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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"

28228 results found.

  1. GRB051103: MASTER: OT limit and host galaxy candidates
  2. GRB051028: Swift-XRT refined analysis
  3. GRB 051105a, observation from Naini Tal and OSN
  4. GRB 051105a: MDM Observations
  5. GRB 051105A: TNG optical observations
  6. GRB051105A: Swift/UVOT Observations
  7. GRB 051105A, radio observations
  8. GRB051103:_MASTER_optical_observations
  9. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  10. GRB 051105A, optical observations
  11. XRT observations of GRB 051105A
  12. GRB 051105b: ART optical limits
  13. GRB 051105B (INTEGRAL 2701): Optical observation
  14. GRB 051105: Swift detection of a short burst
  15. Recent GRB UBVRcIc field photometry
  16. GRB051028 SARA Observation
  17. GRB051028: optical observations
  18. GRB051028: Swift/UVOT upper limits
  19. GRB051028: Swift XRT Position
  20. GRB051028:MASTER observations
  21. GRB051021B: Swift/UVOT Upper limits
  22. GRB 051021, Optical Observations
  23. GRB 051022: XRT Refined Spectral and Temporal Analysis
  24. GRB051012: Swift-XRT analysis
  25. GRB051021B: Swift XRT refined analysis
  26. GRB 051022, mm counterpart
  27. GRB 051022: Swift/UVOT Upper Limits
  28. GRB051022: Radio Counterpart
  29. GRB051022: IR observations
  30. GRB051021A: Swift XRT refined analysis
  31. GRB051022: Optical Observations
  32. GRB051021b: Magellan IR Imaging
  33. GRB 051021, SMARTS optical/IR observations
  34. GRB051022: Swift XRT Position
  35. GRB 051021: P200 Ks Observations
  36. GRB 051022 (=H3950): SXC Flight Localization is Valid
  37. GRB051021: Swift/UVOT Upper Limits
  38. GRB 051021B: Refined analysis of the Swift-BAT burst
  39. GRB 051022: SSO40 Optical Observations
  40. GRB051022,optical observation
  41. GRB 051021,optical observation
  42. GRB 051021B: Swift detection of a burst
  43. GRB 051021 : optical afterglow observation at Lulin
  44. GRB 051021: Optical observations and candidate afterglow
  45. GRB051021.63
  46. GRB051021.6: MASTER optical observation
  47. GRB051021: A GRB Localized by HETE
  48. Swift-BAT triggered on a posible CR Shower or possible GRB
  49. GRB 051016b: Optical limit
  50. Afterglow candidate of GRB 051016B observed at Lulin
  51. GRB 051016A: Swift/UVOT upper limits
  52. GRB 051016B: refined analysis of the Swift/XRT data
  53. GRB 051016B: Swift/UVOT detection
  54. GRB 051016B,optical observation
  55. GRB 051016B : Optical follow-up at Lulin
  56. GRB 051016B: Refined analysis of the Swift-BAT burst
  57. GRB 051016B: Swift detection of a soft burst
  58. GRB 051016: Swift-BAT refined analysis
  59. GRB051016 XMM-Newton observation
  60. GRB051016: Swift XRT refined analysis.
  61. GRB 051016: PROMPT Observations
  62. GRB051016: Swift detection of a burst
  63. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  64. GRB 051012: Swift-BAT detection of burst yesterday
  65. Swift-BAT Trigger 159578 is a possible burst
  66. GRB 051006: Swift/UVOT Upper Limits
  67. GRB051008: optical candidate
  68. GRB 051008 - a low redshift low-luminosity burst?
  69. GRB051011: bright nebulae near error box
  70. GRB051011: MASTER optical observation
  71. GRB051008: Final refined analysis of the Swift-BAT burst
  72. GRB051008: Radio Observation
  73. GRB 051008, optical observations
  74. GRB 051008: early Swift XRT analysis
  75. GRB 051008: Swift UVOT Candidate
  76. GRB 051006: P60 Observations
  77. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  78. GRB 051006: optical observations at Sierra Nevada
  79. GRB051006: Refined analysis of the Swift-BAT burst
  80. GRB051006: Swift detection of a burst
  81. GRB 050906, summary of radio observations
  82. GRB051001: Swift UVOT Upper Limits
  83. GRB 050925: Second Epoch WSRT Radio Observations
  84. GRB 051001: I-band limit
  85. GRB 051001: AAT infra-red observations
  86. GRB 051001: Swift-BAT refined analysis
  87. GRB 051001: Swift Detection of a Burst
  88. GRB 050820A: NIR photometry at the TNG
  89. GRB050925: Swift/XRT limits
  90. GRB/SGR 050925: IR Observations
  91. GRB 050922C: break in the lightcurve
  92. GRB050925: Swift UVOT upper limits
  93. Refined analysis of the Swift-BAT soft short burst
  94. GRB050925: Faulkes Telescope North R-band limit
  95. GRB050925: Swift-BAT detection of a short burst
  96. GRB050922C: TNG spectroscopic observations
  97. GRB050922B: refined XRT analysis
  98. GRB050922B: Swift UVOT early upper limits.
  99. GRB050922C: Optical Observations
  100. GRB 050922C: Swift XRT refined analysis

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