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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"

45650 results found.

  1. GRB 060312: Swift detection of a burst
  2. IBAS Alert n. 3218 : not a real GRB
  3. GRB 060306: SOAR Ks Observations
  4. Bright short hard GRB 060303: IPN localization and Konus spectrum
  5. GRB060219: Liverpool Telescope observations
  6. GRB 060306: MAGNUM observations
  7. GRB060218: analysis of the XMM-Newton observation
  8. Swift/UVOT observations of GRB060306
  9. GRB 060306: Swift-BAT refined analysis
  10. GRB 060306: Swift-XRT team refined analysis
  11. GRB 060306: PROMPT Observations
  12. GRB 060306: Swift detection of a bright burst
  13. GRB 060218: RTT150 optical observations
  14. GRB060218: Ep,i - Eiso correlation
  15. GRB060218: R-band CCD photmetry
  16. GRB060223b: optical limit
  17. GRB060218/SN 2006aj: optical observation in V
  18. GRB060218/SN 2006aj: optical observation
  19. GRB 060121: HST observations
  20. GRB 060218 : GMRT observation [Correction and Improvement]
  21. GRB 060223b: Swift/UVOT Upper Limits
  22. GRB 060218/SN 2006aj: K-380 optical observations
  23. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  24. GRB200618: optical polarimetry and photometry
  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 060223A:Xinglong optical limits
  34. GRB 060223B: ART optical limits
  35. GRB 060223B: Swift-BAT refined analysis
  36. GRB 060223a: Swift/UVOT refined analysis
  37. GRB 060223: Swift XRT Team preliminary analysis
  38. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  39. GRB 060223B: Swift detection of a bright burst
  40. GRB 060223: Swift-BAT refined analysis
  41. GRB 060218: rebrightening
  42. Correction to GCN 4816 on GRB060218
  43. GRB 060218/SN 2006aj: optical observations
  44. GRB060218: Optical brightening in V and R
  45. GRB 060223: Keck redshift
  46. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  47. GRB 060223: Swift detection of a burst
  48. Spectral properties of GRB060218/SN2006aj
  49. GRB 060219: Swift-BAT refined analysis
  50. GRB 060218: rebrightening
  51. GRB 060218: emergence of the underlying SN spectrum
  52. GRB 060218: Decline in r-band flux
  53. GRB 060218: spectroscopic observations
  54. GRB 060218: Further refined analysis of the Swift-BAT burst
  55. GRB 060218: Likely an underluminous GRB
  56. GRB060218: Optical Spectroscopy of GRB-SN
  57. GRB060218: VLT spectroscopy
  58. GRB 060218: Optical Observations at Xinglong Obs.
  59. GRB 060219: SDSS galaxy inside XRT error circle
  60. GRB060218: UV Detection and Light Curves
  61. GRB060219: SARA Observations
  62. GRB 060219: Swift/UVOT Upper Limits
  63. GRB 060219: Swift-XRT Team refined analysis
  64. GRB 051221B: Swift-XRT Team Refined Analysis
  65. GRB 060219: Partial refined analysis of the Swift-BAT burst
  66. GRB060218: Radio Afterglow Discovery
  67. GRB 060219: Swift-XRT position typo correction
  68. GRB 060218: MDM Redshift
  69. GRB 060219: Swift-XRT position
  70. GRB 060218: optical/nIR observations at La Palma
  71. GRB060219: SDSS pre-burst observations
  72. GRB 060219: Swift-BAT detection of a weak burst
  73. Oddball GRB 060218, transient or GRB?
  74. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  75. Brightening of the Optical Counterpart of the Possible GRB 060218
  76. GRB 060218: MDM Observations
  77. GRB 060218: Pre-burst detection of a possible host galaxy
  78. GRB 060218A: ROTSE-III Possible Optical Flare
  79. GRB060218: Swift/XRT refined position of a possible burst
  80. Preliminary refined analysis of the Swift-BAT trigger 191157
  81. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  82. GRB 060211B: Swift/UVOT Upper Limits
  83. GRB060218 : SDSS pre-burst observations
  84. GRB 060218: Swift XRT Position
  85. GRB 060218: Swift-BAT detection of a possible burst
  86. GRB 060213: optical afterglow not confirmed
  87. Swift UVOT observations of GRB060213
  88. GRB 060211B: Skynet Observations
  89. GRB 060213: optical afterglow candidate
  90. GRB060213: Swift XRT observations and possible afterglow candidate
  91. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  92. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  93. GRB060213: MASTER final result
  94. GRB 060211b: WIRO NIR Observations
  95. GRB060213:_MASTER_optical_observation
  96. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  97. Konus-Wind observation of bright hard GRB 060213
  98. GRB 060213: IPN localization
  99. GRB 060210: Radio Observations
  100. GRB 060211a: WIRO NIR Observations

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