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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"

32692 results found.

  1. GRB 040223 XMM-Newton observation ...
  2. GRB 031203 XMM-Newton observation
  3. GRB031111, optical observations
  4. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  5. GRB031203: Chandra Observations
  6. GRB040106, follow-up radio observations
  7. GRB040106: refined X-ray transient position
  8. Follow-up on IBAS GRB Alert 1379
  9. SN 2003dh/GRB030329 late-time optical spectroscopy
  10. GRB040106, Radio Observations
  11. GRB040106, likely optical afterglow
  12. GRB040106: Second Epoch Optical Observations
  13. GRB 031220: Optical observations of Chandra X-ray sources
  14. XMM-Newton Images of GRB 040106
  15. GRB040106: optical observations with REM+ROSS
  16. GRB031220: observation at Univercity of Miyazaki
  17. GRB 040106: Optical observations
  18. XMM-Newton observation of GRB040106
  19. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  20. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  21. GRB 031203 I-band monitoring
  22. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  23. GRB 2974 follow-up observations
  24. GRB031203, improved XMM position
  25. GRB 031203: SMARTS optical monitoring
  26. GRB 021203: A Normal GRB viewed far off axis?
  27. GRB 031203: Variable Radio Source
  28. GRB 031203: Magellan spectrum of possible GRB host
  29. GRB 031203: Optical/IR Astrometry
  30. GRB031203 K prime photometry: correction to galaxy coordinates
  31. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  32. XMM-Newton Observation of GRB031203
  33. GRB031203: K' Photometry of the likely GRB host
  34. XMM-Newton Observation of GRB031203
  35. GRB 031203: Radio detection
  36. GRB 031203: Further reports on December 4 observations
  37. GRB 031203: IR NTTobservations do not confirm REM detection
  38. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  39. GRB 031203: Apparent Spectral Break
  40. GRB031203: Planned XMM-Newton observation II
  41. GRB 031203: IR REM Observations
  42. GRB031203: Optical Observations
  43. GRB 031203 XMM-Newton observation
  44. GRB 031203: Optical/IR SMARTS Observations
  45. GRB031203: Planned XMM-Newton observation
  46. GRB031111A, prompt optical observations
  47. GRB 031111, Radio observations
  48. GRB 031111: Optical observations
  49. GRB 031111, optical observations
  50. SN 2003jd (SN/GRB?) -- X-ray Observations
  51. IPN triangulation of GRB031111 (=H2924): small error box
  52. XRF031109 (=H2919): A very long XRF localized by HETE
  53. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  54. GRB030929/SN2003jd association unlikely based on IPN localiztion
  55. Lulin optical follow-up observations of GRB031026
  56. SN 2003jd (SN/GRB?), Radio Observations
  57. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  58. GRB 031026: Further Ic Observations
  59. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  60. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  61. IPN triangulation of GRB031024 (single error box)
  62. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  63. XRF 030824: additional observations at CFHT
  64. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  65. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  66. XRF 030723: Subaru Optical Observations
  67. XRF 030824: Early follow-up observation at Kiso observatory
  68. XRF 030723: Detection of the likely host galaxy
  69. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  70. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  71. IPN triangulation of GRB030922A (large error box)
  72. IPN triangulation of GRB030921 (large error box)
  73. GRB030913: Subaru Optical Observations
  74. GRB 030913: ROTSE-3c Optical Observations
  75. GRB030913: OT's limit by MASTER
  76. GRB030913, candidate afterglow observations
  77. GRB030913: AAVSO optical observations
  78. GRB030913 (=H2849): Confirmation of the Flight Localization
  79. GRB030913 (=H2849): TAROT Observations
  80. Magellan Observations of GRB030725 (=H2779)
  81. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  82. IBAS detection of bursts from SGR 1806-20
  83. Radio Observations of SGR1806-20
  84. GRB 030824: Candidate Follow-Up
  85. XRF030824: Second-epoch Palomar observations
  86. XRF030824: optical observations
  87. XRF030824: Palomar observations
  88. GRB030823: optical observation at Tokyo Tech
  89. RAPTOR observations of GRB030823
  90. IPN triangulation of GRB030821 (=H2814; refined error box)
  91. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  92. Summary of recent IPN and HETE detections of SGR bursts
  93. Clarification of GCN 2354 on SGR1806-20
  94. IPN detection of continued activity from SGR1806-20
  95. 030813 SGR event (Konus-Wind observation)
  96. SGR 1808-20 (=H2802): A Possible new SGR
  97. GRB 021206 Optical Observations
  98. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  99. IPN/HETE summary of recent bursts from SGR1806-20
  100. XRF 030723: Detection of a rebrightening in the optical afterglow

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