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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"

36394 results found.

  1. IPN triangulation of GRB060806 (long, exceptionally bright)
  2. GRB060807 - SDSS Pre-burst Observations
  3. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  4. GRB 060805B: Swift/UVOT Upper Limits
  5. GRB 060807, optical observation
  6. GRB 060807: Kanazawa R-band observation
  7. GRB 060807: optical limit
  8. GRB 060807: Swift detection of a burst
  9. GRB 060801: Second Epoch WSRT Radio Observations
  10. IPN triangulation of GRB060805B
  11. GRB 060805: optical upper limit in R
  12. GRB 060805: XRT Team Refined Analysis
  13. GRB 060805: Swift-BAT Refined Analysis
  14. GRB 060805: Swift/UVOT Upper Limits
  15. GRB 060805: P60 Observations
  16. GRB 060805: KAIT observations
  17. GRB 060805 - SDSS Pre-Burst Observations
  18. GRB 060805: Swift detection of a burst
  19. GRB 060804: Swift UVOT observations
  20. GRB 060804: Swift-XRT Team Refined Analysis
  21. GRB 060804: Refined analysis of the Swift-BAT burst
  22. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  23. GRB 060728: Upper limits of the X-ray emission
  24. GRB 060801: no variability of optical sources
  25. IBAS Alert 3418: not a GRB
  26. GRB 060801: WSRT Radio Observations
  27. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  28. GRB060801: Radio Observations
  29. GRB 051109B: Bright spiral host galaxy at low redshift
  30. GRB 060801: optical observations at FORS2/VLT
  31. GRB 060801: optical observations at Hanle and Calar Alto
  32. GRB060801: optical upper limit in R
  33. GRB 060801: Swift XRT refined analysis
  34. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  35. GRB 060801, optical observation
  36. GRB 060801: Kanazawa Optical Observation
  37. GRB 060801: Swift detection of a short burst
  38. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  39. GRB 060218 / SN 2006aj Nebular Spectrum
  40. IBAS Alert n. 3415: not a GRB
  41. Swift-BAT trigger 221873 is not a GRB or a Transient
  42. GRB 060729 redshift
  43. GRB 060719: TORTOREM optical upper limits
  44. GRB 060729: Swift/UVOT Detections
  45. GRB 060729: Refined analysis of the Swift-BAT burst
  46. GRB 060729: Swift-XRT refined analysis
  47. GRB 060729 : Planned XMM-Newton observation
  48. GRB 060729: Swift/UVOT Observations
  49. GRB 060729: ROTSE-III Detection of Optical Counterpart
  50. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  51. GRB 060728: Swift/UVOT Upper Limits
  52. GRB 060728: Refined analysis of the Swift-BAT burst
  53. GRB 060728, SMARTS optical/IR observations
  54. GRB 060728: Swift detection of a burst
  55. GRB060614 ATCA Radio Limits
  56. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  57. GRB 060714: Swift/UVOT Observations
  58. GRB 060714: NOT observations
  59. GRB 060719: near-infrared afterglow
  60. GRB 060719: correction to the coordinates reported in GCN 5347
  61. GRB 060522: VLA observation
  62. GRB 060719: Swift/UVOT Upper Limits
  63. GRB 060719: VLT/ISAAC observations
  64. GRB 060719: Refined analysis of the Swift-BAT burst
  65. GRB 060719: XRT refined analysis
  66. GRB 060719: further analysis of VLT observations
  67. GRB 060719: optical limit by Pi-of-the-Sky
  68. GRB060719: FRAM early follow-up limit
  69. GRB 060719: prompt PROMPT observations
  70. GRB060719: REM NIR Observations
  71. GRB 060719: Continued LCO optical observations
  72. GRB 060719: VLT observations
  73. GRB 060719: LCO optical observations
  74. GRB 060719: Swift detection of a burst
  75. GRB 060717: Swift XRT refined analysis
  76. GRB 060714: OA fading and a possible host detection
  77. GRB060714: optical observations
  78. GRB 060717: NOT observations
  79. GRB 060714: Refined analysis of the Swift-BAT burst
  80. GRB 060717 optical upper limit
  81. GRB060717: Swift/UVOT upper limits
  82. GRB 060717: Swift XRT refined position
  83. GRB 060717: Swift-BAT refined analysis
  84. GRB060717 - SDSS Pre-burst Observations
  85. GRB 060714: REM infrared observations
  86. GRB 060717, optical observation
  87. GRB 060717: Swift detection of a burst
  88. GRB060714: correction to GCN 5324
  89. GRB060714: optical observations
  90. GRB 060714, SMARTS optical/IR afterglow observation
  91. GRB 060714 : Liverpool Telescope Observations
  92. GRB 060714: Swift XRT refined analysis
  93. GRB 060714: OA redshift
  94. GRB 060708: VLT spectroscopy
  95. GRB060708: MARGE low resolution spectrum observations
  96. GRB060714: optical observations
  97. Swift-BAT trigger 219136 is not a GRB
  98. Correction to Circular 5314: Circular refers to GRB 060714
  99. GRB060707 possible optical confirmation
  100. Swift trigger 219136 is probably not a GRB

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