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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').
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.

Advanced Search Examples (click to copy):

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

36042 results found.

  1. IPN triangulation of GRB010629
  2. GRB010629: A Burst Localized by HETE
  3. Possible burst from SGR1806-20
  4. IPN detection of SGR1900+14
  5. GRB 00630: Host Galaxy
  6. IPN triangulation of GRB010613
  7. IPN triangulation of GRB010612
  8. HETE Fully-Automated GCN Notices
  9. GRB000301C: Late-time HST/STIS observation
  10. GRB010518: a faint BeppoSAX detection
  11. GRB000418: HST/STIS Second-epoch Observations
  12. GRB010427, Gamma Ray Observations
  13. SGR1900+14
  14. GRB 010222 /corrections to VBT data
  15. Possible precursor to the SGR1900+14 giant burst
  16. IPN Triangulation of the Giant Flare from SGR1900+14
  17. GRB010412, field photometry
  18. GRB 010326b Optical Observations
  19. GRB010412: Optical observations
  20. GRB010412: Optical observations
  21. IPN Triangulation of GRB010412
  22. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  23. BeppoSAX GRB ALERT: GRB010412
  24. GRB Observation Report
  25. GRB010324, revised field photometry
  26. REVISED LOCATION OF GRB010326A
  27. GRB 980326: Late-time HST/STIS observations
  28. GRB010324, field photometry
  29. GRB010326B, field photometry
  30. GRB010326, field photometry
  31. GRB010220, field photometry
  32. Further Optical Observations of GRB 010324
  33. GRB 010326A: Further optical observations
  34. GRB010324: BeppoSAX/GRBM data
  35. GRB 010326B: Optical observations
  36. GRB010324, optical observations
  37. GRB010326B: Localization by HETE (2nd GRB for this date)
  38. GRB 010326: Optical observations
  39. GRB 010326 optical observations
  40. GRB010326: Refined Localization by HETE
  41. GRB010326: Localization by HETE
  42. Duration, ECT, peak flux and fluence of GRB010324
  43. Optical Observations of GRB 010324
  44. IPN TRIANGULATION OF GRB010324
  45. GRB990705, VLT-FORS1 observations of the host galaxy
  46. GRB010222, late-time optical observation
  47. Support extension to the BeppoSAX mission
  48. GRB 010222 - HEGRA GeV/TeV Observations
  49. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  50. GRB010222: Chandra X-ray Observatory Observation
  51. GRB010222: Sub-millimeter vanishing act
  52. GRB 010222, Optical Observations
  53. GRB 010222: High-Resolution Keck Spectroscopy
  54. GRB 010214, I-band data
  55. Sub-millimeter Excess/GRB 010222
  56. GRB 010222
  57. GRB 010222 HST/Chandra TOO
  58. GRB 010222
  59. GRB010222 further R-band photometry
  60. GRB010222: R-band data
  61. GRB010222 Optical observations
  62. GRB 010222: Keck Spectroscopy
  63. GRB010214, field photometry
  64. GRB010222, field photometry
  65. GRB010222 further R-band photometry
  66. GRB010222, possible increase of optical decay slope
  67. GRB 010222 Kyoto optical observation
  68. GRB010222: fading behavior
  69. GRB 010222 BV optical observations
  70. GRB 010220: Near-IR Observations
  71. GRB010214 follow-up from Hanle
  72. GRB 010222: Near-IR Observations
  73. GRB 010222: Optical Observations
  74. GRB 010222, Decay Slope Confirmed
  75. GRB010222: Another absorption line system
  76. GRB010222: Optical decay slope
  77. GRB 010214, Optical Observations
  78. GRB010222: Sub-millimeter detection
  79. GRB010222: R-band fading behavior
  80. GRB010222: Optical Observations
  81. GRB010222, optical observations
  82. GRB010222: BeppoSAX/NFI Observations
  83. Redshift of the Optical Transient of GRB010222
  84. GRB010214B,Gamma Ray Observations
  85. GRB010222
  86. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  87. GRB 010220, simultaneous optical observations
  88. GRB010220: BeppoSAX WFC and GRBM preliminary data
  89. BeppoSAX ALERT: GRB010220
  90. GRB010214: BeppoSAX WFC and GRBM preliminary data
  91. GRB 010214: X-Ray afterglow
  92. GRB 010214, Optical Observations
  93. GRB 010214 optical observation
  94. GRB010213 Optical Observation
  95. J-Band Observation of GRB 010214.
  96. GRB010213, Near-IR observations
  97. Possible InfraRed Transient of GRB 010214.
  98. GRB010214 Optical Observation
  99. GRB010214: BeppoSAX/NFI Observations
  100. GRB010213 (HETE) TAROT observations

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