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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"

37586 results found.

  1. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  2. GRB 060805B: Swift/UVOT Upper Limits
  3. GRB 060807, optical observation
  4. GRB 060807: Kanazawa R-band observation
  5. GRB 060807: optical limit
  6. GRB 060807: Swift detection of a burst
  7. GRB 060801: Second Epoch WSRT Radio Observations
  8. IPN triangulation of GRB060805B
  9. GRB 060805: optical upper limit in R
  10. GRB 060805: XRT Team Refined Analysis
  11. GRB 060805: Swift-BAT Refined Analysis
  12. GRB 060805: Swift/UVOT Upper Limits
  13. GRB 060805: P60 Observations
  14. GRB 060805: KAIT observations
  15. GRB 060805 - SDSS Pre-Burst Observations
  16. GRB 060805: Swift detection of a burst
  17. GRB 060804: Swift UVOT observations
  18. GRB 060804: Swift-XRT Team Refined Analysis
  19. GRB 060804: Refined analysis of the Swift-BAT burst
  20. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  21. GRB 060728: Upper limits of the X-ray emission
  22. GRB 060801: no variability of optical sources
  23. IBAS Alert 3418: not a GRB
  24. GRB 060801: WSRT Radio Observations
  25. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  26. GRB060801: Radio Observations
  27. GRB 051109B: Bright spiral host galaxy at low redshift
  28. GRB 060801: optical observations at FORS2/VLT
  29. GRB 060801: optical observations at Hanle and Calar Alto
  30. GRB060801: optical upper limit in R
  31. GRB 060801: Swift XRT refined analysis
  32. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  33. GRB 060801, optical observation
  34. GRB 060801: Kanazawa Optical Observation
  35. GRB 060801: Swift detection of a short burst
  36. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  37. GRB 060218 / SN 2006aj Nebular Spectrum
  38. IBAS Alert n. 3415: not a GRB
  39. Swift-BAT trigger 221873 is not a GRB or a Transient
  40. GRB 060729 redshift
  41. GRB 060719: TORTOREM optical upper limits
  42. GRB 060729: Swift/UVOT Detections
  43. GRB 060729: Refined analysis of the Swift-BAT burst
  44. GRB 060729: Swift-XRT refined analysis
  45. GRB 060729 : Planned XMM-Newton observation
  46. GRB 060729: Swift/UVOT Observations
  47. GRB 060729: ROTSE-III Detection of Optical Counterpart
  48. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  49. GRB 060728: Swift/UVOT Upper Limits
  50. GRB 060728: Refined analysis of the Swift-BAT burst
  51. GRB 060728, SMARTS optical/IR observations
  52. GRB 060728: Swift detection of a burst
  53. GRB060614 ATCA Radio Limits
  54. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  55. GRB 060714: Swift/UVOT Observations
  56. GRB 060714: NOT observations
  57. GRB 060719: near-infrared afterglow
  58. GRB 060719: correction to the coordinates reported in GCN 5347
  59. GRB 060522: VLA observation
  60. GRB 060719: Swift/UVOT Upper Limits
  61. GRB 060719: VLT/ISAAC observations
  62. GRB 060719: Refined analysis of the Swift-BAT burst
  63. GRB 060719: XRT refined analysis
  64. GRB 060719: further analysis of VLT observations
  65. GRB 060719: optical limit by Pi-of-the-Sky
  66. GRB060719: FRAM early follow-up limit
  67. GRB 060719: prompt PROMPT observations
  68. GRB060719: REM NIR Observations
  69. GRB 060719: Continued LCO optical observations
  70. GRB 060719: VLT observations
  71. GRB 060719: LCO optical observations
  72. GRB 060719: Swift detection of a burst
  73. GRB 060717: Swift XRT refined analysis
  74. GRB 060714: OA fading and a possible host detection
  75. GRB060714: optical observations
  76. GRB 060717: NOT observations
  77. GRB 060714: Refined analysis of the Swift-BAT burst
  78. GRB 060717 optical upper limit
  79. GRB060717: Swift/UVOT upper limits
  80. GRB 060717: Swift XRT refined position
  81. GRB 060717: Swift-BAT refined analysis
  82. GRB060717 - SDSS Pre-burst Observations
  83. GRB 060714: REM infrared observations
  84. GRB 060717, optical observation
  85. GRB 060717: Swift detection of a burst
  86. GRB060714: correction to GCN 5324
  87. GRB060714: optical observations
  88. GRB 060714, SMARTS optical/IR afterglow observation
  89. GRB 060714 : Liverpool Telescope Observations
  90. GRB 060714: Swift XRT refined analysis
  91. GRB 060714: OA redshift
  92. GRB 060708: VLT spectroscopy
  93. GRB060708: MARGE low resolution spectrum observations
  94. GRB060714: optical observations
  95. Swift-BAT trigger 219136 is not a GRB
  96. Correction to Circular 5314: Circular refers to GRB 060714
  97. GRB060707 possible optical confirmation
  98. Swift trigger 219136 is probably not a GRB
  99. GRB 060714, optical observation
  100. GRB 060714: Swift detection of a burst with an UVOT optical afterglow

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