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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"

45445 results found.

  1. On Line Availability of Archival HETE Fregate Data and Lightcurves
  2. GRB040422: optical observations at Xinglong Observatory
  3. GRB040422: optical observations at CrAO
  4. GRB 040423 (=H3175): A Long GRB Localized by HETE
  5. GRB040422, optical observations at Loiano
  6. GRB040422 : I-band follow-up observation at Lulin Observatory
  7. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  8. GRB040422, BVRcIc field calibration
  9. GRB 040422,optical observation
  10. GRB040422: optical and NIR observations at the VLT
  11. GRB 040422: a long GRB detected with INTEGRAL
  12. GRB 040403, deep optical observations
  13. MASTER: HETE Alert 3163, 3167 technical optical observation
  14. INTEGRAL-SPI/ACS GRB data: timing correction
  15. IBAS GRB alerts 1739, 1740, 1741
  16. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  17. GRB 040403: Optical Observations
  18. GRB 040403 Optical Observations
  19. GRB 040403: Optical observations
  20. GRB 040403: optical observations
  21. GRB 040403: Optical Observations
  22. GRB 040403: a long GRB detected with INTEGRAL
  23. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  24. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  25. IBAS GRB Alert 1694
  26. GRB040323: NIR Observations and Variable Object
  27. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  28. GRB 040323, a dark GRB ?
  29. short hard GRB 040322
  30. GRB 040323: a long GRB detected with INTEGRAL
  31. IBAS GRB alerts 1679, 1680, 1681
  32. GRB040223: Deep NIR NTT data re-analysis
  33. GRB 040223: XMM-Newton results
  34. GRB040223, improved XMM position
  35. IBAS Alert 1678: not a GRB
  36. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  37. GRB 031203, possible supernova
  38. MASTER: RXTE GRB040308 optical observation
  39. IBAS results on a burst from SGR1806-20
  40. INTEGRAL detection of activity from SGR1806-20
  41. RXTE GRB040229 optical observation: no candidate
  42. GRB 040228 Optical observations
  43. IPN triangulation of GRB040228 (H3066, H3067)
  44. GRB040228 : KISO optical follow-up observation
  45. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  46. GRB 040223: Deep NIR NTT observations
  47. GRB 040223 : Optical observation (non-detection)
  48. XMM-Newton Images of GRB 040223
  49. GRB 040223, VLA observations
  50. GRB 040223: REM IJK Observations
  51. GRB 040223 XMM-Newton observation ...
  52. GRB 031203 XMM-Newton observation
  53. GRB 040223 : Planned XMM-Newton observation
  54. GRB 040106 : Planned XMM-Newton observation
  55. GRB 040223: further offline analysis
  56. GRB 040223: a long GRB detected with INTEGRAL
  57. GRB031111, optical observations
  58. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  59. GRB031203: Chandra Observations
  60. GRB040106, follow-up radio observations
  61. GRB040106: refined X-ray transient position
  62. Follow-up on IBAS GRB Alert 1379
  63. IBAS GRB alert 1379
  64. SN 2003dh/GRB030329 late-time optical spectroscopy
  65. GRB040106, Radio Observations
  66. GRB040106, likely optical afterglow
  67. GRB040106: Second Epoch Optical Observations
  68. GRB 031220: Optical observations of Chandra X-ray sources
  69. XMM-Newton Images of GRB 040106
  70. GRB040106: optical observations with REM+ROSS
  71. GRB031220: observation at Univercity of Miyazaki
  72. GRB 040106: Optical observations
  73. XMM-Newton observation of GRB040106
  74. GRB 040106 : Planned XMM-Newton observation
  75. GRB 040106 : peak flux
  76. GRB 040106 : a long GRB detected with INTEGRAL
  77. IPN triangulation of an intermediate burst from SGR1806-20
  78. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  79. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  80. GRB031225a triangulation (annulus)
  81. IPN triangulation of GRB031219 (large error box)
  82. GRB031220: Palomar Observations
  83. GRB 031220 : Kyoto Optical Observation
  84. GRB 031220: Subaru observation
  85. GRB 031220: Optical observation at Tokyo Tech
  86. GRB031220: ROTSE-IIIb Optical Limits
  87. GRB031220 : Optical Observation of Lulin Observatory
  88. GRB 031203 I-band monitoring
  89. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  90. GRB 2974 follow-up observations
  91. GRB031203, improved XMM position
  92. GRB 031203: Discovery of a dust echo
  93. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  94. GRB030921 triangulation (annulus)
  95. GRB 031203: SMARTS optical monitoring
  96. GRB 021203: A Normal GRB viewed far off axis?
  97. XMM-Newton Observations of GRB031203: Preliminary Images
  98. GRB 031203: Variable Radio Source
  99. GRB 031203: Magellan spectrum of possible GRB host
  100. GRB 031203: Optical/IR Astrometry

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