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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"

23464 results found.

  1. GRB061217: Swift/UVOT refined analysis.
  2. GRB 061217: optical observations at Calar Alto
  3. GRB061217 - Swift/XRT refined analysis
  4. GRB 061217: Magellan Observations
  5. GRB 061217: REM prompt observations
  6. GRB 061217: ROTSE-III Optical Limits
  7. GRB 061217: Swift detection of a short hard burst
  8. GRB061210: Swift/UVOT observations
  9. GRB 061210: Swift XRT analysis - Possible counterparts
  10. GRB 061214(?): ROTSE-III Optical Limits
  11. GRB 061214(?): Swift detection of a possible burst
  12. GRB 061210: Gemini/GMOS Observations
  13. GRB 061126: Radio Observations
  14. GRB061210: Radio Observations
  15. GRB 061210, Swift-BAT refined analysis of the SHB
  16. GRB 061210: Swift-BAT detection of a short burst
  17. Optical Afterglow observations of GRB 061126
  18. GRB061126: update on the Swift-XRT afterglow light curve
  19. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  20. GRB 061202: TORTOREM optical upper limits
  21. GRB 061201: VLT optical decay
  22. GRB 061201: SOAR Confirmation of Candidate Afterglow
  23. GRB061202: FRAM early follow-up limit
  24. GRB061202 optical limit by "Pi of the Sky"
  25. Konus-Wind observation of GRB 061201
  26. GRB061202: optical/NIR observations with REM
  27. GRB061202: Swift/UVOT Upper Limits
  28. GRB 061202: Swift detection of a burst
  29. GRB 061201: VLT optical observations
  30. GRB 061201: Swift detection of a short hard burst
  31. GRB 061122: GETS observation
  32. GRB 061121, SMARTS optical/IR observations
  33. INT+WFC observations of GRB 061126
  34. GRB 061121: ATCA & WSRT Radio Observations
  35. GRB061121: optical observations
  36. GRB061126: Optical afterglow observations from MIRO
  37. GRB061126: Optical afterglow observations from MIRO
  38. GRB 061126 : SDSS Pre-Burst Observations
  39. GRB 061126: Swift-XRT refined analysis
  40. GRB 061126: Swift/UVOT Observations
  41. GRB 061126: SARA Observations
  42. GRB 061126: Early Detection of the IR Afterglow
  43. GRB 061126: Swift detection of a burst
  44. GRB061121: optical observations
  45. GRB 061122: Candidate Optical Afterglow
  46. GRB 061121: Ep,i - Eiso correlation
  47. GRB061122: Swift/UVOT Optical Observations
  48. GRB061121: P60 Observations
  49. Radio detection of GRB 061121
  50. GRB061122: Swift-XRT position
  51. RHESSI Spectrum of GRB061121
  52. Konus-Wind and Konus-A observations of GRB 061121
  53. Swift-BAT trigger 239987 is not a GRB
  54. GRB 061121: Swift/UVOT Observations
  55. GRB061121, optical observation
  56. GRB 061121: Optical observation at the KANATA 1.5m telescope
  57. GRB 061121: Swift detection of a bright burst with an optical counterpart
  58. GRB 060605: NIR Observations
  59. GRB 050915B: optical afterglow
  60. GRB 060111B: Swift UVOT Refined Magnitudes
  61. GRB 061110B: NIR Observations
  62. Swift/UVOT Upper Limits for GRB061110b
  63. Swift/UVOT Upper Limits for GRB061110a
  64. GRB061110B: Optical observations at Crni Vrh
  65. GRB 061110A: Swift XRT refined analysis
  66. GRB 061110B: Swift-UVOT Initial Observation
  67. GRB 061110B: TAROT Calern observatory optical observations
  68. GRB 061110B: Swift detection of a burst
  69. GRB 061110: Candidate confirmed
  70. GRB 061110: ROTSE-III Optical Limits
  71. GRB 061110: Swift detection of a burst
  72. GRB061110A - Optical Non-detection
  73. GRB 061109: TAROT Calern observatory optical observations
  74. GRB 061109: Swift detection of a possible burst
  75. GRB 061027: TAROT La Silla observatory optical observations
  76. GRB 061028: Swift/XRT Astrometry Correction
  77. GRB 061102: Swift/UVOT Magnitude Upper Limits
  78. GRB 061102, XRT refined analysis
  79. GRB 061004: Further VLT/NTT observations
  80. GRB061102B: Super-LOTIS observations
  81. GRB 061028: Optical R passband observations
  82. GRB 061102B: Swift detection of a possible burst
  83. GRB 061102: Swift detection of a burst
  84. GRB 061028: VLA Observation
  85. GRB 061004: Swift/XRT Astrometry Correction
  86. GRB 060801: Swift/XRT Astrometry Correction
  87. GRB 061028: Futher P200 Observations
  88. GRB 061028: P200 Observations
  89. GRB 061028: SARA upper limit
  90. GRB 061028: z band imaging
  91. GRB061028: XRT refined analysis
  92. GRB 061028: Swift/UVOT Observations
  93. GRB 061028: TAROT Calern observatory optical observations
  94. GRB 061028: Swift detection of a burst
  95. GRB 061027, Swift refined analysis of a possible burst
  96. GRB 061027: Swift detection of a possible burst
  97. GRB061025: Swift XRT refined analysis
  98. GRB061025: Swift/UVOT observations
  99. GRB 061019: MITSuME upper limits
  100. GRB 061025: REM observations

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