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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"

5819 results found.

  1. GRB 040423 (=H3175): A Long GRB Localized by HETE
  2. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  3. GRB031220: Palomar Observations
  4. GRB 031220 : Kyoto Optical Observation
  5. GRB 031220: Optical observation at Tokyo Tech
  6. GRB 031203: Discovery of a dust echo
  7. GRB031203: K' Photometry of the likely GRB host
  8. IPN triangulation of GRB031111 (=H2924): small error box
  9. Lulin optical follow-up observations of GRB031026
  10. GRB 031026: Ic Observations
  11. IPN triangulation of GRB030919 (large error box)
  12. GRB030913: AAVSO optical observations
  13. 030813 SGR event (Konus-Wind observation)
  14. SGR 1808-20 (=H2802): A Possible new SGR
  15. XRF030723(=H2777): Chandra Observations
  16. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  17. GRB 021206, Radio afterglow candidate
  18. GRB030329, Optical observations
  19. GRB 021004: HST observations
  20. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  21. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  22. GRB030329: 444 AAVSO Measurements
  23. IPN triangulation of GRB050403 (small error box)
  24. GRB030329: RTT150 optical observations
  25. GRB030329: More AAVSO VR obs
  26. GRB 030329, BVRI photometry
  27. GRB030329: final R-band light curve by MASTER
  28. GRB 030329, BRI photometry
  29. GRB 030329: Additional Mt. Laguna Optical Observations
  30. GRB 030329: optical observations
  31. GRB 030329: OT candidate
  32. GRB030323: V, R, I photometry
  33. GRB 030227: Optical limit at RIKEN
  34. GRB 030227: Kyoto optical observation
  35. Possible GRB 20030109 seen by SPI ACS
  36. GRB021211: APO optical observations
  37. GRB021211: Optical observations
  38. GRB021113 (=H2449): A Long GRB Localized by HETE
  39. GRB021104: Optical observations
  40. GRB021104: optical observations
  41. GRB021104: possible optical afterglow
  42. IPN triangulation of GRB021023 (small error boc)
  43. GRB021016(=H2397): A Long GRB Localized by HETE
  44. GRB021004: Optical Observations
  45. GRB021004: Optical Observations
  46. GRB021004: BVRc photometry
  47. GRB021004: not fading anymore?
  48. GRB 021004: Optical Photometry at 2.5 Days
  49. GRB 021004: Optical observations at RIKEN
  50. GRB 021004: Optical Observations
  51. GRB 021004, optical observations
  52. GRB 021004: Optical Observations
  53. GRB 021004, SPM optical observations
  54. GRB 021004, optical observations
  55. INTEGRAL GRBs added to GCN
  56. GRB 020812 optical observation
  57. IPN triangulation of GRB020714
  58. IPN triangulation of GRB020714
  59. GRB020531(=H2042): Optical Observations
  60. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  61. GRB/XRF 020427, Radio Observations
  62. GRB011212: Optical Observations
  63. GRB 020322: Optical Observations
  64. GRB 020322 optical observation
  65. GRB 020317 : KISO Optical Observations
  66. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  67. RXTE Observations of SGR 1900+14
  68. IPN Upper Limits to a GRB Associated With SN2002ap
  69. GRB020124 BVRI field photometry
  70. GRB020127 Optical Observations
  71. GRB 020124 Optical Observations
  72. GRB011212: Optical observations at Gunma
  73. GRB011212: Optical observations
  74. GRB 011211, Optical Observations
  75. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  76. BeppoSAX Alert: GRB011211(=XRF011211)
  77. GRB011130 (XRF011130) Chandra Observations
  78. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  79. GRB010921, optical observation
  80. GRB010921, optical observation at early time
  81. GRB010923 as seen by BeppoSAX GRBM
  82. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  83. GRB010214 Optical Observation
  84. BeppoSAX ALERT: GRB001109
  85. HETE positions added to GCN
  86. IPN triangulation of GRB 001004
  87. GRB000620, Radio Observations
  88. GRB 000615, near-infrared observations
  89. GRB000508B, optical photometry
  90. Possible GRB-related phenomenon
  91. GRB 000408, optical observations
  92. GRB000326, Radio observations
  93. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  94. GRB000301C: RXTE/ASM and IPN localizations
  95. GRB991216, optical observations
  96. GRB 991216, optical observations
  97. GRB 991216, Optical Transient
  98. GRB 991216, Optical Afterglow
  99. GRB991216 ('Beethoven Burst') B, R, and K Observations
  100. GRB991216, infrared observations

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