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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"

36143 results found.

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

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