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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

42308 results found.

  1. IPN triangulation of an intense intermediate burst from SGR1806-20
  2. GRB 040511, very fast decay?
  3. GRB 030324: Detection and Color of Host Galaxy
  4. GRB 040511: NIR observations with REM
  5. GRB040511: Redshift identifcation
  6. GRB 040511: Optical limit
  7. GRB040511: Candidate optical/NIR afterglow
  8. IBAS GRB Alerts n.1785 to 1791
  9. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  10. GRB 040511: Second Epoch Optical Observations
  11. GRB 040511: Optical observations
  12. GRB 040511: Optical Observations
  13. GRB040511: Optical Observations
  14. GRB040511: Optical Observations
  15. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  16. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  17. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  18. IPN triangulation of GRB040425 (=H3183)
  19. On Line Availability of Archival HETE Fregate Data and Lightcurves
  20. GRB040422: optical observations at Xinglong Observatory
  21. GRB040422: optical observations at CrAO
  22. GRB 040423 (=H3175): A Long GRB Localized by HETE
  23. GRB040422, optical observations at Loiano
  24. GRB040422 : I-band follow-up observation at Lulin Observatory
  25. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  26. GRB040422, BVRcIc field calibration
  27. GRB 040422,optical observation
  28. GRB040422: optical and NIR observations at the VLT
  29. GRB 040422: a long GRB detected with INTEGRAL
  30. GRB 040403, deep optical observations
  31. MASTER: HETE Alert 3163, 3167 technical optical observation
  32. INTEGRAL-SPI/ACS GRB data: timing correction
  33. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  34. GRB 040403: Optical Observations
  35. GRB 040403 Optical Observations
  36. GRB 040403: Optical observations
  37. GRB 040403: optical observations
  38. GRB 040403: Optical Observations
  39. GRB 040403: a long GRB detected with INTEGRAL
  40. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  41. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  42. IBAS GRB Alert 1694
  43. GRB040323: NIR Observations and Variable Object
  44. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  45. GRB 040323, a dark GRB ?
  46. GRB 040323: a long GRB detected with INTEGRAL
  47. IBAS GRB alerts 1679, 1680, 1681
  48. GRB040223: Deep NIR NTT data re-analysis
  49. GRB 040223: XMM-Newton results
  50. GRB040223, improved XMM position
  51. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  52. GRB 031203, possible supernova
  53. MASTER: RXTE GRB040308 optical observation
  54. IBAS results on a burst from SGR1806-20
  55. INTEGRAL detection of activity from SGR1806-20
  56. RXTE GRB040229 optical observation: no candidate
  57. GRB 040228 Optical observations
  58. IPN triangulation of GRB040228 (H3066, H3067)
  59. GRB040228 : KISO optical follow-up observation
  60. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  61. GRB 040223: Deep NIR NTT observations
  62. GRB 040223 : Optical observation (non-detection)
  63. XMM-Newton Images of GRB 040223
  64. GRB 040223, VLA observations
  65. GRB 040223: REM IJK Observations
  66. GRB 040223 XMM-Newton observation ...
  67. GRB 031203 XMM-Newton observation
  68. GRB 040223 : Planned XMM-Newton observation
  69. GRB 040106 : Planned XMM-Newton observation
  70. GRB 040223: a long GRB detected with INTEGRAL
  71. GRB031111, optical observations
  72. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  73. GRB031203: Chandra Observations
  74. GRB040106, follow-up radio observations
  75. GRB040106: refined X-ray transient position
  76. IBAS GRB alert 1379
  77. SN 2003dh/GRB030329 late-time optical spectroscopy
  78. GRB040106, Radio Observations
  79. GRB040106, likely optical afterglow
  80. GRB040106: Second Epoch Optical Observations
  81. GRB 031220: Optical observations of Chandra X-ray sources
  82. GRB040106: optical observations with REM+ROSS
  83. GRB031220: observation at Univercity of Miyazaki
  84. GRB 040106: Optical observations
  85. GRB 040106 : Planned XMM-Newton observation
  86. GRB 040106 : a long GRB detected with INTEGRAL
  87. IPN triangulation of an intermediate burst from SGR1806-20
  88. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  89. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  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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