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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"

37509 results found.

  1. GRB 051211B: Swift XRT Observations
  2. GRB 051210: Swift/UVOT upper limits
  3. GRB 051210: Magellan Imaging
  4. GRB 051211: TAROT optical limits
  5. GRB 051211B: a possible optical detection by TAROT
  6. GRB 051211B: a long GRB detected by INTEGRAL
  7. GRB 051211: Swift XRT upper limit
  8. GRB 051211:IAC80 optical observations
  9. HETE SXC localization of GRB 051211 (=H3979)
  10. GRB 051210: Optical imaging from Las Campanas
  11. GRB 051210: SALT detection limit
  12. GRB 051210: BAT further refined analysis of the short burst
  13. GRB 051210: Swift XRT refined analysis
  14. GRB 051210: FRAM early limit
  15. GRB 051210: Swift-BAT refined analysis of a short burst
  16. GRB 051210: A short GRB in a cluster?
  17. GRB 051210: Swift detection of a burst
  18. IPN observations of SGR1806-20
  19. An extraordinary long burst on December 3 from SGR1806-20
  20. IBAS Alert 2706 : not a real GRB
  21. GRB051117B: optical observation
  22. GRB051111: optical observaion
  23. Swift-BAT trigger 165579 is not a GRB
  24. GRB 051127: Swift-BAT detection of a possible burst
  25. GRB051117b: No Swift/UVOT Detection
  26. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  27. GRB 051117A: Swift/UVOT Detection of an Afterglow
  28. GRB051111: Suzaku WAM observation of the prompt emission
  29. GRB051008: Suzaku WAM observation of the prompt emission
  30. GRB 051109B: GAO 150cm telescope Optical limit
  31. GRB 051109A : GAO 150cm telescope Rc-band detection
  32. GRB 051021 Optical Observations
  33. GRB 051117B: MARGE Optical Limits
  34. GRB 051117A and B: Radio Observations
  35. GRB 051117B: R and I observations of possible host galaxy
  36. GRB 051117b: NIR observations
  37. GRB 051117A: Refined analysis of the Swift-BAT burst
  38. GRB 051117B: Refined analysis of the Swift-BAT burst
  39. GRB 051117B,optical observation
  40. GRB 051117B: Lulin R and I band observation
  41. GRB 051117B: Optical observations
  42. GRB 051117B: ROTSE-III Optical Limits
  43. GRB 051117B: Swift detection of a burst
  44. GRB 051117: Swift detection of a bright burst
  45. GRB 051028 Optical Observations
  46. GRB 051109B : Nainital upper limits
  47. GRB 051114: Radio Observations
  48. GRB 051114: Swift-BAT refined analysis
  49. GRB051109A optical observations
  50. GRB 051114: Swift-BAT detection of a short burst
  51. GRB 051111: Further spectroscopic analysis
  52. GRB 051111: Radio afterglow
  53. GRB 051113: Swift-BAT refined analysis
  54. GRB 051113: Swift-BAT detection of a burst
  55. GRB 051111: AEOS optical observations
  56. GRB051103: Radio Observations
  57. GRB 051109A Milagro GeV/TeV Observations
  58. GRB/SGR 050925: XMM-Newton ToO observation
  59. GRB051111: Swift/UVOT Observations
  60. GRB 051111A : R-band temporal decay index based on Lulin
  61. GRB 051111: Swift-BAT refined analysis
  62. GRB 051109A Optical Observations
  63. GRB 051111A : Lulin BVRI multi band afterglow observation
  64. GRB051111a: SARA Observations
  65. GRB 051111a: IR photometry
  66. GRB 051111: Keck HIRES redshift
  67. GRB 051111A: KAIT optical observations
  68. GRB 051111a: Afterglow fading in Ic
  69. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  70. GRB 051103 Milagro GeV/TeV Observations
  71. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  72. GRB 051008 Tautenburg Supernova Search
  73. GRB 051109B. Radio Observations
  74. GRB 051109A
  75. GRB051109A - radio observations
  76. GRB 051105a: GETS optical limit
  77. GRB 051109b: GETS observation
  78. GRB 051109A: KAIT optical observations
  79. Early RAPTOR measurements of GRB 051109a - the movie.
  80. Konus-Wind observation of GRB 051109A
  81. GRB 051109B: Swift-BAT refined analysis
  82. GRB 051109B: ROTSE-III Optical Limits
  83. GRB 051109A: Swift-UVOT Observations
  84. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  85. GRB 051109B : Lulin Optical Observations
  86. GRB 051109A : Lulin BVRI Optical afterglow observation
  87. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  88. GRB051109B: XRT position
  89. GRB 051109B: Super-LOTIS Observations
  90. GRB 051109B Kiso optical follow-up observation
  91. GRB 051109B: Swift detection of a burst
  92. GRB 051109: HET Optical Spectrum and Absorption Redshift
  93. GRB 051109: PROMPT Detections
  94. GRB 051109: Rc and Ic observations
  95. GRB 051109: Swift-BAT refined analysis
  96. GRB 051109a: IR Photometry and Astrometry
  97. GRB 051109a: MDM Observations
  98. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  99. GRB 051109a: IR Detections
  100. GRB 051109: ROTSE-III Detection of Possible Counterpart

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