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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"

32719 results found.

  1. GRB 060313: Possible optical counterpart
  2. GRB 060313: Swift XRT position
  3. GRB 060313, SMARTS optical/IR observations
  4. GRB060313: optical and near infrared observations with REM
  5. GRB060218: SARA Observations of SN2006aj
  6. GRB 060312: Refined analysis of the Swift-BAT burst
  7. GRB 060312: Swift XRT team refined analysis
  8. GRB060306: APO Ks-band Imaging Observations
  9. GRB 060312: ROTSE-III Optical Limits
  10. GRB 060306: SOAR Ks Observations
  11. GRB 060306: MAGNUM observations
  12. Swift/UVOT observations of GRB060306
  13. GRB 060306: Swift-BAT refined analysis
  14. GRB 060306: Swift-XRT team refined analysis
  15. GRB 060306: PROMPT Observations
  16. GRB 060218: RTT150 optical observations
  17. GRB060218: Ep,i - Eiso correlation
  18. GRB060223b: optical limit
  19. GRB060218/SN 2006aj: optical observation in V
  20. GRB060218/SN 2006aj: optical observation
  21. GRB 060121: HST observations
  22. GRB 060218 : GMRT observation [Correction and Improvement]
  23. GRB 060223b: Swift/UVOT Upper Limits
  24. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  25. GRB 060223B: Swift XRT possible afterglow
  26. GRB 060218/SN 2006aj: ABT observations
  27. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  28. GRB 060218 : Radio upper limits from GMRT
  29. GRB 060218/SN 2006aj: WIRO optical observations
  30. GRB 060218/SN 2006aj: RBO optical observations
  31. GRB 060204B: GETS early limit
  32. GRB 060218: Refined analysis of the radio afterglow
  33. GRB 060223B: ART optical limits
  34. GRB 060223B: Swift-BAT refined analysis
  35. GRB 060223a: Swift/UVOT refined analysis
  36. GRB 060223: Swift XRT Team preliminary analysis
  37. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  38. GRB 060223B: Swift detection of a bright burst
  39. GRB 060223: Swift-BAT refined analysis
  40. Correction to GCN 4816 on GRB060218
  41. GRB 060218/SN 2006aj: optical observations
  42. GRB060218: Optical brightening in V and R
  43. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  44. Spectral properties of GRB060218/SN2006aj
  45. GRB 060219: Swift-BAT refined analysis
  46. GRB 060218: rebrightening
  47. GRB 060218: emergence of the underlying SN spectrum
  48. GRB 060218: Decline in r-band flux
  49. GRB 060218: spectroscopic observations
  50. GRB 060218: Further refined analysis of the Swift-BAT burst
  51. GRB 060218: Likely an underluminous GRB
  52. GRB060218: Optical Spectroscopy of GRB-SN
  53. GRB060218: VLT spectroscopy
  54. GRB 060218: Optical Observations at Xinglong Obs.
  55. GRB 060219: SDSS galaxy inside XRT error circle
  56. GRB060218: UV Detection and Light Curves
  57. GRB060219: SARA Observations
  58. GRB 060219: Swift/UVOT Upper Limits
  59. GRB 060219: Swift-XRT Team refined analysis
  60. GRB 051221B: Swift-XRT Team Refined Analysis
  61. GRB 060219: Partial refined analysis of the Swift-BAT burst
  62. GRB060218: Radio Afterglow Discovery
  63. GRB 060219: Swift-XRT position typo correction
  64. GRB 060219: Swift-XRT position
  65. GRB 060218: optical/nIR observations at La Palma
  66. GRB060219: SDSS pre-burst observations
  67. Oddball GRB 060218, transient or GRB?
  68. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  69. Brightening of the Optical Counterpart of the Possible GRB 060218
  70. GRB 060218: MDM Observations
  71. GRB 060218: Pre-burst detection of a possible host galaxy
  72. GRB 060218A: ROTSE-III Possible Optical Flare
  73. GRB060218: Swift/XRT refined position of a possible burst
  74. Preliminary refined analysis of the Swift-BAT trigger 191157
  75. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  76. GRB 060211B: Swift/UVOT Upper Limits
  77. GRB060218 : SDSS pre-burst observations
  78. GRB 060218: Swift XRT Position
  79. GRB 060213: optical afterglow not confirmed
  80. Swift UVOT observations of GRB060213
  81. GRB 060211B: Skynet Observations
  82. GRB 060213: optical afterglow candidate
  83. GRB060213: Swift XRT observations and possible afterglow candidate
  84. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  85. GRB060213: MASTER final result
  86. GRB 060211b: WIRO NIR Observations
  87. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  88. Konus-Wind observation of bright hard GRB 060213
  89. GRB 060210: Radio Observations
  90. GRB 060211a: WIRO NIR Observations
  91. GRB060211B: REM optical and NIR observations
  92. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  93. GRB 060211A: Further refined analysis of the Swift burst
  94. GRB060121: optical observations
  95. GRB060110: optical observations
  96. GRB060105: optical observations
  97. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  98. GRB 060211b: P60 Observations
  99. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  100. GRB 060206: SOAR Detections

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