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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"

23683 results found.

  1. GRB030922 triangulation (annulus)
  2. GRB030913: OT's limit by MASTER
  3. GRB030913, candidate afterglow observations
  4. GRB030913 (=H2849): Confirmation of the Flight Localization
  5. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  6. Magellan Observations of GRB030725 (=H2779)
  7. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  8. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  9. IBAS detection of bursts from SGR 1806-20
  10. IPN triangulation of GRB030830 (large error box)
  11. GRB 030824: Candidate Follow-Up
  12. XRF030824: Second-epoch Palomar observations
  13. GRB030823: optical observations
  14. GRB030823: Palomar observations
  15. XRF030824: Palomar observations
  16. GRB030823: optical observation at Tokyo Tech
  17. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  18. Summary of recent IPN and HETE detections of SGR bursts
  19. IPN detection of continued activity from SGR1806-20
  20. SGR 1808-20 (=H2802): A Possible new SGR
  21. IPN/HETE summary of recent bursts from SGR1806-20
  22. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  23. XRF030723: Re-analysis of ROTSE-III early images
  24. XRF030723 (=H2777): Second Epoch Magellan Observations
  25. GRB030725, possible optical transient
  26. XRF030723: Palomar observations and proposed counterpart
  27. GRB030725 (=H2779): A Bright GRB Localized by HETE
  28. XRF030723, BVRcIc field photometry correction
  29. XRF030723, ROTSE-III Early Observations
  30. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  31. Konus-Wind detection of the bursts from SGR1806-20 region
  32. IBAS GRB Alerts 969 970
  33. SGR 1806-20, submm observations
  34. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  35. IPN triangulation of GRB030717 (annulus)
  36. 030716 NOT a GRB
  37. 030629 NOT a real GRB
  38. GRB030329: second XMM-Newton observation
  39. GRB030418: R optical observations
  40. GRB 030528: tentative NIR counterpart
  41. GRB030329, further radio observations at GMRT
  42. MASTER: optical observation GRB030601
  43. GRB030528(=H2724): Revised SXC Localization
  44. GRB 030329/SN 2003dh: Jitter Episode
  45. GRB 030528, Teramo optical observation
  46. GRB030528 (H2724): A long GRB localized by HETE
  47. GRB 030329: Correction to GCN 2254
  48. GRB 030329: Optical Observations
  49. GRB 030416: Optical Observations
  50. GRB030329, Optical observations
  51. GRB 030329/SN 2003dh: Possible increase in brightness
  52. GRB 021004: HST observations
  53. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  54. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  55. GRB 030329: Optical limit (contemporaneous imaging)
  56. GRB030329, BVRI photometry
  57. GRB 030329: Optical limit (contemporaneous photography)
  58. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  59. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  60. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  61. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  62. GRB030501, optical observation
  63. GRB030501 triangulation (correction to GCN 2194)
  64. GRB 030329 Optical Observations
  65. GRB030328, optical observation
  66. GRB 030329, BVRI photometry
  67. IPN triangulation of GRB030501 (IBIS event; annulus)
  68. GRB030501 localized by INTEGRAL
  69. IPN triangulation of GRB030428 (two large error boxes)
  70. GRB 030429: ROTSE-III observations
  71. GRB030329 observed as a sudden ionospheric disturbance (SID)
  72. IPN triangulation of GRB030426 (annulus)
  73. GRB 030329: optical spectropolarimetry at VLT
  74. GRB030329, optical observation
  75. MASTER:optical observations GRB030416
  76. ROTSE-III prompt optical detections of GRB 030418
  77. GRB 030418: Optical afterglow candidate
  78. GRB030329: Optical Observations
  79. GRB030329, UBVRI polarimetry, R-polarization
  80. GRB 030329: SARA Optical Observations
  81. OT GRB 030329: early spectrum
  82. GRB030324: Candidate Optical Afterglow
  83. Superluminal motion in GRB 030329 (Correction)
  84. Superluminal motion in GRB 030329
  85. GRB 030329 and SN 2003dh
  86. GRB 030329 VLBA Observations
  87. GRB030328, UBVRcIc field photometry
  88. GRB 030329: possible color change
  89. GRB030329: RTT150 optical observations
  90. GRB030329: Kiso B and R band observations
  91. GRB030329: More AAVSO VR obs
  92. GRB 030329: SARA Optical Observations
  93. GRB 030329: SARA Optical Observations
  94. GRB030329: Optical observations
  95. GRB030329, cessation of fading
  96. GRB 030329: SARA Optical Observations
  97. GRB030329, optical observation
  98. GRB030329, optical observation
  99. GRB030329, new UBVRcIc field photometry
  100. GRB 030329, light curve and SN prediction

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