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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"

26497 results found.

  1. GRB 060121 (=H4010): Results of preliminary spectral analysis
  2. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  3. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  4. HETE Alert 4006: MASTER promt optical limit
  5. GRB060117 - ATCA 3/6cm radio limits - correction
  6. GRB060117 - ATCA 3/6cm radio limits
  7. GRB 060116: UKIRT IR Observations
  8. GRB 060117: FRAM optical afterglow candidate
  9. GRB 060117: nearby galaxy
  10. GRB 060116: VLT optical observations
  11. GRB 060116: XRT refined analysis
  12. GRB 060116: IR Candidate Afterglow
  13. GRB 060116: Swift/UVOT upper limits
  14. GRB060115: REM observations
  15. GRB 060110: XRT position and analysis
  16. GRB060116: Faulkes North observation
  17. GRB 060116: Swift-BAT detection of a burst
  18. GRB 060115: Swift/UVOT upper limits
  19. GRB 060114: REM observations
  20. GRB 060115: Swift XRT refined analysis
  21. GRB 060114: Swift/UVOT Observations
  22. GRB060115, optical observation
  23. GRB 060115: MITSuME optical afterglow candidate
  24. GRB 060115: Swift detection of a burst
  25. GRB 060114: Swift XRT upper limit
  26. GRB060114, optical observation
  27. GRB 060114: refined position
  28. GRB060114: Faulkes North observation
  29. GRB 060108: IR observations of afterglow
  30. GRB060108: Faulkes North afterglow evidence
  31. GRB 060108: Evidence for an XRT Position Offset
  32. GRB 060110: KAIT observations
  33. GRB 060111B: Swift XRT refined analysis
  34. GRB 060111B: MITSuME detection of optical afterglow
  35. GRB 060111B: TAROT optical observation
  36. GRB060111A: RTT150 optical observations
  37. GRB060111B: RTT150, possible host galaxy
  38. GRB 060111B: Refined analysis of the Swift-BAT burst
  39. GRB 060111(a): P60 Observations
  40. GRB 060111B: Gualba observatory limit
  41. GRB 060111B: Swift detection of a burst
  42. GRB 060108: VLT K-band observations
  43. GRB 060111: TAROT optical observation
  44. GRB060111 : XRT refined analysis
  45. GRB 060111: Swift detection of a burst
  46. GRB 060110: Mitsume optical observations
  47. GRB 060110: Swift-BAT refined analysis
  48. GRB 060109: Swift-BAT refined analysis
  49. GRB 060108: z-band imaging from Gemini-North
  50. GRB 060110a: RAPTOR detection of early optical emission.
  51. GRB 060110: UKIRT K-band observations
  52. GRB 060110: IR Candidate Afterglow
  53. GRB060110, optical observation
  54. GRB 060110: Optical observation
  55. GRB 060110: Correction
  56. Correction to GRB 060109 XRT analysis
  57. GRB 050110: IR Observations
  58. GRB 060110: Swift-BAT detection of a burst
  59. GRB 060109: Refined Swift-XRT analysis
  60. GRB 060109: Swift/UVOT upper limits
  61. GRB060109, optical observation
  62. GRB 060108: ISAS early observations and near IR upper limit
  63. GRB060108: P200 Ks Observations
  64. GRB 060108: early UKIRT K-band observations
  65. GRB 060108: Refined XRT analysis
  66. GRB 060108: VLT J-band observations
  67. GRB 060108: Mitsume optical observations
  68. GRB 060108: Swift/UVOT upper limits
  69. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  70. GRB060108: SDSS pre-burst observations
  71. GRB060108: Faulkes Telescope observation
  72. GRB060108, optical observation
  73. GRB060108: Swift detection of its 100th GRB
  74. Konus-Wind observation of GRB 060105
  75. GRB 060105: ISAS observations and near IR upper limit
  76. GRB 060105: Swift/UVOT upper limits
  77. GRB 060105: Mitsume optical observations
  78. GRB 060102 - no XRT afterglow
  79. GRB 060105: XRT refined analysis
  80. GRB060105: Suzaku-XIS and -HXD observation plan
  81. GRB060105, optical observation
  82. GRB060105: Swift detection of a bright long burst
  83. Swift-BAT trigger 175653 is probably not a GRB
  84. GRB 060102: Swift-BAT refined analysis
  85. Time Correction to GRB 060102
  86. GRB 051221B: Optical Observations with Kuiper 1.54m
  87. GRB 051227: Likely host galaxy underlying afterglow position
  88. GRB 051227: optical observation
  89. GRB 051227: optical afterglow
  90. GRB 051227: Magellan r'-band Imaging/Astrometry
  91. GRB 051227: refined analysis of VLT images
  92. GRB 051227: P60 Observations
  93. GRB 051227: MDM Observation
  94. GRB 051227: R-band object in the XRT error circle
  95. GRB 051227: Joint Swift-HETE Spectral Analysis
  96. GRB 051227: XRT refined analysis
  97. GRB 051227: Further analysis of the Swift-BAT burst
  98. GRB 051227: Refined analysis of the Swift-BAT burst
  99. GRB051227: SDSS pre-burst observations
  100. GRB 051227, optical observation

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