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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

35346 results found.

  1. GRB 060323: Refined analysis of the Swift-BAT burst
  2. GRB 060323: optical observations at TNG
  3. GRB 060323: Swift XRT refined analysis
  4. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  5. GRB 060323: Swift/XRT position
  6. GRB 060322: Refined analysis of the Swift-BAT burst
  7. GRB060323 - SDSS Pre-Burst Observations
  8. GRB 060323: Swift detection of a burst with a possible optical afterglow
  9. GRB 060322: Swift-BAT detection of a 200-sec burst
  10. GRB060219: optical observation
  11. GRB060206: optical observation
  12. GRB060218/SN2006aj: optical observations
  13. GRB 060218/SN 2006aj, LNA optical observation
  14. GRB060218: Refined photometric calibration of comparison stars
  15. GRB 060319: WHT K-band candidate afterglow
  16. GRB 060319: IAC-80 optical observations
  17. GRB060319: Swift XRT refined analysis
  18. GRB 060319: Re-analysis of TNG data
  19. GRB060319: MASTER limit
  20. GRB 060319: Swift-BAT refined analysis
  21. GRB 060319 optical observations at TNG
  22. GRB060319 : Liverpool Telescope optical limit
  23. GRB060319: MASTER optical observation
  24. GRB060319 - SDSS Pre-burst Observations
  25. GRB 060319: Swift detection of a burst
  26. GRB060313: Radio Observations
  27. GRB 060313: early afterglow NIR upper limits with REM
  28. IBAS Alert n. 3221: not a GRB
  29. Konus-Wind observation of GRB 060313
  30. GRB060313: SSO 40inch Observations
  31. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  32. GRB 060313: PROMPT Observations
  33. GRB 060313: Swift/UVOT Observations
  34. GRB060313:Gemini South Observations
  35. GRB 060313: Swift-XRT team refined analysis
  36. GRB060313: optical observations of the afterglow candidate
  37. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  38. GRB 060313, SMARTS optical counterpart?
  39. GRB 060313: Possible optical counterpart
  40. GRB 060313: Swift XRT position
  41. GRB 060313, SMARTS optical/IR observations
  42. GRB060313: optical and near infrared observations with REM
  43. GRB 060313: Swift-BAT detection of a bright short hard burst
  44. GRB060218: SARA Observations of SN2006aj
  45. GRB 060312: Refined analysis of the Swift-BAT burst
  46. GRB 060218/SN 2006aj, high resolution spectra
  47. GRB 060312: Swift XRT team refined analysis
  48. GRB060306: APO Ks-band Imaging Observations
  49. GRB 060312: ROTSE-III Optical Limits
  50. GRB 060312: Swift detection of a burst
  51. IBAS Alert n. 3218 : not a real GRB
  52. GRB 060306: SOAR Ks Observations
  53. Bright short hard GRB 060303: IPN localization and Konus spectrum
  54. GRB 060306: MAGNUM observations
  55. GRB060218: analysis of the XMM-Newton observation
  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 060306: Swift detection of a bright burst
  61. GRB 060218: RTT150 optical observations
  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: K-380 optical observations
  69. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  70. GRB 060223B: Swift XRT possible afterglow
  71. GRB 060218/SN 2006aj: ABT observations
  72. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  73. GRB 060218 : Radio upper limits from GMRT
  74. GRB 060218/SN 2006aj: WIRO optical observations
  75. GRB 060218/SN 2006aj: RBO optical observations
  76. GRB 060204B: GETS early limit
  77. GRB 060218: Refined analysis of the radio afterglow
  78. GRB 060223A:Xinglong optical limits
  79. GRB 060223B: ART optical limits
  80. GRB 060223B: Swift-BAT refined analysis
  81. GRB 060223a: Swift/UVOT refined analysis
  82. GRB 060223: Swift XRT Team preliminary analysis
  83. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  84. GRB 060223B: Swift detection of a bright burst
  85. GRB 060223: Swift-BAT refined analysis
  86. GRB 060218: rebrightening
  87. GRB 060218/SN 2006aj: optical observations
  88. GRB 060223: Keck redshift
  89. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  90. GRB 060223: Swift detection of a burst
  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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