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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

34221 results found.

  1. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  2. GRB 2974 follow-up observations
  3. GRB 031203: Discovery of a dust echo
  4. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  5. GRB030921 triangulation (annulus)
  6. GRB 031203: SMARTS optical monitoring
  7. GRB 021203: A Normal GRB viewed far off axis?
  8. GRB 031203: Variable Radio Source
  9. GRB 031203: Magellan spectrum of possible GRB host
  10. GRB 031203: Optical/IR Astrometry
  11. IPN/HETE localization of GRB031203B (=H2949; large error box)
  12. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  13. GRB 031203: Deep NIR NTT & VLT observations
  14. GRB031203: K' Photometry of the likely GRB host
  15. GRB 031203: Radio detection
  16. GRB 031203: Further reports on December 4 observations
  17. GRB 031203: IR NTTobservations do not confirm REM detection
  18. GRB031203 : Optical Observation of Lulin Observatory
  19. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  20. GRB 031203: Apparent Spectral Break
  21. GRB 031203: IR REM Observations
  22. GRB031203: Optical Observations
  23. GRB 031203 XMM-Newton observation
  24. GRB 031203: Optical/IR SMARTS Observations
  25. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  26. GRB 031203: further analysis of INTEGRAL data
  27. GRB 031203: A long GRB detected with INTEGRAL
  28. IPN triangulation of GRB031201 (large error box)
  29. IPN triangulation of GRB031130 (large error box)
  30. GRB031111A, prompt optical observations
  31. GRB 030329: Planned XMM-Newton Observation
  32. IPN triangulation of GRB031120 (two large error boxes)
  33. GRB 031111B (= H2925) : Kyoto Optical Observation
  34. IPN/HETE localization of GRB031109 (=H2917; large error box)
  35. IPN detection of activity from SGR1806-20
  36. GRB 031111, Radio observations
  37. IPN triangulation of GRB031114 (large error box)
  38. IPN triangulation of GRB031107 (two large error boxes)
  39. GRB 031111: Optical observations
  40. GRB 031111, optical observations
  41. SN 2003jd (SN/GRB?) -- X-ray Observations
  42. HETE Prompt GRB Spectral Analyses
  43. IPN triangulation of GRB031111 (=H2924): small error box
  44. IPN triangulation of GRB031108 (large error box)
  45. GRB030929/SN2003jd association unlikely based on IPN localiztion
  46. IPN triangulation of GRB031027 (small error box)
  47. IPN triangulation of GRB031026B (large error box)
  48. SN 2003jd (SN/GRB?), Radio Observations
  49. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  50. GRB 031026: Further Ic Observations
  51. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  52. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  53. IPN triangulation of GRB031024 (single error box)
  54. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  55. GRB 031026: Ic Observations
  56. GRB031026 : KISO optical follow-up observation
  57. IPN triangulation of GRB031024 (annulus)
  58. IPN triangulation of GRB031020 (large error box)
  59. IPN triangulation of GRB031016 (two large error boxes)
  60. IBAS alert 1180 refers to a burst from SGR 1806-20
  61. HETE Prompt GRB Light Curves and Color-Color Diagrams
  62. IPN triangulation of GRB031014 (annulus)
  63. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  64. IPN triangulation of GRB031008 (annulus)
  65. IPN detection of continued activity from SGR1806-20
  66. IPN triangulation of GRB031007 (two large error boxes)
  67. XRF 030723: Subaru Optical Observations
  68. IPN triangulation of GRB031004B (annulus)
  69. IPN triangulation of GRB031004A (short/hard; annulus)
  70. IPN triangulation of GRB030929 (short/hard; annulus)
  71. XRF 030824: Early follow-up observation at Kiso observatory
  72. XRF 030824: observations at CFHT
  73. IPN triangulation of GRB030926 (short/hard; large error box)
  74. IPN triangulation of GRB030922B (large error box)
  75. XRF 030723: Detection of the likely host galaxy
  76. IPN triangulation of GRB030922A (large error box)
  77. IPN triangulation of GRB030921 (large error box)
  78. IPN triangulation of GRB030919 (large error box)
  79. GRB030922 triangulation (annulus)
  80. GRB030913: Subaru Optical Observations
  81. GRB 030913: ROTSE-3c Optical Observations
  82. GRB030913: OT's limit by MASTER
  83. GRB030921 triangulation (annulus)
  84. GRB030913, candidate afterglow observations
  85. GRB 030913, optical candidate
  86. GRB 030913, BOOTES observations
  87. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  88. GRB030913 (=H2849): TAROT Observations
  89. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  90. Magellan Observations of GRB030725 (=H2779)
  91. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  92. IPN triangulation of GRB030908 (annulus)
  93. GRB 030913: Optical limit at RIKEN
  94. XRF030824: Optical observations
  95. IPN triangulation of GRB030903 (large error box)
  96. IPN triangulation of GRB030831 (annulus)
  97. IPN triangulation of GRB030830 (large error box)
  98. GRB 030824: Candidate Follow-Up
  99. IPN triangulation of GRB030827 (large error box)
  100. GRB 030823 observation at Ouda

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