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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"

41959 results found.

  1. GRB 060323 : WIDGET simultaneous optical observations
  2. GRB 060323: Early optical observation at Xinglong
  3. GRB060218, optical observations
  4. GRB 060322: Confirmation of Swift XRT afterglow
  5. GRB 060211A: optical observation
  6. GRB060323: optical limit
  7. GRB060211B: optical observation
  8. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  9. SGR 1900+14: Swift detection of renewed activity
  10. GRB060323: NOT optical observations
  11. GRB 060322: IAC80 optical observations
  12. GRB 060322: Swift XRT afterglow candidate
  13. GRB060323: P60 Observations
  14. GRB 060323: Swift/UVOT Observations
  15. GRB 060323: optical afterglow confirmed
  16. GRB060323: NOT observations
  17. GRB 060323: Optical Observations
  18. GRB 060323: Tautenburg OT candidate retraction
  19. GRB 060323: optical observations at TNG
  20. GRB 060323: Swift XRT refined analysis
  21. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  22. GRB 060323: Swift/XRT position
  23. GRB 060322: Refined analysis of the Swift-BAT burst
  24. GRB060323, optical observation
  25. GRB060323 - SDSS Pre-Burst Observations
  26. GRB 060323: Swift detection of a burst with a possible optical afterglow
  27. GRB 060322: Swift-BAT detection of a 200-sec burst
  28. GRB060219: optical observation
  29. GRB060206: optical observation
  30. GRB060218/SN2006aj: optical observations
  31. GRB060218: Refined photometric calibration of comparison stars
  32. GRB 060319: WHT K-band candidate afterglow
  33. GRB 060319: IAC-80 optical observations
  34. GRB060319: Swift XRT refined analysis
  35. GRB 060319: Re-analysis of TNG data
  36. GRB 060319 optical observations at TNG
  37. GRB060319 : Liverpool Telescope optical limit
  38. GRB060319 - SDSS Pre-burst Observations
  39. GRB060319: Swift/XRT position
  40. GRB 060319: Swift detection of a burst
  41. GRB060313: Radio Observations
  42. GRB 060313: early afterglow NIR upper limits with REM
  43. Konus-Wind observation of GRB 060313
  44. GRB060313: SSO 40inch Observations
  45. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  46. GRB 060313: PROMPT Observations
  47. GRB 060313: Swift/UVOT Observations
  48. GRB060313:Gemini South Observations
  49. GRB 060313: Swift-XRT team refined analysis
  50. GRB060313: optical observations of the afterglow candidate
  51. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  52. GRB 060313, SMARTS optical counterpart?
  53. GRB 060313: Possible optical counterpart
  54. GRB 060313, SMARTS optical/IR observations
  55. GRB060313: optical and near infrared observations with REM
  56. GRB 060313: Swift-BAT detection of a bright short hard burst
  57. GRB060218: SARA Observations of SN2006aj
  58. GRB060312: Swift UVOT observation
  59. GRB 060312: Refined analysis of the Swift-BAT burst
  60. GRB 060218/SN 2006aj, high resolution spectra
  61. GRB 060312: Swift XRT team refined analysis
  62. GRB060306: APO Ks-band Imaging Observations
  63. GRB 060312: ROTSE-III Optical Limits
  64. GRB 060312: Swift detection of a burst
  65. GRB 060306: SOAR Ks Observations
  66. GRB060219: Liverpool Telescope observations
  67. GRB 060306: MAGNUM observations
  68. GRB060218: analysis of the XMM-Newton observation
  69. Swift/UVOT observations of GRB060306
  70. GRB 060306: Swift-BAT refined analysis
  71. GRB 060306: Swift-XRT team refined analysis
  72. GRB 060306: PROMPT Observations
  73. GRB 060306: Swift detection of a bright burst
  74. GRB 060218: RTT150 optical observations
  75. GRB060218: Ep,i - Eiso correlation
  76. GRB060218: R-band CCD photmetry
  77. GRB060223b: optical limit
  78. GRB060218/SN 2006aj: optical observation in V
  79. GRB060218/SN 2006aj: optical observation
  80. GRB 060121: HST observations
  81. GRB 060218 : GMRT observation [Correction and Improvement]
  82. GRB 060223b: Swift/UVOT Upper Limits
  83. GRB 060218/SN 2006aj: K-380 optical observations
  84. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  85. GRB200618: optical polarimetry and photometry
  86. GRB 060223B: Swift XRT possible afterglow
  87. GRB 060218/SN 2006aj: ABT observations
  88. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  89. GRB 060218 : Radio upper limits from GMRT
  90. GRB 060218/SN 2006aj: WIRO optical observations
  91. GRB 060218/SN 2006aj: RBO optical observations
  92. GRB 060218: Refined analysis of the radio afterglow
  93. GRB 060223A:Xinglong optical limits
  94. GRB 060223B: ART optical limits
  95. GRB 060223B: Swift-BAT refined analysis
  96. GRB 060223: Swift XRT Team preliminary analysis
  97. GRB 060223B: Swift detection of a bright burst
  98. GRB 060218: rebrightening
  99. Correction to GCN 4816 on GRB060218
  100. GRB 060218/SN 2006aj: optical observations

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