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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"

38005 results found.

  1. GRB 021203: A Normal GRB viewed far off axis?
  2. GRB 031203: Variable Radio Source
  3. GRB 031203: Magellan spectrum of possible GRB host
  4. GRB 031203: Optical/IR Astrometry
  5. IPN/HETE localization of GRB031203B (=H2949; large error box)
  6. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  7. GRB 031203: Deep NIR NTT & VLT observations
  8. GRB031203: K' Photometry of the likely GRB host
  9. GRB 031203: Radio detection
  10. GRB 031203: Further reports on December 4 observations
  11. GRB 031203: IR NTTobservations do not confirm REM detection
  12. GRB031203 : Optical Observation of Lulin Observatory
  13. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  14. GRB 031203: Apparent Spectral Break
  15. GRB 031203: IR REM Observations
  16. GRB031203: Optical Observations
  17. GRB 031203 XMM-Newton observation
  18. GRB 031203: Optical/IR SMARTS Observations
  19. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  20. GRB 031203: further analysis of INTEGRAL data
  21. GRB 031203: A long GRB detected with INTEGRAL
  22. IPN triangulation of GRB031201 (large error box)
  23. IPN triangulation of GRB031130 (large error box)
  24. GRB031111A, prompt optical observations
  25. GRB 030329: Planned XMM-Newton Observation
  26. IPN triangulation of GRB031120 (two large error boxes)
  27. GRB 031111B (= H2925) : Kyoto Optical Observation
  28. IPN/HETE localization of GRB031109 (=H2917; large error box)
  29. IPN detection of activity from SGR1806-20
  30. GRB 031111, Radio observations
  31. IPN triangulation of GRB031114 (large error box)
  32. IPN triangulation of GRB031107 (two large error boxes)
  33. GRB 031111: Optical observations
  34. GRB 031111, optical observations
  35. SN 2003jd (SN/GRB?) -- X-ray Observations
  36. HETE Prompt GRB Spectral Analyses
  37. IPN triangulation of GRB031111 (=H2924): small error box
  38. IPN triangulation of GRB031108 (large error box)
  39. GRB030929/SN2003jd association unlikely based on IPN localiztion
  40. IPN triangulation of GRB031027 (small error box)
  41. IPN triangulation of GRB031026B (large error box)
  42. SN 2003jd (SN/GRB?), Radio Observations
  43. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  44. GRB 031026: Further Ic Observations
  45. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  46. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  47. IPN triangulation of GRB031024 (single error box)
  48. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  49. GRB 031026: Ic Observations
  50. GRB031026 : KISO optical follow-up observation
  51. IPN triangulation of GRB031024 (annulus)
  52. IPN triangulation of GRB031020 (large error box)
  53. IPN triangulation of GRB031016 (two large error boxes)
  54. IBAS alert 1180 refers to a burst from SGR 1806-20
  55. HETE Prompt GRB Light Curves and Color-Color Diagrams
  56. IPN triangulation of GRB031014 (annulus)
  57. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  58. IPN triangulation of GRB031008 (annulus)
  59. IPN detection of continued activity from SGR1806-20
  60. IPN triangulation of GRB031007 (two large error boxes)
  61. XRF 030723: Subaru Optical Observations
  62. IPN triangulation of GRB031004B (annulus)
  63. IPN triangulation of GRB031004A (short/hard; annulus)
  64. IPN triangulation of GRB030929 (short/hard; annulus)
  65. XRF 030824: Early follow-up observation at Kiso observatory
  66. XRF 030824: observations at CFHT
  67. IPN triangulation of GRB030926 (short/hard; large error box)
  68. IPN triangulation of GRB030922B (large error box)
  69. IPN triangulation of GRB030922A (large error box)
  70. IPN triangulation of GRB030921 (large error box)
  71. IPN triangulation of GRB030919 (large error box)
  72. GRB030922 triangulation (annulus)
  73. GRB030913: Subaru Optical Observations
  74. GRB 030913: ROTSE-3c Optical Observations
  75. GRB030913: OT's limit by MASTER
  76. GRB030921 triangulation (annulus)
  77. GRB030913, candidate afterglow observations
  78. GRB 030913, optical candidate
  79. GRB 030913, BOOTES observations
  80. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  81. GRB030913 (=H2849): TAROT Observations
  82. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  83. Magellan Observations of GRB030725 (=H2779)
  84. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  85. IPN triangulation of GRB030908 (annulus)
  86. GRB 030913: Optical limit at RIKEN
  87. XRF030824: Optical observations
  88. IPN triangulation of GRB030903 (large error box)
  89. IPN triangulation of GRB030831 (annulus)
  90. IPN triangulation of GRB030830 (large error box)
  91. GRB 030824: Candidate Follow-Up
  92. IPN triangulation of GRB030827 (large error box)
  93. GRB 030823 observation at Ouda
  94. XRF030824: Second-epoch Palomar observations
  95. IPN triangulation of GRB030822 (annulus)
  96. GRB030823: Palomar observations
  97. XRF030824: Palomar observations
  98. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  99. IPN triangulation of GRB030821 (=H2814; refined error box)
  100. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN

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