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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"

20519 results found.

  1. GRB 061210: Swift-BAT detection of a short burst
  2. Optical Afterglow observations of GRB 061126
  3. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  4. GRB 061202: TORTOREM optical upper limits
  5. GRB 061201: VLT optical decay
  6. GRB 061201: SOAR Confirmation of Candidate Afterglow
  7. GRB061202: FRAM early follow-up limit
  8. GRB061202 optical limit by "Pi of the Sky"
  9. GRB061202: optical/NIR observations with REM
  10. GRB061202: Swift/UVOT Upper Limits
  11. GRB 061202: Swift detection of a burst
  12. GRB 061201: Swift XRT Team refined analysis
  13. GRB 061201: VLT optical observations
  14. INT+WFC observations of GRB 061126
  15. GRB 061126: Possible Jet Break
  16. GRB061126: Optical afterglow observations from MIRO
  17. GRB061126: Optical afterglow observations from MIRO
  18. GRB 061126 : SDSS Pre-Burst Observations
  19. GRB 061126: Swift/UVOT Observations
  20. GRB 061126: Early Detection of the IR Afterglow
  21. GRB 061122: Candidate Optical Afterglow
  22. GRB061122: Swift/UVOT Optical Observations
  23. GRB061121: P60 Observations
  24. Radio detection of GRB 061121
  25. GRB061122: Swift-XRT position
  26. Swift-BAT trigger 239987 is not a GRB
  27. GRB 061121: Swift/UVOT Observations
  28. GRB061121, optical observation
  29. GRB 061121: Optical observation at the KANATA 1.5m telescope
  30. GRB 061121: Faulkes Telescope North Optical Observation
  31. GRB 061121: Swift detection of a bright burst with an optical counterpart
  32. GRB 060605: NIR Observations
  33. GRB 050915B: optical afterglow
  34. Swift/UVOT Upper Limits for GRB061110b
  35. Swift/UVOT Upper Limits for GRB061110a
  36. GRB 061110B: Swift XRT refined analysis
  37. GRB061110B: Optical observations at Crni Vrh
  38. GRB 061110B: TAROT Calern observatory optical observations
  39. GRB 061110B: Swift detection of a burst
  40. GRB 061110: Candidate confirmed
  41. GRB 061110: ROTSE-III Optical Limits
  42. GRB 061110: Swift detection of a burst
  43. GRB061110A - Optical Non-detection
  44. GRB 061109: TAROT Calern observatory optical observations
  45. GRB 061027: TAROT La Silla observatory optical observations
  46. GRB 061028: Swift/XRT Astrometry Correction
  47. GRB 061102: Swift/UVOT Magnitude Upper Limits
  48. GRB 061102, XRT refined analysis
  49. GRB061102B: Super-LOTIS observations
  50. GRB 061028: Optical R passband observations
  51. GRB 061102B: Swift detection of a possible burst
  52. GRB 061102: Swift detection of a burst
  53. GRB 061028: VLA Observation
  54. GRB 061004: Swift/XRT Astrometry Correction
  55. GRB 060801: Swift/XRT Astrometry Correction
  56. GRB 061028: Futher P200 Observations
  57. GRB 061028: P200 Observations
  58. GRB 061028: SARA upper limit
  59. GRB 061028: z band imaging
  60. GRB061028: XRT refined analysis
  61. GRB 061028: Swift/UVOT Observations
  62. GRB 061028: TAROT Calern observatory optical observations
  63. GRB 061028: Swift detection of a burst
  64. GRB 061027, Swift refined analysis of a possible burst
  65. GRB 061027: Swift detection of a possible burst
  66. GRB061025: Swift XRT refined analysis
  67. GRB061025: Swift/UVOT observations
  68. GRB 061025: REM observations
  69. GRB 061025: ROTSE-III Optical Limits
  70. Swift XRT boresight update
  71. GRB 061021: Swift/UVOT Observation
  72. GRB 061021: Swift detection of a burst
  73. GRB 061019: Super-LOTIS upper limit
  74. GRB060904b: optical observations
  75. GRB 061019: SARA upper limit
  76. GRB 061019: Swift/UVOT upper limit
  77. GRB061019: Swift XRT refined analysis
  78. GRB 061019, Swift-BAT refined analysis
  79. GRB 061019: TAROT La Silla observatory optical observations
  80. GRB 061019: REM K-band candidate afterglow
  81. GRB 061007: RHESSI Spectral Fit
  82. GRB 061007: Suzaku/WAM observation of the prompt emission
  83. GRB 061006: astrometry-corrected XRT position
  84. Konus-Wind observation of GRB 061007
  85. GRB061007: Swift UVOT followup observations
  86. GRB 061006: optical afterglow
  87. GRB 061007: OA fading and VLT redshift
  88. GRB 061007: Swift XRT refined analysis
  89. GRB 061006: Swift/UVOT optical observations
  90. GRB 061007: Swift detection of a burst with an optical counterpart
  91. GRB 061006: VLT observation
  92. GRB 061006: Swift-XRT Team Refined Analysis
  93. GRB 060930: near-IR afterglow candidate retraction
  94. GRB 061004: Optical afterglow candidate and redshift
  95. GRB 061004: Swift detection of a burst
  96. Konus-Wind observation of GRB 060928
  97. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  98. GRB 060928: Swift observations
  99. GRB 060928: RHESSI Spectral Fit
  100. IPN triangulation of GRB060928 (long, exceptionally bright)

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