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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"

41667 results found.

  1. GRB981220 Optical Observations
  2. GRB 981220
  3. GRB 981220, optical observations
  4. GRB 980326/Host Galaxy
  5. GRB981220 IPN error box
  6. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  7. BeppoSAX NFI Observation of GRB980425
  8. GRB980329 R,I flux calibration and R,I,K upper limits
  9. GRB980425 Optical Follow-up
  10. GRB980425: X-ray revised positions
  11. GRB 980923 BATSE Observations
  12. SGR1900+14, BeppoSAX-GRBM observations
  13. GRB980703 Very Long Baseline Interferometry
  14. GRB970508 optical observations
  15. GRB971214, association with a Galactic star?
  16. Optical Observations of the Host Galaxy of GRB 980519
  17. GRB980519, Optical Observations
  18. GRB980703, Host galaxy multicolor photometry
  19. GRB980703 - BeppoSAX/GRBM detection
  20. GRB 980703 (NFI observations)
  21. GRB980703 optical photometry
  22. GRB 980703: BATSE Observations
  23. GRB980703 optical observations
  24. GRB980703: Radio transient
  25. GRB980703 H-band Observations
  26. GRB 980703: Spectrum of the proposed optical counterpart
  27. RXTE Observation of GRB 980706
  28. GRB980703: Spectrum of the proposed optical counterpart
  29. GRB980703 Transient Optical Follow-Up
  30. GRB980703: LOTIS observation at early times
  31. GRB980613 Optical Observations
  32. GRB 980703
  33. GRB980703 (I band observations)
  34. GRB 980703 H-band Observations
  35. GRB980703 (optical R observations)
  36. GRB980706
  37. GRB980703: radio source/optical transient
  38. BeppoSAX NFI observations of GRB 980703
  39. GRB 980703: ASM Position & Intensity
  40. GRB980703
  41. GRB980519 observation report
  42. GRB980703 optical followup
  43. SGR1627-41
  44. Radio observations of SGRs
  45. SGR1900+14 field optical observations
  46. GRB 980613 Near-IR observations
  47. GRB980613, optical observations
  48. GRB 980613: Optical transient and its host galaxy
  49. SGR1627-41, RXTE/ASM observations
  50. SGR1627-41, Refined IPN annulus location
  51. GRB 980613: Detection of the probable host galaxy
  52. Reduced error box of SGR 1627-41
  53. GRB 980613: BATSE Observations
  54. SGR1627-41, BeppoSAX-GRBM detections
  55. SGR 1627-41
  56. GRB 980613 Optical Observations
  57. GRB 980613 optical observations
  58. Discovery of a new SGR source, SGR1627-41
  59. GRB980613 Optical Observations
  60. GRB980613 observations from Palomar
  61. GRB980613 BeppoSAX-NFI follow up
  62. GRB 980613 new optical/IR observations
  63. GRB 980613 optical/IR obs.
  64. GRB980613 Near Infra-Red Observations
  65. GRB980611
  66. GRB980613, BeppoSAX WFC positions
  67. GRB971214 Secondary Standards
  68. SGR 1900+14
  69. GRB980519 Secondary Standards
  70. SGR1900+14
  71. SGR1900+14
  72. GRB 980519 Optical Observations
  73. GRB980519 optical observations
  74. GRB980519 I-band observations
  75. GRB 980519
  76. GRB980519 optical observations
  77. GRB 980519 Optical Observations
  78. GRB980519 BATSE Observations
  79. GRB970519, optical follow-up at Schmidt Calern
  80. GRB980519 optical observations
  81. GRB980519 Optical Observations
  82. GRB980519 Optical Observations
  83. GRB980519 IPN POSITION
  84. GRB980519 Optical Observations
  85. GRB 980519 Optical Observations
  86. GRB980519 optical observations
  87. GRB980515, BeppoSAX IAUC to be submitted
  88. BATSE on-board GRB trigger change
  89. GRB980519, BeppoSAX-WFC updated position
  90. GRB980519, BeppoSAX-WFC position
  91. GRB980515: SAX-WFC updated position
  92. BeppoSAX GRB ALERT: updated position of grb980515
  93. GRB 980425 Radio Light Curve
  94. GRB 980425 Brightness Temperature
  95. BSAX Observations of GRB980425 field
  96. GRB980425 BATSE observations
  97. SAX J0840.7+2248 Optical Observations
  98. GRB 980425 optical observations
  99. GRB980425: optical obs.
  100. GRB980425: Radio Observations

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