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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"

19610 results found.

  1. GRB 060502B: Refined analysis of the Swift-BAT short burst
  2. GRB060502B: Swift XRT Team refined analysis
  3. GRB060502B: correction to XRT position
  4. GRB 060502B: MASTER optical observations
  5. GRB 060502B: Swift detection of a short burst
  6. GRB060502: Swift-XRT refined analysis
  7. GRB 060502: Swift-BAT refined analysis
  8. GRB 060502: APO Spectroscopic Observations
  9. GRB060501: Swift UVOT followup observations
  10. GRB060502: Super-LOTIS Observations
  11. GRB 060502: Swift detection of a burst with an optical counterpart
  12. GRB 060501: MDM Observations
  13. GRB060501: Super-LOTIS observations
  14. GRB060501: P60 imaging and afterglow candidate
  15. GRB 060501: Refined analysis of the Swift-BAT burst
  16. GRB060501: Swift XRT position
  17. GRB 060501: ROTSE-III Optical Limits
  18. GRB 060501: Swift detection of a burst
  19. GRB060428B: optical observation
  20. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  21. GRB 060428B: MDM Observations
  22. GRB060428B: Swift XRT Team refined analysis
  23. GRB 060427B: IPN localization of a short hard burst
  24. GRB 060428B: Refined analysis of the Swift-BAT burst
  25. GRB 060428B: KAIT observations
  26. GRB060428A: Swift/UVOT observations.
  27. GRB060428B, optical observation
  28. GRB 060428A: Refined analysis of the Swift-BAT burst
  29. GRB060428A: Swift XRT Team refined analysis
  30. GRB 060428B: Swift detection of a burst
  31. GRB 060428: Swift detection of a burst
  32. GRB 060427: NOT observations
  33. GRB 060427: Swift/UVOT upper limits.
  34. GRB 060427: Refined analysis of the Swift-BAT burst
  35. GRB060427: Swift XRT Team refined analysis
  36. GRB060418: Swift XRT Team Further Refined Analysis
  37. GRB 060427, optical observation
  38. GRB 060427: Swift detection of a burst
  39. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  40. GRB 060424: Refined analysis of the Swift-BAT burst
  41. GRB 060424: Swift detection of a burst
  42. Swift-BAT detection of Mrk 421
  43. GRB060421: Swift/UVOT observations
  44. GRB 060421: Swift-BAT Refined Analysis
  45. GRB 060421: Swift-XRT refined analysis
  46. GRB 060418: prediction of t_break
  47. Konus-Wind observation of GRB 060418
  48. GRB(?)060421:MASTER optical limit
  49. GRB(?)060421 : XRT position
  50. Possible GRB060421: BART limits
  51. GRB(?) 060421: Swift detection of a burst
  52. GRB060418: Swift/UVOT Observations
  53. GRB 060418: FRAM early afterglow observation
  54. GRB 060418: Refined Analysis of the Swift-BAT burst
  55. VLT/UVES observations of GRB060418
  56. GRB060418: Swift XRT Team Refined Analysis
  57. GRB060418: Magellan/MIKE Spectroscopic Redshift
  58. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  59. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  60. GRB060413: Swift/UVOT upper limits
  61. SGR 1900+14: Swift detection of an outburst
  62. GRB 060413: Refined analysis of the Swift-BAT burst
  63. GRB 060413: XRT refined analysis
  64. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  65. GRB 060413: Swift detection of a burst
  66. GRB060403: XRT refined analysis
  67. GRB 060403: Swift/UVOT upper limits
  68. SGR 1900+14: BAT observations
  69. GRB 060403: Refined analysis of the Swift-BAT burst
  70. GRB060403: Swift XRT refined position
  71. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  72. GRB 060403: Swift detection of a burst
  73. GRB060331: Swift/UVOT upper limits
  74. Swift XRT observations of the HETE transient H4043
  75. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  76. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  77. SGR 1900+14: Swift-BAT detection of a bright outburst
  78. GRB 060323 : WIDGET simultaneous optical observations
  79. GRB 060322: Confirmation of Swift XRT afterglow
  80. GRB060323: optical limit
  81. SGR 1900+14: CORRECTION to GCN 4923
  82. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  83. SGR 1900+14: Swift detection of renewed activity
  84. GRB060323: NOT optical observations
  85. GRB 060322: IAC80 optical observations
  86. GRB 060322: Swift XRT afterglow candidate
  87. GRB 060323: Swift/UVOT Observations
  88. GRB060323: NOT observations
  89. GRB 060323: Refined analysis of the Swift-BAT burst
  90. GRB 060323: Swift XRT refined analysis
  91. GRB 060323: Swift/XRT position
  92. GRB 060322: Refined analysis of the Swift-BAT burst
  93. GRB060323 - SDSS Pre-Burst Observations
  94. GRB 060323: Swift detection of a burst with a possible optical afterglow
  95. GRB 060322: Swift-BAT detection of a 200-sec burst
  96. GRB 060319: IAC-80 optical observations
  97. GRB060319: Swift XRT refined analysis
  98. GRB060319: Swift/UVOT upper limits
  99. GRB 060319: Swift-BAT refined analysis
  100. GRB060319: Swift/XRT position

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