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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"

35152 results found.

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

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