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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"

28233 results found.

  1. GRB 051109a: IR Photometry and Astrometry
  2. GRB051109: Swift detection of a burst
  3. GRB 051109a: IR Detections
  4. GRB051105B: Swift/XRT upper limit
  5. GRB051105B: Swift/UVOT upper limit
  6. GRB051103: MASTER: OT limit and host galaxy candidates
  7. GRB051028: Swift-XRT refined analysis
  8. GRB 051105a, observation from Naini Tal and OSN
  9. GRB 051105a: MDM Observations
  10. GRB 051105A: TNG optical observations
  11. GRB051105A: Swift/UVOT Observations
  12. GRB 051105A, radio observations
  13. GRB051103:_MASTER_optical_observations
  14. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  15. GRB 051105A, optical observations
  16. XRT observations of GRB 051105A
  17. GRB 051105b: ART optical limits
  18. GRB 051105B (INTEGRAL 2701): Optical observation
  19. GRB 051105: Swift detection of a short burst
  20. Recent GRB UBVRcIc field photometry
  21. GRB051028 SARA Observation
  22. GRB051028: optical observations
  23. GRB051028: Swift/UVOT upper limits
  24. GRB051028: Swift XRT Position
  25. GRB051028:MASTER observations
  26. GRB051021B: Swift/UVOT Upper limits
  27. GRB 051021, Optical Observations
  28. GRB 051022: XRT Refined Spectral and Temporal Analysis
  29. GRB051012: Swift-XRT analysis
  30. GRB051021B: Swift XRT refined analysis
  31. GRB 051022, mm counterpart
  32. GRB 051022: Swift/UVOT Upper Limits
  33. GRB051022: Radio Counterpart
  34. GRB051022: IR observations
  35. GRB051021A: Swift XRT refined analysis
  36. GRB051022: Optical Observations
  37. GRB051021b: Magellan IR Imaging
  38. GRB 051021, SMARTS optical/IR observations
  39. GRB051022: Swift XRT Position
  40. GRB 051021: P200 Ks Observations
  41. GRB 051022 (=H3950): SXC Flight Localization is Valid
  42. GRB051021: Swift/UVOT Upper Limits
  43. GRB 051021B: Refined analysis of the Swift-BAT burst
  44. GRB 051022: SSO40 Optical Observations
  45. GRB051022,optical observation
  46. GRB 051021,optical observation
  47. GRB 051021B: Swift detection of a burst
  48. GRB 051021 : optical afterglow observation at Lulin
  49. GRB 051021: Optical observations and candidate afterglow
  50. GRB051021.63
  51. GRB051021.6: MASTER optical observation
  52. GRB051021: A GRB Localized by HETE
  53. Swift-BAT triggered on a posible CR Shower or possible GRB
  54. GRB 051016b: Optical limit
  55. Afterglow candidate of GRB 051016B observed at Lulin
  56. GRB 051016A: Swift/UVOT upper limits
  57. GRB 051016B: refined analysis of the Swift/XRT data
  58. GRB 051016B: Swift/UVOT detection
  59. GRB 051016B,optical observation
  60. GRB 051016B : Optical follow-up at Lulin
  61. GRB 051016B: Refined analysis of the Swift-BAT burst
  62. GRB 051016B: Swift detection of a soft burst
  63. GRB 051016: Swift-BAT refined analysis
  64. GRB051016 XMM-Newton observation
  65. GRB051016: Swift XRT refined analysis.
  66. GRB 051016: PROMPT Observations
  67. GRB051016: Swift detection of a burst
  68. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  69. GRB 051012: Swift-BAT detection of burst yesterday
  70. Swift-BAT Trigger 159578 is a possible burst
  71. GRB 051006: Swift/UVOT Upper Limits
  72. GRB051008: optical candidate
  73. GRB 051008 - a low redshift low-luminosity burst?
  74. GRB051011: bright nebulae near error box
  75. GRB051011: MASTER optical observation
  76. GRB051008: Final refined analysis of the Swift-BAT burst
  77. GRB051008: Radio Observation
  78. GRB 051008, optical observations
  79. GRB 051008: early Swift XRT analysis
  80. GRB 051008: Swift UVOT Candidate
  81. GRB 051006: P60 Observations
  82. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  83. GRB 051006: optical observations at Sierra Nevada
  84. GRB051006: Refined analysis of the Swift-BAT burst
  85. GRB051006: Swift detection of a burst
  86. GRB 050906, summary of radio observations
  87. GRB051001: Swift UVOT Upper Limits
  88. GRB 050925: Second Epoch WSRT Radio Observations
  89. GRB 051001: I-band limit
  90. GRB 051001: AAT infra-red observations
  91. GRB 051001: Swift-BAT refined analysis
  92. GRB 051001: Swift Detection of a Burst
  93. GRB 050820A: NIR photometry at the TNG
  94. GRB050925: Swift/XRT limits
  95. GRB/SGR 050925: IR Observations
  96. GRB 050922C: break in the lightcurve
  97. GRB050925: Swift UVOT upper limits
  98. Refined analysis of the Swift-BAT soft short burst
  99. GRB050925: Faulkes Telescope North R-band limit
  100. GRB050925: Swift-BAT detection of a short burst

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