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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"

35941 results found.

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

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