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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"

15251 results found.

  1. GRB 000615: NIR further observations
  2. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  3. The Hosts of GRB 980703 and GRB 971214
  4. GRB 000301C: Further Late-Time HST/STIS observations
  5. GRB000528: follow-up X-ray measurements and update of IPN annulus
  6. Optical Follow-up of GRB000529 Error Box
  7. GRB000604 optical non-detection
  8. GRB000604, optical observations
  9. GRB000528, optical observations at ESO
  10. X-ray Afterglow of GRB 000529
  11. GRB000519: Optical observations
  12. GRB000528: BeppoSAX GRBM observations
  13. GRB 000528 Optical Observations
  14. Re: GRB000508B : Optical observations
  15. GRB 000424 Optical Observations
  16. The redshift of GRB 000418
  17. GRB000418, Radio detection
  18. GRB 000418, Optical Observation
  19. GRB000418, near-infrared observations
  20. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  21. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  22. GRB000408 [IPN Position]
  23. GRB000326 Optical Observations
  24. GRB000326, Further VLA observations
  25. GRB000313, Radio observations
  26. GRB 000301C: A Precise Redshift Determination
  27. GRB 000301C, Optical Observation
  28. GRB 000301C: HST/STIS CCD Imaging of the field
  29. GRB 000301c: K' observations
  30. GRB000301C, optical R-band observations
  31. GRB 000301C Optical Observations
  32. GRB 000301C: K' Observations
  33. GRB000301C - Host galaxy not detected in R (?)
  34. Optical observations of GRB000301c
  35. GRB000301C, Radio observations
  36. GRB000301C, Radio observations
  37. GRB000301C, near-infrared observations (JHK' imaging)
  38. GRB 000301c near-IR observations
  39. GRB000301C 250 GHz detection
  40. GRB 000301C R-band observation
  41. GRB000301C, near-infrared observations (JHK' photometry)
  42. GRB 000301A, Radio Observations
  43. GRB000301C, optical observations
  44. GRB000301c, near-infrared observations
  45. GRB000301C: RXTE/ASM and IPN localizations
  46. HST Observations of GRB 990712
  47. GRB000210, Radio Observations
  48. GRB000214: BeppoSAX GRBM and WFC Detection
  49. Optical observations of GRB000210
  50. GRB000210 X-ray afterglow
  51. Correction to Chandra Position of GRB000210 afterglow
  52. GRB000210: BeppoSAX GRBM and WFC Detection
  53. Optical observations of GRB000131
  54. GRB 000201: TAROT optical observations
  55. GRB 991208, radio observations
  56. BATSE Observations of GRB000115
  57. GRB 991216 VLBA Observations
  58. BEPPOSAX GRBM Localization of GRB991226
  59. GRB 991216: Detection of the Host and/or Absorber Galaxy
  60. GRB 991216: Updated BATSE parameters
  61. Lowell/Perkins observation of GRB 991216
  62. GRB 991217 (SAX J2303.2+0015) Optical observations
  63. GRB991217/SAX J2303.2+0015, optical observations
  64. Chandra observation of the X-ray afterglow of GRB991216
  65. GRB 991216 Optical spectroscopy/imaging
  66. GRB991216 Optical and IR observations
  67. SAX J2303.2+0015 Optical observations
  68. GRB991216 radio observations
  69. GRB 991217 (SAX J2303.2+0015) Optical observations
  70. GRB991216 radio observations
  71. GRB991216, optical observations
  72. GRB991216 Optical and infrared observations of Beethoven Burst
  73. Refined IPN localization of GRB991216
  74. GRB 991216 Radio Observations
  75. GRB 991208 Keck Spectroscopy
  76. GRB 991208 Infrared Detection
  77. GRB991216
  78. GRB 991216--Summary of RXTE Observations
  79. GRB 991216, optical observations
  80. SAX J2303.2+0015: an x-ray/GRB?
  81. GRB 991208 Keck Spectroscopy
  82. GRB991208 - millimeter detection
  83. GRB 991208 Optical Decay
  84. GRB 991208 optical observations
  85. GRB991106: BeppoSAX/BATSE results
  86. GRB 991106, optical observations
  87. GRB991106, near-infrared observations
  88. BeppoSAX NFI Observation of GRB991106
  89. GRB991106: the first BeppoSAX short GRB detection?
  90. GRB991105: SAX-GRBM/-WFC detection
  91. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  92. GRB 991014, Optical Observations
  93. GRB 991014 - BeppoSAX NFI observations
  94. GRB991014 BATSE Observations
  95. GRB 991014, optical observations
  96. IPN/NFI error box for GRB991014
  97. BATSE GRB trigger criteria
  98. IPN error box for GRB990915 (=BATSE 7766)
  99. GRB 990712 Late Optical Decay and Host Galaxy
  100. GRB 990806 Optical observations

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