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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"

21393 results found.

  1. GRB 060116: Swift-BAT detection of a burst
  2. GRB 060115: Refined analysis of the Swift-BAT burst
  3. GRB 060115: Swift/UVOT upper limits
  4. GRB 060115: Swift XRT refined analysis
  5. GRB 060115: OT finding chart
  6. GRB 060114: Swift/UVOT Observations
  7. GRB 060115: MITSuME optical afterglow candidate
  8. GRB 060115: Swift detection of a burst
  9. GRB 060114: Swift XRT upper limit
  10. GRB060108: Faulkes North afterglow evidence
  11. GRB 060108: Evidence for an XRT Position Offset
  12. GRB 060110: KAIT observations
  13. GRB 060111B: Swift XRT refined analysis
  14. GRB 060111A: refined UVOT anaysis
  15. GRB 060111B: TAROT optical observation
  16. GRB060111A: RTT150 optical observations
  17. GRB060111B: RTT150, possible host galaxy
  18. GRB 060111B: Refined analysis of the Swift-BAT burst
  19. GRB 060110: MARGE observations
  20. GRB 060111(a): P60 Observations
  21. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  22. GRB 060111B: Swift detection of a burst
  23. GRB 060111: Swift-BAT Refined Analysis
  24. GRB 060108: VLT K-band observations
  25. GRB 060111: TAROT optical observation
  26. GRB 060111: possible UVOT counterpart
  27. GRB060111 : XRT refined analysis
  28. GRB 060111: ROTSE-III Optical Limits
  29. GRB 060111: Swift detection of a burst
  30. GRB 060110: Swift-BAT refined analysis
  31. GRB 060109: Swift-BAT refined analysis
  32. GRB 060108: z-band imaging from Gemini-North
  33. GRB 060110a: RAPTOR detection of early optical emission.
  34. Correction to GRB 060109 XRT analysis
  35. GRB 060110: Swift-BAT detection of a burst
  36. GRB 060109: Refined Swift-XRT analysis
  37. GRB 060109: Swift/UVOT upper limits
  38. GRB 060108: ISAS early observations and near IR upper limit
  39. GRB060108: P200 Ks Observations
  40. GRB 060108: early UKIRT K-band observations
  41. Swift UVOT correction to GCN 4455
  42. GRB 060109: Swift Detection of a long burst
  43. GRB 060108: a dark burst?
  44. GRB 060108: Refined XRT analysis
  45. GRB 060108: VLT J-band observations
  46. GRB 060108: Mitsume optical observations
  47. GRB 060108: Swift/UVOT upper limits
  48. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  49. GRB060108: Faulkes Telescope observation
  50. GRB 060108: Refined analysis of the Swift-BAT burst
  51. GRB 060108: Swift XRT position
  52. GRB060108: Swift detection of its 100th GRB
  53. GRB 060105: Radio observations
  54. GRB 060105: MDM Observation
  55. Konus-Wind observation of GRB 060105
  56. GRB 060105: ISAS observations and near IR upper limit
  57. GRB 060105: Swift/UVOT upper limits
  58. GRB 060105: Mitsume optical observations
  59. GRB 060105: BAT refined analysis
  60. GRB 060102 - no XRT afterglow
  61. GRB 060105: XRT refined analysis
  62. GRB060105: Swift detection of a bright long burst
  63. Swift-BAT trigger 175653 is not an astrophysical source
  64. Swift-BAT trigger 175653 is probably not a GRB
  65. GRB 060102: Swift-BAT refined analysis
  66. Time Correction to GRB 060102
  67. GRB 060102: Swift-BAT detection of a burst
  68. GRB051211B: optical observations
  69. GRB051227: SARA Observations
  70. GRB 051221B: Optical Observations with Kuiper 1.54m
  71. GRB051221B: Radio observations
  72. GRB051227: Radio Observations
  73. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  74. GRB 051227: Gemini observations
  75. GRB 051227: Keck Spectroscopy
  76. GRB 051227: Magellan r'-band Imaging/Astrometry
  77. GRB 051227: refined analysis of VLT images
  78. GRB 051227: P60 Observations
  79. GRB 051227: MDM Observation
  80. GRB 051227: R-band object in the XRT error circle
  81. GRB 051227: Joint Swift-HETE Spectral Analysis
  82. GRB 051227: XRT refined analysis
  83. GRB 051227: Further analysis of the Swift-BAT burst
  84. GRB 051227: Refined analysis of the Swift-BAT burst
  85. GRB051227: SDSS pre-burst observations
  86. GRB 051227: Swift detection of a burst
  87. Konus-Wind observation of GRB 051221A
  88. GRB051221A: Suzaku WAM observation of the prompt emission
  89. GRB051016: analysis of the XMM-Newton observation
  90. GRB 051221A: Detection at 251nm with Swift UVOT
  91. GRB 051221A: Chandra Afterglow Position
  92. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  93. GRB 051221B: ROTSE-III Optical Limits
  94. GRB 051221B: TAROT optical limits
  95. GRB 051221A: WSRT Radio Observations
  96. GRB 051221B: Refined analysis of the Swift-BAT burst
  97. Possible GRB 051221B: MDM Optical Detection
  98. GRB 051221A: RAPTOR Fading Counterpart Constraint
  99. GRB 051221B: BOOTES optical observations.
  100. Possible GRB 051221B: Swift XRT position

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