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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"

27394 results found.

  1. GRB051211b: P60 Observations
  2. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  3. GRB 051210: Swift/UVOT upper limits
  4. GRB 051210: Magellan Imaging
  5. GRB 051211: TAROT optical limits
  6. GRB 051211B: a possible optical detection by TAROT
  7. GRB 051211:IAC80 optical observations
  8. GRB 051210: SALT detection limit
  9. GRB 051210: Swift XRT refined analysis
  10. GRB 051210: FRAM early limit
  11. GRB 051210: Swift-BAT refined analysis of a short burst
  12. GRB051210: Swift UVOT Observation
  13. GRB 051210: Swift detection of a burst
  14. An extraordinary long burst on December 3 from SGR1806-20
  15. Possible resuming of the SGR 1806-20 activity
  16. GRB051117B: Swift XRT refined analysis
  17. GRB051117b: No Swift/UVOT Detection
  18. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  19. GRB 051117A: Swift/UVOT Detection of an Afterglow
  20. GRB051111: Suzaku WAM observation of the prompt emission
  21. GRB051008: Suzaku WAM observation of the prompt emission
  22. GRB 051117B: R and I observations of possible host galaxy
  23. GRB 051117A: Refined analysis of the Swift-BAT burst
  24. GRB 051117B: Refined analysis of the Swift-BAT burst
  25. GRB 051117B,optical observation
  26. GRB 051117B: Lulin R and I band observation
  27. GRB051114: results of the Swift-XRT observation
  28. GRB 051109B : Nainital upper limits
  29. GRB 051114: Radio Observations
  30. GRB 051114: Swift-BAT refined analysis
  31. GRB050925: analysis of the XMM-Newton observation
  32. GRB 051114: Swift-BAT detection of a short burst
  33. GRB 051111: Further spectroscopic analysis
  34. GRB 051111: Radio afterglow
  35. GRB 051113: Swift-BAT refined analysis
  36. GRB051103: Radio Observations
  37. GRB/SGR 050925: XMM-Newton ToO observation
  38. GRB051111: Swift/UVOT Observations
  39. GRB051111: XRT preliminary analysis
  40. GRB 051111: Swift-BAT refined analysis
  41. GRB 051109A Optical Observations
  42. GRB 051111A : Lulin BVRI multi band afterglow observation
  43. GRB051111a: SARA Observations
  44. GRB 051111a: IR photometry
  45. GRB 051109B. Radio Observations
  46. GRB 051109A
  47. GRB051109A - radio observations
  48. GRB 051109B: Swift-BAT refined analysis
  49. GRB 051109A: Swift-UVOT Observations
  50. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  51. GRB051109B: no UVOT source detected
  52. GRB051109B: XRT refined analysis
  53. GRB 051109B : Lulin Optical Observations
  54. GRB 051109A : Lulin BVRI Optical afterglow observation
  55. GRB051109A: further steepening in the X-ray light curve
  56. GRB051109A: XRT refined analysis
  57. GRB 051109B: Super-LOTIS Observations
  58. GRB051105B: REM Optical observation
  59. GRB 051109B: Swift detection of a burst
  60. GRB 051109: Rc and Ic observations
  61. GRB 051109: Swift-BAT refined analysis
  62. GRB 051109a: IR Photometry and Astrometry
  63. GRB051109: Swift detection of a burst
  64. GRB 051109a: IR Detections
  65. GRB051105B: Swift/XRT upper limit
  66. GRB051105B: Swift/UVOT upper limit
  67. GRB051103: MASTER: OT limit and host galaxy candidates
  68. GRB051028: Swift-XRT refined analysis
  69. GRB 051105a, observation from Naini Tal and OSN
  70. GRB 051105a: MDM Observations
  71. GRB 051105A: TNG optical observations
  72. GRB051105A: Swift/UVOT Observations
  73. GRB 051105A, radio observations
  74. GRB051103:_MASTER_optical_observations
  75. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  76. GRB 051105A, optical observations
  77. XRT observations of GRB 051105A
  78. GRB 051105b: ART optical limits
  79. GRB 051105B (INTEGRAL 2701): Optical observation
  80. GRB 051105: Swift detection of a short burst
  81. Recent GRB UBVRcIc field photometry
  82. GRB051028 SARA Observation
  83. GRB051028: optical observations
  84. GRB051028: Swift/UVOT upper limits
  85. GRB051028: Swift XRT Position
  86. GRB051028:MASTER observations
  87. GRB051021B: Swift/UVOT Upper limits
  88. GRB 051021, Optical Observations
  89. GRB 051022: XRT Refined Spectral and Temporal Analysis
  90. GRB051012: Swift-XRT analysis
  91. GRB051021B: Swift XRT refined analysis
  92. GRB 051022, mm counterpart
  93. GRB 051022: Swift/UVOT Upper Limits
  94. GRB051022: Radio Counterpart
  95. GRB051022: IR observations
  96. GRB051021A: Swift XRT refined analysis
  97. GRB051022: Optical Observations
  98. GRB051021b: Magellan IR Imaging
  99. GRB 051021, SMARTS optical/IR observations
  100. GRB051022: Swift XRT Position

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