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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"

28114 results found.

  1. erratum : SDSS Pre-burst Observations of GRB061126
  2. GRB 061210: Swift/XRT Astrometry Correction
  3. GRB 050826: MDM Redshift
  4. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  5. GRB 061222A: Xinglong Optical Limit
  6. GRB 061222A: Gemini Afterglow Candidate
  7. GRB 061222B, Swift-BAT refined analysis
  8. GRB061222A Swift/UVOT: Upper Limits
  9. GRB 061222B: Swift/UVOT Upper limits
  10. GRB 061222B: Observation with the KANATA 1.5m telescope
  11. GRB 061222A: Observation with the KANATA 1.5m telescope
  12. GRB 061222B: BOOTES-IR optical observations
  13. GRB 061222B: SARA upper limit
  14. GRB 061217: Magellan host galaxy redshift
  15. GRB 061222A, Swift-BAT refined analysis
  16. GRB 061222B: REM NIR/optical observations
  17. GRB 061222B: TAROT La Silla observatory optical observations
  18. GRB 061222B: Swift detection of a burst
  19. GRB 061222b: optical afterglow
  20. GRB 061222A: Prompt ROTSE-III Optical Limits
  21. GRB 061222: Swift detection of a burst
  22. GRB 061218: TAROT La Silla observatory optical observations
  23. GRB 061217: TAROT Calern observatory optical observations
  24. GRB 061218: TORTOREM optical upper limits
  25. GRB 061218, Swift-BAT refined analysis
  26. GRB061217: VLT NIR observations
  27. GRB 061218, SMARTS optical/IR observations
  28. GRB 061218: REM prompt observations
  29. Swift triggers (#251863) on a possible burst
  30. GRB061217: Swift/UVOT refined analysis.
  31. GRB 061217: optical observations at Calar Alto
  32. GRB061217 - Swift/XRT refined analysis
  33. GRB 061217, Swift-BAT refined analysis
  34. GRB 061217: Magellan Observations
  35. GRB 061217: REM prompt observations
  36. GRB 061217: ROTSE-III Optical Limits
  37. GRB061210: Swift/UVOT observations
  38. GRB 061210: Swift XRT analysis - Possible counterparts
  39. GRB 061210: Gemini/GMOS Observations
  40. GRB 061126: Radio Observations
  41. GRB061210: Radio Observations
  42. GRB 061202: Suzaku WAM observation of the prompt emission
  43. GRB 061210, Swift-BAT refined analysis of the SHB
  44. Optical Afterglow observations of GRB 061126
  45. GRB 060926: MASTER: discovery of the optical flare
  46. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  47. GRB 061202: TORTOREM optical upper limits
  48. GRB 061201: VLT optical decay
  49. GRB 061201: SOAR Confirmation of Candidate Afterglow
  50. GRB061202: FRAM early follow-up limit
  51. GRB061202 optical limit by "Pi of the Sky"
  52. GRB061202: optical/NIR observations with REM
  53. GRB061202: Swift/UVOT Upper Limits
  54. GRB 061202, Swift-BAT refined analysis
  55. GRB 061202: Swift detection of a burst
  56. GRB 061201: VLT optical observations
  57. GRB 061201: Initial UVOT Observations
  58. GRB 061201, Swift-BAT refined analysis of the SHB
  59. GRB 061201: Swift detection of a short hard burst
  60. INT+WFC observations of GRB 061126
  61. Swift XRT on-board boresight update
  62. GRB 061126: optical observation
  63. GRB 061126: Tautenburg afterglow observations
  64. GRB061126: Optical afterglow observations from MIRO
  65. GRB061126: Optical afterglow observations from MIRO
  66. GRB 061126 : SDSS Pre-Burst Observations
  67. GRB 061126: Swift-XRT refined analysis
  68. GRB 061126: Swift/UVOT Observations
  69. GRB 061126, Swift-BAT refined analysis
  70. GRB 061126: Early Detection of the IR Afterglow
  71. GRB 061126: Swift/UVOT Afterglow Detection
  72. GRB 061122: Candidate Optical Afterglow
  73. GRB 061121: Ep,i - Eiso correlation
  74. GRB061122: Swift/UVOT Optical Observations
  75. GRB061121: P60 Observations
  76. Radio detection of GRB 061121
  77. GRB061122: Swift-XRT position
  78. INTEGRAL results on GRB 061122
  79. Swift-BAT trigger 239987 is not a GRB
  80. GRB 061121: Swift/UVOT Observations
  81. GRB 061121: Swift-XRT Team Refined Analysis
  82. GRB 061121, Swift-BAT refined analysis
  83. GRB061121, optical observation
  84. GRB 061121: Optical observation at the KANATA 1.5m telescope
  85. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  86. GRB 061121: Swift detection of a bright burst with an optical counterpart
  87. GRB 060605: NIR Observations
  88. GRB 050915B: optical afterglow
  89. Swift-BAT triggers 238544 and 238546 are not GRBs
  90. Swift/UVOT Upper Limits for GRB061110b
  91. Swift/UVOT Upper Limits for GRB061110a
  92. GRB 061110B, Swift-BAT refined analysis
  93. GRB061110B: Optical observations at Crni Vrh
  94. GRB 061110A: Swift XRT refined analysis
  95. GRB 061110A, Swift-BAT refined analysis
  96. GRB 061110B: TAROT Calern observatory optical observations
  97. GRB 061110B: Swift detection of a burst
  98. GRB 061110: Candidate confirmed
  99. GRB 061110 : Optical afterglow candidate
  100. GRB 061110: ROTSE-III Optical Limits

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