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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"

19608 results found.

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

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