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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"

38417 results found.

  1. GRB 031203 XMM-Newton observation
  2. GRB 040223 : Planned XMM-Newton observation
  3. GRB 040106 : Planned XMM-Newton observation
  4. GRB 040223: further offline analysis
  5. GRB 040223: a long GRB detected with INTEGRAL
  6. GRB031111, optical observations
  7. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  8. GRB031203: Chandra Observations
  9. GRB040106, follow-up radio observations
  10. GRB040106: refined X-ray transient position
  11. Follow-up on IBAS GRB Alert 1379
  12. IBAS GRB alert 1379
  13. SN 2003dh/GRB030329 late-time optical spectroscopy
  14. GRB040106, Radio Observations
  15. GRB040106, likely optical afterglow
  16. GRB040106: Second Epoch Optical Observations
  17. GRB 031220: Optical observations of Chandra X-ray sources
  18. GRB031220: observation at Univercity of Miyazaki
  19. GRB 040106 : Planned XMM-Newton observation
  20. GRB 040106 : peak flux
  21. GRB 040106 : a long GRB detected with INTEGRAL
  22. IPN triangulation of an intermediate burst from SGR1806-20
  23. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  24. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  25. GRB031225a triangulation (annulus)
  26. IPN triangulation of GRB031219 (large error box)
  27. GRB031220: Palomar Observations
  28. GRB 031220 : Kyoto Optical Observation
  29. GRB 031220: Subaru observation
  30. GRB 031220: Optical observation at Tokyo Tech
  31. GRB031220: ROTSE-IIIb Optical Limits
  32. GRB031220 : Optical Observation of Lulin Observatory
  33. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  34. GRB 2974 follow-up observations
  35. GRB 031203: Discovery of a dust echo
  36. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  37. GRB030921 triangulation (annulus)
  38. GRB 031203: Variable Radio Source
  39. GRB 031203: Magellan spectrum of possible GRB host
  40. GRB 031203: Optical/IR Astrometry
  41. IPN/HETE localization of GRB031203B (=H2949; large error box)
  42. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  43. XMM-Newton Observation of GRB031203
  44. GRB 031203: Deep NIR NTT & VLT observations
  45. GRB031203: K' Photometry of the likely GRB host
  46. XMM-Newton Observation of GRB031203
  47. GRB 031203: Radio detection
  48. GRB 031203: Further reports on December 4 observations
  49. GRB 031203: IR NTTobservations do not confirm REM detection
  50. GRB031203 : Optical Observation of Lulin Observatory
  51. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  52. GRB031203: Planned XMM-Newton observation II
  53. GRB031203: Optical Observations
  54. GRB 031203 XMM-Newton observation
  55. GRB 031203: Optical/IR SMARTS Observations
  56. GRB031203: Planned XMM-Newton observation
  57. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  58. GRB 031203: further analysis of INTEGRAL data
  59. GRB 031203: A long GRB detected with INTEGRAL
  60. IPN triangulation of GRB031201 (large error box)
  61. IPN triangulation of GRB031130 (large error box)
  62. IPN triangulation of GRB031120 (two large error boxes)
  63. GRB 031111B (= H2925) : Kyoto Optical Observation
  64. IPN/HETE localization of GRB031109 (=H2917; large error box)
  65. IPN detection of activity from SGR1806-20
  66. GRB 031111, Radio observations
  67. IPN triangulation of GRB031114 (large error box)
  68. IPN triangulation of GRB031107 (two large error boxes)
  69. GRB 031111: Optical observations
  70. GRB 031111, optical observations
  71. HETE Prompt GRB Spectral Analyses
  72. IPN triangulation of GRB031111 (=H2924): small error box
  73. XRF031109 (=H2919): A very long XRF localized by HETE
  74. IPN triangulation of GRB031108 (large error box)
  75. GRB030929/SN2003jd association unlikely based on IPN localiztion
  76. IPN triangulation of GRB031027 (small error box)
  77. IPN triangulation of GRB031026B (large error box)
  78. SN 2003jd (SN/GRB?), Radio Observations
  79. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  80. GRB 031026: Further Ic Observations
  81. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  82. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  83. IPN triangulation of GRB031024 (single error box)
  84. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  85. GRB 031026: Ic Observations
  86. GRB031026 : KISO optical follow-up observation
  87. IPN triangulation of GRB031024 (annulus)
  88. IPN triangulation of GRB031020 (large error box)
  89. GRB030329: radio observations at RT-22 (CrAO)
  90. IPN triangulation of GRB031016 (two large error boxes)
  91. IBAS alert 1180 refers to a burst from SGR 1806-20
  92. IPN triangulation of GRB031014 (annulus)
  93. XRF 030824: additional observations at CFHT
  94. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  95. IPN triangulation of GRB031008 (annulus)
  96. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  97. IPN detection of continued activity from SGR1806-20
  98. IPN triangulation of GRB031007 (two large error boxes)
  99. XRF 030723: Subaru Optical Observations
  100. IPN triangulation of GRB031004B (annulus)

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