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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"

45593 results found.

  1. GRB060413: Swift/UVOT upper limits
  2. GRB 060413: REM NIR Observations
  3. SGR 1900+14: Swift detection of an outburst
  4. GRB 060413: Refined analysis of the Swift-BAT burst
  5. GRB 060413: Watcher UBVR observations
  6. GRB 060413: XRT refined analysis
  7. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  8. GRB 060413: Swift detection of a burst
  9. GRB060403: optical observations
  10. GRB 060403 Optical observations
  11. GRB 060403: MITSuME optical observation
  12. GRB060403: Optical Limit
  13. GRB060403: XRT refined analysis
  14. GRB 060403: Swift/UVOT upper limits
  15. HETE Triggers H4043 and H4044 Not Due to New Cosmic Source
  16. SGR 1900+14: BAT observations
  17. GRB 060403: Refined analysis of the Swift-BAT burst
  18. GRB060403: Swift XRT refined position
  19. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  20. GRB 060403: Swift detection of a burst
  21. HETE trigger H4044: RTT150 optical observations
  22. GRB060331: Swift/UVOT upper limits
  23. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  24. Swift XRT observations of the HETE transient H4043
  25. HETE Trigger 4043: ROTSE-III Optical Limits
  26. H4043, an unusual high-energy transient observed by HETE
  27. GRB 060322: LNA optical limit
  28. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  29. INTEGRAL and XMM ToO observations of SGR1900+14
  30. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  31. SGR 1900+14: Swift-BAT detection of a bright outburst
  32. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  33. GRB 060323 : WIDGET simultaneous optical observations
  34. GRB 060323: Early optical observation at Xinglong
  35. GRB060218, optical observations
  36. GRB 060322: Confirmation of Swift XRT afterglow
  37. GRB 060211A: optical observation
  38. GRB060323: optical limit
  39. GRB060211B: optical observation
  40. SGR 1900+14: CORRECTION to GCN 4923
  41. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  42. SGR 1900+14: Swift detection of renewed activity
  43. GRB060323: NOT optical observations
  44. GRB 060322: IAC80 optical observations
  45. GRB 060322: Swift XRT afterglow candidate
  46. GRB060323: P60 Observations
  47. GRB 060323: Swift/UVOT Observations
  48. GRB 060323: optical afterglow confirmed
  49. GRB060323: NOT observations
  50. GRB 060323: Optical Observations
  51. GRB 060323: Tautenburg OT candidate retraction
  52. GRB 060323: Refined analysis of the Swift-BAT burst
  53. GRB 060323: optical observations at TNG
  54. GRB 060323: Swift XRT refined analysis
  55. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  56. GRB 060323: Swift/XRT position
  57. GRB 060322: Refined analysis of the Swift-BAT burst
  58. GRB060323, optical observation
  59. GRB060323 - SDSS Pre-Burst Observations
  60. GRB 060323: Swift detection of a burst with a possible optical afterglow
  61. GRB 060322: Swift-BAT detection of a 200-sec burst
  62. GRB060219: optical observation
  63. GRB060206: optical observation
  64. GRB060218/SN2006aj: optical observations
  65. GRB 060218/SN 2006aj, LNA optical observation
  66. GRB060218: Refined photometric calibration of comparison stars
  67. GRB 060319: WHT K-band candidate afterglow
  68. GRB 060319: IAC-80 optical observations
  69. GRB060319: Swift XRT refined analysis
  70. GRB060319: Swift/UVOT upper limits
  71. GRB 060319: Re-analysis of TNG data
  72. GRB060319: MASTER limit
  73. GRB 060319: Swift-BAT refined analysis
  74. GRB 060319 optical observations at TNG
  75. GRB060319 : Liverpool Telescope optical limit
  76. GRB060319 - SDSS Pre-burst Observations
  77. GRB060319: Swift/XRT position
  78. GRB 060319: Swift detection of a burst
  79. GRB060313: Radio Observations
  80. GRB 060313: early afterglow NIR upper limits with REM
  81. IBAS Alert n. 3221: not a GRB
  82. Konus-Wind observation of GRB 060313
  83. GRB060313: SSO 40inch Observations
  84. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  85. GRB 060313: PROMPT Observations
  86. GRB 060313: Swift/UVOT Observations
  87. GRB060313:Gemini South Observations
  88. GRB 060313: Swift-XRT team refined analysis
  89. GRB060313: optical observations of the afterglow candidate
  90. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  91. GRB 060313, SMARTS optical counterpart?
  92. GRB 060313: Possible optical counterpart
  93. GRB 060313: Swift XRT position
  94. GRB 060313, SMARTS optical/IR observations
  95. GRB060313: optical and near infrared observations with REM
  96. GRB 060313: Swift-BAT detection of a bright short hard burst
  97. GRB060218: SARA Observations of SN2006aj
  98. GRB060312: Swift UVOT observation
  99. GRB 060312: Refined analysis of the Swift-BAT burst
  100. GRB 060218/SN 2006aj, high resolution spectra

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