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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"

15247 results found.

  1. Konus-Wind detection of the bursts from SGR1806-20 region
  2. RXTE PCA Observations of SGR1806-20 Region
  3. GRB030329: RTT150 optical observations
  4. GRBlog: Compilation of all GCN Circ. data
  5. GRB030329, optical observation in May
  6. GRB030329: second XMM-Newton observation
  7. GRB030418: R optical observations
  8. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  9. GRB 030528: Optical Observations
  10. GRB030329, further radio observations at GMRT
  11. GRB030528: Chandra TOO Planned
  12. MASTER: optical observation GRB030601
  13. GRB030528(=H2724): Revised SXC Localization
  14. GRB030528 (H2724): A long GRB localized by HETE
  15. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  16. GRB 030418: Second Epoch Optical Observations with Magellan
  17. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  18. GRB 030501: final TAROT limits
  19. GRB030329, BVRI photometry
  20. GRB030429, refiend optical brightness
  21. GRB030429, BVRcIc field photometry
  22. GRB 030329: High-Resolution Spectroscopy of the Host
  23. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  24. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  25. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  26. GRB030501 triangulation (correction to GCN 2194)
  27. GRB 030429: IR photometry with IRSF/SIRIUS
  28. GRB030328, optical observation
  29. GRB 030329, BVRI photometry
  30. GRB030501: TAROT candidate afterglow present in archival images
  31. GRB 030501: TAROT possible candidate counterpart
  32. GRB030425: CrAO optical observation
  33. GRB030329 observed as a sudden ionospheric disturbance (SID)
  34. Optical Observations of GRB 030418 with Magellan
  35. GRB030329, optical observation
  36. MASTER:optical observations probable GRB030414
  37. GRB030329: 444 AAVSO Measurements
  38. ROTSE-III prompt optical detections of GRB 030418
  39. GRB030418: Kiso near infrared observations
  40. GRB030329, UBVRI polarimetry, R-polarization
  41. GRB 030329 VLBA Observations
  42. GRB 030329, light curve flattens
  43. If the SN/GRB connection confirmed
  44. GRB 030329: Supernova Confirmed
  45. GRB030329: HET spectroscopic monitoring
  46. GRB 030329, color evolution
  47. GRB 030329, color evolution
  48. GRB030329: Kiso B and R band observations
  49. GRB030329: More AAVSO VR obs
  50. GRB030329, fading resumes
  51. GRB 030329, BVRI photometry
  52. GRB030329, optical observation
  53. GRB030329, new UBVRcIc field photometry
  54. GRB 030329, light curve and SN prediction
  55. GRB030329: multiple re-brightening phases
  56. GRB 030329, BRI photometry
  57. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  58. GRB 030329: Additional Mt. Laguna Optical Observations
  59. GRB 030329: Observations with ANDICAM
  60. GRB 030329: fitting parameters and re-brightening
  61. GRB030329 Further RBO Optical Observations
  62. triangulation of GRB 030331 (single error box)
  63. GRB 030329, R-band light curve
  64. GRB 030329 RBO V Optical Observations
  65. GRB 030329, optical photometry
  66. INTEGRAL GRB 030331
  67. GRB030329: R band light curve by MASTER
  68. GRB030329 - Light curve flattening
  69. GRB 030329: SARA Optical Observations
  70. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  71. GRB 030329: Light curve observed during the change of its slope.
  72. Redshift of GRB 030329
  73. GRB030329: ROTSE network observes steepening of decay curve
  74. GRB 030329: Optical decay and synthesis
  75. GRB 030329: Optical pre-Imaging
  76. GRB 030329: visual observations
  77. GRB030328: R optical observation
  78. GRB030328: X-ray Afterglow Observed with Chandra
  79. GRB 030329, R-band observations, supplement
  80. GRB 030329: optical observations
  81. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  82. GRB 030329: Optical Afterglow Observations
  83. GRB 030328 Optical Observations
  84. GRB030328: Decay index
  85. GRB 030328: Optical observations
  86. GRB 030328: optical observations
  87. GRB 030329: Optical afterglow fading
  88. GRB030328: optical spectroscopy at TNG
  89. GRB030328: optical photometry at the TNG
  90. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  91. GRB030323 optical observations
  92. GRB 030323: SARA Optical Observations
  93. GRB030323: V, R, I photometry
  94. GRB030324, Optical Observations
  95. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  96. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  97. GRB030323, ROTSE-III detection of possible optical counterpart
  98. GRB030323, optical observations
  99. GRB 030320: Optical Observations
  100. IPN upper limit to a GRB associated with SN2003L

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