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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"

37523 results found.

  1. GRB980703 Very Long Baseline Interferometry
  2. GRB970508 optical observations
  3. GRB971214, association with a Galactic star?
  4. Optical Observations of the Host Galaxy of GRB 980519
  5. GRB980519, Optical Observations
  6. GRB980703, Host galaxy multicolor photometry
  7. GRB980703 - BeppoSAX/GRBM detection
  8. GRB 980703 (NFI observations)
  9. GRB980703 optical photometry
  10. GRB 980703: BATSE Observations
  11. GRB980703: Radio transient
  12. GRB980703 H-band Observations
  13. GRB 980703: Spectrum of the proposed optical counterpart
  14. RXTE Observation of GRB 980706
  15. GRB980703: Spectrum of the proposed optical counterpart
  16. GRB980703 Transient Optical Follow-Up
  17. GRB980703: LOTIS observation at early times
  18. GRB980613 Optical Observations
  19. GRB 980703
  20. GRB 980703 H-band Observations
  21. GRB980703 (optical R observations)
  22. GRB980706
  23. GRB980703: radio source/optical transient
  24. BeppoSAX NFI observations of GRB 980703
  25. GRB 980703: ASM Position & Intensity
  26. GRB980703
  27. GRB980703 optical followup
  28. GRB 980613 Near-IR observations
  29. GRB980613, optical observations
  30. GRB 980613: Optical transient and its host galaxy
  31. GRB 980613: Detection of the probable host galaxy
  32. GRB 980613: BATSE Observations
  33. GRB 980613 Optical Observations
  34. GRB 980613 optical observations
  35. GRB980613 Optical Observations
  36. GRB980613 observations from Palomar
  37. GRB980613 BeppoSAX-NFI follow up
  38. GRB 980613 new optical/IR observations
  39. GRB 980613 optical/IR obs.
  40. GRB980613 Near Infra-Red Observations
  41. GRB980611
  42. GRB980613, BeppoSAX WFC positions
  43. GRB971214 Secondary Standards
  44. GRB980519 Secondary Standards
  45. BATSE on-board GRB trigger change
  46. GRB 980519 Optical Observations
  47. GRB980519 optical observations
  48. GRB 980519
  49. GRB980519 optical observations
  50. GRB 980519 Optical Observations
  51. GRB980519 BATSE Observations
  52. GRB970519, optical follow-up at Schmidt Calern
  53. GRB980519 optical observations
  54. GRB980519 Optical Observations
  55. GRB980519 Optical Observations
  56. GRB980519 IPN POSITION
  57. GRB980519 Optical Observations
  58. GRB 980519 Optical Observations
  59. GRB980519 optical observations
  60. GRB980515, BeppoSAX IAUC to be submitted
  61. BATSE on-board GRB trigger change
  62. BeppoSAX GRB ALERT: updated position of grb980515
  63. GRB 980425 Radio Light Curve
  64. GRB 980425 Brightness Temperature
  65. GRB980425 BATSE observations
  66. SAX J0840.7+2248 Optical Observations
  67. GRB 980425 optical observations
  68. GRB980425: optical obs.
  69. GRB980425: Radio Observations
  70. GRB 980425 optical observations
  71. GRB 980425 optical observations
  72. GRB 980329 ROSAT observation
  73. GRB980326 X-ray Observations
  74. GRB980326, optical observations
  75. GRB980326, optical observations
  76. GRB980329, Fading IR counterpart to radio source
  77. GRByymmdd, Announcement of automation
  78. GRB980326 IPN annulus
  79. GRB980329 sub-millimeter observations
  80. GRB980329 IPN annulus
  81. GRB980329 near-IR observations
  82. GRB980326 optical observations
  83. GRB980329 optical observations
  84. GRB980329 VLA observations
  85. GRB980329 near IR observations
  86. GRB980329 optical observations
  87. GRB980329 optical observations
  88. GRB980326 optical observations
  89. GRB980326 optical observations
  90. GRB970508 SAO RAS optical observations
  91. Optical Observations of GRB 970508
  92. GRB 971214: Redshift from Keck Observations
  93. Near-IR follow-up on GRB 971227
  94. GRB971214: Keck R & I-band Observations
  95. GRB 971227: Optical Observations
  96. Optical Observations of the GRB 971227 field
  97. Optical Observations on GRB 971227
  98. GRB971227: Plaskett R-band observations
  99. GRB 971227: Optical clarifications
  100. Optical Observations for GRB 971227

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