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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"

32537 results found.

  1. Activivty of SGR 1806-20
  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. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  9. GRB 040511: Second Epoch Optical Observations
  10. GRB 040511: Optical observations
  11. GRB 040511: Optical Observations
  12. GRB040511: Optical Observations
  13. GRB040511: Optical Observations
  14. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  15. IPN triangulation of GRB040425 (=H3183)
  16. On Line Availability of Archival HETE Fregate Data and Lightcurves
  17. GRB040422, optical observations at Loiano
  18. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  19. GRB040422, BVRcIc field calibration
  20. GRB040422: optical and NIR observations at the VLT
  21. GRB 040403, deep optical observations
  22. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  23. GRB 040403: Optical Observations
  24. GRB 040403 Optical Observations
  25. GRB 040403: Optical observations
  26. GRB 040403: optical observations
  27. GRB 040403: Optical Observations
  28. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  29. GRB040323: NIR Observations and Variable Object
  30. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  31. GRB 040323, a dark GRB ?
  32. GRB040223: Deep NIR NTT data re-analysis
  33. GRB 040223: XMM-Newton results
  34. GRB040223, improved XMM position
  35. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  36. GRB 031203, possible supernova
  37. IBAS results on a burst from SGR1806-20
  38. GRB 040228 Optical observations
  39. IPN triangulation of GRB040228 (H3066, H3067)
  40. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  41. GRB 040223: Deep NIR NTT observations
  42. GRB 040223 : Optical observation (non-detection)
  43. XMM-Newton Images of GRB 040223
  44. GRB 040223, VLA observations
  45. GRB 040223: REM IJK Observations
  46. GRB 040223 XMM-Newton observation ...
  47. GRB 031203 XMM-Newton observation
  48. GRB031111, optical observations
  49. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  50. GRB031203: Chandra Observations
  51. GRB040106, follow-up radio observations
  52. GRB040106: refined X-ray transient position
  53. Follow-up on IBAS GRB Alert 1379
  54. SN 2003dh/GRB030329 late-time optical spectroscopy
  55. GRB040106, Radio Observations
  56. GRB040106, likely optical afterglow
  57. GRB040106: Second Epoch Optical Observations
  58. GRB 031220: Optical observations of Chandra X-ray sources
  59. XMM-Newton Images of GRB 040106
  60. GRB040106: optical observations with REM+ROSS
  61. GRB031220: observation at Univercity of Miyazaki
  62. GRB 040106: Optical observations
  63. XMM-Newton observation of GRB040106
  64. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  65. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  66. GRB 031203 I-band monitoring
  67. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  68. GRB 2974 follow-up observations
  69. GRB031203, improved XMM position
  70. GRB 031203: SMARTS optical monitoring
  71. GRB 021203: A Normal GRB viewed far off axis?
  72. GRB 031203: Variable Radio Source
  73. GRB 031203: Magellan spectrum of possible GRB host
  74. GRB 031203: Optical/IR Astrometry
  75. GRB031203 K prime photometry: correction to galaxy coordinates
  76. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  77. XMM-Newton Observation of GRB031203
  78. GRB031203: K' Photometry of the likely GRB host
  79. XMM-Newton Observation of GRB031203
  80. GRB 031203: Radio detection
  81. GRB 031203: Further reports on December 4 observations
  82. GRB 031203: IR NTTobservations do not confirm REM detection
  83. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  84. GRB 031203: Apparent Spectral Break
  85. GRB031203: Planned XMM-Newton observation II
  86. GRB 031203: IR REM Observations
  87. GRB031203: Optical Observations
  88. GRB 031203 XMM-Newton observation
  89. GRB 031203: Optical/IR SMARTS Observations
  90. GRB031203: Planned XMM-Newton observation
  91. GRB031111A, prompt optical observations
  92. GRB 031111, Radio observations
  93. GRB 031111: Optical observations
  94. GRB 031111, optical observations
  95. SN 2003jd (SN/GRB?) -- X-ray Observations
  96. IPN triangulation of GRB031111 (=H2924): small error box
  97. XRF031109 (=H2919): A very long XRF localized by HETE
  98. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  99. GRB030929/SN2003jd association unlikely based on IPN localiztion
  100. Lulin optical follow-up observations of GRB031026

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