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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"

32563 results found.

  1. GRB031203 K prime photometry: correction to galaxy coordinates
  2. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  3. XMM-Newton Observation of GRB031203
  4. GRB031203: K' Photometry of the likely GRB host
  5. XMM-Newton Observation of GRB031203
  6. GRB 031203: Radio detection
  7. GRB 031203: Further reports on December 4 observations
  8. GRB 031203: IR NTTobservations do not confirm REM detection
  9. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  10. GRB 031203: Apparent Spectral Break
  11. GRB031203: Planned XMM-Newton observation II
  12. GRB 031203: IR REM Observations
  13. GRB031203: Optical Observations
  14. GRB 031203 XMM-Newton observation
  15. GRB 031203: Optical/IR SMARTS Observations
  16. GRB031203: Planned XMM-Newton observation
  17. GRB031111A, prompt optical observations
  18. GRB 031111, Radio observations
  19. GRB 031111: Optical observations
  20. GRB 031111, optical observations
  21. SN 2003jd (SN/GRB?) -- X-ray Observations
  22. IPN triangulation of GRB031111 (=H2924): small error box
  23. XRF031109 (=H2919): A very long XRF localized by HETE
  24. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  25. GRB030929/SN2003jd association unlikely based on IPN localiztion
  26. Lulin optical follow-up observations of GRB031026
  27. SN 2003jd (SN/GRB?), Radio Observations
  28. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  29. GRB 031026: Further Ic Observations
  30. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  31. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  32. IPN triangulation of GRB031024 (single error box)
  33. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  34. XRF 030824: additional observations at CFHT
  35. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  36. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  37. XRF 030723: Subaru Optical Observations
  38. XRF 030824: Early follow-up observation at Kiso observatory
  39. XRF 030723: Detection of the likely host galaxy
  40. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  41. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  42. IPN triangulation of GRB030922A (large error box)
  43. IPN triangulation of GRB030921 (large error box)
  44. GRB030913: Subaru Optical Observations
  45. GRB 030913: ROTSE-3c Optical Observations
  46. GRB030913: OT's limit by MASTER
  47. GRB030913, candidate afterglow observations
  48. GRB030913: AAVSO optical observations
  49. GRB030913 (=H2849): Confirmation of the Flight Localization
  50. GRB030913 (=H2849): TAROT Observations
  51. Magellan Observations of GRB030725 (=H2779)
  52. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  53. IBAS detection of bursts from SGR 1806-20
  54. Radio Observations of SGR1806-20
  55. GRB 030824: Candidate Follow-Up
  56. XRF030824: Second-epoch Palomar observations
  57. XRF030824: optical observations
  58. XRF030824: Palomar observations
  59. GRB030823: optical observation at Tokyo Tech
  60. RAPTOR observations of GRB030823
  61. IPN triangulation of GRB030821 (=H2814; refined error box)
  62. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  63. Summary of recent IPN and HETE detections of SGR bursts
  64. Clarification of GCN 2354 on SGR1806-20
  65. IPN detection of continued activity from SGR1806-20
  66. 030813 SGR event (Konus-Wind observation)
  67. SGR 1808-20 (=H2802): A Possible new SGR
  68. GRB 021206 Optical Observations
  69. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  70. IPN/HETE summary of recent bursts from SGR1806-20
  71. XRF 030723: Detection of a rebrightening in the optical afterglow
  72. GRB030725: Optical observations
  73. XRF030723, BVRcIc field photometry update
  74. GRB021206 optical counterpart upper limit
  75. XRF030723: Re-analysis of ROTSE-III early images
  76. IPN triangulation of GRB030725 (=H2779; small error box)
  77. XRF030723 (=H2777): Second Epoch Magellan Observations
  78. GRB 030725: optical observations.
  79. GRB030725, optical transient observations
  80. XRF030723 Radio Observations
  81. XRF 030723: confirmation of fading optical counterpart
  82. XRF030723(=H2777): Chandra Observations
  83. XRF 030723: VLT spectra
  84. Magellan Observations of XRF030723 (=H2777)
  85. GRB030723: Upper limits from historical observations
  86. GRB030725, possible optical transient
  87. XRF030723: Palomar observations and proposed counterpart
  88. GRB030725 (=H2779): A Bright GRB Localized by HETE
  89. XRF030723: optical observations
  90. XRF030723 (= H2777): Chandra Observations Scheduled
  91. XRF030723, BVRcIc field photometry
  92. XRF030723, optical observations
  93. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  94. Konus-Wind detection of the bursts from SGR1806-20 region
  95. SGR 1806-20, submm observations
  96. RXTE PCA Observations of SGR1806-20 Region
  97. GRB030329: Subaru Optical Spectroscopy
  98. Triangulation of GRB030715 (single large error box)
  99. Triangulation of GRB030714 (single large error box)
  100. GRB030329: RTT150 optical observations

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