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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36180 results found.

  1. GRB 060223b: Swift/UVOT Upper Limits
  2. GRB 060218/SN 2006aj: K-380 optical observations
  3. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  4. GRB 060223B: Swift XRT possible afterglow
  5. GRB 060218/SN 2006aj: ABT observations
  6. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  7. GRB 060218 : Radio upper limits from GMRT
  8. GRB 060218/SN 2006aj: WIRO optical observations
  9. GRB 060218/SN 2006aj: RBO optical observations
  10. GRB 060204B: GETS early limit
  11. GRB 060218: Refined analysis of the radio afterglow
  12. GRB 060223A:Xinglong optical limits
  13. GRB 060223B: ART optical limits
  14. GRB 060223B: Swift-BAT refined analysis
  15. GRB 060223a: Swift/UVOT refined analysis
  16. GRB 060223: Swift XRT Team preliminary analysis
  17. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  18. GRB 060223B: Swift detection of a bright burst
  19. GRB 060223: Swift-BAT refined analysis
  20. GRB 060218: rebrightening
  21. GRB 060218/SN 2006aj: optical observations
  22. GRB 060223: Keck redshift
  23. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  24. GRB 060223: Swift detection of a burst
  25. Spectral properties of GRB060218/SN2006aj
  26. GRB 060219: Swift-BAT refined analysis
  27. GRB 060218: rebrightening
  28. GRB 060218: emergence of the underlying SN spectrum
  29. GRB 060218: Decline in r-band flux
  30. GRB 060218: spectroscopic observations
  31. GRB 060218: Further refined analysis of the Swift-BAT burst
  32. GRB 060218: Likely an underluminous GRB
  33. GRB060218: Optical Spectroscopy of GRB-SN
  34. GRB060218: VLT spectroscopy
  35. GRB 060218: Optical Observations at Xinglong Obs.
  36. GRB 060219: SDSS galaxy inside XRT error circle
  37. GRB060218: UV Detection and Light Curves
  38. GRB060219: SARA Observations
  39. GRB 060219: Swift/UVOT Upper Limits
  40. GRB 060219: Swift-XRT Team refined analysis
  41. GRB 051221B: Swift-XRT Team Refined Analysis
  42. GRB 060219: Partial refined analysis of the Swift-BAT burst
  43. GRB060218: Radio Afterglow Discovery
  44. GRB 060219: Swift-XRT position typo correction
  45. GRB 060218: MDM Redshift
  46. GRB 060219: Swift-XRT position
  47. GRB 060218: optical/nIR observations at La Palma
  48. GRB060219: SDSS pre-burst observations
  49. GRB 060219: Swift-BAT detection of a weak burst
  50. Oddball GRB 060218, transient or GRB?
  51. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  52. Brightening of the Optical Counterpart of the Possible GRB 060218
  53. GRB 060218: MDM Observations
  54. GRB 060218: Pre-burst detection of a possible host galaxy
  55. GRB 060218A: ROTSE-III Possible Optical Flare
  56. Preliminary refined analysis of the Swift-BAT trigger 191157
  57. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  58. GRB 060211B: Swift/UVOT Upper Limits
  59. GRB060218 : SDSS pre-burst observations
  60. GRB 060218: Swift XRT Position
  61. GRB 060218: Swift-BAT detection of a possible burst
  62. GRB 060213: optical afterglow not confirmed
  63. Swift UVOT observations of GRB060213
  64. GRB 060211B: Skynet Observations
  65. GRB 060213: optical afterglow candidate
  66. GRB060213: Swift XRT observations and possible afterglow candidate
  67. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  68. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  69. GRB060213: MASTER final result
  70. GRB 060211b: WIRO NIR Observations
  71. GRB060213:_MASTER_optical_observation
  72. Konus-Wind observation of bright hard GRB 060213
  73. GRB 060213: IPN localization
  74. GRB 060210: Radio Observations
  75. GRB 060211a: WIRO NIR Observations
  76. GRB060211B: REM optical and NIR observations
  77. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  78. GRB 060211A: Further refined analysis of the Swift burst
  79. GRB060121: optical observations
  80. GRB060110: optical observations
  81. GRB060105: optical observations
  82. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  83. GRB 060211b: P60 Observations
  84. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  85. GRB 060206: SOAR Detections
  86. GRB 050826: Optical Afterglow and Host Galaxy
  87. GRB 060210: Further refined analysis of the Swift-BAT burst
  88. GRB 060211B: Swift/BAT refined analysis
  89. GRB060210: Swift/UVOT Upper Limits
  90. GRB 060211B: Swift-XRT Team refined analysis
  91. GRB060211b: optical observation
  92. GRB 060210: Optical Observations
  93. GRB060211.7: MASTER_optical_observation under the snow
  94. GRB 060211A: Swift XRT Team Refined Analysis
  95. GRB 060211B: Swift-BAT detection of a burst
  96. GRB060211: Faulkes North observation
  97. GRB 060211: ROTSE-III Optical Limits
  98. GRB 060211: Swift detection of a long burst
  99. GRB 060210: Refined analysis of the Swift-BAT burst
  100. GRB060210: Swift XRT Refined Analysis

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