: RTT150 Optical Observations
  48. GRB 090531B: GROND observation
  49. GRB 090530: Early RAPTOR Optical Observations
  50. GRB 090531B: Swift/BAT spectral lag results
  51. Corrections to GRB 090531B Swift/UVOT Upper Limits
  52. GRB 090531B, RIMOTS optical upper limits
  53. GRB 090531B: Swift/UVOT Upper Limits
  54. GRB 090530: GRT Optical Observation
  55. GRB 090531B: Swift-BAT refined analysis
  56. Initial Swift/UVOT observations of GRB 090531B
  57. GRB 090531B: Swift-XRT candidate afterglow position
  58. GRB 090531B: ROTSE-III Optical Limits
  59. GRB 090531B: Swift detection of a burst
  60. GRB 090531: Swift-BAT refined analysis
  61. GRB 090530: break in light curve
  62. GRB 090531: GROND upper limits
  63. GRB 090531: Swift detection of a burst
  64. GRB090530: Swift XRT refined analysis
  65. GRB090530: Swift/UVOT afterglow detection
  66. GRB 090529: Swift-XRT refined analysis
  67. GRB 090530: Enhanced Swift-XRT position
  68. GRB 090530: Swift-BAT refined analysis
  69. GRB 090530: PAIRITEL NIR Detections
  70. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  71. GRB 090530: Swift detection of a burst with an optical counterpart
  72. GRB 090529: optical observations
  73. GRB 090529: TLS Afterglow Observations
  74. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  75. GRB 090529: Swift-BAT refined analysis
  76. GRB 090529: Enhanced Swift-XRT position
  77. GRB 090529: Preliminary Swift/UVOT Upper Limit
  78. GRB 090529: Swift detection of a burst
  79. GRB 090520B: Fermi GBM detection
  80. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  81. GRB 090518: Fermi GBM detection
  82. GRB 090520 Swift-BAT detection of a burst in ground analysis
  83. GRB 090423: Fermi GBM T90 follow-up analysis results
  84. GRB 090516: Fermi GBM observation
  85. GRB 090519: Swift-XRT refined analysis
  86. GRB 090519: GROND observation
  87. GRB 090519: Swift/UVOT Upper Limits
  88. GRB 090519, Swift-BAT refined analysis
  89. GRB 090519: Enhanced Swift-XRT position
  90. GRB 090519: FARO Chante Perdrix Observatory optical observations
  91. GRB 090519: TAROT Calern observatory optical observations
  92. GRB 090519: Swift detection of a burst
  93. GRB 090518: Swift/UVOT Upper Limits
  94. GRB 090518, Swift-BAT refined analysis
  95. GRB 090516, RIMOTS optical upper limits
  96. GRB090518 : Optical upper limit by MOA-II telescope
  97. GRB 090518: Swift-XRT refined analysis
  98. GRB 090518: Enhanced Swift-XRT position
  99. GRB 090518: Swift detection of a burst
  100. GRB 090515: Swift/BAT spectral lag results

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