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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"

35949 results found.

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

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