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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

26303 results found.

  1. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  2. GRB031225a triangulation (annulus)
  3. GRB031220: Palomar Observations
  4. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  5. GRB 2974 follow-up observations
  6. GRB031203, improved XMM position
  7. GRB 031203: Discovery of a dust echo
  8. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  9. GRB030921 triangulation (annulus)
  10. GRB 031203: SMARTS optical monitoring
  11. GRB 031203: Variable Radio Source
  12. IPN/HETE localization of GRB031203B (=H2949; large error box)
  13. XMM-Newton Observation of GRB031203
  14. GRB 031203: Deep NIR NTT & VLT observations
  15. XMM-Newton Observation of GRB031203
  16. GRB 031203: Radio detection
  17. GRB 031203: Further reports on December 4 observations
  18. GRB 031203: IR NTTobservations do not confirm REM detection
  19. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  20. GRB 031203: Apparent Spectral Break
  21. GRB031203: Optical Observations
  22. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  23. IPN/HETE localization of GRB031109 (=H2917; large error box)
  24. IPN detection of activity from SGR1806-20
  25. IPN triangulation of GRB031114 (large error box)
  26. IPN triangulation of GRB031107 (two large error boxes)
  27. HETE Prompt GRB Spectral Analyses
  28. IPN triangulation of GRB031111 (=H2924): small error box
  29. XRF031109 (=H2919): A very long XRF localized by HETE
  30. IPN triangulation of GRB031108 (large error box)
  31. GRB030929/SN2003jd association unlikely based on IPN localiztion
  32. IPN triangulation of GRB031027 (small error box)
  33. IPN triangulation of GRB031026B (large error box)
  34. Lulin optical follow-up observations of GRB031026
  35. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  36. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  37. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  38. IPN triangulation of GRB031024 (annulus)
  39. IPN triangulation of GRB031020 (large error box)
  40. IPN triangulation of GRB031016 (two large error boxes)
  41. IPN triangulation of GRB031014 (annulus)
  42. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  43. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  44. IPN triangulation of GRB031008 (annulus)
  45. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  46. IPN detection of continued activity from SGR1806-20
  47. IPN triangulation of GRB031007 (two large error boxes)
  48. IPN triangulation of GRB031004B (annulus)
  49. IPN triangulation of GRB031004A (short/hard; annulus)
  50. IPN triangulation of GRB030929 (short/hard; annulus)
  51. XRF 030824: Early follow-up observation at Kiso observatory
  52. IPN triangulation of GRB030922B (large error box)
  53. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  54. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  55. IPN triangulation of GRB030922A (large error box)
  56. IPN triangulation of GRB030921 (large error box)
  57. IPN triangulation of GRB030919 (large error box)
  58. GRB030922 triangulation (annulus)
  59. GRB030913: Subaru Optical Observations
  60. GRB 030913: ROTSE-3c Optical Observations
  61. GRB030913: OT's limit by MASTER
  62. GRB030921 triangulation (annulus)
  63. GRB030913: AAVSO optical observations
  64. GRB 030913, BOOTES observations
  65. GRB030913 (=H2849): Confirmation of the Flight Localization
  66. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  67. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  68. Magellan Observations of GRB030725 (=H2779)
  69. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  70. IPN triangulation of GRB030908 (annulus)
  71. GRB 030913: Optical limit at RIKEN
  72. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  73. IPN triangulation of GRB030903 (large error box)
  74. IBAS detection of bursts from SGR 1806-20
  75. IPN triangulation of GRB030831 (annulus)
  76. IPN triangulation of GRB030830 (large error box)
  77. GRB 030824: Candidate Follow-Up
  78. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  79. IPN triangulation of GRB030827 (large error box)
  80. XRF030824: Second-epoch Palomar observations
  81. IPN triangulation of GRB030822 (annulus)
  82. Lulin follow-up observations of GRB030823
  83. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  84. Summary of recent IPN and HETE detections of SGR bursts
  85. IPN triangulation of GRB030814 (annulus)
  86. IPN detection of continued activity from SGR1806-20
  87. 030813 SGR event (Konus-Wind observation)
  88. SGR 1808-20 (=H2802): A Possible new SGR
  89. IPN triangulation of GRB030808 (two large error boxes)
  90. IPN triangulation of GRB030806 (large burst; large error box)
  91. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  92. IPN/HETE summary of recent bursts from SGR1806-20
  93. XRF 030723: Detection of a rebrightening in the optical afterglow
  94. GRB030725: Optical observations
  95. IPN triangulation of GRB030801 (large error box)
  96. IPN triangulation of GRB030731 (annulus)
  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. GRB030725, optical transient observations

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