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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"

42960 results found.

  1. GRB 060111B: TAROT optical observation
  2. GRB060111B: RTT150, possible host galaxy
  3. GRB 060111B: Refined analysis of the Swift-BAT burst
  4. GRB 060110: MARGE observations
  5. GRB 060111(a): P60 Observations
  6. GRB 060111B: Gualba observatory limit
  7. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  8. GRB 060111B: Swift detection of a burst
  9. GRB 060111: Swift-BAT Refined Analysis
  10. GRB 060108: VLT K-band observations
  11. GRB 060111: TAROT optical observation
  12. GRB060111 : XRT refined analysis
  13. GRB 060111: ROTSE-III Optical Limits
  14. GRB 060111: Swift detection of a burst
  15. GRB 060110: Mitsume optical observations
  16. GRB 060109: Swift-BAT refined analysis
  17. GRB 060108: z-band imaging from Gemini-North
  18. GRB 060110: UKIRT K-band observations
  19. GRB 060110: IR Candidate Afterglow
  20. GRB 060110: Super-LOTIS observations
  21. GRB 060110: Optical observation
  22. GRB 060110: Correction
  23. Correction to GRB 060109 XRT analysis
  24. GRB 060110: Optical limit
  25. GRB 060110: Swift-BAT detection of a burst
  26. GRB 060109: Refined Swift-XRT analysis
  27. GRB 060108: ISAS early observations and near IR upper limit
  28. GRB060108: P200 Ks Observations
  29. GRB 060109: Swift Detection of a long burst
  30. GRB 060108: a dark burst?
  31. GRB 060108: Refined XRT analysis
  32. GRB 060108: VLT J-band observations
  33. GRB 060108: Mitsume optical observations
  34. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  35. GRB060108: SDSS pre-burst observations
  36. GRB 060108: Refined analysis of the Swift-BAT burst
  37. GRB 060108: Swift XRT position
  38. GRB060108: Swift detection of its 100th GRB
  39. Konus-Wind observation of GRB 060105
  40. GRB 060105: ISAS observations and near IR upper limit
  41. GRB 060105: Swift/UVOT upper limits
  42. GRB 060105: Mitsume optical observations
  43. GRB 060105: BAT refined analysis
  44. GRB 060102 - no XRT afterglow
  45. GRB 060105: XRT refined analysis
  46. GRB060105: Suzaku-XIS and -HXD observation plan
  47. GRB060105: Swift detection of a bright long burst
  48. Swift-BAT trigger 175653 is not an astrophysical source
  49. GRB 060102: MDM Observation
  50. Swift-BAT trigger 175653 is probably not a GRB
  51. GRB 060102: Swift-BAT detection of a burst
  52. GRB051211B: optical observations
  53. GRB051227: SARA Observations
  54. GRB 051227: Likely host galaxy underlying afterglow position
  55. GRB 051227: optical observation
  56. GRB 051221A: VLA Radio Observations
  57. GRB051227: Radio Observations
  58. GRB 051227: Confirmed fading from Gemini observations
  59. GRB051227: further analysis of VLT images
  60. GRB 051227: optical afterglow
  61. GRB 051227: Gemini observations
  62. GRB 051227: Keck Spectroscopy
  63. GRB 051227: Magellan r'-band Imaging/Astrometry
  64. GRB 051227: refined analysis of VLT images
  65. GRB 051227: P60 Observations
  66. GRB 051227: R-band object in the XRT error circle
  67. GRB 051227: Joint Swift-HETE Spectral Analysis
  68. GRB 051227: XRT refined analysis
  69. GRB 051227: Further analysis of the Swift-BAT burst
  70. GRB 051227: Refined analysis of the Swift-BAT burst
  71. GRB051227: SDSS pre-burst observations
  72. GRB 051227: Swift detection of a burst
  73. GRB051117B: optical observation
  74. IBAS_alert n. 2719 : not a real GRB
  75. Konus-Wind observation of GRB 051221A
  76. GRB051221A: Suzaku WAM observation of the prompt emission
  77. GRB 051221A: MDM Optical Observations
  78. GRB051016: analysis of the XMM-Newton observation
  79. GRB 051221A: Detection at 251nm with Swift UVOT
  80. GRB 051221A: Chandra Afterglow Position
  81. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  82. GRB 051221B: ROTSE-III Optical Limits
  83. GRB 051221B: TAROT optical limits
  84. GRB 051221A: WSRT Radio Observations
  85. GRB 051221: Redshift from Gemini
  86. GRB 051221: Continued fading of optical afterglow
  87. GRB 051221A: RAPTOR Fading Counterpart Constraint
  88. GRB 051221B: BOOTES optical observations.
  89. Possible GRB 051221B: Swift XRT position
  90. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  91. Swift-BAT detection of a possible burst
  92. GRB 051221: Discovery of fading optical afterglow
  93. GRB 051221: Swift XRT refined analysis
  94. GRB 051221: Possible nearby cluster
  95. GRB 051221: No variability in Gemini data
  96. GRB 051221: Correction to GCN #4368
  97. GRB 051221: Improved astrometry of the IR counterpart
  98. GRB051221: K-band source
  99. GRB 051221: XRT position
  100. GRB 051221: Refined analysis of the Swift-BAT short hard burst

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