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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"

27402 results found.

  1. GRB 050219b: Swift-BAT detection of a burst
  2. GRB 050219b: CORRECTION: Swift XRT Position
  3. GRB 050219b: Swift XRT Position
  4. GRB 050219: Swift-BAT detection of a burst
  5. GRB 050215b: XRT confirmation of IR afterglow candidate
  6. GRB050215b: P60 Optical Observations
  7. GRB 050215b: Swift XRT Source Variability
  8. GRB 050215B: candidate afterglow
  9. GRB 050215b : Lulin follow-up observation
  10. GRB 050215b, BOOTES-2 simultaneous optical observations
  11. GRB050215A: ROTSE-III Optical Observations
  12. GRB050209: TAROT optical observations
  13. GRB 050209(=U11568): Duration and spectrum
  14. GRB050209: REM optical observations
  15. GRB 050209 I-band observation
  16. GRB 050209 Optical observations
  17. GRB050209: P60 Optical Observations
  18. GRB 050128: Radio observations
  19. Further analysis of the short Swift-BAT GRB 050202
  20. GRB 050202: Short burst detected by Swift-BAT
  21. GRB 050128 Optical observation with REM
  22. SGR1806-20: Swift-BAT detection of a large normal burst
  23. GRB 050128: near-infrared observations with REM
  24. GRB050128,optical observations
  25. GRB050128 Swift-BAT observations
  26. GRB 050128: Swift XRT prompt afterglow position
  27. GRB050126: MASTER optical limit for KECK OT
  28. GRB050126: Burst Parameters Measured by BAT
  29. GRB050126: MASTER optical observations
  30. GRB 050124 I-band observation
  31. GRB050124,optical observation
  32. GRB 050124 : Lulin R-band follow-up observation
  33. GRB050124: Updated Swift XRT Position and Fluxes
  34. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  35. GRB050124: Refined BAT position, spectral and fluence information
  36. GRB 050123 : I-band follow-up observation
  37. GRB050123,optical observation
  38. GRB 050123: KAIT observations
  39. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  40. GRB050117: Refined XRT position
  41. GRB050117: MASTER optical observations
  42. MASTER:GRB050117 SWIFT
  43. GRB050117: Swift XRT Position
  44. Triangulation of Short Hard GRB050112 (large error box)
  45. SGR 1806-20: Further VLA Observations
  46. SGR1806-20: Swift-BAT observations of two additional bursts
  47. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  48. Further VLA observations of SGR 1806-20
  49. SGR 1806-20 and extragalactic short-duration GRBs
  50. Further ATCA observations of SGR 1806-20
  51. Fourth Epoch VLA observations of SGR 1806-20
  52. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  53. ATCA observations of SGR 1806-20
  54. SGR 1806-20, RHESSI observations of the 041227 giant flare
  55. Third epoch observations of SGR 1806-20 with VLA
  56. Second Epoch VLA observations of SGR 1806-20
  57. Second-epoch VLA observations of SGR 1806-20
  58. SGR1806 VLA Observations
  59. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  60. GRB 041217: Optical observations
  61. GRB041228: Swift-BAT detection of a burst
  62. GRB041219; RXTE ASM Observations
  63. NIR Observations of GRB 041219
  64. GRB041226: Swift-BAT detection of a burst
  65. GRB041223: decay of the afterglow
  66. GRB 041224: near-infrared observations with REM
  67. GRB 041223 Fluence measured by Swift-BAT
  68. GRB041223: optical and NIR observations with REM
  69. Swift-BAT Time History of GRB041219
  70. GRB 041219: TAROT optical observations
  71. GRB 041218: TAROT optical observations
  72. GRB 041223: J-band observations of the afterglow
  73. GRB 041219c: PROMPT Observations
  74. GRB041223: Swift-BAT detection of a bright long burst
  75. GRB 041218: optical observations
  76. GRB 041219 : optical follow-up observations
  77. Deep RAPTOR observations during GRB 041219
  78. GRB 041218 Optical Observations
  79. GRB041219: Continued NIR Observations
  80. GRB 041219 ,optical observation
  81. GRB 041219: Radio Afterglow Detection
  82. GRB 041218 : Radio Observations
  83. GRB 041218: R-band optical observations
  84. GRB041218: optical observations
  85. GRB041219: Confirmed NIR Afterglow
  86. Swift-BAT detection of the bright long burst GRB041219
  87. GRB 041219: Infrared Afterglow Candidate
  88. GRB041219, BVRcIc field calibration
  89. GRB 041219: Infrared Afterglow Candidate
  90. GRB041218, BVRcIc field calibration
  91. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  92. GRB 041219 - A long GRB detected by INTEGRAL
  93. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  94. GRB 041217: PROMPT Observations
  95. GRB 041217: LCO40 Optical Observations and Possible Candidates
  96. GRB 041218 - A long GRB detected by integral
  97. GRB041217: NIR and optical observations with REM
  98. GRB041217: Infrared Observations
  99. GRB041217: The First GRB Located On-Board Swift
  100. GRB041211: Faulkes Telescope continued optical monitoring

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