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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"

26361 results found.

  1. GRB 060428B: Swift detection of a burst
  2. GRB 060427: NIR observations
  3. GRB060427: Xinglong optical Observations
  4. GRB 060428: Swift detection of a burst
  5. GRB 060427: Swift/UVOT upper limits.
  6. GRB 060427: Refined analysis of the Swift-BAT burst
  7. GRB060427: Swift XRT Team refined analysis
  8. GRB060418: Swift XRT Team Further Refined Analysis
  9. GRB060425:MASTER survey observations
  10. GRB 060427, optical observation
  11. GRB 060427: Swift detection of a burst
  12. GRB060418: Further Analysis of MIKE Spectroscopy
  13. GRB 060424: Refined analysis of the Swift-BAT burst
  14. GRB 060421: TTT Observations
  15. GRB060421: Swift/UVOT observations
  16. GRB 060421: Swift-BAT Refined Analysis
  17. GRB 060421: Swift-XRT refined analysis
  18. GRB 060418: prediction of t_break
  19. GRB(?) 060421: Swift detection of a burst
  20. Erratum of GCN 4983 for GRB 060418 IR follow-up
  21. GRB 060418 : IR afterglow observations
  22. GRB 060418: Radio Observations
  23. GRB060418, BVRcIc field calibration
  24. GRB060418: Swift/UVOT Observations
  25. GRB060418: Optical Observations
  26. GRB 060418: Refined Analysis of the Swift-BAT burst
  27. GRB 060418, SMARTS continuing afterglow observations
  28. GRB 060418, SMARTS optical/IR afterglow observations
  29. GRB060418 : LT optical afterglow observation
  30. GRB 060418: REM candidate afterglow
  31. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  32. GRB060413: Swift/UVOT upper limits
  33. GRB 060413: REM NIR Observations
  34. GRB 060413: Refined analysis of the Swift-BAT burst
  35. GRB 060403: MITSuME optical observation
  36. GRB060403: Optical Limit
  37. GRB060403: XRT refined analysis
  38. GRB 060403: Swift/UVOT upper limits
  39. SGR 1900+14: BAT observations
  40. GRB 060403: Refined analysis of the Swift-BAT burst
  41. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  42. GRB 060403: Swift detection of a burst
  43. HETE trigger H4044: RTT150 optical observations
  44. GRB060331: Swift/UVOT upper limits
  45. Swift XRT observations of the HETE transient H4043
  46. H4043, an unusual high-energy transient observed by HETE
  47. GRB 060322: LNA optical limit
  48. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  49. INTEGRAL and XMM ToO observations of SGR1900+14
  50. SGR 1900+14: Swift-BAT detection of a bright outburst
  51. GRB 060323 : WIDGET simultaneous optical observations
  52. GRB 060323: Early optical observation at Xinglong
  53. GRB 060322: Confirmation of Swift XRT afterglow
  54. GRB060323: NOT optical observations
  55. GRB 060322: IAC80 optical observations
  56. GRB 060322: Swift XRT afterglow candidate
  57. GRB060323: P60 Observations
  58. GRB 060323: Swift/UVOT Observations
  59. GRB 060323: optical afterglow confirmed
  60. GRB060323: NOT observations
  61. GRB 060323: Optical Observations
  62. GRB 060323: Refined analysis of the Swift-BAT burst
  63. GRB 060323: optical observations at TNG
  64. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  65. GRB 060322: Refined analysis of the Swift-BAT burst
  66. GRB060323, optical observation
  67. GRB060323 - SDSS Pre-Burst Observations
  68. GRB 060323: Swift detection of a burst with a possible optical afterglow
  69. GRB 060322: Swift-BAT detection of a 200-sec burst
  70. GRB 060218/SN 2006aj, LNA optical observation
  71. GRB060218: Refined photometric calibration of comparison stars
  72. GRB 060319: WHT K-band candidate afterglow
  73. GRB060319: Swift/UVOT upper limits
  74. GRB 060319: Swift-BAT refined analysis
  75. GRB 060319 optical observations at TNG
  76. GRB060319 : Liverpool Telescope optical limit
  77. GRB060319 - SDSS Pre-burst Observations
  78. GRB060313: Radio Observations
  79. GRB 060313: early afterglow NIR upper limits with REM
  80. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  81. GRB 060313: Swift/UVOT Observations
  82. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  83. GRB 060313, SMARTS optical counterpart?
  84. GRB 060313, SMARTS optical/IR observations
  85. GRB060313: optical and near infrared observations with REM
  86. GRB060218: SARA Observations of SN2006aj
  87. GRB 060312: Refined analysis of the Swift-BAT burst
  88. GRB 060218/SN 2006aj, high resolution spectra
  89. GRB 060312: Swift XRT team refined analysis
  90. GRB060306: APO Ks-band Imaging Observations
  91. GRB 060312: ROTSE-III Optical Limits
  92. Bright short hard GRB 060303: IPN localization and Konus spectrum
  93. GRB060219: Liverpool Telescope observations
  94. GRB 060306: MAGNUM observations
  95. GRB060218: analysis of the XMM-Newton observation
  96. Swift/UVOT observations of GRB060306
  97. GRB 060306: Swift-BAT refined analysis
  98. GRB 060306: Swift-XRT team refined analysis
  99. GRB 060306: Swift detection of a bright burst
  100. GRB060218: Ep,i - Eiso correlation

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