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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28249 results found.

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

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