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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"

26326 results found.

  1. GRB 051105a, observation from Naini Tal and OSN
  2. GRB 051105a: MDM Observations
  3. GRB 051105A: TNG optical observations
  4. GRB051105A: Swift/UVOT Observations
  5. GRB 051105A, radio observations
  6. GRB051103:_MASTER_optical_observations
  7. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  8. GRB 051105A, optical observations
  9. XRT observations of GRB 051105A
  10. GRB 051105b: ART optical limits
  11. GRB 051105B (INTEGRAL 2701): Optical observation
  12. GRB 051105: Swift detection of a short burst
  13. Recent GRB UBVRcIc field photometry
  14. GRB051028 SARA Observation
  15. GRB051028: optical observations
  16. GRB051028: Swift/UVOT upper limits
  17. GRB051028: Swift XRT Position
  18. GRB051028:MASTER observations
  19. GRB051021B: Swift/UVOT Upper limits
  20. GRB 051021, Optical Observations
  21. GRB 051022: XRT Refined Spectral and Temporal Analysis
  22. GRB051012: Swift-XRT analysis
  23. GRB051021B: Swift XRT refined analysis
  24. GRB 051022, mm counterpart
  25. GRB 051022: Swift/UVOT Upper Limits
  26. GRB051022: Radio Counterpart
  27. GRB051022: IR observations
  28. GRB051021A: Swift XRT refined analysis
  29. GRB051022: Optical Observations
  30. GRB051021b: Magellan IR Imaging
  31. GRB 051021, SMARTS optical/IR observations
  32. GRB051022: Swift XRT Position
  33. GRB 051021: P200 Ks Observations
  34. GRB 051022 (=H3950): SXC Flight Localization is Valid
  35. GRB051021: Swift/UVOT Upper Limits
  36. GRB 051021B: Refined analysis of the Swift-BAT burst
  37. GRB 051022: SSO40 Optical Observations
  38. GRB051022,optical observation
  39. GRB 051021,optical observation
  40. GRB 051021B: Swift detection of a burst
  41. GRB 051021 : optical afterglow observation at Lulin
  42. GRB 051021: Optical observations and candidate afterglow
  43. GRB051021.63
  44. GRB051021.6: MASTER optical observation
  45. GRB051021: A GRB Localized by HETE
  46. Swift-BAT triggered on a posible CR Shower or possible GRB
  47. GRB 051016b: Optical limit
  48. Afterglow candidate of GRB 051016B observed at Lulin
  49. GRB 051016A: Swift/UVOT upper limits
  50. GRB 051016B: refined analysis of the Swift/XRT data
  51. GRB 051016B: Swift/UVOT detection
  52. GRB 051016B,optical observation
  53. GRB 051016B : Optical follow-up at Lulin
  54. GRB 051016B: Refined analysis of the Swift-BAT burst
  55. GRB 051016B: Swift detection of a soft burst
  56. GRB 051016: Swift-BAT refined analysis
  57. GRB051016 XMM-Newton observation
  58. GRB051016: Swift XRT refined analysis.
  59. GRB 051016: PROMPT Observations
  60. GRB051016: Swift detection of a burst
  61. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  62. GRB 051012: Swift-BAT detection of burst yesterday
  63. Swift-BAT Trigger 159578 is a possible burst
  64. GRB 051006: Swift/UVOT Upper Limits
  65. GRB051008: optical candidate
  66. GRB 051008 - a low redshift low-luminosity burst?
  67. GRB051011: bright nebulae near error box
  68. GRB051011: MASTER optical observation
  69. GRB051008: Final refined analysis of the Swift-BAT burst
  70. GRB051008: Radio Observation
  71. GRB 051008, optical observations
  72. GRB 051008: early Swift XRT analysis
  73. GRB 051008: Swift UVOT Candidate
  74. GRB 051006: P60 Observations
  75. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  76. GRB 051006: optical observations at Sierra Nevada
  77. GRB051006: Refined analysis of the Swift-BAT burst
  78. GRB051006: Swift detection of a burst
  79. GRB 050906, summary of radio observations
  80. GRB051001: Swift UVOT Upper Limits
  81. GRB 050925: Second Epoch WSRT Radio Observations
  82. GRB 051001: I-band limit
  83. GRB 051001: AAT infra-red observations
  84. GRB 051001: Swift-BAT refined analysis
  85. GRB 051001: Swift Detection of a Burst
  86. GRB 050820A: NIR photometry at the TNG
  87. GRB050925: Swift/XRT limits
  88. GRB/SGR 050925: IR Observations
  89. GRB 050922C: break in the lightcurve
  90. GRB050925: Swift UVOT upper limits
  91. Refined analysis of the Swift-BAT soft short burst
  92. GRB050925: Faulkes Telescope North R-band limit
  93. GRB050925: Swift-BAT detection of a short burst
  94. GRB050922C: TNG spectroscopic observations
  95. GRB050922B: refined XRT analysis
  96. GRB050922B: Swift UVOT early upper limits.
  97. GRB050922C: Optical Observations
  98. GRB 050922C: Swift XRT refined analysis
  99. HETE Fregate observations of GRB 050922C
  100. GRB 050922C: Swift-BAT refined analysis

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