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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"

28199 results found.

  1. GRB 050126: Confirmation of the NIR afterglow candidate
  2. PROMPT VRcIc Observations of GRB 050223
  3. XRF/GRB 050215B: Radio Observations
  4. GRB 050219b: candidate NIR afterglow
  5. GRB 050223: optical observations
  6. GRB050223 XMM-Newton observation
  7. INTEGRAL detection of GRB 050223
  8. GRB050223: No Swift UVOT Detection of Afterglow Emission
  9. GRB050223: ROTSE-III Optical Observations
  10. GRB 050223 Swift/BAT detection of a burst
  11. GRB 050223: Swift XRT Position
  12. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  13. GRB050219b: CORRECTION to time of UVOT observations
  14. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  15. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  16. GRB 050219b: CORRECTION to refined XRT position
  17. GRB 050219a: Optical observations from LCO
  18. GRB 050219b: Optical and near-IR observations from LCO
  19. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  20. GRB 050219b: Refined XRT position
  21. GRB 050219b: Swift-BAT detection of a burst
  22. GRB 050219b: CORRECTION: Swift XRT Position
  23. GRB 050219b: Swift XRT Position
  24. GRB 050219a, optical observations
  25. GRB 050219a: Refined XRT position
  26. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  27. GRB 050219: Swift-BAT detection of a burst
  28. GRB050215b: Swift UVOT Detection of Afterglow Emission
  29. GRB 050219: Prompt X-ray position
  30. GRB 050215B: Radio Observations
  31. GRB 050215b: XRT confirmation of IR afterglow candidate
  32. GRB050215b: P60 Optical Observations
  33. GRB 050215b: Swift XRT Source Variability
  34. GRB 050215B: candidate afterglow
  35. GRB 050215B: UKIRT K-band imaging
  36. GRB 050215b: Swift XRT Observations
  37. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  38. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  39. short/hard GRB 050202, optical observations
  40. GRB 050128: Radio observations
  41. GRB 050128 Optical observation with REM
  42. SGR1806-20: Swift-BAT detection of a large normal burst
  43. GRB050128: Faulkes Telescope South observations
  44. GRB 050124: Radio Observations
  45. GRB 050128: near-infrared observations with REM
  46. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  47. GRB050126: Updated Swift XRT Position
  48. SGR 1806-20: GMRT results at 240 MHz band.
  49. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  50. GRB 050126: Radio Observations
  51. GRB050128 Swift-BAT observations
  52. GRB 050128: Swift XRT prompt afterglow position
  53. GRB 050124: K-band afterglow observations
  54. GRB050126: MASTER optical limit for KECK OT
  55. GRB050126: Burst Parameters Measured by BAT
  56. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  57. GRB 050126: Prompt XRT detection and localization
  58. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  59. GRB050124: No Swift UVOT Detection of Afterglow Emission
  60. GRB 050124, SMARTS optical/IR observations
  61. GRB 050117a: Radio Observations
  62. GRB 050124: NIR Candidates from Keck/NIRC
  63. GRB050124: Updated Swift XRT Position and Fluxes
  64. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  65. CFHTLS optical transient unlikely to be a GRB
  66. Unusual optical transient (GRB ???)
  67. GRB050117a: Radio Observations
  68. GRB050117: Palomar WIRC Ks-band observations
  69. GRB050117b: Swift-BAT detection of a weak burst
  70. GRB050117: optical observation
  71. GRB 050117, I-band observations
  72. GRB 050117: Optical observation
  73. GRB050117: Refined XRT position
  74. GRB050117: Swift-BAT detection of a long multi-peaked burst
  75. GRB050117: Swift XRT Position
  76. SGR 1806-20: Further low frequency GMRT results
  77. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  78. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  79. SGR 1806-20: Temporal and Spectral behavior of radio transient
  80. Second-epoch VLA observations of SGR 1806-20
  81. SGR1806: Detection of a Sudden Ionospheric Disturbance
  82. DETECTION OF POLARIZATION OF THE RADIO EMISSION FROM SGR 1806-20
  83. SGR1806 VLA Observations
  84. GRB 041217: Optical observations
  85. SGR1806-20: Swift-BAT observation of the 041227 super-flare
  86. GRB041219, early time observations
  87. Detection of the SGR 1806-20 giant outburst back-scattered by the
  88. GRB041228: Swift-BAT detection of a burst
  89. GRB041219; RXTE ASM Observations
  90. NIR Observations of GRB 041219
  91. GRB041226: Swift-BAT detection of a burst
  92. GRB041223: decay of the afterglow
  93. GRB 041223: XRT afterglow spectrum and light curve
  94. GRB041224: Swift-BAT detection of a soft burst
  95. GRB041223: optical and NIR observations with REM
  96. Swift-BAT Time History of GRB041219
  97. GRB 041223: J-band observations of the afterglow
  98. GRB 041223: Detection of Optical Transient with LCO40
  99. GRB041223: Swift XRT Detection of X-ray Afterglow Emission
  100. GRB041223: Swift-BAT detection of a bright long burst

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