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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"

36135 results found.

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

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