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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"

35431 results found.

  1. GRB 981220, optical observations
  2. GRB 980326/Host Galaxy
  3. GRB981220 IPN error box
  4. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  5. GRB980329 R,I flux calibration and R,I,K upper limits
  6. GRB980425: X-ray revised positions
  7. GRB 980923 BATSE Observations
  8. GRB980703 Very Long Baseline Interferometry
  9. GRB970508 optical observations
  10. GRB971214, association with a Galactic star?
  11. Optical Observations of the Host Galaxy of GRB 980519
  12. GRB980519, Optical Observations
  13. GRB980703, Host galaxy multicolor photometry
  14. GRB980703 - BeppoSAX/GRBM detection
  15. GRB 980703 (NFI observations)
  16. GRB980703 optical photometry
  17. GRB 980703: BATSE Observations
  18. GRB980703: Radio transient
  19. GRB980703 H-band Observations
  20. GRB 980703: Spectrum of the proposed optical counterpart
  21. RXTE Observation of GRB 980706
  22. GRB980703: Spectrum of the proposed optical counterpart
  23. GRB980703 Transient Optical Follow-Up
  24. GRB980703: LOTIS observation at early times
  25. GRB980613 Optical Observations
  26. GRB 980703
  27. GRB 980703 H-band Observations
  28. GRB980703 (optical R observations)
  29. GRB980706
  30. GRB980703: radio source/optical transient
  31. BeppoSAX NFI observations of GRB 980703
  32. GRB 980703: ASM Position & Intensity
  33. GRB980703
  34. GRB980703 optical followup
  35. GRB 980613 Near-IR observations
  36. GRB980613, optical observations
  37. GRB 980613: Optical transient and its host galaxy
  38. GRB 980613: Detection of the probable host galaxy
  39. GRB 980613: BATSE Observations
  40. GRB 980613 Optical Observations
  41. GRB 980613 optical observations
  42. GRB980613 Optical Observations
  43. GRB980613 observations from Palomar
  44. GRB980613 BeppoSAX-NFI follow up
  45. GRB 980613 new optical/IR observations
  46. GRB 980613 optical/IR obs.
  47. GRB980613 Near Infra-Red Observations
  48. GRB980611
  49. GRB980613, BeppoSAX WFC positions
  50. GRB971214 Secondary Standards
  51. GRB980519 Secondary Standards
  52. BATSE on-board GRB trigger change
  53. GRB 980519 Optical Observations
  54. GRB980519 optical observations
  55. GRB 980519
  56. GRB980519 optical observations
  57. GRB 980519 Optical Observations
  58. GRB980519 BATSE Observations
  59. GRB970519, optical follow-up at Schmidt Calern
  60. GRB980519 optical observations
  61. GRB980519 Optical Observations
  62. GRB980519 Optical Observations
  63. GRB980519 IPN POSITION
  64. GRB980519 Optical Observations
  65. GRB 980519 Optical Observations
  66. GRB980519 optical observations
  67. GRB980515, BeppoSAX IAUC to be submitted
  68. BATSE on-board GRB trigger change
  69. BeppoSAX GRB ALERT: updated position of grb980515
  70. GRB 980425 Radio Light Curve
  71. GRB 980425 Brightness Temperature
  72. IPN web site of GRBs
  73. GRB980425 BATSE observations
  74. SAX J0840.7+2248 Optical Observations
  75. GRB 980425 optical observations
  76. GRB980425: optical obs.
  77. GRB980425: Radio Observations
  78. GRB 980425 optical observations
  79. GRB 980425 optical observations
  80. GRB 980329 ROSAT observation
  81. GRB980326 X-ray Observations
  82. GRB980326, optical observations
  83. GRB980326, optical observations
  84. GRB980329, Fading IR counterpart to radio source
  85. GRByymmdd, Announcement of automation
  86. GRB980326 IPN annulus
  87. GRB980329 sub-millimeter observations
  88. GRB980329 IPN annulus
  89. GRB980329 near-IR observations
  90. GRB980326 optical observations
  91. GRB980329 optical observations
  92. GRB980329 VLA observations
  93. GRB980329 near IR observations
  94. GRB980329 optical observations
  95. GRB980329 optical observations
  96. GRB980326 optical observations
  97. GRB980326 optical observations
  98. GRB970508 SAO RAS optical observations
  99. Optical Observations of GRB 970508
  100. GRB 971214: Redshift from Keck Observations

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