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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"

32510 results found.

  1. GRB030329: RTT150 optical observations and upper limit for a host
  2. GRB030501, optical observation
  3. GRB030501 observation report
  4. GRB030501 triangulation (correction to GCN 2194)
  5. GRB030329: RTT150 optical observations and upper limit for a host
  6. GRB 030429: Radio Observations
  7. GRB 030429: redshift from VLT spectroscopy
  8. GRB 030429: IR photometry with IRSF/SIRIUS
  9. GRB030501B triangulation (single error box)
  10. GRB 030329 Optical Observations
  11. GRB030328, optical observation
  12. GRB 030329, BVRI photometry
  13. GRB030429: Optical Observations
  14. GRB030501: TAROT candidate afterglow present in archival images
  15. GRB 030501: TAROT possible candidate counterpart
  16. IPN triangulation of GRB030501 (IBIS event; annulus)
  17. GRB 030429: confirmation of afterglow candidate
  18. GRB030425: CrAO optical observation
  19. GRB 030329 Oprical observations in Rozhen observatory
  20. GRB 030324: Radio Observations
  21. GRB030329 observed as a sudden ionospheric disturbance (SID)
  22. GRB030329, SPM optical observations
  23. GRB 030329, the review of the sky area in plate archive (1950-1998)
  24. GRB 030329: Spectral Evolution of SN 2003dh
  25. GRB 030329: optical spectropolarimetry at VLT
  26. GRB030329: optical polarization
  27. GRB030329, optical observation
  28. GRB030329: 444 AAVSO Measurements
  29. ROTSE-III prompt optical detections of GRB 030418
  30. GRB030418: Upper limits from recent and historical observations.
  31. GRB 030418: Optical afterglow
  32. GRB 030418: Finder for afterglow candidate
  33. GRB 030329 OT position
  34. GRB030329: Optical Observations
  35. OT GRB 030329: early UBVRcIc spectral evolution
  36. GRB030329, UBVRI polarimetry, R-polarization
  37. GRB 030329: SARA Optical Observations
  38. OT GRB 030329: early spectrum
  39. GRB030329: VR Photometry at TNG
  40. GRB030324: Candidate Optical Afterglow
  41. GRB 030413: Optical Observations
  42. GRB 030329 Rc observations
  43. Superluminal motion in GRB 030329 (Correction)
  44. Superluminal motion in GRB 030329
  45. GRB 030329 and SN 2003dh
  46. GRB030329, optical position
  47. GRB 030329 VLBA Observations
  48. GRB 030329: BVRI photometry at Asiago
  49. GRB 030329, light curve flattens
  50. GRB 030329: VLT V-band photometry
  51. If the SN/GRB connection confirmed
  52. GRB 030329: Supernova Confirmed
  53. GRB030329: RTT150 optical observations
  54. GRB030329: Near Infrared Observations at Gunma
  55. GRB030329: HET spectroscopic monitoring
  56. GRB 030329, color evolution
  57. GRB030328, UBVRcIc field photometry
  58. GRB030329: Optical observcations
  59. GRB030329: BV photographic observations
  60. GRB 030329 Optical observations
  61. GRB 030329, color evolution
  62. GRB 030329: possible color change
  63. GRB030329: RTT150 optical observations
  64. GRB 030329: Supernova Spectrum Emerging
  65. GRB030329: RTT150 optical observation
  66. GRB030329: More AAVSO VR obs
  67. GRB030328: R upper limit after 6 hours by MASTER
  68. GRB 030329: BV photographic observations
  69. GRB 030329: SARA Optical Observations
  70. GRB 030329: SARA Optical Observations
  71. GRB030329, fading resumes
  72. GRB 030329, BVRI photometry
  73. GRB030329: Optical observations
  74. SDSS 0.5m PT observations of GRB030329 (correction)
  75. SDSS 0.5m PT observations of GRB030329
  76. GRB 030329, Optical observations
  77. GRB 030329, nearby galaxies
  78. GRB030329, cessation of fading
  79. GRB030329: final R-band light curve by MASTER
  80. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  81. GRB 030329: Sub-millimeter detection
  82. GRB 030329: SARA Optical Observations
  83. GRB 030329: SARA Optical Observations
  84. OT GRB light curves and SN predictions
  85. GRB030329, optical observation
  86. GRB030329, optical observation
  87. GRB030329, new UBVRcIc field photometry
  88. GRB 030329, light curve and SN prediction
  89. GRB030329: optical observations at Tokyo Tech
  90. GRB 030329: optical observations
  91. GRB030329: multiple re-brightening phases
  92. GRB 030329, BRI photometry
  93. GRB030329: Optical observations at Teramo
  94. GRB030329: more 15GHz observations
  95. Further AAVSO V,B,R observations of GRB030329
  96. GRB 030329: Additional Mt. Laguna Optical Observations
  97. GRB 030329: SARA Optical Observations
  98. GRB 030329: Observations with ANDICAM
  99. GRB030329: Optical observations
  100. GRB 030329: Correction to GCN 2056

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