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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"

675 results found.

  1. Summary of recent IPN and HETE detections of SGR bursts
  2. Clarification of GCN 2354 on SGR1806-20
  3. IPN detection of continued activity from SGR1806-20
  4. 030813 SGR event (Konus-Wind observation)
  5. SGR 1808-20 (=H2802): A Possible new SGR
  6. SGR 1806-20, submm observations
  7. RXTE PCA Observations of SGR1806-20 Region
  8. HETE detection of burst from SGR1806-20
  9. GRB030329 observed as a sudden ionospheric disturbance (SID)
  10. IPN triangulation of GRB021219
  11. IPN detection of continued activity from SGR1806-20
  12. IPN detection of renewed activity from SGR1806-20
  13. IPN detection of continued SGR1900+14 activity
  14. IPN confirmation of the reactivation of SGR1900+14
  15. IPN detection of possible reactivation of SGR1900+14
  16. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  17. SGR1900+14 activity, November 2-4, 2002
  18. Detection of activity from SGR 1900+14 with the RXTE/PCA
  19. GRB021004: optical observations and predicted break time
  20. IPN detection of a burst from SGR1900+14
  21. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  22. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  23. AXP 1E2259+586: quasi-simultaneous optical observation
  24. AXP 1E2259+586 optical observations
  25. SGR-like Bursts from the AXP 1E 2259+586
  26. IPN detection of possible bursts from SGR1806-20
  27. XRF 020427: Sudden Ionospheric Disturbance (SID)
  28. Mars Odyssey joins the IPN
  29. IPN detection and localization of Cygnus X-1 flares
  30. RXTE Observations of SGR 1900+14
  31. SGR1900+14 activity
  32. IPN/HETE Detection of Bursts from SGR1900+14
  33. IPN detection of further activity from SGR1806-20
  34. GRB 011121: Radio Observations
  35. The X-ray Flash 011030 ('GRB 011030')
  36. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  37. GRB010923 as seen by BeppoSAX GRBM
  38. Probable SGR or Short Duration GRB Detected by HETE
  39. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  40. Possible burst from SGR1806-20
  41. IPN detection of SGR1900+14
  42. X-ray precursors to the large flare from SGR 1900+14
  43. SGR 1900+14: No evidence of extended X-ray emission
  44. SGR 1900+14 : RXTE observations
  45. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  46. SGR1900+14
  47. SGR 1900+14: Correction to GCN 1049
  48. Millimeter observation of SGR 1900+14
  49. SGR 1900+14: Detection of extended X-ray emission
  50. Chandra Observations of SGR 1900+14
  51. SGR 1900+14, Chandra observations
  52. Chandra Observations of SGR 1900+14
  53. SGR1900+14, I-band observations
  54. SGR 1806-20 burst activity
  55. BATSE GRB trigger criteria
  56. Optical Observations of GRB990907
  57. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  58. GRB990308 not a new SGR
  59. GRB990308, Possible new SGR~0209+70
  60. SGR1900+14, BeppoSAX-GRBM observations
  61. GRB980703 optical followup
  62. SGR1627-41
  63. SGR1627-41, RXTE/ASM observations
  64. Reduced error box of SGR 1627-41
  65. SGR 1627-41
  66. Discovery of a new SGR source, SGR1627-41
  67. SGR 1900+14
  68. SGR1900+14
  69. SGR1900+14
  70. BATSE on-board GRB trigger change
  71. GRB980326 X-ray Observations
  72. GRB971214: Keck R & I-band Observations
  73. IRAS 18119-1342 and the possible new SGR
  74. Possible new SGR from US Naval Observatory
  75. RXTE Observations of SGR 1814-13

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