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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"

36128 results found.

  1. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  2. GRB980329 R,I flux calibration and R,I,K upper limits
  3. GRB980425: X-ray revised positions
  4. GRB 980923 BATSE Observations
  5. GRB980703 Very Long Baseline Interferometry
  6. GRB970508 optical observations
  7. GRB971214, association with a Galactic star?
  8. Optical Observations of the Host Galaxy of GRB 980519
  9. GRB980519, Optical Observations
  10. GRB980703, Host galaxy multicolor photometry
  11. GRB980703 - BeppoSAX/GRBM detection
  12. GRB 980703 (NFI observations)
  13. GRB980703 optical photometry
  14. GRB 980703: BATSE Observations
  15. GRB980703: Radio transient
  16. GRB980703 H-band Observations
  17. GRB 980703: Spectrum of the proposed optical counterpart
  18. RXTE Observation of GRB 980706
  19. GRB980703: Spectrum of the proposed optical counterpart
  20. GRB980703 Transient Optical Follow-Up
  21. GRB980703: LOTIS observation at early times
  22. GRB980613 Optical Observations
  23. GRB 980703
  24. GRB 980703 H-band Observations
  25. GRB980703 (optical R observations)
  26. GRB980706
  27. GRB980703: radio source/optical transient
  28. BeppoSAX NFI observations of GRB 980703
  29. GRB 980703: ASM Position & Intensity
  30. GRB980703
  31. GRB980703 optical followup
  32. GRB 980613 Near-IR observations
  33. GRB980613, optical observations
  34. GRB 980613: Optical transient and its host galaxy
  35. GRB 980613: Detection of the probable host galaxy
  36. GRB 980613: BATSE Observations
  37. GRB 980613 Optical Observations
  38. GRB 980613 optical observations
  39. GRB980613 Optical Observations
  40. GRB980613 observations from Palomar
  41. GRB980613 BeppoSAX-NFI follow up
  42. GRB 980613 new optical/IR observations
  43. GRB 980613 optical/IR obs.
  44. GRB980613 Near Infra-Red Observations
  45. GRB980611
  46. GRB980613, BeppoSAX WFC positions
  47. GRB971214 Secondary Standards
  48. GRB980519 Secondary Standards
  49. BATSE on-board GRB trigger change
  50. GRB 980519 Optical Observations
  51. GRB980519 optical observations
  52. GRB 980519
  53. GRB980519 optical observations
  54. GRB 980519 Optical Observations
  55. GRB980519 BATSE Observations
  56. GRB970519, optical follow-up at Schmidt Calern
  57. GRB980519 optical observations
  58. GRB980519 Optical Observations
  59. GRB980519 Optical Observations
  60. GRB980519 IPN POSITION
  61. GRB980519 Optical Observations
  62. GRB 980519 Optical Observations
  63. GRB980519 optical observations
  64. GRB980515, BeppoSAX IAUC to be submitted
  65. BATSE on-board GRB trigger change
  66. BeppoSAX GRB ALERT: updated position of grb980515
  67. GRB 980425 Radio Light Curve
  68. GRB 980425 Brightness Temperature
  69. IPN web site of GRBs
  70. GRB980425 BATSE observations
  71. SAX J0840.7+2248 Optical Observations
  72. GRB 980425 optical observations
  73. GRB980425: optical obs.
  74. GRB980425: Radio Observations
  75. GRB 980425 optical observations
  76. GRB 980425 optical observations
  77. GRB 980329 ROSAT observation
  78. GRB980326 X-ray Observations
  79. GRB980326, optical observations
  80. GRB980326, optical observations
  81. GRB980329, Fading IR counterpart to radio source
  82. GRByymmdd, Announcement of automation
  83. GRB980326 IPN annulus
  84. GRB980329 sub-millimeter observations
  85. GRB980329 IPN annulus
  86. GRB980329 near-IR observations
  87. GRB980326 optical observations
  88. GRB980329 optical observations
  89. GRB980329 VLA observations
  90. GRB980329 near IR observations
  91. GRB980329 optical observations
  92. GRB980329 optical observations
  93. GRB980326 optical observations
  94. GRB980326 optical observations
  95. GRB970508 SAO RAS optical observations
  96. Optical Observations of GRB 970508
  97. GRB 971214: Redshift from Keck Observations
  98. Near-IR follow-up on GRB 971227
  99. GRB971214: Keck R & I-band Observations
  100. GRB 971227: Optical Observations

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