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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"

25603 results found.

  1. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  2. GRB010921 Optical Observations
  3. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  4. HETE Trigger #1760 (GRB 010920B?): a new optical source
  5. HETE Trigger #1759 (GRB 010920?) optical observations
  6. BeppoSAX/GRBM detection of GRB 010801
  7. GCN and HETE status
  8. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  9. GRB 010629 Optical Observations
  10. IPN triangulation of GRB010613
  11. IPN triangulation of GRB010612
  12. GRB010518: a faint BeppoSAX detection
  13. GRB010324: BeppoSAX/GRBM data
  14. GRB 010214: X-Ray afterglow
  15. GRB010213, optical observations
  16. GRB010126: CONCAM crude optical limits during GRB
  17. HETE positions added to GCN
  18. CONCAM null result on GRB001005
  19. CONCAM crude optical limits before and after GRB000926
  20. GRB000607, optical observations
  21. GRB 000615: NIR observations
  22. IPN triangulation of GRB000519
  23. RXTE/ASM and IPN localization of GRB 000508B
  24. BeppoSAX GRB000424
  25. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  26. GRB000408, lotis optical observations
  27. GRB 000313 - optical transient in the BATSE error box
  28. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  29. BATSE GRB trigger criterion changed
  30. GRB000210 X-ray afterglow
  31. GRB 000210: BATSE Observations
  32. GRB000201 Optical Observations
  33. GRB 000201: TAROT optical observations
  34. BATSE GRB trigger criteria changed
  35. BATSE+IPN location of GRB000131
  36. BATSE location of GRB000126
  37. BATSE Observations of GRB000115
  38. Second RXTE Observation of GRB 000115
  39. Single IPN error box for GRB991229
  40. GRB 991216: Updated BATSE parameters
  41. GRB 991216--Summary of RXTE Observations
  42. GRB 991216: Extremely bright BATSE burst
  43. GRB991106: BeppoSAX/BATSE results
  44. BeppoSAX NFI Observation of GRB991106
  45. GRB 991105: BATSE Observations
  46. GRB991106, optical observation at SAO-RAS
  47. GRB 991106, LOTIS Optical Observations
  48. GRB991105: SAX-GRBM/-WFC detection
  49. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  50. GRB ALERT: GRB991105
  51. GRB 991014 - BeppoSAX NFI observations
  52. GRB991014 BATSE Observations
  53. Super-LOTIS optical observation of GRB991014
  54. BeppoSAX ALERT: GRB991014
  55. GRB 990915 optical observations
  56. BATSE GRB trigger criteria
  57. IPN error box for GRB990915 (=BATSE 7766)
  58. IPN localization of BATSE #7766 (GRB990915)
  59. GRB990806: BATSE Observations
  60. BeppoSAX ALERT GRB990806: Summer GRB
  61. BeppoSAX NFI Observation of GRB990705
  62. BeppoSAX NFI Observation of GRB990705
  63. GRB990704
  64. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  65. BeppoSAX: GRB990625
  66. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  67. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  68. BeppoSAX: A new fast X-ray transient
  69. GRB990510: X-ray afterglow
  70. GRB 990510: BATSE Observations
  71. GRB 990506: BATSE Observations
  72. GRB990323 PRECISE IPN POSITION
  73. GRB990316: simultaneous optical observation
  74. GRB990316 - Optical null results
  75. ASM/IPN error box for GRB 990308 (BATSE #7457)
  76. GRB 990308a and GRB 990308b
  77. BATSE Resumes Normal Operations
  78. Search for Potential Images of GRB 990123
  79. Search for Potential Images of GRB 990123
  80. GRB990123, OSSE observations
  81. GRB 990123: Strong MeV CGRO-COMPTEL detection now posted on WWW
  82. GRB 990123: BATSE Observations
  83. GRB990123, early optical counterpart detection
  84. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  85. Possible identification of SN1999E with GRB980910
  86. GRB 980923 BATSE Observations
  87. GRB980703 - BeppoSAX/GRBM detection
  88. GRB 980703: BATSE Observations
  89. RXTE Observation of GRB 980706
  90. GRB980703: LOTIS observation at early times
  91. GRB 980703: ASM Position & Intensity
  92. GRB 980613: BATSE Observations
  93. SGR1627-41, BeppoSAX-GRBM detections
  94. Discovery of a new SGR source, SGR1627-41
  95. BATSE on-board GRB trigger change
  96. GRB980519 BATSE Observations
  97. BATSE on-board GRB trigger change
  98. GRB980519, BeppoSAX-WFC updated position
  99. GRB980519, BeppoSAX-WFC position
  100. GRB980425 BATSE observations

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