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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"

42297 results found.

  1. GRB 061126: Swift/UVOT Afterglow Detection
  2. GRB 061126: XRT position
  3. GRB 061126: Swift detection of a burst
  4. GRB 061122: Confirmation of X-ray/Optical Afterglow
  5. GRB 061121: MDM Continuing Optical Decay
  6. GRB061121: optical observations
  7. GRB 061122: Candidate Optical Afterglow
  8. GRB 061121: Ep,i - Eiso correlation
  9. GRB 061121: MDM Optical Decay
  10. GRB061122: Swift/UVOT Optical Observations
  11. GRB 061121: ART detection in Ic
  12. GRB061121: P60 Observations
  13. GRB061122: Swift-XRT position
  14. Konus-Wind observation of GRB 061122
  15. GRB 061121: MDM Optical Observations
  16. GRB 061121 declared "Burst of Interest" by Swift team
  17. RHESSI Spectrum of GRB061121
  18. Konus-Wind and Konus-A observations of GRB 061121
  19. GRB 061122A: a long GRB detected by INTEGRAL
  20. GRB 061121: Swift/UVOT Observations
  21. GRB 061121: Swift-XRT Team Refined Analysis
  22. GRB 061121, Swift-BAT refined analysis
  23. GRB061121, optical observation
  24. GRB 061121 : Planned XMM-Newton observation
  25. GRB 061121: Optical observation at the KANATA 1.5m telescope
  26. GRB 061121: Faulkes Telescope North Optical Observation
  27. GRB061121: Spectroscopic Redshift
  28. GRB061121: Keck spectroscopic observations
  29. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  30. GRB 061121: Swift detection of a bright burst with an optical counterpart
  31. GRB 060605: NIR Observations
  32. GRB 050915B: optical afterglow
  33. GRB 060111B: Swift UVOT Refined Magnitudes
  34. GRB061110A: Correction to GCN5817
  35. GRB 061110A: refined R-band analysis
  36. GRB 061110B: NIR Observations
  37. Swift TOO observations of GRB061110A
  38. Swift/UVOT Upper Limits for GRB061110b
  39. Swift/UVOT Upper Limits for GRB061110a
  40. GRB 061110A - VLT tentative redshift
  41. GRB 061110B: Swift XRT refined analysis
  42. GRB 061110B: VLT redshift
  43. GRB061110B: Optical observations at Crni Vrh
  44. GRB 061110B: NOT optical observations
  45. GRB 061110A: Swift XRT refined analysis
  46. GRB 061110B: Swift/XRT position
  47. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  48. GRB 061110B: Swift-UVOT Initial Observation
  49. GRB 061110B: TAROT Calern observatory optical observations
  50. GRB 061110B: Swift detection of a burst
  51. GRB 061110: NOT observations
  52. GRB 061110: Candidate confirmed
  53. GRB 061110 : Optical afterglow candidate
  54. GRB 061110: ROTSE-III Optical Limits
  55. GRB 061110: Swift detection of a burst
  56. GRB061110A - Optical Non-detection
  57. GRB 061109: optical observation
  58. GRB 061109: TAROT Calern observatory optical observations
  59. GRB 061109: Swift detection of a possible burst
  60. GRB 061027: TAROT La Silla observatory optical observations
  61. GRB 061007: Third Epoch ATCA Radio Observations
  62. GRB061019: second epoch CrAO observations
  63. GRB 061028: Swift/XRT Astrometry Correction
  64. GRB 061102: Swift/UVOT Magnitude Upper Limits
  65. GRB 061102, XRT refined analysis
  66. GRB 061004: Further VLT/NTT observations
  67. GRB061102B: Super-LOTIS observations
  68. GRB 061028: Optical R passband observations
  69. GRB 061102B: Swift detection of a possible burst
  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: TAROT Calern observatory late optical observations
  81. GRB 061028: TAROT Calern observatory optical observations
  82. GRB 061028: Swift detection of a burst
  83. GRB 061027, Swift refined analysis of a possible burst
  84. GRB 061027: Swift detection of a possible burst
  85. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  86. GRB061025: Swift XRT refined analysis
  87. GRB 061019: MITSuME upper limits
  88. GRB 061025: REM observations
  89. GRB 061025: Gemini-S observations
  90. GRB061025: Swift XRT position
  91. GRB 061025: ROTSE-III Optical Limits
  92. GRB 061025: a long GRB detected by INTEGRAL
  93. Swift XRT boresight update
  94. GRB 061021, Swift-BAT Lag analysis
  95. Konus-Wind observation of GRB 061021
  96. GRB 061021 - VLT spectrum without lines
  97. GRB 061021: Swift-XRT refined analysis
  98. GRB 061021: Swift/UVOT Observation
  99. GRB 061021: Swift detection of a burst
  100. GRB060904b: optical observations

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