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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"

37171 results found.

  1. IBAS Alert n. 3422: not a GRB
  2. GRB 060729: An update on the Swift XRT and UVOT observations
  3. GRB060717: optical observations
  4. GRB060807: Optical limiting magnitudes
  5. GRB 060805B: optical observation at Sierra Nevada
  6. GRB 060805B: XRT Team Analysis
  7. VLA Upper Limit on Outburst of SGR 1806-20
  8. GRB 060807: UVOT Upper limits
  9. GRB 060807: afterglow confirmation
  10. GRB 060807: XRT Team refined analysis
  11. GRB 060807: K- and R-band observations
  12. GRB 060807: Refined analysis of the Swift-BAT burst
  13. GRB060807: optical afterglow candidate
  14. GRB 060805B: RHESSI Spectral Fit
  15. GRB060807: optical upper limit in white light
  16. IPN triangulation of GRB060806 (long, exceptionally bright)
  17. GRB060807 - SDSS Pre-burst Observations
  18. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  19. GRB 060805B: Swift/UVOT Upper Limits
  20. GRB 060807, optical observation
  21. GRB 060807: Kanazawa R-band observation
  22. GRB 060807: optical limit
  23. GRB 060807: Swift detection of a burst
  24. GRB 060801: Second Epoch WSRT Radio Observations
  25. IPN triangulation of GRB060805B
  26. GRB 060805: optical upper limit in R
  27. GRB 060805: XRT Team Refined Analysis
  28. GRB 060805: Swift-BAT Refined Analysis
  29. GRB 060805: Swift/UVOT Upper Limits
  30. GRB 060805: P60 Observations
  31. GRB 060805: KAIT observations
  32. GRB 060805 - SDSS Pre-Burst Observations
  33. GRB 060805: Swift detection of a burst
  34. GRB 060804: Swift UVOT observations
  35. GRB 060804: Swift-XRT Team Refined Analysis
  36. GRB 060804: Refined analysis of the Swift-BAT burst
  37. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  38. GRB 060728: Upper limits of the X-ray emission
  39. GRB 060801: no variability of optical sources
  40. IBAS Alert 3418: not a GRB
  41. GRB 060801: WSRT Radio Observations
  42. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  43. GRB060801: Radio Observations
  44. GRB 051109B: Bright spiral host galaxy at low redshift
  45. GRB 060801: optical observations at FORS2/VLT
  46. GRB060801: Swift/UVOT Upper Limits
  47. GRB 060801: optical observations at Hanle and Calar Alto
  48. GRB060801: optical upper limit in R
  49. GRB 060801: Swift XRT refined analysis
  50. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  51. GRB 060801, optical observation
  52. GRB 060801: Kanazawa Optical Observation
  53. GRB 060801: Swift detection of a short burst
  54. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  55. GRB 060218 / SN 2006aj Nebular Spectrum
  56. IBAS Alert n. 3415: not a GRB
  57. Swift-BAT trigger 221873 is not a GRB or a Transient
  58. GRB 060729 redshift
  59. GRB 060719: TORTOREM optical upper limits
  60. GRB 060729: Swift/UVOT Detections
  61. GRB 060729: Refined analysis of the Swift-BAT burst
  62. GRB 060729: Swift-XRT refined analysis
  63. GRB 060729 : Planned XMM-Newton observation
  64. GRB 060729: Swift/UVOT Observations
  65. GRB 060729: ROTSE-III Detection of Optical Counterpart
  66. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  67. GRB 060728: Swift/UVOT Upper Limits
  68. GRB 060728: Refined analysis of the Swift-BAT burst
  69. GRB 060728, SMARTS optical/IR observations
  70. Swift/XRT preliminary analysis
  71. GRB 060728: Swift detection of a burst
  72. GRB060614 ATCA Radio Limits
  73. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  74. GRB 060714: Swift/UVOT Observations
  75. GRB060719: prompt NIR observations with REM
  76. GRB 060714: NOT observations
  77. GRB 060719: near-infrared afterglow
  78. GRB 060719: correction to the coordinates reported in GCN 5347
  79. GRB 060522: VLA observation
  80. GRB 060719: Swift/UVOT Upper Limits
  81. GRB 060719: VLT/ISAAC observations
  82. GRB 060719: Refined analysis of the Swift-BAT burst
  83. GRB 060719: XRT refined analysis
  84. GRB 060719: further analysis of VLT observations
  85. GRB 060719: optical limit by Pi-of-the-Sky
  86. GRB060719: FRAM early follow-up limit
  87. GRB 060719: prompt PROMPT observations
  88. GRB060719: REM NIR Observations
  89. GRB 060719: Continued LCO optical observations
  90. GRB 060719: VLT observations
  91. GRB 060719: LCO optical observations
  92. GRB 060719: Swift detection of a burst
  93. GRB 060717: Swift XRT refined analysis
  94. GRB 060714: OA fading and a possible host detection
  95. GRB060714: optical observations
  96. GRB 060717: NOT observations
  97. GRB 060714: Refined analysis of the Swift-BAT burst
  98. GRB 060717 optical upper limit
  99. GRB060717: Swift/UVOT upper limits
  100. GRB 060717: Swift XRT refined position

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