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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"

35264 results found.

  1. GRB000615, R-band photometry
  2. GRB980425, HST/STIS observations of the host galaxy
  3. GRB000615: BeppoSAX GRB Alert
  4. The Hosts of GRB 980703 and GRB 971214
  5. GRB 000301C: Further Late-Time HST/STIS observations
  6. GRB000528: follow-up X-ray measurements and update of IPN annulus
  7. GRB980519, HST/STIS observations of the host galaxy
  8. GRB000607, Radio Observations
  9. GRB000604 - Optical observations
  10. GRB000607, A SHORT, HARD BURST
  11. GRB000604, optical observations
  12. GRB000528, optical observations at ESO
  13. GRB 000604 optical observations
  14. GRB 000418: Detection of the Host Galaxy
  15. GRB000604, optical observations, comparison with DPOSS
  16. GRB000604 [IPN Position]
  17. X-ray Afterglow of GRB 000529
  18. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  19. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  20. IPN localization and time history of GRB000528
  21. New IPN localization of GRB000529
  22. GRB 000528 - WFC measurements
  23. GRB000528: BeppoSAX GRBM observations
  24. GRB 000528 Optical Observations
  25. GRB000519, BVRI field photometry
  26. IPN triangulation of GRB000519
  27. IPN triangulation of GRB000516
  28. Re: GRB000508B : Optical observations
  29. GRB 000418, Optical observation
  30. GRB000508B, optical photometry
  31. GRB000508B, BVR field photometry
  32. Possible GRB-related phenomenon
  33. RXTE/ASM and IPN localization of GRB 000508B
  34. GRB000424, UBVRI field photometry
  35. GRB 000424 Optical Observations
  36. GRB000418, UBVRI field photometry update
  37. The redshift of GRB 000418
  38. GRB 000429, optical observation
  39. GRB 000429, UBVRI field photometry
  40. IPN localization of GRB000429
  41. GRB 000418, UBVRI field photometry
  42. GRB000418, K'-band photometry
  43. GRB 000418, Optical Observation
  44. GRB 000418, optical observation
  45. GRB000424 Optical Observations
  46. GRB 000418, Optical Observation
  47. GRB 000424, Optical Observations
  48. GRB 000418, Optical Observation
  49. GRB000418, near-infrared observations
  50. Correction to IPN error box for GRB000419
  51. IPN error box for GRB000418
  52. GRB000419 [IPN Position]
  53. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  54. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  55. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  56. Budget cuts in BeppoSAX operations: impact on GRB observations
  57. GRB 000408, optical observations
  58. Refined IPN error box for GRB000408
  59. GRB 991208, UBVRI field photometry
  60. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  61. GRB000408 [IPN Position]
  62. GRB000326 Optical Observations
  63. GRB000301C - Addendum to GCN 623
  64. GRB000301C - R magnitude lower limit
  65. GRB 000323, optical observations
  66. GRB 000326: Optical Observations
  67. GRB000326, Radio observations
  68. GRB000326 [IPN Position]
  69. GRB 000307 optical observations
  70. GRB000323 [IPN Position]
  71. GRB000315 [IPN Positions]
  72. GRB 000313 - optical transient in the BATSE error box
  73. GRB000301C - B and R photometry
  74. GRB000301C - R photometry
  75. GRB 000307, Optical Observations
  76. GRB 000307, BVRI Field Photometry
  77. GRB 000301C: Optical Spectrum and Redshift
  78. GRB 000301C: Optical Spectrum and Redshift
  79. GRB 000301C: A Precise Redshift Determination
  80. GRB 000301C, Optical Observation
  81. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  82. GRB 000301C: HST/STIS CCD Imaging of the field
  83. IPN error box for GRB000307
  84. GRB 000301c: K' observations
  85. GRB000301C, optical R-band observations
  86. GRB000301c - R photometry and nearby faint source confirmation
  87. GRB 000301C, Optical Observation
  88. GRB 000301c: K' observations
  89. GRB 000301C Optical Observations
  90. GRB 000301C: K' Observations
  91. GRB000301C - Host galaxy not detected in R (?)
  92. GRB000301C optical observations
  93. GRB 000301c near-IR observations
  94. GRB 000301C, Optical Color
  95. GRB000301C, Optical Spectroscopy
  96. GRB 000301C, UBVRI field photometry
  97. GRB 000301C, Optical Observation
  98. GRB000301C 250 GHz detection
  99. GRB 000301C R-band observation
  100. GRB 000301C, Optical Observation

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