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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"
  1. GRB 060602A: Swift-BAT Refined Analysis: Correction
  2. GRB 060602B: XMM-Newton Survey Source
  3. GRB 060602B: Swift-XRT Refined Analysis
  4. GRB 060602B: Swift-BAT Refined Analysis
  5. GRB 060602B: Swift/UVOT observations
  6. GRB 060602A: Swift-BAT Refined Analysis
  7. GRB 060602B: RTT150 optical observations
  8. GRB 060211A : WIDGET simultaneous optical observations
  9. GRB060602A: optical observations(/transient?)
  10. GRB 060526: Tautenburg Second Epoch Observations
  11. GRB060602A: Bootes-IR observations
  12. GRB 060602B: Swift detection of a burst
  13. GRB060602B: Watcher observations - no OT candidate
  14. GRB060602B: BOOTES-IR candidate afterglow
  15. GRB060602 - SDSS Pre-Burst Observations
  16. GRB 060602: Swift detection of a burst
  17. GRB 060502A: Optical afterglow observations
  18. GRB 060526: Break in X-ray light curve
  19. GRB 060526: RTT150 optical observations
  20. GRB060526, optical observations
  21. GRB 051227 : WIDGET simultaneous optical observations
  22. GRB 051028 : WIDGET pre-trigger limit
  23. GRB 060526: RTT150 optical observations
  24. GRB 060526: Multiple Optical Flares
  25. GRB060526: afterglow fitting and probable jet break
  26. GRB 060526: RTT150 optical observations
  27. GRB060526: Optical counterpart from MIRO
  28. GRB060502b: optical observations
  29. GRB 060526: RTT150 optical observations
  30. GRB 060526: Tautenburg OT observation and light curve fitting
  31. GRB060526: optical observations
  32. GRB 060526: SMARTS optical/IR afterglow observations
  33. GRB060526: possible break in the optical light curve
  34. GRB 060526: REM observations
  35. GRB 060526: RTT150 optical observations, afterglow flattening
  36. GRB 060526: Optical Flare
  37. GRB 060526: MDM-2.4m Observations
  38. GRB 060526: Refined analysis of the Swift-BAT burst
  39. GRB 060526: RTT150 optical observations
  40. GRB060526: Further Swift-UVOT Observations
  41. GRB060526, optical observations
  42. GRB 060526: Magellan Redshift
  43. GRB 060526 Lulin optical observation
  44. GRB 060526: Swift/XRT Team refined analysis
  45. GRB 060526: TNG optical observations
  46. GRB 060526: ROTSE-III Observations of Optical Counterpart
  47. GRB 060526: Watcher Observations
  48. GRB060526 - SDSS Pre-burst Observations
  49. GRB 060526: Continued emission for the Swift burst
  50. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  51. GRB060505: VLT observations of the optical afterglow
  52. GRB 060413 : WIDGET simultaneous optical observations
  53. GRB 060522: Swift/UVOT Observations: Correction
  54. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  55. XMM-Newton observation of GRB060510b
  56. GRB060512: Late-Time P200 Observations
  57. GRB060522: z = 5.11 Keck-LRIS Redshift
  58. GRB 060522: Swift/XRT Team refined analysis
  59. GRB 060522: Swift-BAT Refined Analysis
  60. GRB 060522: REM NIR observations
  61. GRB 060522: TNG optical observations
  62. GRB 060522: Swift detection of a burst with possible optical afterglow
  63. GRB 060512: reanalysis of optical spectra
  64. GRB 060515: NIR observation
  65. GRB 060210: Jet Break in the XRT light curve
  66. GRB 060516: Refined analysis of the Swift-BAT burst
  67. GRB 060512: TNG optical spectroscopy
  68. GRB 060516: Swift detection of a burst
  69. GRB060515: P200 NIR Observations
  70. GRB 060505 BAT refined analysis
  71. GRB 060515 BAT refined analysis
  72. GRB 060512: TAROT optical observation
  73. GRB 060515: Swift/XRT Team refined analysis
  74. GRB 060515: Swift/UVOT Upper Limits
  75. GRB 060515: Swift/XRT position
  76. GRB 060515: Super-LOTIS Observations
  77. GRB060515: Swift/UVOT initial observation
  78. GRB 060515: TAROT optical observation
  79. GRB 060515: ROTSE-III Optical Limits
  80. GRB 060515: Swift detection of a burst
  81. VLT optical spectroscopy of GRB 060512
  82. Swift/UVOT observations of GRB060512.
  83. GRB 060512: Subaru NIR observation
  84. GRB060512: Swift XRT Team refined analysis
  85. GRB 060512: 1.54m Kuiper Observations
  86. GRB 060512: Detection of NIR afterglow
  87. GRB 060512: P60 Observations
  88. GRB 060512: Swift-BAT Refined Analysis
  89. GRB 060505 - OT candidate + galaxy spectrum
  90. GRB 060512: optical decay
  91. GRB 060512: REM NIR observations
  92. GRB060512 - SDSS Pre-Burst Observations
  93. GRB060512 Name Correction: LT Afterglow detection
  94. GRB060512: Liverpool Telescope Afterglow detection
  95. GRB 060512: Swift detection of a burst with an optical afterglow
  96. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  97. GRB 060505: X-ray afterglow - Correction -
  98. GRB 060505: X-ray afterglow
  99. Konus-Wind observation of GRB 060510A
  100. GRB060418: optical observations

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