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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"

19065 results found.

  1. GRB 060707: VLA observation
  2. GRB 060825: VLA observations
  3. GRB060826 - SDSS Pre-Burst Observations
  4. GRB 060826(?): Swift detection of a possible burst
  5. GRB 060825: TNG optical observations
  6. GRB 060825: TAROT optical observations
  7. GRB 060825: P60 Observations
  8. GRB 060825: Swift detection of a burst
  9. GRB060801: host galaxy redshift
  10. GRB 060729, SMARTS optical/IR observations
  11. GRB 060814: P60 Observations
  12. GRB 060814: P200 NIR Observations
  13. GRB 060814: VLT optical limits
  14. GRB 060814 - SDSS Pre-Burst Observations
  15. GRB 060814: TAROT optical observations
  16. GRB 060814: Swift detection of a bright burst
  17. GRB 060813: Swift detection of a burst
  18. GRB051109B: Late-time Radio Observations
  19. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  20. GRB 060729: An update on the Swift XRT and UVOT observations
  21. GRB060717: optical observations
  22. GRB 060805B: XRT Team Analysis
  23. VLA Upper Limit on Outburst of SGR 1806-20
  24. GRB060807: optical afterglow candidate
  25. IPN triangulation of GRB060806 (long, exceptionally bright)
  26. GRB060807 - SDSS Pre-burst Observations
  27. GRB 060805B: Swift/UVOT Upper Limits
  28. GRB 060807, optical observation
  29. GRB 060807: Kanazawa R-band observation
  30. GRB 060807: Swift detection of a burst
  31. IPN triangulation of GRB060805B
  32. GRB060805 Liverpool Telescope observations
  33. GRB 060805: Swift-BAT Refined Analysis
  34. GRB 060805: Swift/UVOT Upper Limits
  35. GRB 060805: P60 Observations
  36. GRB 060805 - SDSS Pre-Burst Observations
  37. GRB 060805: Swift detection of a burst
  38. GRB 060804: Swift UVOT observations
  39. GRB 060728: Upper limits of the X-ray emission
  40. GRB 060801: no variability of optical sources
  41. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  42. GRB060801: Radio Observations
  43. GRB 051109B: Bright spiral host galaxy at low redshift
  44. GRB060801: Swift/UVOT Upper Limits
  45. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  46. GRB 060801, optical observation
  47. GRB 060801: Kanazawa Optical Observation
  48. GRB 060719: TORTOREM optical upper limits
  49. GRB 060729: Swift/UVOT Observations
  50. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  51. GRB 060728: Swift/UVOT Upper Limits
  52. GRB 060728, SMARTS optical/IR observations
  53. Swift/XRT preliminary analysis
  54. GRB 060728: Swift detection of a burst
  55. GRB 060714: Swift/UVOT Observations
  56. GRB060719: prompt NIR observations with REM
  57. GRB 060714: NOT observations
  58. GRB 060719: near-infrared afterglow
  59. GRB 060522: VLA observation
  60. GRB 060719: Swift/UVOT Upper Limits
  61. GRB 060719: VLT/ISAAC observations
  62. GRB060719: REM NIR Observations
  63. GRB 060719: VLT observations
  64. GRB 060719: LCO optical observations
  65. GRB 060719: Swift detection of a burst
  66. GRB 060717: Swift XRT refined analysis
  67. GRB060717: Swift/UVOT upper limits
  68. GRB 060717: Swift-BAT refined analysis
  69. GRB060717 - SDSS Pre-burst Observations
  70. GRB 060714: REM infrared observations
  71. GRB 060717, optical observation
  72. GRB 060717: Swift detection of a burst
  73. GRB 060714 : Liverpool Telescope Observations
  74. GRB 060708: VLT spectroscopy
  75. Swift trigger 219136 is probably not a GRB
  76. GRB 060714, optical observation
  77. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  78. GRB060712: P60 Observations
  79. GRB 060712: Swift/UVOT Upper Limits
  80. GRB 060712: XRT refined position
  81. GRB 060707: OA fading and redshift
  82. GCN 060708: Swift-UVOT Observations
  83. GCN 060707: Swift-UVOT observations
  84. GRB 060708: Swift detection of a burst with an UVOT countpart
  85. GRB 060707: Swift detection of a burst
  86. GRB 060515: Upper Limit on Host Galaxy
  87. GRB 060109: Upper Limit on Host Galaxy
  88. GRB 060105: Upper limit on Host Galaxy
  89. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  90. GRB050326: Host Galaxy Candidates
  91. GRB050124: Possible Host Galaxy
  92. GRB050223: Host Galaxy
  93. GRB060605: optical observation
  94. GRB 060605, optical observations
  95. GRB 060614: Swift/UVOT Observations
  96. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  97. GRB 060602A: Swift/XRT analysis
  98. GRB 060610: KAIT observations
  99. GRB 060607: RTT150 optical observations
  100. GRB060602A: Swift/UVOT upper limits

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