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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"

41701 results found.

  1. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  2. CFHTLS optical transient unlikely to be a GRB
  3. Unusual optical transient (GRB ???)
  4. GRB050117a: Radio Observations
  5. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  6. GRB050117: Palomar WIRC Ks-band observations
  7. GRB050117b: Swift-BAT detection of a weak burst
  8. GRB050117: optical observation
  9. GRB 050117, I-band observations
  10. GRB 050117: Optical observation
  11. GRB050117: Refined XRT position
  12. GRB050117: MASTER optical observations
  13. MASTER:GRB050117 SWIFT
  14. GRB050117: Swift-BAT detection of a long multi-peaked burst
  15. SGR 1806-20: Further VLA Observations
  16. SGR 1806-20: Further low frequency GMRT results
  17. SGR 1806-20: Further VLA Observations
  18. SGR1806-20: Swift-BAT observations of two additional bursts
  19. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  20. Further VLA observations of SGR 1806-20
  21. Further ATCA observations of SGR 1806-20
  22. Fourth Epoch VLA observations of SGR 1806-20
  23. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  24. SGR 1806-20: Temporal and Spectral behavior of radio transient
  25. ATCA observations of SGR 1806-20
  26. SGR 1806-20, RHESSI observations of the 041227 giant flare
  27. Third epoch observations of SGR 1806-20 with VLA
  28. Second Epoch VLA observations of SGR 1806-20
  29. Second-epoch VLA observations of SGR 1806-20
  30. SGR1806: Detection of a Sudden Ionospheric Disturbance
  31. VLA observations of SGR 1806-20
  32. SGR1806 VLA Observations
  33. VLA observations of SGR 1806-20
  34. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  35. GRB 041217: Optical observations
  36. SGR1806-20: Swift-BAT observation of the 041227 super-flare
  37. GRB041219, early time observations
  38. The giant outburst from SGR 1806-20
  39. IPN localization of giant flare from SGR1806-20
  40. Giant flare from SGR 1806-20 detected by INTEGRAL
  41. GRB041228: ROTSE-III Optical Observations
  42. GRB041228: Swift-BAT detection of a burst
  43. GRB041219; RXTE ASM Observations
  44. NIR Observations of GRB 041219
  45. GRB041226: ROTSE-III Optical Observations
  46. GRB041226: Swift-BAT detection of a burst
  47. GRB041223: decay of the afterglow
  48. GRB041224: ROTSE-III Optical Observations
  49. GRB 041224: near-infrared observations with REM
  50. GRB 041223 Fluence measured by Swift-BAT
  51. GRB041224: Swift-BAT detection of a soft burst
  52. GRB041223: optical and NIR observations with REM
  53. Swift-BAT Time History of GRB041219
  54. GRB 041219: TAROT optical observations
  55. GRB 041218: TAROT optical observations
  56. GRB 041223: J-band observations of the afterglow
  57. GRB 041223: Detection of Optical Transient with LCO40
  58. GRB041223: Swift XRT Detection of X-ray Afterglow Emission
  59. GRB 041219c: PROMPT Observations
  60. GRB041223: ROTSE-III Optical Observations
  61. GRB041223: Swift-BAT detection of a bright long burst
  62. GRB 041218: optical observations
  63. Very high activity of SGR 1806-20
  64. GRB 041219: Second Epoch WSRT Radio Observations
  65. GRB 041219: WSRT Radio Afterglow Detection
  66. GRB 041219: Keck IR Observations and Astrometric Refinement of the
  67. GRB 041218: Optical observations
  68. GRB 041219 : optical follow-up observations
  69. GRB041220: Swift-BAT burst
  70. Deep RAPTOR observations during GRB 041219
  71. GRB 041218 Optical Observations
  72. GRB 041219 Optical Observations
  73. GRB041219c: Third Burst in One Day from Swift-BAT
  74. GRB041219: Optical Afterglow Detection
  75. GRB041219: Continued NIR Observations
  76. GRB041219b: A Swift-BAT burst
  77. GRB 041219 ,optical observation
  78. GRB 041219: Radio Afterglow Detection
  79. GRB 041218 : Radio Observations
  80. GRB 041218: R-band optical observations
  81. GRB041218: Liverpool Telescope optical observations
  82. GRB041218: optical observations
  83. GRB041219: Confirmed NIR Afterglow
  84. GRB041218: Continued P60 Optical Observations
  85. Swift-BAT detection of the bright long burst GRB041219
  86. GRB 041219: Infrared Afterglow Candidate
  87. GRB041219, BVRcIc field calibration
  88. GRB 041219: Infrared Afterglow Candidate
  89. GRB041218, BVRcIc field calibration
  90. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  91. GRB041219: P60 Optical Observations
  92. GRB 041219 - A long GRB detected by INTEGRAL
  93. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  94. GRB 041217: PROMPT Observations
  95. GRB041218: optical observations
  96. GRB 041218; optical candidate
  97. GRB 041218: Optical observations
  98. GRB 041217: LCO40 Optical Observations and Possible Candidates
  99. GRB 041218 - A long GRB detected by integral
  100. GRB041217: Optical Observations

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