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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"

37057 results found.

  1. GRB 060115: Swift/UVOT upper limits
  2. GRB 060114: REM observations
  3. GRB 060115: Swift XRT refined analysis
  4. GRB 060115: OT finding chart
  5. GRB 060114: Swift/UVOT Observations
  6. GRB 060115: MITSuME optical afterglow candidate
  7. GRB 060115: Swift detection of a burst
  8. GRB 060114: Swift XRT upper limit
  9. GRB 060114: refined position
  10. GRB 060114: A long GRB detected by INTEGRAL
  11. GRB060114: Faulkes North observation
  12. GRB 060108: IR observations of afterglow
  13. GRB060108: Faulkes North afterglow evidence
  14. GRB 060108: further analysis of VLT images
  15. GRB 060108: Evidence for an XRT Position Offset
  16. GRB 060110: KAIT observations
  17. GRB 060111B: Swift XRT refined analysis
  18. GRB 060111A: refined UVOT anaysis
  19. GRB 060111B: MITSuME detection of optical afterglow
  20. GRB 060111B: TAROT optical observation
  21. GRB060111A: RTT150 optical observations
  22. GRB060111B: RTT150, possible host galaxy
  23. GRB 060111B: Refined analysis of the Swift-BAT burst
  24. GRB 060110: MARGE observations
  25. GRB 060111(a): P60 Observations
  26. GRB 060111B: Gualba observatory limit
  27. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  28. GRB 060111B: Swift detection of a burst
  29. GRB 060111: Swift-BAT Refined Analysis
  30. GRB060111.2:_MASTER optical limit
  31. GRB 060108: VLT K-band observations
  32. GRB 060111: TAROT optical observation
  33. GRB 060111: possible UVOT counterpart
  34. GRB060111 : XRT refined analysis
  35. GRB 060111: ROTSE-III Optical Limits
  36. GRB 060111: Swift detection of a burst
  37. GRB 060110: Mitsume optical observations
  38. GRB 060110: Swift-BAT refined analysis
  39. GRB 060109: Swift-BAT refined analysis
  40. GRB 060108: z-band imaging from Gemini-North
  41. GRB 060110a: RAPTOR detection of early optical emission.
  42. GRB 060110: UKIRT K-band observations
  43. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  44. GRB 060110: IR Candidate Afterglow
  45. GRB 060110: Super-LOTIS observations
  46. GRB 060110: Optical observation
  47. GRB 060110: Correction
  48. Correction to GRB 060109 XRT analysis
  49. GRB 050110: IR Observations
  50. GRB 060110: Optical limit
  51. GRB 060110: Swift-BAT detection of a burst
  52. GRB 060109: Refined Swift-XRT analysis
  53. GRB 060109: Swift/UVOT upper limits
  54. GRB060109, optical observation
  55. GRB 060108: ISAS early observations and near IR upper limit
  56. GRB060108: P200 Ks Observations
  57. GRB 060108: early UKIRT K-band observations
  58. Swift UVOT correction to GCN 4455
  59. GRB 060109: Swift Detection of a long burst
  60. GRB 060108: a dark burst?
  61. GRB 060108: Refined XRT analysis
  62. GRB 060108: VLT J-band observations
  63. GRB 060108: Mitsume optical observations
  64. GRB 060108: Swift/UVOT upper limits
  65. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  66. GRB060108: SDSS pre-burst observations
  67. GRB060108: Faulkes Telescope observation
  68. GRB 060108: Refined analysis of the Swift-BAT burst
  69. GRB 060108: Swift XRT position
  70. GRB060108: Swift detection of its 100th GRB
  71. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  72. GRB 060105: Radio observations
  73. GRB 060105: MDM Observation
  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 060105: BAT refined analysis
  79. GRB 060102 - no XRT afterglow
  80. GRB 060105: XRT refined analysis
  81. GRB060105: Suzaku-XIS and -HXD observation plan
  82. GRB060105, optical observation
  83. GRB060105 : Kiso optical observation
  84. GRB060105: Swift detection of a bright long burst
  85. Swift-BAT trigger 175653 is not an astrophysical source
  86. GRB 060102: MDM Observation
  87. Swift-BAT trigger 175653 is probably not a GRB
  88. GRB 060102: Swift-BAT refined analysis
  89. Time Correction to GRB 060102
  90. GRB 060102: Swift-BAT detection of a burst
  91. GRB051211B: optical observations
  92. GRB051227: SARA Observations
  93. GRB 051221B: Optical Observations with Kuiper 1.54m
  94. GRB 051227: Likely host galaxy underlying afterglow position
  95. GRB 051227: optical observation
  96. GRB051221B: Radio observations
  97. GRB 051221A: VLA Radio Observations
  98. GRB051227: Radio Observations
  99. GRB 051227: Confirmed fading from Gemini observations
  100. GRB051227: further analysis of VLT images

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