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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"

15247 results found.

  1. GRB000528: follow-up X-ray measurements and update of IPN annulus
  2. Optical Follow-up of GRB000529 Error Box
  3. GRB000604 optical non-detection
  4. GRB000604, optical observations
  5. GRB000528, optical observations at ESO
  6. X-ray Afterglow of GRB 000529
  7. GRB000519: Optical observations
  8. GRB000528: BeppoSAX GRBM observations
  9. GRB 000528 Optical Observations
  10. Re: GRB000508B : Optical observations
  11. GRB 000424 Optical Observations
  12. The redshift of GRB 000418
  13. GRB000418, Radio detection
  14. GRB 000418, Optical Observation
  15. GRB000418, near-infrared observations
  16. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  17. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  18. GRB000408 [IPN Position]
  19. GRB000326 Optical Observations
  20. GRB000326, Further VLA observations
  21. GRB000313, Radio observations
  22. GRB 000301C: A Precise Redshift Determination
  23. GRB 000301C, Optical Observation
  24. GRB 000301C: HST/STIS CCD Imaging of the field
  25. GRB 000301c: K' observations
  26. GRB000301C, optical R-band observations
  27. GRB 000301C Optical Observations
  28. GRB 000301C: K' Observations
  29. GRB000301C - Host galaxy not detected in R (?)
  30. Optical observations of GRB000301c
  31. GRB000301C, Radio observations
  32. GRB000301C, Radio observations
  33. GRB000301C, near-infrared observations (JHK' imaging)
  34. GRB 000301c near-IR observations
  35. GRB000301C 250 GHz detection
  36. GRB 000301C R-band observation
  37. GRB000301C, near-infrared observations (JHK' photometry)
  38. GRB 000301A, Radio Observations
  39. GRB000301C, optical observations
  40. GRB000301c, near-infrared observations
  41. GRB000301C: RXTE/ASM and IPN localizations
  42. HST Observations of GRB 990712
  43. GRB000210, Radio Observations
  44. GRB000214: BeppoSAX GRBM and WFC Detection
  45. Optical observations of GRB000210
  46. GRB000210 X-ray afterglow
  47. Correction to Chandra Position of GRB000210 afterglow
  48. GRB000210: BeppoSAX GRBM and WFC Detection
  49. Optical observations of GRB000131
  50. GRB 000201: TAROT optical observations
  51. GRB 991208, radio observations
  52. BATSE Observations of GRB000115
  53. GRB 991216 VLBA Observations
  54. BEPPOSAX GRBM Localization of GRB991226
  55. GRB 991216: Detection of the Host and/or Absorber Galaxy
  56. GRB 991216: Updated BATSE parameters
  57. Lowell/Perkins observation of GRB 991216
  58. GRB 991217 (SAX J2303.2+0015) Optical observations
  59. GRB991217/SAX J2303.2+0015, optical observations
  60. Chandra observation of the X-ray afterglow of GRB991216
  61. GRB 991216 Optical spectroscopy/imaging
  62. GRB991216 Optical and IR observations
  63. SAX J2303.2+0015 Optical observations
  64. GRB991216 radio observations
  65. GRB 991217 (SAX J2303.2+0015) Optical observations
  66. GRB991216 radio observations
  67. GRB991216, optical observations
  68. GRB991216 Optical and infrared observations of Beethoven Burst
  69. Refined IPN localization of GRB991216
  70. GRB 991216 Radio Observations
  71. GRB 991208 Keck Spectroscopy
  72. GRB 991208 Infrared Detection
  73. GRB991216
  74. GRB 991216--Summary of RXTE Observations
  75. GRB 991216, optical observations
  76. SAX J2303.2+0015: an x-ray/GRB?
  77. GRB 991208 Keck Spectroscopy
  78. GRB991208 - millimeter detection
  79. GRB 991208 Optical Decay
  80. GRB 991208 optical observations
  81. GRB991106: BeppoSAX/BATSE results
  82. GRB 991106, optical observations
  83. GRB991106, near-infrared observations
  84. BeppoSAX NFI Observation of GRB991106
  85. GRB991106: the first BeppoSAX short GRB detection?
  86. GRB991105: SAX-GRBM/-WFC detection
  87. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  88. GRB 991014, Optical Observations
  89. GRB 991014 - BeppoSAX NFI observations
  90. GRB991014 BATSE Observations
  91. GRB 991014, optical observations
  92. IPN/NFI error box for GRB991014
  93. BATSE GRB trigger criteria
  94. IPN error box for GRB990915 (=BATSE 7766)
  95. GRB 990712 Late Optical Decay and Host Galaxy
  96. GRB 990806 Optical observations
  97. Optical Observations of GRB990806
  98. GRB 990712 Optical Observations
  99. BeppoSAX NFI Observation of GRB990705
  100. BeppoSAX NFI Observation of GRB990705

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