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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"

28051 results found.

  1. GRB 060427: Swift detection of a burst
  2. GRB060418: Further Analysis of MIKE Spectroscopy
  3. GRB 060424: Refined analysis of the Swift-BAT burst
  4. GRB 060421: TTT Observations
  5. GRB060421: Swift/UVOT observations
  6. GRB 060421: Swift-BAT Refined Analysis
  7. GRB 060421: Swift-XRT refined analysis
  8. GRB 060418: prediction of t_break
  9. GRB(?) 060421: Swift detection of a burst
  10. Erratum of GCN 4983 for GRB 060418 IR follow-up
  11. GRB 060418 : IR afterglow observations
  12. GRB 060418: Radio Observations
  13. GRB060418, BVRcIc field calibration
  14. GRB060418: Swift/UVOT Observations
  15. GRB060418: Optical Observations
  16. GRB 060418: Refined Analysis of the Swift-BAT burst
  17. GRB 060418, SMARTS continuing afterglow observations
  18. GRB 060418, SMARTS optical/IR afterglow observations
  19. GRB060418 : LT optical afterglow observation
  20. GRB 060418: REM candidate afterglow
  21. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  22. GRB060413: Swift/UVOT upper limits
  23. GRB 060413: REM NIR Observations
  24. GRB 060413: Refined analysis of the Swift-BAT burst
  25. GRB 060403: MITSuME optical observation
  26. GRB060403: Optical Limit
  27. GRB060403: XRT refined analysis
  28. GRB 060403: Swift/UVOT upper limits
  29. SGR 1900+14: BAT observations
  30. GRB 060403: Refined analysis of the Swift-BAT burst
  31. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  32. GRB 060403: Swift detection of a burst
  33. HETE trigger H4044: RTT150 optical observations
  34. GRB060331: Swift/UVOT upper limits
  35. Swift XRT observations of the HETE transient H4043
  36. H4043, an unusual high-energy transient observed by HETE
  37. GRB 060322: LNA optical limit
  38. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  39. INTEGRAL and XMM ToO observations of SGR1900+14
  40. SGR 1900+14: Swift-BAT detection of a bright outburst
  41. GRB 060323 : WIDGET simultaneous optical observations
  42. GRB 060323: Early optical observation at Xinglong
  43. GRB 060322: Confirmation of Swift XRT afterglow
  44. GRB060323: NOT optical observations
  45. GRB 060322: IAC80 optical observations
  46. GRB 060322: Swift XRT afterglow candidate
  47. GRB060323: P60 Observations
  48. GRB 060323: Swift/UVOT Observations
  49. GRB 060323: optical afterglow confirmed
  50. GRB060323: NOT observations
  51. GRB 060323: Optical Observations
  52. GRB 060323: Refined analysis of the Swift-BAT burst
  53. GRB 060323: optical observations at TNG
  54. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  55. GRB 060322: Refined analysis of the Swift-BAT burst
  56. GRB060323, optical observation
  57. GRB060323 - SDSS Pre-Burst Observations
  58. GRB 060323: Swift detection of a burst with a possible optical afterglow
  59. GRB 060322: Swift-BAT detection of a 200-sec burst
  60. GRB 060218/SN 2006aj, LNA optical observation
  61. GRB060218: Refined photometric calibration of comparison stars
  62. GRB 060319: WHT K-band candidate afterglow
  63. GRB060319: Swift/UVOT upper limits
  64. GRB 060319: Swift-BAT refined analysis
  65. GRB 060319 optical observations at TNG
  66. GRB060319 : Liverpool Telescope optical limit
  67. GRB060319 - SDSS Pre-burst Observations
  68. GRB060313: Radio Observations
  69. GRB 060313: early afterglow NIR upper limits with REM
  70. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  71. GRB 060313: Swift/UVOT Observations
  72. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  73. GRB 060313, SMARTS optical counterpart?
  74. GRB 060313, SMARTS optical/IR observations
  75. GRB060313: optical and near infrared observations with REM
  76. GRB060218: SARA Observations of SN2006aj
  77. GRB 060312: Refined analysis of the Swift-BAT burst
  78. GRB 060218/SN 2006aj, high resolution spectra
  79. GRB 060312: Swift XRT team refined analysis
  80. GRB060306: APO Ks-band Imaging Observations
  81. GRB 060312: ROTSE-III Optical Limits
  82. Bright short hard GRB 060303: IPN localization and Konus spectrum
  83. GRB060219: Liverpool Telescope observations
  84. GRB 060306: MAGNUM observations
  85. GRB060218: analysis of the XMM-Newton observation
  86. Swift/UVOT observations of GRB060306
  87. GRB 060306: Swift-BAT refined analysis
  88. GRB 060306: Swift-XRT team refined analysis
  89. GRB 060306: Swift detection of a bright burst
  90. GRB060218: Ep,i - Eiso correlation
  91. GRB060223b: optical limit
  92. GRB 060223b: Swift/UVOT Upper Limits
  93. GRB 060218/SN 2006aj: K-380 optical observations
  94. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  95. GRB 060223B: Swift XRT possible afterglow
  96. GRB 060218/SN 2006aj: ABT observations
  97. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  98. GRB 060218 : Radio upper limits from GMRT
  99. GRB 060218/SN 2006aj: RBO optical observations
  100. GRB 060204B: GETS early limit

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