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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"

35255 results found.

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

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