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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"

27393 results found.

  1. GRB 051211A and GRB051211B: BOOTES simultaneous 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 051211:IAC80 optical observations
  7. GRB 051210: SALT detection limit
  8. GRB 051210: Swift XRT refined analysis
  9. GRB 051210: FRAM early limit
  10. GRB 051210: Swift-BAT refined analysis of a short burst
  11. GRB051210: Swift UVOT Observation
  12. GRB 051210: Swift detection of a burst
  13. An extraordinary long burst on December 3 from SGR1806-20
  14. Possible resuming of the SGR 1806-20 activity
  15. GRB051117B: Swift XRT refined analysis
  16. GRB051117b: No Swift/UVOT Detection
  17. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  18. GRB 051117A: Swift/UVOT Detection of an Afterglow
  19. GRB051111: Suzaku WAM observation of the prompt emission
  20. GRB051008: Suzaku WAM observation of the prompt emission
  21. GRB 051117B: R and I observations of possible host galaxy
  22. GRB 051117A: Refined analysis of the Swift-BAT burst
  23. GRB 051117B: Refined analysis of the Swift-BAT burst
  24. GRB 051117B,optical observation
  25. GRB 051117B: Lulin R and I band observation
  26. GRB051114: results of the Swift-XRT observation
  27. GRB 051109B : Nainital upper limits
  28. GRB 051114: Radio Observations
  29. GRB 051114: Swift-BAT refined analysis
  30. GRB050925: analysis of the XMM-Newton observation
  31. GRB 051114: Swift-BAT detection of a short burst
  32. GRB 051111: Further spectroscopic analysis
  33. GRB 051111: Radio afterglow
  34. GRB 051113: Swift-BAT refined analysis
  35. GRB051103: Radio Observations
  36. GRB/SGR 050925: XMM-Newton ToO observation
  37. GRB051111: Swift/UVOT Observations
  38. GRB051111: XRT preliminary analysis
  39. GRB 051111: Swift-BAT refined analysis
  40. GRB 051109A Optical Observations
  41. GRB 051111A : Lulin BVRI multi band afterglow observation
  42. GRB051111a: SARA Observations
  43. GRB 051111a: IR photometry
  44. GRB 051109B. Radio Observations
  45. GRB 051109A
  46. GRB051109A - radio observations
  47. GRB 051109B: Swift-BAT refined analysis
  48. GRB 051109A: Swift-UVOT Observations
  49. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  50. GRB051109B: no UVOT source detected
  51. GRB051109B: XRT refined analysis
  52. GRB 051109B : Lulin Optical Observations
  53. GRB 051109A : Lulin BVRI Optical afterglow observation
  54. GRB051109A: further steepening in the X-ray light curve
  55. GRB051109A: XRT refined analysis
  56. GRB 051109B: Super-LOTIS Observations
  57. GRB051105B: REM Optical observation
  58. GRB 051109B: Swift detection of a burst
  59. GRB 051109: Rc and Ic observations
  60. GRB 051109: Swift-BAT refined analysis
  61. GRB 051109a: IR Photometry and Astrometry
  62. GRB051109: Swift detection of a burst
  63. GRB 051109a: IR Detections
  64. GRB051105B: Swift/XRT upper limit
  65. GRB051105B: Swift/UVOT upper limit
  66. GRB051103: MASTER: OT limit and host galaxy candidates
  67. GRB051028: Swift-XRT refined analysis
  68. GRB 051105a, observation from Naini Tal and OSN
  69. GRB 051105a: MDM Observations
  70. GRB 051105A: TNG optical observations
  71. GRB051105A: Swift/UVOT Observations
  72. GRB 051105A, radio observations
  73. GRB051103:_MASTER_optical_observations
  74. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  75. GRB 051105A, optical observations
  76. XRT observations of GRB 051105A
  77. GRB 051105b: ART optical limits
  78. GRB 051105B (INTEGRAL 2701): Optical observation
  79. GRB 051105: Swift detection of a short burst
  80. Recent GRB UBVRcIc field photometry
  81. GRB051028 SARA Observation
  82. GRB051028: optical observations
  83. GRB051028: Swift/UVOT upper limits
  84. GRB051028: Swift XRT Position
  85. GRB051028:MASTER observations
  86. GRB051021B: Swift/UVOT Upper limits
  87. GRB 051021, Optical Observations
  88. GRB 051022: XRT Refined Spectral and Temporal Analysis
  89. GRB051012: Swift-XRT analysis
  90. GRB051021B: Swift XRT refined analysis
  91. GRB 051022, mm counterpart
  92. GRB 051022: Swift/UVOT Upper Limits
  93. GRB051022: Radio Counterpart
  94. GRB051022: IR observations
  95. GRB051021A: Swift XRT refined analysis
  96. GRB051022: Optical Observations
  97. GRB051021b: Magellan IR Imaging
  98. GRB 051021, SMARTS optical/IR observations
  99. GRB051022: Swift XRT Position
  100. GRB 051021: P200 Ks Observations

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