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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"

23686 results found.

  1. GRB 060322: IAC80 optical observations
  2. GRB 060322: Swift XRT afterglow candidate
  3. GRB060323: P60 Observations
  4. GRB 060323: optical afterglow confirmed
  5. GRB060323: NOT observations
  6. GRB 060323: Optical Observations
  7. GRB 060323: optical observations at TNG
  8. GRB 060323: Swift XRT refined analysis
  9. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  10. GRB 060323: Swift/XRT position
  11. GRB 060322: Refined analysis of the Swift-BAT burst
  12. GRB060323 - SDSS Pre-Burst Observations
  13. GRB 060323: Swift detection of a burst with a possible optical afterglow
  14. GRB 060322: Swift-BAT detection of a 200-sec burst
  15. GRB060219: optical observation
  16. GRB060206: optical observation
  17. GRB060218/SN2006aj: optical observations
  18. GRB 060218/SN 2006aj, LNA optical observation
  19. GRB 060319: Re-analysis of TNG data
  20. GRB 060319 optical observations at TNG
  21. GRB060319 : Liverpool Telescope optical limit
  22. GRB060319 - SDSS Pre-burst Observations
  23. GRB 060319: Swift detection of a burst
  24. GRB060313: Radio Observations
  25. GRB 060313: PROMPT Observations
  26. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  27. GRB 060313, SMARTS optical/IR observations
  28. GRB060218: SARA Observations of SN2006aj
  29. GRB060306: APO Ks-band Imaging Observations
  30. GRB 060312: Swift detection of a burst
  31. GRB 060306: SOAR Ks Observations
  32. Bright short hard GRB 060303: IPN localization and Konus spectrum
  33. Swift/UVOT observations of GRB060306
  34. GRB 060306: PROMPT Observations
  35. GRB 060306: Swift detection of a bright burst
  36. GRB 060218: RTT150 optical observations
  37. GRB060223b: optical limit
  38. GRB060218/SN 2006aj: optical observation in V
  39. GRB200618: optical polarimetry and photometry
  40. GRB 060223B: Swift XRT possible afterglow
  41. GRB 060218/SN 2006aj: WIRO optical observations
  42. GRB 060218: Refined analysis of the radio afterglow
  43. GRB 060223B: Swift-BAT refined analysis
  44. GRB 060223: Swift XRT Team preliminary analysis
  45. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  46. GRB 060223B: Swift detection of a bright burst
  47. GRB 060218/SN 2006aj: optical observations
  48. GRB 060223: Keck redshift
  49. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  50. GRB 060223: Swift detection of a burst
  51. GRB 060218: rebrightening
  52. GRB 060218: Decline in r-band flux
  53. GRB 060218: spectroscopic observations
  54. GRB 060218: Likely an underluminous GRB
  55. GRB060218: Optical Spectroscopy of GRB-SN
  56. GRB060218: UV Detection and Light Curves
  57. GRB060219: SARA Observations
  58. GRB060218: Radio Afterglow Discovery
  59. GRB 060218: optical/nIR observations at La Palma
  60. GRB060219: SDSS pre-burst observations
  61. GRB060218 : SDSS pre-burst observations
  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. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  67. GRB060213: MASTER final result
  68. GRB 060211b: WIRO NIR Observations
  69. GRB060213:_MASTER_optical_observation
  70. GRB 060213: IPN localization
  71. GRB 060211a: WIRO NIR Observations
  72. GRB060121: optical observations
  73. GRB060110: optical observations
  74. GRB060105: optical observations
  75. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  76. GRB 060211b: P60 Observations
  77. GRB 060206: SOAR Detections
  78. GRB 050826: Optical Afterglow and Host Galaxy
  79. GRB060211b: optical observation
  80. GRB060211B: Swift/XRT position
  81. GRB 060210: Optical Observations
  82. GRB060211: Faulkes North observation
  83. GRB060206, optical observations
  84. GRB 060210 : Xinglong and Lulin optical limit
  85. GRB060210: Optical Observations
  86. GRB060210: Early Optical Observations
  87. GRB060210:Faulkes Telescope North Afterglow Confirmation
  88. GRB 060210: candidate afterglow
  89. GRB060209: RTT150 optical observations
  90. GRB 060209 : TAROT optical observation
  91. GRB060209A: MASTER optical observation
  92. GRB 060206: TTT Observations
  93. GRB 060206: More PROMPT Detections
  94. GRB 060121 : WIDGET Pre-trigger limit
  95. GRB 060206: Tenagra II Observations
  96. GRB 060206: PROMPT Detections
  97. GRB 060206: Subaru/FOCAS optical spectroscopy
  98. GRB 060206: Lick 3m Spectroscopy
  99. GRB 060206: Swift-BAT refined analysis
  100. GRB 060206 : Lulin optical observations

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