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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"

28105 results found.

  1. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  2. GRB 050306: R-band observations
  3. GRB 050306: REM optical-infrared observations
  4. GRB 050306: Possible X-ray Afterglow Position from the Swift
  5. GRB 050306: Swift-BAT detection of a long burst
  6. GRB050215B: Late-Time Swift UVOT Observations
  7. GRB 050126: Confirmation of the NIR afterglow candidate
  8. PROMPT VRcIc Observations of GRB 050223
  9. XRF/GRB 050215B: Radio Observations
  10. GRB 050219b: candidate NIR afterglow
  11. GRB 050223: optical observations
  12. GRB050223 XMM-Newton observation
  13. INTEGRAL detection of GRB 050223
  14. GRB050223: No Swift UVOT Detection of Afterglow Emission
  15. GRB050223: ROTSE-III Optical Observations
  16. GRB 050223 Swift/BAT detection of a burst
  17. GRB 050223: Swift XRT Position
  18. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  19. GRB050219b: CORRECTION to time of UVOT observations
  20. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  21. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  22. GRB 050219b: CORRECTION to refined XRT position
  23. GRB 050219a: Optical observations from LCO
  24. GRB 050219b: Optical and near-IR observations from LCO
  25. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  26. GRB 050219b: Refined XRT position
  27. GRB 050219b: Swift-BAT detection of a burst
  28. GRB 050219b: CORRECTION: Swift XRT Position
  29. GRB 050219b: Swift XRT Position
  30. GRB 050219a, optical observations
  31. GRB 050219a: Refined XRT position
  32. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  33. GRB 050219: Swift-BAT detection of a burst
  34. GRB050215b: Swift UVOT Detection of Afterglow Emission
  35. GRB 050219: Prompt X-ray position
  36. GRB 050215B: Radio Observations
  37. GRB 050215b: XRT confirmation of IR afterglow candidate
  38. GRB050215b: P60 Optical Observations
  39. GRB 050215b: Swift XRT Source Variability
  40. GRB 050215B: candidate afterglow
  41. GRB 050215B: UKIRT K-band imaging
  42. GRB 050215b: Swift XRT Observations
  43. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  44. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  45. short/hard GRB 050202, optical observations
  46. GRB 050128: Radio observations
  47. GRB 050128 Optical observation with REM
  48. SGR1806-20: Swift-BAT detection of a large normal burst
  49. GRB050128: Faulkes Telescope South observations
  50. GRB 050124: Radio Observations
  51. GRB 050128: near-infrared observations with REM
  52. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  53. GRB050126: Updated Swift XRT Position
  54. SGR 1806-20: GMRT results at 240 MHz band.
  55. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  56. GRB 050126: Radio Observations
  57. GRB050128 Swift-BAT observations
  58. GRB 050128: Swift XRT prompt afterglow position
  59. GRB 050124: K-band afterglow observations
  60. GRB050126: MASTER optical limit for KECK OT
  61. GRB050126: Burst Parameters Measured by BAT
  62. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  63. GRB 050126: Prompt XRT detection and localization
  64. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  65. GRB050124: No Swift UVOT Detection of Afterglow Emission
  66. GRB 050124, SMARTS optical/IR observations
  67. GRB 050117a: Radio Observations
  68. GRB 050124: NIR Candidates from Keck/NIRC
  69. GRB050124: Updated Swift XRT Position and Fluxes
  70. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  71. CFHTLS optical transient unlikely to be a GRB
  72. Unusual optical transient (GRB ???)
  73. GRB050117a: Radio Observations
  74. GRB050117: Palomar WIRC Ks-band observations
  75. GRB050117b: Swift-BAT detection of a weak burst
  76. GRB050117: optical observation
  77. GRB 050117, I-band observations
  78. GRB 050117: Optical observation
  79. GRB050117: Refined XRT position
  80. GRB050117: Swift-BAT detection of a long multi-peaked burst
  81. GRB050117: Swift XRT Position
  82. SGR 1806-20: Further low frequency GMRT results
  83. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  84. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  85. SGR 1806-20: Temporal and Spectral behavior of radio transient
  86. Second-epoch VLA observations of SGR 1806-20
  87. SGR1806: Detection of a Sudden Ionospheric Disturbance
  88. DETECTION OF POLARIZATION OF THE RADIO EMISSION FROM SGR 1806-20
  89. SGR1806 VLA Observations
  90. GRB 041217: Optical observations
  91. SGR1806-20: Swift-BAT observation of the 041227 super-flare
  92. GRB041219, early time observations
  93. Detection of the SGR 1806-20 giant outburst back-scattered by the
  94. GRB041228: Swift-BAT detection of a burst
  95. GRB041219; RXTE ASM Observations
  96. NIR Observations of GRB 041219
  97. GRB041226: Swift-BAT detection of a burst
  98. GRB041223: decay of the afterglow
  99. GRB 041223: XRT afterglow spectrum and light curve
  100. GRB041224: Swift-BAT detection of a soft burst

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