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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"

36947 results found.

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

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