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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"

21797 results found.

  1. MASTER:optical observations probable GRB030414
  2. GRB030329: 444 AAVSO Measurements
  3. MASTER:optical observations GRB030416
  4. ROTSE-III prompt optical detections of GRB 030418
  5. GRB030418: Upper limits from recent and historical observations.
  6. GRB030418: Kiso near infrared observations
  7. GRB 030418: Optical afterglow
  8. GRB 030418: Optical afterglow candidate
  9. GRB030329: Optical Observations
  10. OT GRB 030329: early UBVRcIc spectral evolution
  11. GRB030329, UBVRI polarimetry, R-polarization
  12. GRB 030329: SARA Optical Observations
  13. OT GRB 030329: early spectrum
  14. GRB030329: VR Photometry at TNG
  15. GRB030324: Candidate Optical Afterglow
  16. GRB 030413: Optical Observations
  17. GRB 030329 Rc observations
  18. GRB 030329 VLBA Observations
  19. GRB 030329: VLT V-band photometry
  20. GRB030329: RTT150 optical observations
  21. GRB030329: Near Infrared Observations at Gunma
  22. GRB030329: HET spectroscopic monitoring
  23. Kiso observation of the GRB030329 at April 6
  24. GRB030329: Optical observcations
  25. GRB030329: BV photographic observations
  26. GRB 030329 Optical observations
  27. GRB 030329, color evolution
  28. GRB030329: RTT150 optical observations
  29. GRB 030329: Supernova Spectrum Emerging
  30. GRB030329: Kiso B and R band observations
  31. GRB030329: RTT150 optical observation
  32. GRB030329: More AAVSO VR obs
  33. GRB030328: R upper limit after 6 hours by MASTER
  34. GRB 030329: BV photographic observations
  35. GRB 030329: SARA Optical Observations
  36. GRB 030329: SARA Optical Observations
  37. GRB030329: Optical observations
  38. SDSS 0.5m PT observations of GRB030329 (correction)
  39. SDSS 0.5m PT observations of GRB030329
  40. GRB 030329, Optical observations
  41. GRB 030329, nearby galaxies
  42. GRB030329: final R-band light curve by MASTER
  43. GRB030329 - more 15 GHz radio data
  44. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  45. GRB 030329: Sub-millimeter detection
  46. GRB 030329: SARA Optical Observations
  47. GRB 030329: SARA Optical Observations
  48. GRB 030329, light curve and SN prediction
  49. GRB030329: optical observations at Tokyo Tech
  50. GRB 030329: optical observations
  51. GRB 030329, BRI photometry
  52. GRB 030329 , SPM optical observations
  53. GRB030329: Optical observations at Teramo
  54. GRB 030329: Radio observations at GMRT
  55. GRB030329: more 15GHz observations
  56. Further AAVSO V,B,R observations of GRB030329
  57. GRB 030329: Additional Mt. Laguna Optical Observations
  58. GRB 030329: SARA Optical Observations
  59. GRB 030329: Observations with ANDICAM
  60. GRB030329: Optical observations
  61. GRB030329: further optical photometry and evidence for a light curve discontinuity
  62. GRB 030329: Correction to GCN 2056
  63. GRB 030329: KAIT optical photometry
  64. GRB030329 Further RBO Optical Observations
  65. GRB 030329: SARA Optical Observations
  66. AAVSO V & R observations of GRB030329
  67. GRB 030329: optical observations
  68. GRB 030329: beginning of the new fading phase in optical band
  69. GRB 030329, optical spectroscopy
  70. GRB 030329: optical photometry
  71. GRB030329: Optical observations
  72. Photometry of GRB030329 - Constant OT Magnitude
  73. GRB 030329, R-band observations
  74. GRB 030329, R-band light curve
  75. GRB 030329: further optical observations
  76. GRB030329 - OT brightens
  77. GRB 030329: OT observations at Kanazawa
  78. GRB 030329 RBO V Optical Observations
  79. GRB 030329, optical photometry
  80. GRB030329: Near Infrared Observations
  81. GRB 030324: Optical and NIR Observations
  82. GRB030329: R band light curve by MASTER
  83. GRB030329 - Light curve flattening
  84. GRB 030329: SARA Optical Observations
  85. GRB030329: R and B observations
  86. GRB 030329, optical observations
  87. GRB030329: Optical observations
  88. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  89. GRB 030329: Light curve observed during the change of its slope.
  90. GRB030329, SPM optical observations
  91. GRB030329: ROTSE network observes steepening of decay curve
  92. GRB 030329: Optical decay and synthesis
  93. GRB030329 optical observations
  94. GRB030329: optical spectroscopy with the TNG
  95. GRB 030329: Radio Observations
  96. GRB 030329, optical spectroscopy
  97. GRB 030329: Optical pre-Imaging
  98. GRB 030329: visual observations
  99. GRB 030329: Upper limit from 5.6 hours before trigger
  100. GRB030328: X-ray Afterglow Observed with Chandra

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