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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"

45546 results found.

  1. GRB051016: Swift XRT refined analysis.
  2. GRB051016: Planned XMM-Newton observation
  3. GRB 051016: LCO optical and near-IR imaging
  4. GRB 051016: PROMPT Observations
  5. GRB051016: Swift detection of a burst
  6. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  7. GRB051006: optical observations
  8. GRB 051012: Swift-BAT detection of burst yesterday
  9. Swift trigger 159578 is not a burst
  10. Swift-BAT Trigger 159578 is a possible burst
  11. GRB050805A: Rc optical observations
  12. GRB 051006: Swift/UVOT Upper Limits
  13. IBAS Alert 2675 : not a GRB
  14. GRB051008: optical candidate
  15. GRB 051008: - a high redshift high-luminosity burst?
  16. GRB 051008 - a low redshift low-luminosity burst?
  17. IBAS Alert 2673: not a real GRB
  18. GRB051011: bright nebulae near error box
  19. GRB051008: optical observation
  20. GRB051008: Swift XRT refined analysis
  21. GRB051008 - Swift UVOT upper limits
  22. Konus-Wind observation of GRB 051008
  23. GRB051008: Final refined analysis of the Swift-BAT burst
  24. GRB 051008: R-band upper limit
  25. GRB051008: Refined analysis of the Swift-BAT burst
  26. GRB051008: Radio Observation
  27. GRB 051008: Swift XRT position
  28. GRB 051008, optical observations
  29. GRB 051008: early Swift XRT analysis
  30. GRB 051008: Swift UVOT Candidate
  31. GRB051008: Swift-BAT detection of a bright burst
  32. GRB 051006: P60 Observations
  33. grb test
  34. GRB 051006: XRT refined analysis
  35. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  36. GRB 051006: optical observations at Sierra Nevada
  37. GRB051006: Refined analysis of the Swift-BAT burst
  38. GRB 051006: XRT position
  39. GRB051006: Swift detection of a burst
  40. GRB 050906, summary of radio observations
  41. Swift-BAT triggers 158261 and 158262 Retraction
  42. GRB051001: Swift UVOT Upper Limits
  43. GRB 050925: Second Epoch WSRT Radio Observations
  44. GRB 051001: Swift XRT refined analysis
  45. GRB 051001, optical observations at Mt. John
  46. GRB 051001: I-band limit
  47. GRB 051001: AAT infra-red observations
  48. GRB 051001: Swift-BAT refined analysis
  49. GRB 051001: Swift Detection of a Burst
  50. GRB 051001: ROTSE-III Optical Limits
  51. GRB050908: optical observations
  52. GRB050922C: optical observation
  53. GRB050922B: optical limit
  54. GRB 050922C: further VLT observations
  55. GRB 050820A: NIR photometry at the TNG
  56. GRB050922C: UVES/VLT high resolution spectroscopy
  57. GRB050925: Swift/XRT limits
  58. GRB/SGR 050925: IR Observations
  59. GRB050922C - Swift UVOT preliminary analysis
  60. GRB 050922C: break in the lightcurve
  61. GRB 050925: WSRT Radio Observations
  62. GRB050925: Swift UVOT upper limits
  63. Refined analysis of the Swift-BAT soft short burst
  64. GRB 050925 : I-band observation at Xinglong observatory
  65. GRB050925: Faulkes Telescope North R-band limit
  66. GRB050925: Swift-BAT detection of a short burst
  67. GRB 050922B: Correction to BAT refined analysis, longer burst
  68. GRB050922C: TNG spectroscopic observations
  69. GRB050922B: refined XRT analysis
  70. Konus-Wind observation of GRB 050922C
  71. GRB 050922C: Refined redshift
  72. GRB050922B: Swift UVOT early upper limits.
  73. GRB OT observation
  74. GRB050922C: observation at MonteBoo
  75. INT 2.5m limit for GRB050922B
  76. GRB 050922B: optical limit
  77. GRB050922C: Optical Observations
  78. GRB 050922C: Swift XRT refined analysis
  79. HETE Fregate observations of GRB 050922C
  80. GRB 050922C: Swift-BAT refined analysis
  81. GRB 050922B: Swift-BAT refined analysis
  82. GRB050922C: optical observations
  83. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  84. GRB 050922C: optical obserations
  85. GRB 050922C: NOT optical observations
  86. GRB 050922A: Analysis of Swift/XRT TOO observation
  87. GRB 050922C: Swift detection of a bright burst
  88. GRB 050922C: ROTSE-IIId Refined Analysis
  89. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  90. GRB 050922B: ROTSE-III Optical Limits
  91. GRB 050922B,optical observation
  92. GRB050922B: Swift-BAT detection of a weak long burst
  93. Possible GRB 050922 detected by INTEGRAL
  94. GRB050918: Possible Swift/XRT detected afterglow
  95. GRB050820B: analysis of the XMM-Newton observation
  96. GRB050916: Swift/UVOT Upper Limits
  97. GRB 050916: Swift-BAT refined analysis
  98. GRB 050918 - A long GRB detected by INTEGRAL
  99. GRB 050915a: Radio Observations
  100. Swift-BAT trigger 155764 is not a GRB

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