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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"

32494 results found.

  1. GRB 060218/SN 2006aj: ABT observations
  2. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  3. GRB 060218 : Radio upper limits from GMRT
  4. GRB 060218/SN 2006aj: WIRO optical observations
  5. GRB 060218/SN 2006aj: RBO optical observations
  6. GRB 060204B: GETS early limit
  7. GRB 060218: Refined analysis of the radio afterglow
  8. GRB 060223B: ART optical limits
  9. GRB 060223B: Swift-BAT refined analysis
  10. GRB 060223a: Swift/UVOT refined analysis
  11. GRB 060223: Swift XRT Team preliminary analysis
  12. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  13. GRB 060223B: Swift detection of a bright burst
  14. GRB 060223: Swift-BAT refined analysis
  15. Correction to GCN 4816 on GRB060218
  16. GRB 060218/SN 2006aj: optical observations
  17. GRB060218: Optical brightening in V and R
  18. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  19. Spectral properties of GRB060218/SN2006aj
  20. GRB 060219: Swift-BAT refined analysis
  21. GRB 060218: rebrightening
  22. GRB 060218: emergence of the underlying SN spectrum
  23. GRB 060218: Decline in r-band flux
  24. GRB 060218: spectroscopic observations
  25. GRB 060218: Further refined analysis of the Swift-BAT burst
  26. GRB 060218: Likely an underluminous GRB
  27. GRB060218: Optical Spectroscopy of GRB-SN
  28. GRB060218: VLT spectroscopy
  29. GRB 060218: Optical Observations at Xinglong Obs.
  30. GRB 060219: SDSS galaxy inside XRT error circle
  31. GRB060218: UV Detection and Light Curves
  32. GRB060219: SARA Observations
  33. GRB 060219: Swift/UVOT Upper Limits
  34. GRB 060219: Swift-XRT Team refined analysis
  35. GRB 051221B: Swift-XRT Team Refined Analysis
  36. GRB 060219: Partial refined analysis of the Swift-BAT burst
  37. GRB060218: Radio Afterglow Discovery
  38. GRB 060219: Swift-XRT position typo correction
  39. GRB 060219: Swift-XRT position
  40. GRB 060218: optical/nIR observations at La Palma
  41. GRB060219: SDSS pre-burst observations
  42. Oddball GRB 060218, transient or GRB?
  43. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  44. Brightening of the Optical Counterpart of the Possible GRB 060218
  45. GRB 060218: MDM Observations
  46. GRB 060218: Pre-burst detection of a possible host galaxy
  47. GRB 060218A: ROTSE-III Possible Optical Flare
  48. GRB060218: Swift/XRT refined position of a possible burst
  49. Preliminary refined analysis of the Swift-BAT trigger 191157
  50. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  51. GRB 060211B: Swift/UVOT Upper Limits
  52. GRB060218 : SDSS pre-burst observations
  53. GRB 060218: Swift XRT Position
  54. GRB 060213: optical afterglow not confirmed
  55. Swift UVOT observations of GRB060213
  56. GRB 060211B: Skynet Observations
  57. GRB 060213: optical afterglow candidate
  58. GRB060213: Swift XRT observations and possible afterglow candidate
  59. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  60. GRB060213: MASTER final result
  61. GRB 060211b: WIRO NIR Observations
  62. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  63. Konus-Wind observation of bright hard GRB 060213
  64. GRB 060210: Radio Observations
  65. GRB 060211a: WIRO NIR Observations
  66. GRB060211B: REM optical and NIR observations
  67. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  68. GRB 060211A: Further refined analysis of the Swift burst
  69. GRB060121: optical observations
  70. GRB060110: optical observations
  71. GRB060105: optical observations
  72. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  73. GRB 060211b: P60 Observations
  74. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  75. GRB 060206: SOAR Detections
  76. GRB 050826: Optical Afterglow and Host Galaxy
  77. GRB 060210: Further refined analysis of the Swift-BAT burst
  78. GRB 060211B: Swift/BAT refined analysis
  79. GRB060210: Swift/UVOT Upper Limits
  80. GRB 060211B: Swift-XRT Team refined analysis
  81. GRB060211b: optical observation
  82. GRB060211B: Swift/XRT position
  83. GRB 060210: Optical Observations
  84. GRB 060211A: Swift XRT Team Refined Analysis
  85. GRB060211: Faulkes North observation
  86. GRB 060211: ROTSE-III Optical Limits
  87. GRB 060210: Refined analysis of the Swift-BAT burst
  88. GRB060210: Swift XRT Refined Analysis
  89. GRB060206, optical observations
  90. GRB060210: Optical Observations
  91. GRB060210: Gemini absorption spectroscopy
  92. GRB060210: Early Optical Observations
  93. GRB060210:Faulkes Telescope North Afterglow Confirmation
  94. GRB 060206: Swift/UVOT Observations
  95. GRB060209: RTT150 optical observations
  96. GRB 060209 : TAROT optical observation
  97. GRB 060206: near-infrared observations (JK' imaging)
  98. GRB 060206: WSRT Radio Observations
  99. GRB 060203: Swift/UVOT upper limits
  100. GRB 060206: TTT Observations

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