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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"

28052 results found.

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

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