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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"

35441 results found.

  1. GRB060614: Watcher observation
  2. GRB 060614: Swift-BAT refined analysis
  3. GRB 060614: Swift/UVOT Observations
  4. GRB 060604, optical observations
  5. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  6. GRB 060602A: Swift/XRT analysis
  7. GRB 060610: KAIT observations
  8. GRB 060607: RTT150 optical observations
  9. GRB 070706B: Watcher upper limit
  10. GRB 060607B: Swift-BAT Refined Analysis
  11. GRB 060607B: Swift detection of a burst
  12. GCN 060607: Swift-UVOT obswervations.
  13. GRB 060607: Swift-BAT Refined Analysis
  14. GRB 060607: optical limit by "Pi of the Sky"
  15. GRB 060607: Swift-XRT Team refined analysis
  16. GRB 060607: IR observations
  17. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  18. VLT/UVES observations of GRB 060607
  19. GRB 060607: PROMPT Observations
  20. GRB 060605: RTT150 optical observations
  21. GRB 060607: REM NIR afterglow
  22. GRB 060607: Swift detection of a burst with bright optical counterpart
  23. GRB 060522: PROMPT Optical Limits
  24. GRB 060605 BAT refined analysis
  25. GRB 060605: Xinglong TNT optical observations
  26. GRB060602B : REM infrared observations
  27. GRB060605: Swift/UVOT detections
  28. GRB 060605: Swift-XRT Team refined analysis
  29. SALT spectroscopy of GRB 060605
  30. GRB 060605: TNG optical observations
  31. GRB 060605: RTT150 optical observations
  32. GRB 060605: ROTSE-III Optical Counterpart
  33. GRB 060605: Swift detection of a burst with optical counterpart
  34. GRB 060605: ROTSE-III Detection of Optical Counterpart
  35. GRB 060604: redshift
  36. GRB 060512: Keck Redshift
  37. GRB 060604 optical photometry
  38. GRB 060604: Swift-XRT Team refined analysis
  39. GRB 060604: BAT refined analysis
  40. GRB 060604A: ROTSE-III Optical Limits
  41. GRB 060604: Swift detection of a burst with possible optical counterpart
  42. GRB 060602A: Swift-BAT Refined Analysis: Correction
  43. GRB 060602B: XMM-Newton Survey Source
  44. GRB 060602B: Swift-XRT Refined Analysis
  45. GRB 060602B: Swift-BAT Refined Analysis
  46. GRB 060602B: Swift/UVOT observations
  47. GRB 060602A: Swift-BAT Refined Analysis
  48. GRB 060602B: RTT150 optical observations
  49. GRB 060211A : WIDGET simultaneous optical observations
  50. GRB060602A: optical observations(/transient?)
  51. GRB 060526: Tautenburg Second Epoch Observations
  52. GRB060602A: Bootes-IR observations
  53. GRB 060602B: Swift detection of a burst
  54. GRB060602B: Watcher observations - no OT candidate
  55. GRB060602B: BOOTES-IR candidate afterglow
  56. GRB060602 - SDSS Pre-Burst Observations
  57. GRB 060602: Swift detection of a burst
  58. GRB 060502A: Optical afterglow observations
  59. GRB 060526: Break in X-ray light curve
  60. GRB 060526: RTT150 optical observations
  61. GRB060526, optical observations
  62. GRB 051227 : WIDGET simultaneous optical observations
  63. GRB 051028 : WIDGET pre-trigger limit
  64. GRB 060526: RTT150 optical observations
  65. GRB 060526: Multiple Optical Flares
  66. GRB060526: afterglow fitting and probable jet break
  67. GRB 060526: RTT150 optical observations
  68. GRB060502b: optical observations
  69. GRB 060526: RTT150 optical observations
  70. GRB 060526: Tautenburg OT observation and light curve fitting
  71. GRB060526: optical observations
  72. GRB 060526: SMARTS optical/IR afterglow observations
  73. GRB 060526: REM observations
  74. GRB 060526: RTT150 optical observations, afterglow flattening
  75. GRB 060526: Optical Flare
  76. GRB 060526: MDM-2.4m Observations
  77. GRB 060526: Refined analysis of the Swift-BAT burst
  78. GRB 060526: RTT150 optical observations
  79. GRB060526, optical observations
  80. GRB 060526: Magellan Redshift
  81. GRB 060526 Lulin optical observation
  82. GRB 060526: Swift/XRT Team refined analysis
  83. GRB 060526: TNG optical observations
  84. GRB 060526: ROTSE-III Observations of Optical Counterpart
  85. GRB 060526: Watcher Observations
  86. GRB060526 - SDSS Pre-burst Observations
  87. GRB 060526: Continued emission for the Swift burst
  88. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  89. GRB 060413 : WIDGET simultaneous optical observations
  90. GRB 060522: Swift/UVOT Observations: Correction
  91. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  92. XMM-Newton observation of GRB060510b
  93. GRB 060522: Swift/XRT Team refined analysis
  94. GRB 060522: Swift-BAT Refined Analysis
  95. GRB 060522: REM NIR observations
  96. GRB 060522: TNG optical observations
  97. GRB 060522: Swift detection of a burst with possible optical afterglow
  98. GRB 060512: reanalysis of optical spectra
  99. GRB 060515: NIR observation
  100. GRB 060210: Jet Break in the XRT light curve

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