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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

38178 results found.

  1. GRB 061218: TAROT La Silla observatory optical observations
  2. GRB 061217: TAROT Calern observatory optical observations
  3. GRB 061218: TORTOREM optical upper limits
  4. GRB 061218, Swift-BAT refined analysis
  5. GRB 061218, SMARTS optical/IR observations
  6. GRB 061218: REM prompt observations
  7. Swift triggers (#251863) on a possible burst
  8. GRB 061217, SMARTS optical observations
  9. GRB061217: Swift/UVOT refined analysis.
  10. GRB 061217: optical observations at Calar Alto
  11. GRB061217 - Swift/XRT refined analysis
  12. GRB 061217, Further Swift-BAT refined analysis of the short hard burst
  13. GRB 061217, Swift-BAT refined analysis
  14. GRB 061217: Magellan Observations
  15. GRB 061217: REM prompt observations
  16. GRB 061217: ROTSE-III Optical Limits
  17. GRB 061217: Swift detection of a short hard burst
  18. GRB 061210: MDM Follow-up Observation
  19. Swift-BAT Trigger 250908 is a Cosmic Ray Shower event
  20. GRB 061210: Optical sources near XRT positions
  21. GRB 061210: Swift XRT analysis - Possible counterparts
  22. GRB 061210 : Faulkes North Telescope optical limit
  23. GRB 061214(?): ROTSE-III Optical Limits
  24. GRB 061214(?): Swift detection of a possible burst
  25. GRB 061210: Suzaku WAM observation of the prompt emission
  26. GRB 061213: MASTER-VWF-Kislovodsk OT candidate retraction
  27. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  28. GRB 061213: MASTER-VWF-Kislovodsk observations
  29. GRB 061210: Gemini/GMOS Observations
  30. GRB 061126: Radio Observations
  31. GRB061210: Radio Observations
  32. GRB 061126: a GRB detected off-axis by INTEGRAL
  33. GRB 061202: Suzaku WAM observation of the prompt emission
  34. GRB 061210: MDM Observation
  35. GRB 061210, Swift-BAT refined analysis of the SHB
  36. GRB 061210: Swift-BAT detection of a short burst
  37. Optical Afterglow observations of GRB 061126
  38. GRB061126: optical observations
  39. GRB 060926: MASTER: discovery of the optical flare
  40. Corrections for Swift/UVOT Exposure Times for GRBs 061110B and 061121
  41. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  42. GRB 061202: TORTOREM optical upper limits
  43. GRB 061201: VLT optical decay
  44. GRB 061201: SOAR Confirmation of Candidate Afterglow
  45. GRB 061202: Swift XRT refined analysis
  46. GRB061202: FRAM early follow-up limit
  47. GRB061202 optical limit by "Pi of the Sky"
  48. Konus-Wind observation of GRB 061201
  49. GRB061202: optical/NIR observations with REM
  50. GRB061202: Swift/UVOT Upper Limits
  51. GRB 061202, Swift-BAT refined analysis
  52. GRB 061202: Swift detection of a burst
  53. GRB 061201: Swift XRT Team refined analysis
  54. GRB 061201: VLT optical observations
  55. GRB 061201: Initial UVOT Observations
  56. GRB 061201, Swift-BAT refined analysis of the SHB
  57. GRB 061201: Swift detection of a short hard burst
  58. GRB 061201: Coincidence with a Galaxy Cluster
  59. GRB 061122: GETS observation
  60. GRB 061121, SMARTS optical/IR observations
  61. GRB 061121: flattening of the decay
  62. INT+WFC observations of GRB 061126
  63. GRB 061126: Possible Jet Break
  64. GRB 061121: Second Epoch ATCA Radio Observations
  65. GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission
  66. GRB 061121: ATCA & WSRT Radio Observations
  67. GRB061121: optical observations
  68. GRB 061126: Early Super-LOTIS Observations
  69. GRB 061126: optical observation
  70. GRB 061126: Tautenburg afterglow observations
  71. GRB 061126 : SDSS Pre-Burst Observations
  72. GRB 061126: Swift-XRT refined analysis
  73. GRB 061126: Swift/UVOT Observations
  74. GRB 061126, Swift-BAT refined analysis
  75. GRB 061126: SARA Observations
  76. GRB 061126: Early Detection of the IR Afterglow
  77. GRB 061126: Faulkes Telescope North Optical Observations
  78. GRB 061126: Swift/UVOT Afterglow Detection
  79. GRB 061126: XRT position
  80. GRB 061126: Swift detection of a burst
  81. GRB 061121: MDM Continued Monitoring
  82. GRB 061122: Confirmation of X-ray/Optical Afterglow
  83. GRB 061121: MDM Continuing Optical Decay
  84. GRB061121: optical observations
  85. GRB 061122: Candidate Optical Afterglow
  86. GRB 061121: Ep,i - Eiso correlation
  87. GRB 061121: MDM Optical Decay
  88. GRB061122: Swift/UVOT Optical Observations
  89. GRB 061121: ART detection in Ic
  90. GRB061121: P60 Observations
  91. Radio detection of GRB 061121
  92. GRB061122: Swift-XRT position
  93. Konus-Wind observation of GRB 061122
  94. GRB 061121: MDM Optical Observations
  95. GRB 061121 declared "Burst of Interest" by Swift team
  96. Konus-Wind and Konus-A observations of GRB 061121
  97. INTEGRAL results on GRB 061122
  98. Swift-BAT trigger 239987 is not a GRB
  99. GRB 061122A: a long GRB detected by INTEGRAL
  100. GRB 061121: Swift/UVOT Observations

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