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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.

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

38417 results found.

  1. IPN triangulation of GRB031004A (short/hard; annulus)
  2. IPN triangulation of GRB030929 (short/hard; annulus)
  3. A burst from SGR 1806-20 detected with IBAS
  4. XRF 030824: Early follow-up observation at Kiso observatory
  5. XRF 030824: observations at CFHT
  6. IPN triangulation of GRB030926 (short/hard; large error box)
  7. IPN triangulation of GRB030922B (large error box)
  8. XRF 030723: Detection of the likely host galaxy
  9. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  10. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  11. IPN triangulation of GRB030922A (large error box)
  12. IPN triangulation of GRB030921 (large error box)
  13. IPN triangulation of GRB030919 (large error box)
  14. GRB030922 triangulation (annulus)
  15. GRB030913: Subaru Optical Observations
  16. GRB 030913: ROTSE-3c Optical Observations
  17. GRB030913: OT's limit by MASTER
  18. GRB030921 triangulation (annulus)
  19. GRB030913, candidate afterglow observations
  20. GRB 030913, optical candidate
  21. GRB030913: AAVSO optical observations
  22. GRB 030913, BOOTES observations
  23. GRB030913 (=H2849): Confirmation of the Flight Localization
  24. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  25. GRB030913 (=H2849): TAROT Observations
  26. Magellan Observations of GRB030725 (=H2779)
  27. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  28. IPN triangulation of GRB030908 (annulus)
  29. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  30. XRF030824: Optical observations
  31. IPN triangulation of GRB030903 (large error box)
  32. IBAS detection of bursts from SGR 1806-20
  33. Radio Observations of SGR1806-20
  34. IPN triangulation of GRB030831 (annulus)
  35. IPN triangulation of GRB030830 (large error box)
  36. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  37. IPN triangulation of GRB030827 (large error box)
  38. XRF030824: Second-epoch Palomar observations
  39. XRF030824: optical observations
  40. IPN triangulation of GRB030822 (annulus)
  41. GRB030823: Palomar observations
  42. XRF030824: Palomar observations
  43. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  44. GRB030823: optical observation at Tokyo Tech
  45. RAPTOR observations of GRB030823
  46. IPN triangulation of GRB030821 (=H2814; refined error box)
  47. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  48. Summary of recent IPN and HETE detections of SGR bursts
  49. IPN triangulation of GRB030814 (annulus)
  50. Clarification of GCN 2354 on SGR1806-20
  51. IPN detection of continued activity from SGR1806-20
  52. 030813 SGR event (Konus-Wind observation)
  53. GRB 030817 = H2808 TAROT optical observations
  54. SGR 1808-20 (=H2802): A Possible new SGR
  55. GRB 021206 Optical Observations
  56. IPN triangulation of GRB030808 (two large error boxes)
  57. IPN triangulation of GRB030806 (large burst; large error box)
  58. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  59. IPN/HETE summary of recent bursts from SGR1806-20
  60. XRF 030723: Detection of a rebrightening in the optical afterglow
  61. XRF030723, BVRcIc field photometry update
  62. IPN triangulation of GRB030801 (large error box)
  63. GRB021206 optical counterpart upper limit
  64. IPN triangulation of GRB030731 (annulus)
  65. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  66. XRF030723: Re-analysis of ROTSE-III early images
  67. IPN triangulation of GRB030725 (=H2779; small error box)
  68. XRF030723 (=H2777): Second Epoch Magellan Observations
  69. GRB 030725: optical observations.
  70. GRB030725, optical transient observations
  71. IPN triangulation of GRB030726 (large error box)
  72. IPN triangulation of GRB030722 (large error box)
  73. IPN triangulation of GRB030721 (large error box)
  74. XRF030723 Radio Observations
  75. XRF 030723: confirmation of fading optical counterpart
  76. XRF030723(=H2777): Chandra Observations
  77. XRF 030723: VLT spectra
  78. Magellan Observations of XRF030723 (=H2777)
  79. GRB030725, possible optical transient
  80. XRF030723: Palomar observations and proposed counterpart
  81. GRB030725 (=H2779): A Bright GRB Localized by HETE
  82. XRF030723: optical observations
  83. XRF030723 (= H2777): Chandra Observations Scheduled
  84. XRF030723, ROTSE-III Early Observations
  85. XRF030723, BVRcIc field photometry
  86. XRF 030723, optical observations
  87. XRF030723, optical observations
  88. XRF 030723, optical observations
  89. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  90. GRB030723, optical observations
  91. Konus-Wind detection of the bursts from SGR1806-20 region
  92. IBAS GRB Alerts 969 970
  93. SGR 1806-20, submm observations
  94. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  95. IPN triangulation of GRB030717 (annulus)
  96. RXTE PCA Observations of SGR1806-20 Region
  97. GRB030329: Subaru Optical Spectroscopy
  98. Triangulation of GRB030715 (single large error box)
  99. Triangulation of GRB030714 (single large error box)
  100. 030716 NOT a GRB

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