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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"

28092 results found.

  1. GRB 051210: Swift/UVOT upper limits
  2. GRB 051210: Magellan Imaging
  3. GRB 051211: TAROT optical limits
  4. GRB 051211B: a possible optical detection by TAROT
  5. GRB 051211:IAC80 optical observations
  6. GRB 051210: SALT detection limit
  7. GRB 051210: Swift XRT refined analysis
  8. GRB 051210: FRAM early limit
  9. GRB 051210: Swift-BAT refined analysis of a short burst
  10. GRB051210: Swift UVOT Observation
  11. GRB 051210: Swift detection of a burst
  12. An extraordinary long burst on December 3 from SGR1806-20
  13. Possible resuming of the SGR 1806-20 activity
  14. GRB051117B: Swift XRT refined analysis
  15. GRB051117b: No Swift/UVOT Detection
  16. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  17. GRB 051117A: Swift/UVOT Detection of an Afterglow
  18. GRB051111: Suzaku WAM observation of the prompt emission
  19. GRB051008: Suzaku WAM observation of the prompt emission
  20. GRB 051117B: R and I observations of possible host galaxy
  21. GRB 051117A: Refined analysis of the Swift-BAT burst
  22. GRB 051117B: Refined analysis of the Swift-BAT burst
  23. GRB 051117B,optical observation
  24. GRB 051117B: Lulin R and I band observation
  25. GRB051114: results of the Swift-XRT observation
  26. GRB 051109B : Nainital upper limits
  27. GRB 051114: Radio Observations
  28. GRB 051114: Swift-BAT refined analysis
  29. GRB050925: analysis of the XMM-Newton observation
  30. GRB 051114: Swift-BAT detection of a short burst
  31. GRB 051111: Further spectroscopic analysis
  32. GRB 051111: Radio afterglow
  33. GRB 051113: Swift-BAT refined analysis
  34. GRB051103: Radio Observations
  35. GRB/SGR 050925: XMM-Newton ToO observation
  36. GRB051111: Swift/UVOT Observations
  37. GRB051111: XRT preliminary analysis
  38. GRB 051111: Swift-BAT refined analysis
  39. GRB 051109A Optical Observations
  40. GRB 051111A : Lulin BVRI multi band afterglow observation
  41. GRB051111a: SARA Observations
  42. GRB 051111a: IR photometry
  43. GRB 051109B. Radio Observations
  44. GRB 051109A
  45. GRB051109A - radio observations
  46. GRB 051109B: Swift-BAT refined analysis
  47. GRB 051109A: Swift-UVOT Observations
  48. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  49. GRB051109B: no UVOT source detected
  50. GRB051109B: XRT refined analysis
  51. GRB 051109B : Lulin Optical Observations
  52. GRB 051109A : Lulin BVRI Optical afterglow observation
  53. GRB051109A: further steepening in the X-ray light curve
  54. GRB051109A: XRT refined analysis
  55. GRB 051109B: Super-LOTIS Observations
  56. GRB051105B: REM Optical observation
  57. GRB 051109B: Swift detection of a burst
  58. GRB 051109: Rc and Ic observations
  59. GRB 051109: Swift-BAT refined analysis
  60. GRB 051109a: IR Photometry and Astrometry
  61. GRB051109: Swift detection of a burst
  62. GRB 051109a: IR Detections
  63. GRB051105B: Swift/XRT upper limit
  64. GRB051105B: Swift/UVOT upper limit
  65. GRB051103: MASTER: OT limit and host galaxy candidates
  66. GRB051028: Swift-XRT refined analysis
  67. GRB 051105a, observation from Naini Tal and OSN
  68. GRB 051105a: MDM Observations
  69. GRB 051105A: TNG optical observations
  70. GRB051105A: Swift/UVOT Observations
  71. GRB 051105A, radio observations
  72. GRB051103:_MASTER_optical_observations
  73. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  74. GRB 051105A, optical observations
  75. XRT observations of GRB 051105A
  76. GRB 051105b: ART optical limits
  77. GRB 051105B (INTEGRAL 2701): Optical observation
  78. GRB 051105: Swift detection of a short burst
  79. Recent GRB UBVRcIc field photometry
  80. GRB051028 SARA Observation
  81. GRB051028: optical observations
  82. GRB051028: Swift/UVOT upper limits
  83. GRB051028: Swift XRT Position
  84. GRB051028:MASTER observations
  85. GRB051021B: Swift/UVOT Upper limits
  86. GRB 051021, Optical Observations
  87. GRB 051022: XRT Refined Spectral and Temporal Analysis
  88. GRB051012: Swift-XRT analysis
  89. GRB051021B: Swift XRT refined analysis
  90. GRB 051022, mm counterpart
  91. GRB 051022: Swift/UVOT Upper Limits
  92. GRB051022: Radio Counterpart
  93. GRB051022: IR observations
  94. GRB051021A: Swift XRT refined analysis
  95. GRB051022: Optical Observations
  96. GRB051021b: Magellan IR Imaging
  97. GRB 051021, SMARTS optical/IR observations
  98. GRB051022: Swift XRT Position
  99. GRB 051021: P200 Ks Observations
  100. GRB 051022 (=H3950): SXC Flight Localization is Valid

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