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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"

39321 results found.

  1. GRB 060428b: Optical afterglow candidate
  2. GRB 060428B: Swift detection of a burst
  3. GRB 060427: NIR observations
  4. GRB 060428: Swift detection of a burst
  5. GRB 060427: NOT observations
  6. GRB 060427: Swift/UVOT upper limits.
  7. GRB 060427: Refined analysis of the Swift-BAT burst
  8. GRB060418: Swift XRT Team Further Refined Analysis
  9. GRB060425:MASTER survey observations
  10. GRB 060427, optical observation
  11. GRB 060427: Swift detection of a burst
  12. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  13. An interactive program for GRB pseudo-redshift computations
  14. GRB060424: optical afterglow detection
  15. GRB060418: Further Analysis of MIKE Spectroscopy
  16. GRB 060424: Refined analysis of the Swift-BAT burst
  17. GRB 060424: Swift detection of a burst
  18. GRB 060421: TTT Observations
  19. No OT 060420 in MASCOT images
  20. Swift-BAT detection of Mrk 421
  21. GRB 060421: Swift-BAT Refined Analysis
  22. GRB 060421: Swift-XRT refined analysis
  23. GRB 060418: prediction of t_break
  24. GRB060418: optical observations
  25. Konus-Wind observation of GRB 060418
  26. GRB(?)060421:MASTER optical limit
  27. GRB(?)060421 : XRT position
  28. Possible GRB060421: BART limits
  29. GRB(?) 060421: Swift detection of a burst
  30. Erratum of GCN 4983 for GRB 060418 IR follow-up
  31. GRB 060418 : IR afterglow observations
  32. GRB 060418 : Lulin Optical follow-up
  33. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  34. GRB 060418: Radio Observations
  35. GRB060418, BVRcIc field calibration
  36. GRB060418: Optical Observations
  37. GRB 060418: FRAM early afterglow observation
  38. GRB 060418: Refined Analysis of the Swift-BAT burst
  39. GRB060418: Swift XRT Team Refined Analysis
  40. GRB 060418, SMARTS continuing afterglow observations
  41. GRB 060418: PROMPT Detections
  42. GRB 060418, SMARTS optical/IR afterglow observations
  43. GRB060418: Magellan/MIKE Spectroscopic Redshift
  44. GRB060418 : LT optical afterglow observation
  45. GRB 060418: REM candidate afterglow
  46. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  47. GRB 060413: REM NIR Observations
  48. SGR 1900+14: Swift detection of an outburst
  49. GRB 060413: Refined analysis of the Swift-BAT burst
  50. GRB 060413: Watcher UBVR observations
  51. GRB 060413: XRT refined analysis
  52. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  53. GRB 060413: Swift detection of a burst
  54. GRB060403: optical observations
  55. GRB 060403 Optical observations
  56. GRB 060403: MITSuME optical observation
  57. GRB060403: XRT refined analysis
  58. GRB 060403: Swift/UVOT upper limits
  59. GRB 060403: Refined analysis of the Swift-BAT burst
  60. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  61. GRB 060403: Swift detection of a burst
  62. HETE Trigger 4043: ROTSE-III Optical Limits
  63. GRB 060322: LNA optical limit
  64. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  65. SGR 1900+14: Swift-BAT detection of a bright outburst
  66. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  67. GRB 060323 : WIDGET simultaneous optical observations
  68. GRB 060323: Early optical observation at Xinglong
  69. GRB060218, optical observations
  70. GRB 060322: Confirmation of Swift XRT afterglow
  71. GRB 060211A: optical observation
  72. GRB060323: optical limit
  73. GRB060211B: optical observation
  74. SGR 1900+14: Swift detection of renewed activity
  75. GRB060323: NOT optical observations
  76. GRB 060322: IAC80 optical observations
  77. GRB 060322: Swift XRT afterglow candidate
  78. GRB 060323: Swift/UVOT Observations
  79. GRB 060323: optical afterglow confirmed
  80. GRB060323: NOT observations
  81. GRB 060323: Optical Observations
  82. GRB 060323: Tautenburg OT candidate retraction
  83. GRB 060323: Refined analysis of the Swift-BAT burst
  84. GRB 060323: optical observations at TNG
  85. GRB 060323: Swift XRT refined analysis
  86. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  87. GRB 060323: Swift/XRT position
  88. GRB 060322: Refined analysis of the Swift-BAT burst
  89. GRB060323 - SDSS Pre-Burst Observations
  90. GRB 060323: Swift detection of a burst with a possible optical afterglow
  91. GRB 060322: Swift-BAT detection of a 200-sec burst
  92. GRB060219: optical observation
  93. GRB060206: optical observation
  94. GRB060218/SN2006aj: optical observations
  95. GRB 060218/SN 2006aj, LNA optical observation
  96. GRB060218: Refined photometric calibration of comparison stars
  97. GRB 060319: WHT K-band candidate afterglow
  98. GRB 060319: IAC-80 optical observations
  99. GRB060319: Swift XRT refined analysis
  100. GRB 060319: Re-analysis of TNG data

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