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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"

23631 results found.

  1. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  2. GRB000616 [IPN Position]
  3. GRB 000615: NIR observations
  4. GRB980425, HST/STIS observations of the host galaxy
  5. The Hosts of GRB 980703 and GRB 971214
  6. GRB 000301C: Further Late-Time HST/STIS observations
  7. GRB000528: follow-up X-ray measurements and update of IPN annulus
  8. GRB000607, Radio Observations
  9. GRB000607, A SHORT, HARD BURST
  10. IPN localization and time history of GRB000528
  11. New IPN localization of GRB000529
  12. IPN localization of GRB000529
  13. GRB000528: BeppoSAX GRBM observations
  14. Possible GRB-related phenomenon
  15. RXTE/ASM and IPN localization of GRB 000508B
  16. GRB 000424 Optical Observations
  17. IPN localization of GRB000429
  18. GRB 000418, optical observation
  19. GRB000424 Optical Observations
  20. GRB000424, optical observations
  21. GRB 000424, Optical Observations
  22. Correction to IPN error box for GRB000419
  23. GRB000416 Optical Observations
  24. GRB000416 BRJK observations
  25. GRB000301c results
  26. GRB000408, lotis optical observations
  27. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  28. GRB000408 [IPN Position]
  29. GRB000301C - R magnitude lower limit
  30. GRB 000313 - optical transient in the BATSE error box
  31. GRB 000301C: Optical Spectrum and Redshift
  32. GRB 000301C: Optical Spectrum and Redshift
  33. GRB 000301C: HST/STIS CCD Imaging of the field
  34. GRB 000301C, Optical Observation
  35. GRB 000301c: K' observations
  36. GRB 000301C: K' Observations
  37. GRB000301C - Host galaxy not detected in R (?)
  38. GRB000301C, near-infrared observations (JHK' imaging)
  39. GRB 000301c near-IR observations
  40. GRB 000301C, Optical Color
  41. GRB000301C 250 GHz detection
  42. GRB000301C, optical observations
  43. GRB000301C
  44. GRB000301C: RXTE/ASM and IPN localizations
  45. GRB000301A [IPN Position]
  46. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  47. GRB000210 X-ray afterglow
  48. BeppoSAX GRB000214 ("S. Valentine's day GRB")
  49. GRB 000210: BATSE Observations
  50. Optical candidate for GRB000210
  51. SAX_WFC_GRB_NOTICE
  52. SAX_WFC_GRB_NOTICE
  53. GRB000201 Optical Observations
  54. BATSE+IPN location of GRB000131
  55. IPN localization of GRB000131
  56. GRB 000126, optical observations
  57. BATSE location of GRB000126
  58. IPN localization of GRB000126
  59. BATSE Observations of GRB000115
  60. Second RXTE Observation of GRB 000115
  61. GRB991216 late optical observation
  62. Single IPN error box for GRB991229
  63. GCN resumes full operations
  64. BEPPOSAX GRBM Localization of GRB991226
  65. GRB 991216: J band spectrophotometry
  66. IPN localization of GRB991226
  67. GRB 991216: Updated BATSE parameters
  68. GRB991217/SAX J2303.2+0015, optical observations
  69. GRB 991216, optical observations
  70. GRB991216 Optical and infrared observations of Beethoven Burst
  71. Refined IPN localization of GRB991216
  72. GRB 991216--Summary of RXTE Observations
  73. SAX J2303.2+0015: an x-ray/GRB?
  74. GRB991216 ('Beethoven Burst') B, R, and K Observations
  75. GRB991216, infrared observations
  76. GRB991216 Optical Observations
  77. GRB 991216 Optical Observation
  78. R-band Observations of GRB991208 at TNG
  79. GRB 991208: Radio Observations
  80. IPN localization of GRB991208
  81. BeppoSAX NFI Observation of GRB991106
  82. IPN localization of GRB991105
  83. GRB 991106, LOTIS Optical Observations
  84. GRB 991014 - BeppoSAX NFI observations
  85. GRB 991014, Optical Observations
  86. GRB991014 BATSE Observations
  87. Super-LOTIS optical observation of GRB991014
  88. IPN localization of GRB991014 - CORRECTION
  89. IPN localization of GRB991014
  90. IPN localization of BATSE #7766 (GRB990915)
  91. GRB990907: BeppoSAX follow up and X-ray afterglow
  92. IPN localization of GRB990907
  93. GRB 990712 Late Optical Decay and Host Galaxy
  94. GRB 990712, Optical Observation
  95. GRB990806: BATSE Observations
  96. GRB 990806 Optical observations
  97. GRB 990806, optical observations
  98. GRB990806 UBVRIJHK observations
  99. GRB990705: No Evidence for Neutrino Signal
  100. GRB 990712

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