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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"

32766 results found.

  1. GRB 060322: Confirmation of Swift XRT afterglow
  2. GRB 060211A: optical observation
  3. GRB060323: optical limit
  4. GRB060211B: optical observation
  5. SGR 1900+14: CORRECTION to GCN 4923
  6. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  7. GRB060323: NOT optical observations
  8. GRB 060322: Swift XRT afterglow candidate
  9. GRB060323: P60 Observations
  10. GRB 060323: Swift/UVOT Observations
  11. GRB 060323: optical afterglow confirmed
  12. GRB060323: NOT observations
  13. GRB 060323: Optical Observations
  14. GRB 060323: Tautenburg OT candidate retraction
  15. GRB 060323: Refined analysis of the Swift-BAT burst
  16. GRB 060323: optical observations at TNG
  17. GRB 060323: Swift XRT refined analysis
  18. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  19. GRB 060323: Swift/XRT position
  20. GRB 060322: Refined analysis of the Swift-BAT burst
  21. GRB060323, optical observation
  22. GRB060206: optical observation
  23. GRB060218/SN2006aj: optical observations
  24. GRB 060218/SN 2006aj, LNA optical observation
  25. GRB060218: Refined photometric calibration of comparison stars
  26. GRB 060319: WHT K-band candidate afterglow
  27. GRB060319: Swift XRT refined analysis
  28. GRB060319: Swift/UVOT upper limits
  29. GRB 060319: Re-analysis of TNG data
  30. GRB060319: MASTER limit
  31. GRB 060319: Swift-BAT refined analysis
  32. GRB 060319 optical observations at TNG
  33. GRB060319 : Liverpool Telescope optical limit
  34. GRB060319 - SDSS Pre-burst Observations
  35. GRB060319: Swift/XRT position
  36. GRB060313: Radio Observations
  37. GRB 060313: early afterglow NIR upper limits with REM
  38. Konus-Wind observation of GRB 060313
  39. GRB060313: SSO 40inch Observations
  40. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  41. GRB 060313: PROMPT Observations
  42. GRB 060313: Swift/UVOT Observations
  43. GRB060313:Gemini South Observations
  44. GRB 060313: Swift-XRT team refined analysis
  45. GRB060313: optical observations of the afterglow candidate
  46. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  47. GRB 060313, SMARTS optical counterpart?
  48. GRB 060313: Possible optical counterpart
  49. GRB 060313: Swift XRT position
  50. GRB 060313, SMARTS optical/IR observations
  51. GRB060313: optical and near infrared observations with REM
  52. GRB060218: SARA Observations of SN2006aj
  53. GRB 060312: Refined analysis of the Swift-BAT burst
  54. GRB 060312: Swift XRT team refined analysis
  55. GRB060306: APO Ks-band Imaging Observations
  56. GRB 060312: ROTSE-III Optical Limits
  57. GRB 060306: SOAR Ks Observations
  58. GRB 060306: MAGNUM observations
  59. Swift/UVOT observations of GRB060306
  60. GRB 060306: Swift-BAT refined analysis
  61. GRB 060306: Swift-XRT team refined analysis
  62. GRB 060306: PROMPT Observations
  63. GRB 060218: RTT150 optical observations
  64. GRB060218: Ep,i - Eiso correlation
  65. GRB060223b: optical limit
  66. GRB060218/SN 2006aj: optical observation in V
  67. GRB060218/SN 2006aj: optical observation
  68. GRB 060121: HST observations
  69. GRB 060218 : GMRT observation [Correction and Improvement]
  70. GRB 060223b: Swift/UVOT Upper Limits
  71. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  72. GRB 060223B: Swift XRT possible afterglow
  73. GRB 060218/SN 2006aj: ABT observations
  74. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  75. GRB 060218 : Radio upper limits from GMRT
  76. GRB 060218/SN 2006aj: WIRO optical observations
  77. GRB 060218/SN 2006aj: RBO optical observations
  78. GRB 060204B: GETS early limit
  79. GRB 060218: Refined analysis of the radio afterglow
  80. GRB 060223B: ART optical limits
  81. GRB 060223B: Swift-BAT refined analysis
  82. GRB 060223a: Swift/UVOT refined analysis
  83. GRB 060223: Swift XRT Team preliminary analysis
  84. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  85. GRB 060223B: Swift detection of a bright burst
  86. GRB 060223: Swift-BAT refined analysis
  87. Correction to GCN 4816 on GRB060218
  88. GRB 060218/SN 2006aj: optical observations
  89. GRB060218: Optical brightening in V and R
  90. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  91. Spectral properties of GRB060218/SN2006aj
  92. GRB 060219: Swift-BAT refined analysis
  93. GRB 060218: rebrightening
  94. GRB 060218: emergence of the underlying SN spectrum
  95. GRB 060218: Decline in r-band flux
  96. GRB 060218: spectroscopic observations
  97. GRB 060218: Further refined analysis of the Swift-BAT burst
  98. GRB 060218: Likely an underluminous GRB
  99. GRB060218: Optical Spectroscopy of GRB-SN
  100. GRB060218: VLT spectroscopy

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