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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"

28088 results found.

  1. GRB 051211:IAC80 optical observations
  2. GRB 051210: SALT detection limit
  3. GRB 051210: Swift XRT refined analysis
  4. GRB 051210: FRAM early limit
  5. GRB 051210: Swift-BAT refined analysis of a short burst
  6. GRB051210: Swift UVOT Observation
  7. GRB 051210: Swift detection of a burst
  8. An extraordinary long burst on December 3 from SGR1806-20
  9. Possible resuming of the SGR 1806-20 activity
  10. GRB051117B: Swift XRT refined analysis
  11. GRB051117b: No Swift/UVOT Detection
  12. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  13. GRB 051117A: Swift/UVOT Detection of an Afterglow
  14. GRB051111: Suzaku WAM observation of the prompt emission
  15. GRB051008: Suzaku WAM observation of the prompt emission
  16. GRB 051117B: R and I observations of possible host galaxy
  17. GRB 051117A: Refined analysis of the Swift-BAT burst
  18. GRB 051117B: Refined analysis of the Swift-BAT burst
  19. GRB 051117B,optical observation
  20. GRB 051117B: Lulin R and I band observation
  21. GRB051114: results of the Swift-XRT observation
  22. GRB 051109B : Nainital upper limits
  23. GRB 051114: Radio Observations
  24. GRB 051114: Swift-BAT refined analysis
  25. GRB050925: analysis of the XMM-Newton observation
  26. GRB 051114: Swift-BAT detection of a short burst
  27. GRB 051111: Further spectroscopic analysis
  28. GRB 051111: Radio afterglow
  29. GRB 051113: Swift-BAT refined analysis
  30. GRB051103: Radio Observations
  31. GRB/SGR 050925: XMM-Newton ToO observation
  32. GRB051111: Swift/UVOT Observations
  33. GRB051111: XRT preliminary analysis
  34. GRB 051111: Swift-BAT refined analysis
  35. GRB 051109A Optical Observations
  36. GRB 051111A : Lulin BVRI multi band afterglow observation
  37. GRB051111a: SARA Observations
  38. GRB 051111a: IR photometry
  39. GRB 051109B. Radio Observations
  40. GRB 051109A
  41. GRB051109A - radio observations
  42. GRB 051109B: Swift-BAT refined analysis
  43. GRB 051109A: Swift-UVOT Observations
  44. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  45. GRB051109B: no UVOT source detected
  46. GRB051109B: XRT refined analysis
  47. GRB 051109B : Lulin Optical Observations
  48. GRB 051109A : Lulin BVRI Optical afterglow observation
  49. GRB051109A: further steepening in the X-ray light curve
  50. GRB051109A: XRT refined analysis
  51. GRB 051109B: Super-LOTIS Observations
  52. GRB051105B: REM Optical observation
  53. GRB 051109B: Swift detection of a burst
  54. GRB 051109: Rc and Ic observations
  55. GRB 051109: Swift-BAT refined analysis
  56. GRB 051109a: IR Photometry and Astrometry
  57. GRB051109: Swift detection of a burst
  58. GRB 051109a: IR Detections
  59. GRB051105B: Swift/XRT upper limit
  60. GRB051105B: Swift/UVOT upper limit
  61. GRB051103: MASTER: OT limit and host galaxy candidates
  62. GRB051028: Swift-XRT refined analysis
  63. GRB 051105a, observation from Naini Tal and OSN
  64. GRB 051105a: MDM Observations
  65. GRB 051105A: TNG optical observations
  66. GRB051105A: Swift/UVOT Observations
  67. GRB 051105A, radio observations
  68. GRB051103:_MASTER_optical_observations
  69. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  70. GRB 051105A, optical observations
  71. XRT observations of GRB 051105A
  72. GRB 051105b: ART optical limits
  73. GRB 051105B (INTEGRAL 2701): Optical observation
  74. GRB 051105: Swift detection of a short burst
  75. Recent GRB UBVRcIc field photometry
  76. GRB051028 SARA Observation
  77. GRB051028: optical observations
  78. GRB051028: Swift/UVOT upper limits
  79. GRB051028: Swift XRT Position
  80. GRB051028:MASTER observations
  81. GRB051021B: Swift/UVOT Upper limits
  82. GRB 051021, Optical Observations
  83. GRB 051022: XRT Refined Spectral and Temporal Analysis
  84. GRB051012: Swift-XRT analysis
  85. GRB051021B: Swift XRT refined analysis
  86. GRB 051022, mm counterpart
  87. GRB 051022: Swift/UVOT Upper Limits
  88. GRB051022: Radio Counterpart
  89. GRB051022: IR observations
  90. GRB051021A: Swift XRT refined analysis
  91. GRB051022: Optical Observations
  92. GRB051021b: Magellan IR Imaging
  93. GRB 051021, SMARTS optical/IR observations
  94. GRB051022: Swift XRT Position
  95. GRB 051021: P200 Ks Observations
  96. GRB 051022 (=H3950): SXC Flight Localization is Valid
  97. GRB051021: Swift/UVOT Upper Limits
  98. GRB 051021B: Refined analysis of the Swift-BAT burst
  99. GRB 051022: SSO40 Optical Observations
  100. GRB051022,optical observation

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