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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"

28231 results found.

  1. GRB 051109a: IR Detections
  2. GRB051105B: Swift/XRT upper limit
  3. GRB051105B: Swift/UVOT upper limit
  4. GRB051103: MASTER: OT limit and host galaxy candidates
  5. GRB051028: Swift-XRT refined analysis
  6. GRB 051105a, observation from Naini Tal and OSN
  7. GRB 051105a: MDM Observations
  8. GRB 051105A: TNG optical observations
  9. GRB051105A: Swift/UVOT Observations
  10. GRB 051105A, radio observations
  11. GRB051103:_MASTER_optical_observations
  12. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  13. GRB 051105A, optical observations
  14. XRT observations of GRB 051105A
  15. GRB 051105b: ART optical limits
  16. GRB 051105B (INTEGRAL 2701): Optical observation
  17. GRB 051105: Swift detection of a short burst
  18. Recent GRB UBVRcIc field photometry
  19. GRB051028 SARA Observation
  20. GRB051028: optical observations
  21. GRB051028: Swift/UVOT upper limits
  22. GRB051028: Swift XRT Position
  23. GRB051028:MASTER observations
  24. GRB051021B: Swift/UVOT Upper limits
  25. GRB 051021, Optical Observations
  26. GRB 051022: XRT Refined Spectral and Temporal Analysis
  27. GRB051012: Swift-XRT analysis
  28. GRB051021B: Swift XRT refined analysis
  29. GRB 051022, mm counterpart
  30. GRB 051022: Swift/UVOT Upper Limits
  31. GRB051022: Radio Counterpart
  32. GRB051022: IR observations
  33. GRB051021A: Swift XRT refined analysis
  34. GRB051022: Optical Observations
  35. GRB051021b: Magellan IR Imaging
  36. GRB 051021, SMARTS optical/IR observations
  37. GRB051022: Swift XRT Position
  38. GRB 051021: P200 Ks Observations
  39. GRB 051022 (=H3950): SXC Flight Localization is Valid
  40. GRB051021: Swift/UVOT Upper Limits
  41. GRB 051021B: Refined analysis of the Swift-BAT burst
  42. GRB 051022: SSO40 Optical Observations
  43. GRB051022,optical observation
  44. GRB 051021,optical observation
  45. GRB 051021B: Swift detection of a burst
  46. GRB 051021 : optical afterglow observation at Lulin
  47. GRB 051021: Optical observations and candidate afterglow
  48. GRB051021.63
  49. GRB051021.6: MASTER optical observation
  50. GRB051021: A GRB Localized by HETE
  51. Swift-BAT triggered on a posible CR Shower or possible GRB
  52. GRB 051016b: Optical limit
  53. Afterglow candidate of GRB 051016B observed at Lulin
  54. GRB 051016A: Swift/UVOT upper limits
  55. GRB 051016B: refined analysis of the Swift/XRT data
  56. GRB 051016B: Swift/UVOT detection
  57. GRB 051016B,optical observation
  58. GRB 051016B : Optical follow-up at Lulin
  59. GRB 051016B: Refined analysis of the Swift-BAT burst
  60. GRB 051016B: Swift detection of a soft burst
  61. GRB 051016: Swift-BAT refined analysis
  62. GRB051016 XMM-Newton observation
  63. GRB051016: Swift XRT refined analysis.
  64. GRB 051016: PROMPT Observations
  65. GRB051016: Swift detection of a burst
  66. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  67. GRB 051012: Swift-BAT detection of burst yesterday
  68. Swift-BAT Trigger 159578 is a possible burst
  69. GRB 051006: Swift/UVOT Upper Limits
  70. GRB051008: optical candidate
  71. GRB 051008 - a low redshift low-luminosity burst?
  72. GRB051011: bright nebulae near error box
  73. GRB051011: MASTER optical observation
  74. GRB051008: Final refined analysis of the Swift-BAT burst
  75. GRB051008: Radio Observation
  76. GRB 051008, optical observations
  77. GRB 051008: early Swift XRT analysis
  78. GRB 051008: Swift UVOT Candidate
  79. GRB 051006: P60 Observations
  80. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  81. GRB 051006: optical observations at Sierra Nevada
  82. GRB051006: Refined analysis of the Swift-BAT burst
  83. GRB051006: Swift detection of a burst
  84. GRB 050906, summary of radio observations
  85. GRB051001: Swift UVOT Upper Limits
  86. GRB 050925: Second Epoch WSRT Radio Observations
  87. GRB 051001: I-band limit
  88. GRB 051001: AAT infra-red observations
  89. GRB 051001: Swift-BAT refined analysis
  90. GRB 051001: Swift Detection of a Burst
  91. GRB 050820A: NIR photometry at the TNG
  92. GRB050925: Swift/XRT limits
  93. GRB/SGR 050925: IR Observations
  94. GRB 050922C: break in the lightcurve
  95. GRB050925: Swift UVOT upper limits
  96. Refined analysis of the Swift-BAT soft short burst
  97. GRB050925: Faulkes Telescope North R-band limit
  98. GRB050925: Swift-BAT detection of a short burst
  99. GRB050922C: TNG spectroscopic observations
  100. GRB050922B: refined XRT analysis

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