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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"

26053 results found.

  1. GRB(?) 060421: Swift detection of a burst
  2. Erratum of GCN 4983 for GRB 060418 IR follow-up
  3. GRB 060418 : IR afterglow observations
  4. GRB 060418 : Lulin Optical follow-up
  5. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  6. GRB 060418: Radio Observations
  7. GRB060418, BVRcIc field calibration
  8. GRB060418: Swift/UVOT Observations
  9. GRB060418: Optical Observations
  10. GRB 060418: FRAM early afterglow observation
  11. GRB 060418: Refined Analysis of the Swift-BAT burst
  12. VLT/UVES observations of GRB060418
  13. GRB060418: Swift XRT Team Refined Analysis
  14. GRB 060418, SMARTS continuing afterglow observations
  15. GRB 060418: PROMPT Detections
  16. GRB 060418, SMARTS optical/IR afterglow observations
  17. GRB060418: Magellan/MIKE Spectroscopic Redshift
  18. GRB060418 : LT optical afterglow observation
  19. GRB 060418: REM candidate afterglow
  20. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  21. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  22. GRB060413: Swift/UVOT upper limits
  23. GRB 060413: REM NIR Observations
  24. SGR 1900+14: Swift detection of an outburst
  25. GRB 060413: Refined analysis of the Swift-BAT burst
  26. GRB 060413: Watcher UBVR observations
  27. GRB 060413: XRT refined analysis
  28. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  29. GRB 060413: Swift detection of a burst
  30. GRB060403: optical observations
  31. GRB 060403 Optical observations
  32. GRB 060403: MITSuME optical observation
  33. GRB060403: Optical Limit
  34. GRB060403: XRT refined analysis
  35. GRB 060403: Swift/UVOT upper limits
  36. SGR 1900+14: BAT observations
  37. GRB 060403: Refined analysis of the Swift-BAT burst
  38. GRB060403: Swift XRT refined position
  39. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  40. GRB 060403: Swift detection of a burst
  41. GRB060331: Swift/UVOT upper limits
  42. Swift XRT observations of the HETE transient H4043
  43. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  44. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  45. SGR 1900+14: Swift-BAT detection of a bright outburst
  46. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  47. GRB 060323 : WIDGET simultaneous optical observations
  48. GRB 060322: Confirmation of Swift XRT afterglow
  49. GRB 060211A: optical observation
  50. GRB060323: optical limit
  51. GRB060211B: optical observation
  52. SGR 1900+14: CORRECTION to GCN 4923
  53. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  54. SGR 1900+14: Swift detection of renewed activity
  55. GRB060323: NOT optical observations
  56. GRB 060322: IAC80 optical observations
  57. GRB 060322: Swift XRT afterglow candidate
  58. GRB060323: P60 Observations
  59. GRB 060323: Swift/UVOT Observations
  60. GRB 060323: optical afterglow confirmed
  61. GRB060323: NOT observations
  62. GRB 060323: Optical Observations
  63. GRB 060323: Tautenburg OT candidate retraction
  64. GRB 060323: Refined analysis of the Swift-BAT burst
  65. GRB 060323: optical observations at TNG
  66. GRB 060323: Swift XRT refined analysis
  67. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  68. GRB 060323: Swift/XRT position
  69. GRB 060322: Refined analysis of the Swift-BAT burst
  70. GRB060323 - SDSS Pre-Burst Observations
  71. GRB 060323: Swift detection of a burst with a possible optical afterglow
  72. GRB 060322: Swift-BAT detection of a 200-sec burst
  73. GRB060219: optical observation
  74. GRB060206: optical observation
  75. GRB 060319: WHT K-band candidate afterglow
  76. GRB 060319: IAC-80 optical observations
  77. GRB060319: Swift XRT refined analysis
  78. GRB060319: Swift/UVOT upper limits
  79. GRB060319: MASTER limit
  80. GRB 060319: Swift-BAT refined analysis
  81. GRB 060319 optical observations at TNG
  82. GRB060319 : Liverpool Telescope optical limit
  83. GRB060319: Swift/XRT position
  84. GRB 060319: Swift detection of a burst
  85. GRB060313: Radio Observations
  86. GRB 060313: early afterglow NIR upper limits with REM
  87. Konus-Wind observation of GRB 060313
  88. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  89. GRB 060313: PROMPT Observations
  90. GRB 060313: Swift/UVOT Observations
  91. GRB 060313: Swift-XRT team refined analysis
  92. GRB060313: optical observations of the afterglow candidate
  93. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  94. GRB 060313, SMARTS optical counterpart?
  95. GRB 060313: Possible optical counterpart
  96. GRB 060313: Swift XRT position
  97. GRB060313: optical and near infrared observations with REM
  98. GRB 060313: Swift-BAT detection of a bright short hard burst
  99. GRB060312: Swift UVOT observation
  100. GRB 060312: Refined analysis of the Swift-BAT burst

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