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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"

32550 results found.

  1. GRB 031203 XMM-Newton observation
  2. GRB 031203: Optical/IR SMARTS Observations
  3. GRB031203: Planned XMM-Newton observation
  4. GRB031111A, prompt optical observations
  5. GRB 031111, Radio observations
  6. GRB 031111: Optical observations
  7. GRB 031111, optical observations
  8. SN 2003jd (SN/GRB?) -- X-ray Observations
  9. IPN triangulation of GRB031111 (=H2924): small error box
  10. XRF031109 (=H2919): A very long XRF localized by HETE
  11. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  12. GRB030929/SN2003jd association unlikely based on IPN localiztion
  13. Lulin optical follow-up observations of GRB031026
  14. SN 2003jd (SN/GRB?), Radio Observations
  15. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  16. GRB 031026: Further Ic Observations
  17. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  18. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  19. IPN triangulation of GRB031024 (single error box)
  20. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  21. XRF 030824: additional observations at CFHT
  22. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  23. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  24. XRF 030723: Subaru Optical Observations
  25. XRF 030824: Early follow-up observation at Kiso observatory
  26. XRF 030723: Detection of the likely host galaxy
  27. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  28. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  29. IPN triangulation of GRB030922A (large error box)
  30. IPN triangulation of GRB030921 (large error box)
  31. GRB030913: Subaru Optical Observations
  32. GRB 030913: ROTSE-3c Optical Observations
  33. GRB030913: OT's limit by MASTER
  34. GRB030913, candidate afterglow observations
  35. GRB030913: AAVSO optical observations
  36. GRB030913 (=H2849): Confirmation of the Flight Localization
  37. GRB030913 (=H2849): TAROT Observations
  38. Magellan Observations of GRB030725 (=H2779)
  39. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  40. IBAS detection of bursts from SGR 1806-20
  41. Radio Observations of SGR1806-20
  42. GRB 030824: Candidate Follow-Up
  43. XRF030824: Second-epoch Palomar observations
  44. XRF030824: optical observations
  45. XRF030824: Palomar observations
  46. GRB030823: optical observation at Tokyo Tech
  47. RAPTOR observations of GRB030823
  48. IPN triangulation of GRB030821 (=H2814; refined error box)
  49. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  50. Summary of recent IPN and HETE detections of SGR bursts
  51. Clarification of GCN 2354 on SGR1806-20
  52. IPN detection of continued activity from SGR1806-20
  53. 030813 SGR event (Konus-Wind observation)
  54. SGR 1808-20 (=H2802): A Possible new SGR
  55. GRB 021206 Optical Observations
  56. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  57. IPN/HETE summary of recent bursts from SGR1806-20
  58. XRF 030723: Detection of a rebrightening in the optical afterglow
  59. GRB030725: Optical observations
  60. XRF030723, BVRcIc field photometry update
  61. GRB021206 optical counterpart upper limit
  62. XRF030723: Re-analysis of ROTSE-III early images
  63. IPN triangulation of GRB030725 (=H2779; small error box)
  64. XRF030723 (=H2777): Second Epoch Magellan Observations
  65. GRB 030725: optical observations.
  66. GRB030725, optical transient observations
  67. XRF030723 Radio Observations
  68. XRF 030723: confirmation of fading optical counterpart
  69. XRF030723(=H2777): Chandra Observations
  70. XRF 030723: VLT spectra
  71. Magellan Observations of XRF030723 (=H2777)
  72. GRB030723: Upper limits from historical observations
  73. GRB030725, possible optical transient
  74. XRF030723: Palomar observations and proposed counterpart
  75. GRB030725 (=H2779): A Bright GRB Localized by HETE
  76. XRF030723: optical observations
  77. XRF030723 (= H2777): Chandra Observations Scheduled
  78. XRF030723, BVRcIc field photometry
  79. XRF030723, optical observations
  80. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  81. Konus-Wind detection of the bursts from SGR1806-20 region
  82. SGR 1806-20, submm observations
  83. RXTE PCA Observations of SGR1806-20 Region
  84. GRB030329: Subaru Optical Spectroscopy
  85. Triangulation of GRB030715 (single large error box)
  86. Triangulation of GRB030714 (single large error box)
  87. GRB030329: RTT150 optical observations
  88. GRBlog: Compilation of all GCN Circ. data
  89. GRB030706 triangulation (single large error box)
  90. GRB030329, optical observation in May
  91. IPN triangulation of GRB030626 (single large error box)
  92. GRB030418: R optical observations
  93. Final IPN error ellipse for GRB021206 (the polarized GRB)
  94. GRB 021206, Radio afterglow candidate
  95. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  96. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  97. GRB 030528: Optical Observations
  98. GRB 030528: tentative NIR counterpart
  99. GRB 030528, radio observations
  100. GRB030329, further radio observations at GMRT

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