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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"

43899 results found.

  1. GRB 061121: MDM Continued Monitoring
  2. GRB 061121: MDM Continuing Optical Decay
  3. GRB061121: optical observations
  4. GRB 061122: Candidate Optical Afterglow
  5. GRB 061121: Ep,i - Eiso correlation
  6. GRB 061121: MDM Optical Decay
  7. GRB061122: Swift/UVOT Optical Observations
  8. GRB 061121: ART detection in Ic
  9. GRB061121: P60 Observations
  10. Radio detection of GRB 061121
  11. GRB061122: Swift-XRT position
  12. Konus-Wind observation of GRB 061122
  13. GRB 061121: MDM Optical Observations
  14. GRB 061121 declared "Burst of Interest" by Swift team
  15. RHESSI Spectrum of GRB061121
  16. Konus-Wind and Konus-A observations of GRB 061121
  17. Swift-BAT trigger 239987 is not a GRB
  18. GRB 061122A: a long GRB detected by INTEGRAL
  19. GRB 061121: Swift/UVOT Observations
  20. GRB 061121: Swift-XRT Team Refined Analysis
  21. GRB 061121, Swift-BAT refined analysis
  22. GRB 061121 : Planned XMM-Newton observation
  23. GRB 061121: Optical observation at the KANATA 1.5m telescope
  24. GRB 061121: Faulkes Telescope North Optical Observation
  25. GRB061121: Spectroscopic Redshift
  26. GRB061121: Keck spectroscopic observations
  27. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  28. GRB 061121: Swift detection of a bright burst with an optical counterpart
  29. GRB 060605: NIR Observations
  30. GRB 050915B: optical afterglow
  31. Swift-BAT triggers 238544 and 238546 are not GRBs
  32. GRB 061110A: refined R-band analysis
  33. GRB 061110B: NIR Observations
  34. Swift TOO observations of GRB061110A
  35. GRB 061110A - VLT tentative redshift
  36. GRB 061110B: Swift XRT refined analysis
  37. GRB 061110B, Swift-BAT refined analysis
  38. GRB 061110B: VLT redshift
  39. GRB061110B: Optical observations at Crni Vrh
  40. GRB 061110B: NOT optical observations
  41. GRB 061110A: Swift XRT refined analysis
  42. GRB 061110B: Swift/XRT position
  43. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  44. GRB 061110B: Swift-UVOT Initial Observation
  45. GRB 061110A, Swift-BAT refined analysis
  46. GRB 061110B: TAROT Calern observatory optical observations
  47. GRB 061110B: Swift detection of a burst
  48. GRB 061110: NOT observations
  49. GRB 061110: Candidate confirmed
  50. GRB 061110 : Optical afterglow candidate
  51. GRB 061110: ROTSE-III Optical Limits
  52. GRB 061110: Swift detection of a burst
  53. GRB061110A - Optical Non-detection
  54. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  55. GRB 061109: optical observation
  56. GRB 061109: TAROT Calern observatory optical observations
  57. GRB 061109: Swift detection of a possible burst
  58. GRB061028: MAGIC telescope GeV observation
  59. GRB 061027: TAROT La Silla observatory optical observations
  60. GRB 061007: Third Epoch ATCA Radio Observations
  61. GRB061019: second epoch CrAO observations
  62. GRB 061028: Swift/XRT Astrometry Correction
  63. GRB 061102, XRT refined analysis
  64. GRB 061004: Further VLT/NTT observations
  65. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  66. GRB061102B: Super-LOTIS observations
  67. GRB 061028: Optical R passband observations
  68. GRB 061102B: Swift detection of a possible burst
  69. GRB 061102, Swift-BAT refined analysis
  70. GRB 061102: Swift detection of a burst
  71. GRB 061028: VLA Observation
  72. GRB 061004: Swift/XRT Astrometry Correction
  73. GRB 060801: Swift/XRT Astrometry Correction
  74. GRB 061028: Futher P200 Observations
  75. GRB 061028: MDM Observations
  76. GRB 061028: P200 Observations
  77. GRB 061028: SARA upper limit
  78. GRB 061028: z band imaging
  79. GRB061028: XRT refined analysis
  80. GRB 061028, Swift-BAT refined analysis
  81. GRB 061028: TAROT Calern observatory late optical observations
  82. GRB 061028: TAROT Calern observatory optical observations
  83. GRB 061028: Swift detection of a burst
  84. GRB 061027, Swift refined analysis of a possible burst
  85. GRB 061027: Swift detection of a possible burst
  86. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  87. GRB061025: Swift XRT refined analysis
  88. GRB061025: Swift/UVOT observations
  89. GRB 061025: REM observations
  90. GRB 061025: Gemini-S observations
  91. GRB061025: Swift XRT position
  92. GRB 061025: ROTSE-III Optical Limits
  93. GRB 061025: a long GRB detected by INTEGRAL
  94. Swift XRT boresight update
  95. GRB 061021, Swift-BAT Lag analysis
  96. Konus-Wind observation of GRB 061021
  97. GRB 061021 - VLT spectrum without lines
  98. GRB 061021: Swift-XRT refined analysis
  99. GRB 061021: Swift/UVOT Observation
  100. GRB 061021, Swift-BAT refined analysis

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