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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"

36140 results found.

  1. GRB 981226 optical observations
  2. GRB 981220
  3. GRB 981220, radio observations
  4. GRB981226 Optical Observation
  5. GRB 981220, radio observations
  6. GRB 981220: BeppoSAX/GRBM results
  7. GRB981220 I-band Observations
  8. GRB 981220
  9. GRB 981220 Optical Observations
  10. GRB 981220, optical observations
  11. GRB 980326/Host Galaxy
  12. GRB981220 IPN error box
  13. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  14. GRB980329 R,I flux calibration and R,I,K upper limits
  15. GRB980425: X-ray revised positions
  16. GRB 980923 BATSE Observations
  17. GRB980703 Very Long Baseline Interferometry
  18. GRB970508 optical observations
  19. GRB971214, association with a Galactic star?
  20. Optical Observations of the Host Galaxy of GRB 980519
  21. GRB980519, Optical Observations
  22. GRB980703, Host galaxy multicolor photometry
  23. GRB980703 - BeppoSAX/GRBM detection
  24. GRB 980703 (NFI observations)
  25. GRB980703 optical photometry
  26. GRB 980703: BATSE Observations
  27. GRB980703: Radio transient
  28. GRB980703 H-band Observations
  29. GRB 980703: Spectrum of the proposed optical counterpart
  30. RXTE Observation of GRB 980706
  31. GRB980703: Spectrum of the proposed optical counterpart
  32. GRB980703 Transient Optical Follow-Up
  33. GRB980703: LOTIS observation at early times
  34. GRB980613 Optical Observations
  35. GRB 980703
  36. GRB 980703 H-band Observations
  37. GRB980703 (optical R observations)
  38. GRB980706
  39. GRB980703: radio source/optical transient
  40. BeppoSAX NFI observations of GRB 980703
  41. GRB 980703: ASM Position & Intensity
  42. GRB980703
  43. GRB980703 optical followup
  44. GRB 980613 Near-IR observations
  45. GRB980613, optical observations
  46. GRB 980613: Optical transient and its host galaxy
  47. GRB 980613: Detection of the probable host galaxy
  48. GRB 980613: BATSE Observations
  49. GRB 980613 Optical Observations
  50. GRB 980613 optical observations
  51. GRB980613 Optical Observations
  52. GRB980613 observations from Palomar
  53. GRB980613 BeppoSAX-NFI follow up
  54. GRB 980613 new optical/IR observations
  55. GRB 980613 optical/IR obs.
  56. GRB980613 Near Infra-Red Observations
  57. GRB980611
  58. GRB980613, BeppoSAX WFC positions
  59. GRB971214 Secondary Standards
  60. GRB980519 Secondary Standards
  61. BATSE on-board GRB trigger change
  62. GRB 980519 Optical Observations
  63. GRB980519 optical observations
  64. GRB 980519
  65. GRB980519 optical observations
  66. GRB 980519 Optical Observations
  67. GRB980519 BATSE Observations
  68. GRB970519, optical follow-up at Schmidt Calern
  69. GRB980519 optical observations
  70. GRB980519 Optical Observations
  71. GRB980519 Optical Observations
  72. GRB980519 IPN POSITION
  73. GRB980519 Optical Observations
  74. GRB 980519 Optical Observations
  75. GRB980519 optical observations
  76. GRB980515, BeppoSAX IAUC to be submitted
  77. BATSE on-board GRB trigger change
  78. BeppoSAX GRB ALERT: updated position of grb980515
  79. GRB 980425 Radio Light Curve
  80. GRB 980425 Brightness Temperature
  81. IPN web site of GRBs
  82. GRB980425 BATSE observations
  83. SAX J0840.7+2248 Optical Observations
  84. GRB 980425 optical observations
  85. GRB980425: optical obs.
  86. GRB980425: Radio Observations
  87. GRB 980425 optical observations
  88. GRB 980425 optical observations
  89. GRB 980329 ROSAT observation
  90. GRB980326 X-ray Observations
  91. GRB980326, optical observations
  92. GRB980326, optical observations
  93. GRB980329, Fading IR counterpart to radio source
  94. GRByymmdd, Announcement of automation
  95. GRB980326 IPN annulus
  96. GRB980329 sub-millimeter observations
  97. GRB980329 IPN annulus
  98. GRB980329 near-IR observations
  99. GRB980326 optical observations
  100. GRB980329 optical observations

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