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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"

38259 results found.

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

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