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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"

44635 results found.

  1. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  2. GRB 031026: Further Ic Observations
  3. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  4. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  5. IPN triangulation of GRB031024 (single error box)
  6. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  7. GRB 031026: Ic Observations
  8. GRB031026 : KISO optical follow-up observation
  9. IPN triangulation of GRB031024 (annulus)
  10. IPN triangulation of GRB031020 (large error box)
  11. GRB030329: radio observations at RT-22 (CrAO)
  12. IPN triangulation of GRB031016 (two large error boxes)
  13. IBAS alert 1180 refers to a burst from SGR 1806-20
  14. HETE Prompt GRB Light Curves and Color-Color Diagrams
  15. IPN triangulation of GRB031014 (annulus)
  16. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  17. XRF 030824: additional observations at CFHT
  18. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  19. IPN triangulation of GRB031008 (annulus)
  20. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  21. IPN detection of continued activity from SGR1806-20
  22. IPN triangulation of GRB031007 (two large error boxes)
  23. XRF 030723: Subaru Optical Observations
  24. IPN triangulation of GRB031004B (annulus)
  25. IPN triangulation of GRB031004A (short/hard; annulus)
  26. IPN triangulation of GRB030929 (short/hard; annulus)
  27. A burst from SGR 1806-20 detected with IBAS
  28. XRF 030824: Early follow-up observation at Kiso observatory
  29. XRF 030824: observations at CFHT
  30. IPN triangulation of GRB030926 (short/hard; large error box)
  31. IPN triangulation of GRB030922B (large error box)
  32. XRF 030723: Detection of the likely host galaxy
  33. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  34. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  35. IPN triangulation of GRB030922A (large error box)
  36. IPN triangulation of GRB030921 (large error box)
  37. IPN triangulation of GRB030919 (large error box)
  38. GRB030922 triangulation (annulus)
  39. GRB030913: Subaru Optical Observations
  40. GRB 030913: ROTSE-3c Optical Observations
  41. GRB030913: OT's limit by MASTER
  42. GRB030921 triangulation (annulus)
  43. GRB030913, candidate afterglow observations
  44. GRB 030913, optical candidate
  45. GRB030913: AAVSO optical observations
  46. GRB 030913, BOOTES observations
  47. GRB030913 (=H2849): Confirmation of the Flight Localization
  48. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  49. GRB030913 (=H2849): TAROT Observations
  50. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  51. Magellan Observations of GRB030725 (=H2779)
  52. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  53. IPN triangulation of GRB030908 (annulus)
  54. GRB 030913: Optical limit at RIKEN
  55. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  56. XRF030824: Optical observations
  57. IPN triangulation of GRB030903 (large error box)
  58. IBAS detection of bursts from SGR 1806-20
  59. Radio Observations of SGR1806-20
  60. IPN triangulation of GRB030831 (annulus)
  61. IPN triangulation of GRB030830 (large error box)
  62. GRB 030824: Candidate Follow-Up
  63. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  64. IPN triangulation of GRB030827 (large error box)
  65. GRB 030823 observation at Ouda
  66. XRF030824: Second-epoch Palomar observations
  67. XRF030824: optical observations
  68. IPN triangulation of GRB030822 (annulus)
  69. GRB030823: optical observations
  70. GRB030823: Palomar observations
  71. XRF030824: Palomar observations
  72. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  73. GRB030823: optical observation at Tokyo Tech
  74. RAPTOR observations of GRB030823
  75. Lulin follow-up observations of GRB030823
  76. IPN triangulation of GRB030821 (=H2814; refined error box)
  77. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  78. Summary of recent IPN and HETE detections of SGR bursts
  79. IPN triangulation of GRB030814 (annulus)
  80. Clarification of GCN 2354 on SGR1806-20
  81. IPN detection of continued activity from SGR1806-20
  82. 030813 SGR event (Konus-Wind observation)
  83. GRB 030817 = H2808 TAROT optical observations
  84. SGR 1808-20 (=H2802): A Possible new SGR
  85. GRB 021206 Optical Observations
  86. IPN triangulation of GRB030808 (two large error boxes)
  87. IPN triangulation of GRB030806 (large burst; large error box)
  88. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  89. IPN/HETE summary of recent bursts from SGR1806-20
  90. XRF 030723: Detection of a rebrightening in the optical afterglow
  91. GRB030725: Optical observations
  92. XRF030723, BVRcIc field photometry update
  93. IPN triangulation of GRB030801 (large error box)
  94. GRB021206 optical counterpart upper limit
  95. IPN triangulation of GRB030731 (annulus)
  96. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  97. XRF030723: Re-analysis of ROTSE-III early images
  98. IPN triangulation of GRB030725 (=H2779; small error box)
  99. XRF030723 (=H2777): Second Epoch Magellan Observations
  100. GRB 030725: optical observations.

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