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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"

45674 results found.

  1. IPN triangulation of GRB030929 (short/hard; annulus)
  2. A burst from SGR 1806-20 detected with IBAS
  3. XRF 030824: Early follow-up observation at Kiso observatory
  4. XRF 030824: observations at CFHT
  5. IPN triangulation of GRB030926 (short/hard; large error box)
  6. IPN triangulation of GRB030922B (large error box)
  7. XRF 030723: Detection of the likely host galaxy
  8. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  9. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  10. IPN triangulation of GRB030922A (large error box)
  11. IPN triangulation of GRB030921 (large error box)
  12. IPN triangulation of GRB030919 (large error box)
  13. GRB030922 triangulation (annulus)
  14. GRB030913: Subaru Optical Observations
  15. GRB 030913: ROTSE-3c Optical Observations
  16. GRB030913: OT's limit by MASTER
  17. GRB030921 triangulation (annulus)
  18. GRB030913, candidate afterglow observations
  19. GRB 030913, optical candidate
  20. GRB030913: AAVSO optical observations
  21. GRB 030913, BOOTES observations
  22. GRB030913 (=H2849): Confirmation of the Flight Localization
  23. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  24. GRB030913 (=H2849): TAROT Observations
  25. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  26. Magellan Observations of GRB030725 (=H2779)
  27. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  28. IPN triangulation of GRB030908 (annulus)
  29. GRB 030913: Optical limit at RIKEN
  30. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  31. XRF030824: Optical observations
  32. IPN triangulation of GRB030903 (large error box)
  33. IBAS detection of bursts from SGR 1806-20
  34. Radio Observations of SGR1806-20
  35. IPN triangulation of GRB030831 (annulus)
  36. IPN triangulation of GRB030830 (large error box)
  37. GRB 030824: Candidate Follow-Up
  38. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  39. IPN triangulation of GRB030827 (large error box)
  40. GRB 030823 observation at Ouda
  41. XRF030824: Second-epoch Palomar observations
  42. XRF030824: optical observations
  43. IPN triangulation of GRB030822 (annulus)
  44. GRB030823: optical observations
  45. GRB030823: Palomar observations
  46. XRF030824: Palomar observations
  47. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  48. GRB030823: optical observation at Tokyo Tech
  49. RAPTOR observations of GRB030823
  50. Lulin follow-up observations of GRB030823
  51. IPN triangulation of GRB030821 (=H2814; refined error box)
  52. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  53. Summary of recent IPN and HETE detections of SGR bursts
  54. IPN triangulation of GRB030814 (annulus)
  55. Clarification of GCN 2354 on SGR1806-20
  56. IPN detection of continued activity from SGR1806-20
  57. 030813 SGR event (Konus-Wind observation)
  58. GRB 030817 = H2808 TAROT optical observations
  59. SGR 1808-20 (=H2802): A Possible new SGR
  60. GRB 021206 Optical Observations
  61. IPN triangulation of GRB030808 (two large error boxes)
  62. IPN triangulation of GRB030806 (large burst; large error box)
  63. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  64. IPN/HETE summary of recent bursts from SGR1806-20
  65. XRF 030723: Detection of a rebrightening in the optical afterglow
  66. GRB030725: Optical observations
  67. XRF030723, BVRcIc field photometry update
  68. IPN triangulation of GRB030801 (large error box)
  69. GRB021206 optical counterpart upper limit
  70. IPN triangulation of GRB030731 (annulus)
  71. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  72. XRF030723: Re-analysis of ROTSE-III early images
  73. IPN triangulation of GRB030725 (=H2779; small error box)
  74. XRF030723 (=H2777): Second Epoch Magellan Observations
  75. GRB 030725: optical observations.
  76. GRB030725, optical transient observations
  77. IPN triangulation of GRB030726 (large error box)
  78. IPN triangulation of GRB030722 (large error box)
  79. IPN triangulation of GRB030721 (large error box)
  80. XRF030723 Radio Observations
  81. XRF 030723: confirmation of fading optical counterpart
  82. XRF030723(=H2777): Chandra Observations
  83. XRF 030723: VLT spectra
  84. Magellan Observations of XRF030723 (=H2777)
  85. GRB030723: Upper limits from historical observations
  86. GRB030725, possible optical transient
  87. XRF030723: Palomar observations and proposed counterpart
  88. GRB030725 (=H2779): A Bright GRB Localized by HETE
  89. XRF030723: optical observations
  90. XRF030723 (= H2777): Chandra Observations Scheduled
  91. XRF030723, BVRcIc field photometry correction
  92. XRF030723, ROTSE-III Early Observations
  93. XRF030723, BVRcIc field photometry
  94. XRF 030723, optical observations
  95. XRF030723, optical observations
  96. XRF 030723, optical observations
  97. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  98. GRB030723, optical observations
  99. Konus-Wind detection of the bursts from SGR1806-20 region
  100. IBAS GRB Alerts 969 970

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