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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"

45454 results found.

  1. GRB 040511: Optical Observations
  2. GRB040511: Optical Observations
  3. GRB040511: Optical Observations
  4. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  5. IBAS GRB Alert number 1774: NOT a real GRB
  6. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  7. IBAS Alerts 1771 and 1772: NOT a real GRB
  8. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  9. IPN triangulation of GRB040425 (=H3183)
  10. On Line Availability of Archival HETE Fregate Data and Lightcurves
  11. GRB040422: optical observations at Xinglong Observatory
  12. GRB040422: optical observations at CrAO
  13. GRB 040423 (=H3175): A Long GRB Localized by HETE
  14. GRB040422, optical observations at Loiano
  15. GRB040422 : I-band follow-up observation at Lulin Observatory
  16. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  17. GRB040422, BVRcIc field calibration
  18. GRB 040422,optical observation
  19. GRB040422: optical and NIR observations at the VLT
  20. GRB 040422: a long GRB detected with INTEGRAL
  21. GRB 040403, deep optical observations
  22. MASTER: HETE Alert 3163, 3167 technical optical observation
  23. INTEGRAL-SPI/ACS GRB data: timing correction
  24. IBAS GRB alerts 1739, 1740, 1741
  25. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  26. GRB 040403: Optical Observations
  27. GRB 040403 Optical Observations
  28. GRB 040403: Optical observations
  29. GRB 040403: optical observations
  30. GRB 040403: Optical Observations
  31. GRB 040403: a long GRB detected with INTEGRAL
  32. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  33. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  34. IBAS GRB Alert 1694
  35. GRB040323: NIR Observations and Variable Object
  36. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  37. GRB 040323, a dark GRB ?
  38. short hard GRB 040322
  39. GRB 040323: a long GRB detected with INTEGRAL
  40. IBAS GRB alerts 1679, 1680, 1681
  41. GRB040223: Deep NIR NTT data re-analysis
  42. GRB 040223: XMM-Newton results
  43. GRB040223, improved XMM position
  44. IBAS Alert 1678: not a GRB
  45. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  46. GRB 031203, possible supernova
  47. MASTER: RXTE GRB040308 optical observation
  48. IBAS results on a burst from SGR1806-20
  49. INTEGRAL detection of activity from SGR1806-20
  50. RXTE GRB040229 optical observation: no candidate
  51. GRB 040228 Optical observations
  52. IPN triangulation of GRB040228 (H3066, H3067)
  53. GRB040228 : KISO optical follow-up observation
  54. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  55. GRB 040223: Deep NIR NTT observations
  56. GRB 040223 : Optical observation (non-detection)
  57. XMM-Newton Images of GRB 040223
  58. GRB 040223, VLA observations
  59. GRB 040223: REM IJK Observations
  60. GRB 040223 XMM-Newton observation ...
  61. GRB 031203 XMM-Newton observation
  62. GRB 040223 : Planned XMM-Newton observation
  63. GRB 040106 : Planned XMM-Newton observation
  64. GRB 040223: further offline analysis
  65. GRB 040223: a long GRB detected with INTEGRAL
  66. GRB031111, optical observations
  67. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  68. GRB031203: Chandra Observations
  69. GRB040106, follow-up radio observations
  70. GRB040106: refined X-ray transient position
  71. Follow-up on IBAS GRB Alert 1379
  72. IBAS GRB alert 1379
  73. SN 2003dh/GRB030329 late-time optical spectroscopy
  74. GRB040106, Radio Observations
  75. GRB040106, likely optical afterglow
  76. GRB040106: Second Epoch Optical Observations
  77. GRB 031220: Optical observations of Chandra X-ray sources
  78. XMM-Newton Images of GRB 040106
  79. GRB040106: optical observations with REM+ROSS
  80. GRB031220: observation at Univercity of Miyazaki
  81. GRB 040106: Optical observations
  82. XMM-Newton observation of GRB040106
  83. GRB 040106 : Planned XMM-Newton observation
  84. GRB 040106 : peak flux
  85. GRB 040106 : a long GRB detected with INTEGRAL
  86. IPN triangulation of an intermediate burst from SGR1806-20
  87. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  88. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  89. GRB031225a triangulation (annulus)
  90. IPN triangulation of GRB031219 (large error box)
  91. GRB031220: Palomar Observations
  92. GRB 031220 : Kyoto Optical Observation
  93. GRB 031220: Subaru observation
  94. GRB 031220: Optical observation at Tokyo Tech
  95. GRB031220: ROTSE-IIIb Optical Limits
  96. GRB031220 : Optical Observation of Lulin Observatory
  97. GRB 031203 I-band monitoring
  98. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  99. GRB 2974 follow-up observations
  100. GRB031203, improved XMM position

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