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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"

27392 results found.

  1. GRB000630: Optical observations
  2. GRB000630, Radio Observations
  3. possible optical counterpart of GRB 000630
  4. GRB 000620, optical observations
  5. GRB000418, HST/STIS Observations
  6. GRB990123: Late-time HST/STIS observations of the host
  7. GRB000620, optical observations
  8. GRB000615: H-band observations
  9. GRB990308, HST/STIS observations of the host galaxy
  10. GRB000620 - Optical observations
  11. GRB000620 Optical observations
  12. GRB000620: BeppoSAX WFC and GRBM detection
  13. GRB000607, optical observations
  14. GRB 000615: NIR further observations
  15. GRB990123, HST/STIS observations of the host galaxy
  16. GRB000616 optical observations
  17. GRB 000615, near-infrared observations
  18. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  19. GRB000615, further R-band photometry
  20. GRB 000615: NIR observations
  21. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  22. GRB000615, R-band photometry
  23. The Hosts of GRB 980703 and GRB 971214
  24. GRB 000301C: Further Late-Time HST/STIS observations
  25. GRB000528: follow-up X-ray measurements and update of IPN annulus
  26. GRB980519, HST/STIS observations of the host galaxy
  27. GRB000604 optical non-detection
  28. GRB000604 - Optical observations
  29. GRB000604, optical observations
  30. GRB000528, optical observations at ESO
  31. GRB 000604 optical observations
  32. GRB 000418: Detection of the Host Galaxy
  33. GRB000604, optical observations, comparison with DPOSS
  34. GRB000528, Radio Observations
  35. X-ray Afterglow of GRB 000529
  36. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  37. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  38. GRB 000528 - WFC measurements
  39. GRB000519, BVRI field photometry
  40. IPN triangulation of GRB000519
  41. GRB000508B, optical photometry
  42. GRB000508B, BVR field photometry
  43. Possible GRB-related phenomenon
  44. RXTE/ASM and IPN localization of GRB 000508B
  45. GRB000424, UBVRI field photometry
  46. GRB000418, UBVRI field photometry update
  47. GRB000424, optical observations
  48. GRB 000429, optical observation
  49. GRB 000429, UBVRI field photometry
  50. GRB 000418, UBVRI field photometry
  51. GRB 000418, optical observation
  52. GRB 000418, Optical Observation
  53. GRB000418, near-infrared observations
  54. Correction to IPN error box for GRB000419
  55. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  56. GRB000416 BRJK observations
  57. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  58. GRB 000408, optical observations
  59. GRB 991208, UBVRI field photometry
  60. GRB000408, lotis optical observations
  61. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  62. GRB000301C - Addendum to GCN 623
  63. GRB 000323, optical observations
  64. GRB 000326: Optical Observations
  65. GRB000326, Radio observations
  66. GRB000313, Radio observations
  67. GRB 000313 - optical transient in the BATSE error box
  68. GRB 000307, Optical Observations
  69. GRB 000307, BVRI Field Photometry
  70. GRB 000301C: A Precise Redshift Determination
  71. GRB 000301C, Optical Observation
  72. GRB 000301C: HST/STIS CCD Imaging of the field
  73. IPN error box for GRB000307
  74. GRB000301C, optical R-band observations
  75. GRB 000301C Optical Observations
  76. GRB 000301C: K' Observations
  77. GRB000301C OT candidate optical observations
  78. GRB000301C - Host galaxy not detected in R (?)
  79. Optical observations of GRB000301c
  80. GRB000301C, Radio observations
  81. GRB000301C, Radio observations
  82. GRB000301C, near-infrared observations (JHK' imaging)
  83. GRB 000301c near-IR observations
  84. GRB 000301C, UBVRI field photometry
  85. GRB 000301C: OT confirmed
  86. GRB000301c optical observations
  87. GRB000301C, optical observations
  88. GRB000301C
  89. GRB 000301C : Optical Candidate
  90. GRB000301C: RXTE/ASM and IPN localizations
  91. GRB000226 [IPN Position]
  92. HST Observations of GRB 990712
  93. GRB 000214 near-IR observations
  94. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  95. GRB000210, Radio Observations
  96. GRB 000115, BVRI field photometry
  97. GRB000214: BeppoSAX GRBM and WFC Detection
  98. Optical observations of GRB000210
  99. GRB000210 X-ray afterglow
  100. GRB000214: X-ray afterglow candidate

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