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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"

37813 results found.

  1. GRB020322: BeppoSAX/NFI Observations
  2. Bepposax GRB020322 The second springtime BSAX GRB
  3. GRB 020321: Optical observations
  4. GRB 011121: Fourth Epoch of HST Imaging
  5. GRB020317: optical observations
  6. GRB020321 optical observations
  7. GRB020321: BeppoSAX/NFI Observations
  8. GRB020321: a faint BeppoSAX detection
  9. GRB 020317 : KISO Optical Observations
  10. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  11. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  12. GRB 020305: Optical Observations
  13. GRB020317, optical observations
  14. GRB 020317: Optical observations
  15. GRB 011121: Third HST Epoch
  16. GRB020305: Properties of the Candidate Optical Afterglow
  17. GRB 011121: HST Observations reveal an intermediate-time multicolor
  18. GRB011121, possible supernova association
  19. GRB011130 (XRF011130) Second Epoch Chandra Observations
  20. GRB020305: Subaru Optical Observations
  21. GRB 020305: Optical observations
  22. XRF/GRB 011030 Images
  23. XRF/GRB 011030: Detection of the Probable Host Galaxy
  24. GRB 020305: Candidate optical afterglow
  25. Type Ic SN2002bl (SN/GRB?) Radio Observations
  26. GRB020305: Optical Observations
  27. IPN triangulation of GRB020305 (HETE 1939)
  28. GRB020305 (=H1939): Localization of a GRB by HETE
  29. GRB 020305: Optical observations
  30. HST Imaging of the afterglow and host of GRB 011121
  31. GRB 010921: HST Observations
  32. IPN detection and localization of Cygnus X-1 flares
  33. GRB020127: Further VLA Observations of Possible Counterparts
  34. IPN detection of further SGR1900+14 activity
  35. SGR1900+14 activity
  36. IPN/HETE Detection of Bursts from SGR1900+14
  37. IPN Upper Limits to a GRB Associated With SN2002ap
  38. GRB020124 BVRI field photometry
  39. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  40. SN2002ap (SN/GRB?) Echelle spectra
  41. SN2002ap (SN/GRB?) optical spectrographic observations
  42. GRB020127 Optical Observations
  43. SN 2002ap (SN/GRB?)
  44. SN2002ap (SN/GRB?) UBVRI Field Photometry
  45. GRB020127: Chandra Observations and Prospective Counterparts
  46. pre-SN2002ap (SN/GRB?) imaging of M74
  47. SN 2002ap (hypernova / GRB ??): special list on VSNET
  48. Type Ib/c SN2002ap (SN/GRB?)
  49. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  50. GRB020124, optical observations
  51. GRB020127: Optical observations
  52. GRB 020127, I-band observations starting 3.14-hr after the event
  53. IPN detection of further activity from SGR1806-20
  54. IPN triangulation of GRB020127 (=H1902)
  55. GRB010921 Optical Observations
  56. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  57. GRB020124: Optical observations
  58. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  59. GRB020124: Optical observations
  60. GRB 020124: Optical observations
  61. GRB 020124 Optical Observations
  62. IPN triangulation of GRB020124 (HETE 1896)
  63. IPN observations of SGR1806-20
  64. GRB 020124: Optical afterglow
  65. GRB020124(=H1896): Localization of a Long GRB by HETE
  66. GRB optical counterpart candidate in GCN 1217 is M dwarf
  67. Possible optical counterpart to a GRB
  68. GRB011212, Optical Observations
  69. GRB 011211: Detection of the Probable Host Galaxy
  70. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  71. GRB 011211, spectrum and optical photometry
  72. GRB 011130: Optical Observations of X-ray and Radio Sources
  73. GRB 011130, Radio/X-ray Comparison
  74. GRB 011212: optical observation at Asiago
  75. GRB 011211: Evidence for an Optical Break
  76. GRB 011211: TNG Spectroscopic Observations
  77. optical follow-up of GRB(XRF) 011211
  78. GRB 011212: optical observation at Oslo (relayed)
  79. GRB 011211: Optical Spectroscopy
  80. GRB 011211, Optical Observations
  81. GRB011212, BVRI field photometry
  82. GRB011211, BVRI field photometry
  83. GRB011212: Optical observations
  84. GRB 011211: BVRi-band photometry
  85. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  86. Fading of the optical source associated of XRF 011211
  87. GRB 011211 Optical Observations: Likely Afterglow
  88. BeppoSAX Alert: GRB011211(=XRF011211)
  89. GRB 011130: Optical Observations of Chandra Sources
  90. GRB 011130: Optical Observations of Chandra sources
  91. GRB 011130: Magellan spectroscopy
  92. Sub-mm and Centimeter Detections of the Host Galaxy of GRB000418
  93. GRB011130, optical observations
  94. GRB 011130, K band observations
  95. GRB011130, optical observations
  96. GRB 011130 I-band Observation
  97. GRB011130 (XRF011130) optical observations
  98. GRB011130 (XRF011130) SDSS PT i-band observations
  99. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  100. XRF011130: NEAT Optical Observations

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