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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"

28097 results found.

  1. GRB 051211B: Swift/UVOT upper limits
  2. GRB 051211A,optical observation
  3. GRB051211B: Liverpool Telescope observation
  4. GRB051211b: P60 Observations
  5. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  6. GRB 051210: Swift/UVOT upper limits
  7. GRB 051210: Magellan Imaging
  8. GRB 051211: TAROT optical limits
  9. GRB 051211B: a possible optical detection by TAROT
  10. GRB 051211:IAC80 optical observations
  11. GRB 051210: SALT detection limit
  12. GRB 051210: Swift XRT refined analysis
  13. GRB 051210: FRAM early limit
  14. GRB 051210: Swift-BAT refined analysis of a short burst
  15. GRB051210: Swift UVOT Observation
  16. GRB 051210: Swift detection of a burst
  17. An extraordinary long burst on December 3 from SGR1806-20
  18. Possible resuming of the SGR 1806-20 activity
  19. GRB051117B: Swift XRT refined analysis
  20. GRB051117b: No Swift/UVOT Detection
  21. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  22. GRB 051117A: Swift/UVOT Detection of an Afterglow
  23. GRB051111: Suzaku WAM observation of the prompt emission
  24. GRB051008: Suzaku WAM observation of the prompt emission
  25. GRB 051117B: R and I observations of possible host galaxy
  26. GRB 051117A: Refined analysis of the Swift-BAT burst
  27. GRB 051117B: Refined analysis of the Swift-BAT burst
  28. GRB 051117B,optical observation
  29. GRB 051117B: Lulin R and I band observation
  30. GRB051114: results of the Swift-XRT observation
  31. GRB 051109B : Nainital upper limits
  32. GRB 051114: Radio Observations
  33. GRB 051114: Swift-BAT refined analysis
  34. GRB050925: analysis of the XMM-Newton observation
  35. GRB 051114: Swift-BAT detection of a short burst
  36. GRB 051111: Further spectroscopic analysis
  37. GRB 051111: Radio afterglow
  38. GRB 051113: Swift-BAT refined analysis
  39. GRB051103: Radio Observations
  40. GRB/SGR 050925: XMM-Newton ToO observation
  41. GRB051111: Swift/UVOT Observations
  42. GRB051111: XRT preliminary analysis
  43. GRB 051111: Swift-BAT refined analysis
  44. GRB 051109A Optical Observations
  45. GRB 051111A : Lulin BVRI multi band afterglow observation
  46. GRB051111a: SARA Observations
  47. GRB 051111a: IR photometry
  48. GRB 051109B. Radio Observations
  49. GRB 051109A
  50. GRB051109A - radio observations
  51. GRB 051109B: Swift-BAT refined analysis
  52. GRB 051109A: Swift-UVOT Observations
  53. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  54. GRB051109B: no UVOT source detected
  55. GRB051109B: XRT refined analysis
  56. GRB 051109B : Lulin Optical Observations
  57. GRB 051109A : Lulin BVRI Optical afterglow observation
  58. GRB051109A: further steepening in the X-ray light curve
  59. GRB051109A: XRT refined analysis
  60. GRB 051109B: Super-LOTIS Observations
  61. GRB051105B: REM Optical observation
  62. GRB 051109B: Swift detection of a burst
  63. GRB 051109: Rc and Ic observations
  64. GRB 051109: Swift-BAT refined analysis
  65. GRB 051109a: IR Photometry and Astrometry
  66. GRB051109: Swift detection of a burst
  67. GRB 051109a: IR Detections
  68. GRB051105B: Swift/XRT upper limit
  69. GRB051105B: Swift/UVOT upper limit
  70. GRB051103: MASTER: OT limit and host galaxy candidates
  71. GRB051028: Swift-XRT refined analysis
  72. GRB 051105a, observation from Naini Tal and OSN
  73. GRB 051105a: MDM Observations
  74. GRB 051105A: TNG optical observations
  75. GRB051105A: Swift/UVOT Observations
  76. GRB 051105A, radio observations
  77. GRB051103:_MASTER_optical_observations
  78. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  79. GRB 051105A, optical observations
  80. XRT observations of GRB 051105A
  81. GRB 051105b: ART optical limits
  82. GRB 051105B (INTEGRAL 2701): Optical observation
  83. GRB 051105: Swift detection of a short burst
  84. Recent GRB UBVRcIc field photometry
  85. GRB051028 SARA Observation
  86. GRB051028: optical observations
  87. GRB051028: Swift/UVOT upper limits
  88. GRB051028: Swift XRT Position
  89. GRB051028:MASTER observations
  90. GRB051021B: Swift/UVOT Upper limits
  91. GRB 051021, Optical Observations
  92. GRB 051022: XRT Refined Spectral and Temporal Analysis
  93. GRB051012: Swift-XRT analysis
  94. GRB051021B: Swift XRT refined analysis
  95. GRB 051022, mm counterpart
  96. GRB 051022: Swift/UVOT Upper Limits
  97. GRB051022: Radio Counterpart
  98. GRB051022: IR observations
  99. GRB051021A: Swift XRT refined analysis
  100. GRB051022: Optical Observations

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