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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"

28056 results found.

  1. GRB 060427: Refined analysis of the Swift-BAT burst
  2. GRB060427: Swift XRT Team refined analysis
  3. GRB060418: Swift XRT Team Further Refined Analysis
  4. GRB060425:MASTER survey observations
  5. GRB 060427, optical observation
  6. GRB 060427: Swift detection of a burst
  7. GRB060418: Further Analysis of MIKE Spectroscopy
  8. GRB 060424: Refined analysis of the Swift-BAT burst
  9. GRB 060421: TTT Observations
  10. GRB060421: Swift/UVOT observations
  11. GRB 060421: Swift-BAT Refined Analysis
  12. GRB 060421: Swift-XRT refined analysis
  13. GRB 060418: prediction of t_break
  14. GRB(?) 060421: Swift detection of a burst
  15. Erratum of GCN 4983 for GRB 060418 IR follow-up
  16. GRB 060418 : IR afterglow observations
  17. GRB 060418: Radio Observations
  18. GRB060418, BVRcIc field calibration
  19. GRB060418: Swift/UVOT Observations
  20. GRB060418: Optical Observations
  21. GRB 060418: Refined Analysis of the Swift-BAT burst
  22. GRB 060418, SMARTS continuing afterglow observations
  23. GRB 060418, SMARTS optical/IR afterglow observations
  24. GRB060418 : LT optical afterglow observation
  25. GRB 060418: REM candidate afterglow
  26. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  27. GRB060413: Swift/UVOT upper limits
  28. GRB 060413: REM NIR Observations
  29. GRB 060413: Refined analysis of the Swift-BAT burst
  30. GRB 060403: MITSuME optical observation
  31. GRB060403: Optical Limit
  32. GRB060403: XRT refined analysis
  33. GRB 060403: Swift/UVOT upper limits
  34. SGR 1900+14: BAT observations
  35. GRB 060403: Refined analysis of the Swift-BAT burst
  36. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  37. GRB 060403: Swift detection of a burst
  38. HETE trigger H4044: RTT150 optical observations
  39. GRB060331: Swift/UVOT upper limits
  40. Swift XRT observations of the HETE transient H4043
  41. H4043, an unusual high-energy transient observed by HETE
  42. GRB 060322: LNA optical limit
  43. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  44. INTEGRAL and XMM ToO observations of SGR1900+14
  45. SGR 1900+14: Swift-BAT detection of a bright outburst
  46. GRB 060323 : WIDGET simultaneous optical observations
  47. GRB 060323: Early optical observation at Xinglong
  48. GRB 060322: Confirmation of Swift XRT afterglow
  49. GRB060323: NOT optical observations
  50. GRB 060322: IAC80 optical observations
  51. GRB 060322: Swift XRT afterglow candidate
  52. GRB060323: P60 Observations
  53. GRB 060323: Swift/UVOT Observations
  54. GRB 060323: optical afterglow confirmed
  55. GRB060323: NOT observations
  56. GRB 060323: Optical Observations
  57. GRB 060323: Refined analysis of the Swift-BAT burst
  58. GRB 060323: optical observations at TNG
  59. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  60. GRB 060322: Refined analysis of the Swift-BAT burst
  61. GRB060323, optical observation
  62. GRB060323 - SDSS Pre-Burst Observations
  63. GRB 060323: Swift detection of a burst with a possible optical afterglow
  64. GRB 060322: Swift-BAT detection of a 200-sec burst
  65. GRB 060218/SN 2006aj, LNA optical observation
  66. GRB060218: Refined photometric calibration of comparison stars
  67. GRB 060319: WHT K-band candidate afterglow
  68. GRB060319: Swift/UVOT upper limits
  69. GRB 060319: Swift-BAT refined analysis
  70. GRB 060319 optical observations at TNG
  71. GRB060319 : Liverpool Telescope optical limit
  72. GRB060319 - SDSS Pre-burst Observations
  73. GRB060313: Radio Observations
  74. GRB 060313: early afterglow NIR upper limits with REM
  75. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  76. GRB 060313: Swift/UVOT Observations
  77. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  78. GRB 060313, SMARTS optical counterpart?
  79. GRB 060313, SMARTS optical/IR observations
  80. GRB060313: optical and near infrared observations with REM
  81. GRB060218: SARA Observations of SN2006aj
  82. GRB 060312: Refined analysis of the Swift-BAT burst
  83. GRB 060218/SN 2006aj, high resolution spectra
  84. GRB 060312: Swift XRT team refined analysis
  85. GRB060306: APO Ks-band Imaging Observations
  86. GRB 060312: ROTSE-III Optical Limits
  87. Bright short hard GRB 060303: IPN localization and Konus spectrum
  88. GRB060219: Liverpool Telescope observations
  89. GRB 060306: MAGNUM observations
  90. GRB060218: analysis of the XMM-Newton observation
  91. Swift/UVOT observations of GRB060306
  92. GRB 060306: Swift-BAT refined analysis
  93. GRB 060306: Swift-XRT team refined analysis
  94. GRB 060306: Swift detection of a bright burst
  95. GRB060218: Ep,i - Eiso correlation
  96. GRB060223b: optical limit
  97. GRB 060223b: Swift/UVOT Upper Limits
  98. GRB 060218/SN 2006aj: K-380 optical observations
  99. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  100. GRB 060223B: Swift XRT possible afterglow

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