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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"

5531 results found.

  1. GRB040916 optical limits 17 min after GRB
  2. GRB040916: Optical observations
  3. GRB/XRF040912,optical observations
  4. An intense burst from SGR1806-20
  5. IBAS GRB Alerts 1978-1980
  6. GRB040903 - A XRF?
  7. MASTER: GRB040827 possible OT
  8. GRB 040827 : Planned XMM-Newton observation
  9. GRB 040827 - A long GRB detected by INTEGRAL
  10. XRF040701: VLA Observations
  11. GRB040709 J,H-band observations
  12. IPN Summary of SGR1806-20 Activity in 2004
  13. GRB 040423 (=H3175): A Long GRB Localized by HETE
  14. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  15. GRB031220: Palomar Observations
  16. GRB 031220 : Kyoto Optical Observation
  17. GRB 031220: Optical observation at Tokyo Tech
  18. GRB 031203: Discovery of a dust echo
  19. GRB031203: K' Photometry of the likely GRB host
  20. IPN triangulation of GRB031111 (=H2924): small error box
  21. Lulin optical follow-up observations of GRB031026
  22. GRB 031026: Ic Observations
  23. IPN triangulation of GRB030919 (large error box)
  24. GRB030913: AAVSO optical observations
  25. 030813 SGR event (Konus-Wind observation)
  26. SGR 1808-20 (=H2802): A Possible new SGR
  27. XRF030723(=H2777): Chandra Observations
  28. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  29. GRB 021206, Radio afterglow candidate
  30. GRB030329, Optical observations
  31. GRB 021004: HST observations
  32. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  33. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  34. GRB030329: 444 AAVSO Measurements
  35. IPN triangulation of GRB050403 (small error box)
  36. GRB030329: RTT150 optical observations
  37. GRB030329: More AAVSO VR obs
  38. GRB 030329, BVRI photometry
  39. GRB030329: final R-band light curve by MASTER
  40. GRB 030329, BRI photometry
  41. GRB 030329: Additional Mt. Laguna Optical Observations
  42. GRB 030329: optical observations
  43. GRB 030329: OT candidate
  44. GRB030323: V, R, I photometry
  45. GRB 030227: Optical limit at RIKEN
  46. GRB 030227: Kyoto optical observation
  47. Possible GRB 20030109 seen by SPI ACS
  48. GRB021211: APO optical observations
  49. GRB021211: Optical observations
  50. GRB021113 (=H2449): A Long GRB Localized by HETE
  51. GRB021104: Optical observations
  52. GRB021104: optical observations
  53. GRB021104: possible optical afterglow
  54. IPN triangulation of GRB021023 (small error boc)
  55. GRB021016(=H2397): A Long GRB Localized by HETE
  56. GRB021004: Optical Observations
  57. GRB021004: Optical Observations
  58. GRB021004: BVRc photometry
  59. GRB021004: not fading anymore?
  60. GRB 021004: Optical Photometry at 2.5 Days
  61. GRB 021004: Optical observations at RIKEN
  62. GRB 021004: Optical Observations
  63. GRB 021004, optical observations
  64. GRB 021004: Optical Observations
  65. GRB 021004, SPM optical observations
  66. GRB 021004, optical observations
  67. INTEGRAL GRBs added to GCN
  68. GRB 020812 optical observation
  69. IPN triangulation of GRB020714
  70. IPN triangulation of GRB020714
  71. GRB020531(=H2042): Optical Observations
  72. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  73. GRB/XRF 020427, Radio Observations
  74. GRB011212: Optical Observations
  75. GRB 020322: Optical Observations
  76. GRB 020322 optical observation
  77. GRB 020317 : KISO Optical Observations
  78. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  79. RXTE Observations of SGR 1900+14
  80. IPN Upper Limits to a GRB Associated With SN2002ap
  81. GRB020124 BVRI field photometry
  82. GRB020127 Optical Observations
  83. GRB 020124 Optical Observations
  84. GRB011212: Optical observations at Gunma
  85. GRB011212: Optical observations
  86. GRB 011211, Optical Observations
  87. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  88. BeppoSAX Alert: GRB011211(=XRF011211)
  89. GRB011130 (XRF011130) Chandra Observations
  90. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  91. GRB010921, optical observation
  92. GRB010921, optical observation at early time
  93. GRB010923 as seen by BeppoSAX GRBM
  94. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  95. GRB010214 Optical Observation
  96. BeppoSAX ALERT: GRB001109
  97. HETE positions added to GCN
  98. IPN triangulation of GRB 001004
  99. GRB000620, Radio Observations
  100. GRB 000615, near-infrared observations

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