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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"

32538 results found.

  1. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  2. Activivty of SGR 1806-20
  3. GRB 040511, very fast decay?
  4. GRB 030324: Detection and Color of Host Galaxy
  5. GRB 040511: NIR observations with REM
  6. GRB040511: Redshift identifcation
  7. GRB 040511: Optical limit
  8. GRB040511: Candidate optical/NIR afterglow
  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. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  16. IPN triangulation of GRB040425 (=H3183)
  17. On Line Availability of Archival HETE Fregate Data and Lightcurves
  18. GRB040422, optical observations at Loiano
  19. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  20. GRB040422, BVRcIc field calibration
  21. GRB040422: optical and NIR observations at the VLT
  22. GRB 040403, deep optical observations
  23. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  24. GRB 040403: Optical Observations
  25. GRB 040403 Optical Observations
  26. GRB 040403: Optical observations
  27. GRB 040403: optical observations
  28. GRB 040403: Optical Observations
  29. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  30. GRB040323: NIR Observations and Variable Object
  31. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  32. GRB 040323, a dark GRB ?
  33. GRB040223: Deep NIR NTT data re-analysis
  34. GRB 040223: XMM-Newton results
  35. GRB040223, improved XMM position
  36. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  37. GRB 031203, possible supernova
  38. IBAS results on a burst from SGR1806-20
  39. GRB 040228 Optical observations
  40. IPN triangulation of GRB040228 (H3066, H3067)
  41. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  42. GRB 040223: Deep NIR NTT observations
  43. GRB 040223 : Optical observation (non-detection)
  44. XMM-Newton Images of GRB 040223
  45. GRB 040223, VLA observations
  46. GRB 040223: REM IJK Observations
  47. GRB 040223 XMM-Newton observation ...
  48. GRB 031203 XMM-Newton observation
  49. GRB031111, optical observations
  50. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  51. GRB031203: Chandra Observations
  52. GRB040106, follow-up radio observations
  53. GRB040106: refined X-ray transient position
  54. Follow-up on IBAS GRB Alert 1379
  55. SN 2003dh/GRB030329 late-time optical spectroscopy
  56. GRB040106, Radio Observations
  57. GRB040106, likely optical afterglow
  58. GRB040106: Second Epoch Optical Observations
  59. GRB 031220: Optical observations of Chandra X-ray sources
  60. XMM-Newton Images of GRB 040106
  61. GRB040106: optical observations with REM+ROSS
  62. GRB031220: observation at Univercity of Miyazaki
  63. GRB 040106: Optical observations
  64. XMM-Newton observation of GRB040106
  65. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  66. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  67. GRB 031203 I-band monitoring
  68. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  69. GRB 2974 follow-up observations
  70. GRB031203, improved XMM position
  71. GRB 031203: SMARTS optical monitoring
  72. GRB 021203: A Normal GRB viewed far off axis?
  73. GRB 031203: Variable Radio Source
  74. GRB 031203: Magellan spectrum of possible GRB host
  75. GRB 031203: Optical/IR Astrometry
  76. GRB031203 K prime photometry: correction to galaxy coordinates
  77. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  78. XMM-Newton Observation of GRB031203
  79. GRB031203: K' Photometry of the likely GRB host
  80. XMM-Newton Observation of GRB031203
  81. GRB 031203: Radio detection
  82. GRB 031203: Further reports on December 4 observations
  83. GRB 031203: IR NTTobservations do not confirm REM detection
  84. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  85. GRB 031203: Apparent Spectral Break
  86. GRB031203: Planned XMM-Newton observation II
  87. GRB 031203: IR REM Observations
  88. GRB031203: Optical Observations
  89. GRB 031203 XMM-Newton observation
  90. GRB 031203: Optical/IR SMARTS Observations
  91. GRB031203: Planned XMM-Newton observation
  92. GRB031111A, prompt optical observations
  93. GRB 031111, Radio observations
  94. GRB 031111: Optical observations
  95. GRB 031111, optical observations
  96. SN 2003jd (SN/GRB?) -- X-ray Observations
  97. IPN triangulation of GRB031111 (=H2924): small error box
  98. XRF031109 (=H2919): A very long XRF localized by HETE
  99. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  100. GRB030929/SN2003jd association unlikely based on IPN localiztion

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