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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"

32763 results found.

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

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