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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"

16026 results found.

  1. GRB 050826: MDM Redshift
  2. GRB 061222B: TAROT La Silla observatory early optical observations
  3. GRB 061218: TAROT La Silla observatory early optical observations
  4. GRB 061222A: MITSuME Akeno optical upper limits
  5. GRB 061222B: MITSuME Akeno optical upper limits
  6. GRB 061222A: Xinglong Optical Limit
  7. GRB061222A Swift/UVOT: Upper Limits
  8. GRB 061222B: Observation with the KANATA 1.5m telescope
  9. GRB061222B: Swift-XRT Refined Analysis
  10. GRB 061222A: Observation with the KANATA 1.5m telescope
  11. GRB 061222B: BOOTES-IR optical observations
  12. GRB 061222B: REM NIR/optical observations
  13. GRB 061222b, SMARTS optical/IR afterglow observations
  14. GRB 061222B: TAROT La Silla observatory optical observations
  15. GRB 061222b: optical afterglow
  16. GRB 061222A: Prompt ROTSE-III Optical Limits
  17. GRB 061217: Astrometry-Corrected XRT Position
  18. GRB 061201: Magellan redshift of nearby galaxy
  19. GRB 061217, Candidate host galaxy
  20. GRB 061218: TAROT La Silla observatory optical observations
  21. GRB 061217: TAROT Calern observatory optical observations
  22. GRB 061218: TORTOREM optical upper limits
  23. GRB 061218, SMARTS optical/IR observations
  24. GRB 061218: REM prompt observations
  25. GRB 061217, SMARTS optical observations
  26. GRB061217: Swift/UVOT refined analysis.
  27. GRB 061217: optical observations at Calar Alto
  28. GRB 061217: REM prompt observations
  29. GRB 061217: ROTSE-III Optical Limits
  30. GRB 061210: MDM Follow-up Observation
  31. GRB061210: Swift/UVOT observations
  32. GRB 061210: Optical sources near XRT positions
  33. GRB 061210 : Faulkes North Telescope optical limit
  34. GRB 061214(?): ROTSE-III Optical Limits
  35. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  36. GRB061201, VLT optical decay: correction
  37. Optical Afterglow observations of GRB 061126
  38. GRB061126: optical observations
  39. GRB 060926: MASTER: discovery of the optical flare
  40. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  41. GRB 061202: TORTOREM optical upper limits
  42. GRB 061201: VLT optical decay
  43. GRB061126 : NMSU 1.0m observations
  44. GRB061202 optical limit by "Pi of the Sky"
  45. GRB061202: optical/NIR observations with REM
  46. GRB 061201: Swift XRT Team refined analysis
  47. GRB 061201: VLT optical observations
  48. GRB 061201: Initial UVOT Observations
  49. GRB 061122: GETS observation
  50. GRB 061121, SMARTS optical/IR observations
  51. INT+WFC observations of GRB 061126
  52. GRB 061121: Second Epoch ATCA Radio Observations
  53. GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission
  54. GRB 061121: ATCA & WSRT Radio Observations
  55. GRB061121: optical observations
  56. GRB 061126: Early Super-LOTIS Observations
  57. GRB 061126: optical observation
  58. GRB061126: Optical afterglow observations from MIRO
  59. GRB061126: Optical afterglow observations from MIRO
  60. GRB 061126: Swift/UVOT Observations
  61. GRB 061126: Early Detection of the IR Afterglow
  62. GRB 061126: Faulkes Telescope North Optical Observations
  63. GRB 061122: Confirmation of X-ray/Optical Afterglow
  64. GRB 061121: MDM Continuing Optical Decay
  65. GRB061121: optical observations
  66. GRB 061122: Candidate Optical Afterglow
  67. GRB 061121: MDM Optical Decay
  68. GRB061122: Swift/UVOT Optical Observations
  69. GRB 061121: ART detection in Ic
  70. GRB 061121: MDM Optical Observations
  71. GRB 061121 declared "Burst of Interest" by Swift team
  72. GRB 061121: Swift/UVOT Observations
  73. GRB061121, optical observation
  74. GRB 061121: Optical observation at the KANATA 1.5m telescope
  75. GRB 061121: Faulkes Telescope North Optical Observation
  76. GRB061121: Spectroscopic Redshift
  77. GRB061121: Keck spectroscopic observations
  78. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  79. GRB 061121: Swift detection of a bright burst with an optical counterpart
  80. GRB 060605: NIR Observations
  81. GRB 050915B: optical afterglow
  82. GRB 061110B: Swift XRT refined analysis
  83. GRB061110B: Optical observations at Crni Vrh
  84. GRB 061110B: NOT optical observations
  85. GRB 061110A: Swift XRT refined analysis
  86. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  87. GRB 061110B: TAROT Calern observatory optical observations
  88. GRB 061110: NOT observations
  89. GRB 061110 : Optical afterglow candidate
  90. GRB 061110: ROTSE-III Optical Limits
  91. GRB061110A - Optical Non-detection
  92. GRB 061109: optical observation
  93. GRB 061109: TAROT Calern observatory optical observations
  94. GRB 061027: TAROT La Silla observatory optical observations
  95. GRB 061007: Third Epoch ATCA Radio Observations
  96. GRB061019: second epoch CrAO observations
  97. GRB 061028: Swift/XRT Astrometry Correction
  98. GRB 061102: Swift/UVOT Magnitude Upper Limits
  99. GRB 061004: Further VLT/NTT observations
  100. GRB 061028: Optical R passband observations

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