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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"

20380 results found.

  1. GRB 060919: TAROT optical observations
  2. GRB 060912A: VLA Observation
  3. GRB 060912A: Probable Host Galaxy
  4. GRB 060912: Correction to GCN 5559
  5. VLA observations of GRB 060908
  6. GRB 060908 - SDSS Pre-burst Observations
  7. GRB 060904B: Kiso Optical observation
  8. GRB 060904A : Optical limit
  9. GRB 060908: REM optical prompt observation
  10. GRB 060908: Swift detection of a burst with a bright optical counterpart
  11. GRB060906 , optical observation
  12. GRB 060906: Early RAPTOR optical limits
  13. GRB 060906, Swift-BAT refined spectral analysis
  14. GRB 060906: Swift/XRT Refined Analysis
  15. GRB 060906, Swift-BAT refined analysis
  16. GRB 060906: Confirmation of P60 Optical Afterglow
  17. GRB 060906 (?): P60 Optical Afterglow Candidate
  18. GRB060904b, optical observations
  19. GRB 060904b: SMARTS optical/IR afterglow observations
  20. GRB060904A: Swift/UVOT optical observations
  21. GRB 060904A: Subaru NIR observation
  22. GRB 060904A: Refined analysis of the Swift-BAT burst
  23. GRB 060904A: Suzaku-XIS and -HXD observation plan
  24. GRB 060904A: P60 Observations
  25. GRB 060904B: TAROT optical counterpart observations
  26. GRB060904B - SDSS Pre-Burst Observations
  27. GRB 060904: TAROT optical observations
  28. GRB 060904B: Swift detection of a burst with optical counterpart
  29. GRB060904 - SDSS Pre-Burst Observations
  30. GRB 060904: Swift detection of a bright burst
  31. GRB060901: Optical observations
  32. 060901: Swift UVOT followup observations
  33. GRB 060901: Swift/XRT Refined Analysis
  34. GRB 060605, observations using an Integral Field Unit
  35. GRB 060604: VLA Observation
  36. GRB 060605: VLA Observation
  37. GRB 060707: VLA observation
  38. GRB 060825: VLA observations
  39. GRB060826 - SDSS Pre-Burst Observations
  40. GRB 060826(?): Swift detection of a possible burst
  41. GRB 060825: XRT Team Refined Analysis
  42. GRB 060825: Swift-BAT Refined Analysis
  43. GRB 060825: TNG optical observations
  44. GRB 060825: TAROT optical observations
  45. GRB 060825: P60 Observations
  46. GRB 060729, SMARTS optical/IR observations
  47. Konus-Wind observation of GRB 060814
  48. GRB 060814: P60 Observations
  49. GRB 060814: P200 NIR Observations
  50. GRB 060814: Swift XRT refined analysis
  51. GRB 060814: VLT optical limits
  52. GRB 060814 - SDSS Pre-Burst Observations
  53. GRB 060814: TAROT optical observations
  54. GRB 060814: Swift detection of a bright burst
  55. GRB 060813: Swift XRT refined analysis
  56. GRB 060813: Swift detection of a burst
  57. GRB051109B: Late-time Radio Observations
  58. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  59. GRB 060729: An update on the Swift XRT and UVOT observations
  60. GRB060717: optical observations
  61. GRB 060805B: XRT Team Analysis
  62. GRB060806 is similar to previous activity of SGR1806-20
  63. GRB 060807: XRT Team refined analysis
  64. GRB 060807: Refined analysis of the Swift-BAT burst
  65. GRB060807: optical afterglow candidate
  66. GRB 060805B: RHESSI Spectral Fit
  67. IPN triangulation of GRB060806 (long, exceptionally bright)
  68. GRB060807 - SDSS Pre-burst Observations
  69. GRB 060805B: Swift/UVOT Upper Limits
  70. GRB 060807, optical observation
  71. GRB 060807: Kanazawa R-band observation
  72. GRB060805 Liverpool Telescope observations
  73. GRB 060805: XRT Team Refined Analysis
  74. GRB 060805: Swift/UVOT Upper Limits
  75. GRB 060805: P60 Observations
  76. GRB 060805 - SDSS Pre-Burst Observations
  77. GRB 060804: Swift UVOT observations
  78. GRB 060804: Refined analysis of the Swift-BAT burst
  79. GRB 060728: Upper limits of the X-ray emission
  80. GRB 060801: no variability of optical sources
  81. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  82. GRB060801: Radio Observations
  83. GRB 051109B: Bright spiral host galaxy at low redshift
  84. GRB060801: Swift/UVOT Upper Limits
  85. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  86. GRB 060801, optical observation
  87. GRB 060801: Kanazawa Optical Observation
  88. GRB 060719: TORTOREM optical upper limits
  89. GRB 060729: Refined analysis of the Swift-BAT burst
  90. GRB 060729: Swift/UVOT Observations
  91. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  92. GRB 060728: Swift/UVOT Upper Limits
  93. GRB 060728, SMARTS optical/IR observations
  94. Swift/XRT preliminary analysis
  95. GRB 060728: Swift detection of a burst
  96. GRB 060714: Swift/UVOT Observations
  97. GRB060719: prompt NIR observations with REM
  98. GRB 060714: NOT observations
  99. GRB 060719: near-infrared afterglow
  100. GRB 060522: VLA observation

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