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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"

45679 results found.

  1. GRB 060403: Swift/UVOT upper limits
  2. HETE Triggers H4043 and H4044 Not Due to New Cosmic Source
  3. SGR 1900+14: BAT observations
  4. GRB 060403: Refined analysis of the Swift-BAT burst
  5. GRB060403: Swift XRT refined position
  6. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  7. GRB 060403: Swift detection of a burst
  8. HETE trigger H4044: RTT150 optical observations
  9. GRB060331: Swift/UVOT upper limits
  10. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  11. Swift XRT observations of the HETE transient H4043
  12. HETE Trigger 4043: ROTSE-III Optical Limits
  13. H4043, an unusual high-energy transient observed by HETE
  14. GRB 060322: LNA optical limit
  15. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  16. INTEGRAL and XMM ToO observations of SGR1900+14
  17. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  18. SGR 1900+14: Swift-BAT detection of a bright outburst
  19. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  20. GRB 060323 : WIDGET simultaneous optical observations
  21. GRB 060323: Early optical observation at Xinglong
  22. GRB060218, optical observations
  23. GRB 060322: Confirmation of Swift XRT afterglow
  24. GRB 060211A: optical observation
  25. GRB060323: optical limit
  26. GRB060211B: optical observation
  27. SGR 1900+14: CORRECTION to GCN 4923
  28. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  29. SGR 1900+14: Swift detection of renewed activity
  30. GRB060323: NOT optical observations
  31. GRB 060322: IAC80 optical observations
  32. GRB 060322: Swift XRT afterglow candidate
  33. GRB060323: P60 Observations
  34. GRB 060323: Swift/UVOT Observations
  35. GRB 060323: optical afterglow confirmed
  36. GRB060323: NOT observations
  37. GRB 060323: Optical Observations
  38. GRB 060323: Tautenburg OT candidate retraction
  39. GRB 060323: Refined analysis of the Swift-BAT burst
  40. GRB 060323: optical observations at TNG
  41. GRB 060323: Swift XRT refined analysis
  42. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  43. GRB 060323: Swift/XRT position
  44. GRB 060322: Refined analysis of the Swift-BAT burst
  45. GRB060323, optical observation
  46. GRB060323 - SDSS Pre-Burst Observations
  47. GRB 060323: Swift detection of a burst with a possible optical afterglow
  48. GRB 060322: Swift-BAT detection of a 200-sec burst
  49. GRB060219: optical observation
  50. GRB060206: optical observation
  51. GRB060218/SN2006aj: optical observations
  52. GRB 060218/SN 2006aj, LNA optical observation
  53. GRB060218: Refined photometric calibration of comparison stars
  54. GRB 060319: WHT K-band candidate afterglow
  55. GRB 060319: IAC-80 optical observations
  56. GRB060319: Swift XRT refined analysis
  57. GRB060319: Swift/UVOT upper limits
  58. GRB 060319: Re-analysis of TNG data
  59. GRB060319: MASTER limit
  60. GRB 060319: Swift-BAT refined analysis
  61. GRB 060319 optical observations at TNG
  62. GRB060319 : Liverpool Telescope optical limit
  63. GRB060319 - SDSS Pre-burst Observations
  64. GRB060319: Swift/XRT position
  65. GRB 060319: Swift detection of a burst
  66. GRB060313: Radio Observations
  67. GRB 060313: early afterglow NIR upper limits with REM
  68. IBAS Alert n. 3221: not a GRB
  69. Konus-Wind observation of GRB 060313
  70. GRB060313: SSO 40inch Observations
  71. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  72. GRB 060313: PROMPT Observations
  73. GRB 060313: Swift/UVOT Observations
  74. GRB060313:Gemini South Observations
  75. GRB 060313: Swift-XRT team refined analysis
  76. GRB060313: optical observations of the afterglow candidate
  77. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  78. GRB 060313, SMARTS optical counterpart?
  79. GRB 060313: Possible optical counterpart
  80. GRB 060313: Swift XRT position
  81. GRB 060313, SMARTS optical/IR observations
  82. GRB060313: optical and near infrared observations with REM
  83. GRB 060313: Swift-BAT detection of a bright short hard burst
  84. GRB060218: SARA Observations of SN2006aj
  85. GRB060312: Swift UVOT observation
  86. GRB 060312: Refined analysis of the Swift-BAT burst
  87. GRB 060218/SN 2006aj, high resolution spectra
  88. GRB 060312: Swift XRT team refined analysis
  89. GRB060306: APO Ks-band Imaging Observations
  90. GRB 060312: ROTSE-III Optical Limits
  91. GRB 060312: Swift detection of a burst
  92. IBAS Alert n. 3218 : not a real GRB
  93. GRB 060306: SOAR Ks Observations
  94. Bright short hard GRB 060303: IPN localization and Konus spectrum
  95. GRB060219: Liverpool Telescope observations
  96. GRB 060306: MAGNUM observations
  97. GRB060218: analysis of the XMM-Newton observation
  98. Swift/UVOT observations of GRB060306
  99. GRB 060306: Swift-BAT refined analysis
  100. GRB 060306: Swift-XRT team refined analysis

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