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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"

28090 results found.

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

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