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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"

28053 results found.

  1. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  2. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  3. XRF030824: Optical observations
  4. IPN triangulation of GRB030903 (large error box)
  5. IPN triangulation of GRB030827 (large error box)
  6. GRB030823: optical observations
  7. GRB030823: optical observation at Tokyo Tech
  8. Lulin follow-up observations of GRB030823
  9. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  10. IPN detection of continued activity from SGR1806-20
  11. GRB 030817 = H2808 TAROT optical observations
  12. SGR 1808-20 (=H2802): A Possible new SGR
  13. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  14. XRF 030723: Detection of a rebrightening in the optical afterglow
  15. XRF030723, BVRcIc field photometry update
  16. IPN triangulation of GRB030801 (large error box)
  17. GRB021206 optical counterpart upper limit
  18. IPN triangulation of GRB030726 (large error box)
  19. IPN triangulation of GRB030721 (large error box)
  20. XRF030723 Radio Observations
  21. XRF 030723: confirmation of fading optical counterpart
  22. XRF030723(=H2777): Chandra Observations
  23. GRB030723: Upper limits from historical observations
  24. XRF030723: Palomar observations and proposed counterpart
  25. GRB030725 (=H2779): A Bright GRB Localized by HETE
  26. XRF030723 (= H2777): Chandra Observations Scheduled
  27. XRF030723, BVRcIc field photometry correction
  28. XRF030723, ROTSE-III Early Observations
  29. XRF030723, BVRcIc field photometry
  30. XRF 030723, optical observations
  31. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  32. Konus-Wind detection of the bursts from SGR1806-20 region
  33. SGR 1806-20, submm observations
  34. RXTE PCA Observations of SGR1806-20 Region
  35. IPN triangulation of GRB030714 (two large error boxes)
  36. IPN triangulation of GRB030715 (two large error boxes)
  37. GRB030706 triangulation (single large error box)
  38. GRB030329, optical observation in May
  39. IPN triangulation of GRB030626 (single large error box)
  40. IPN triangulation of GRB030626 (two large error boxes)
  41. GRB030329: second XMM-Newton observation
  42. GRB030329 -- RATAN-600 data in April-May
  43. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  44. IPN triangulation of GRB030606 (two alternate error boxes)
  45. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  46. GRB 030528: tentative NIR counterpart
  47. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  48. GRB030528, BVRI field photometry
  49. GRB030329, SPM optical observations
  50. GRB030528: Chandra TOO Planned
  51. GRB030528(=H2724): Revised SXC Localization
  52. GRB 030528 Bisei optical observation
  53. GRB030528 (H2724): A long GRB localized by HETE
  54. GRB 030329: Correction to GCN 2254
  55. GRB 030329: Optical Observations
  56. GRB 030528 (=H2724) Kyoto optical observation
  57. GRB 030416: Optical Observations
  58. GRB 030329 Optical Observations
  59. GRB030329: XMM-Newton observation
  60. GRB 021004: HST observations
  61. GRB030324: Further Observations of the Candidate Optical Afterglow
  62. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  63. IPN triangulation of GRB030519B=H2716 (small error box)
  64. HETE GRB030329, correction to Rc Observations in Loiano
  65. GRB 030329: Optical limit (contemporaneous imaging)
  66. IPN triangulation of GRB030509 (small errror box)
  67. GRB030329, BVRI photometry
  68. GRB030429, refiend optical brightness
  69. GRB 030329: Optical limit (contemporaneous photography)
  70. GRB030418, BVRcIc field photometry
  71. GRB030429, BVRcIc field photometry
  72. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  73. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  74. GRB030329: RTT150 optical observations and upper limit for a host
  75. GRB030501, optical observation
  76. GRB030501 triangulation (correction to GCN 2194)
  77. GRB030329: RTT150 optical observations and upper limit for a host
  78. GRB 030429: redshift from VLT spectroscopy
  79. GRB030501B triangulation (single error box)
  80. GRB 030329, BVRI photometry
  81. GRB030429: Optical Observations
  82. GRB030501: TAROT candidate afterglow present in archival images
  83. GRB 030429: confirmation of afterglow candidate
  84. GRB 030329 Oprical observations in Rozhen observatory
  85. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  86. IPN triangulation of GRB030425 (single error box)
  87. GRB 030329, the review of the sky area in plate archive (1950-1998)
  88. GRB 030329: optical spectropolarimetry at VLT
  89. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  90. GRB030329: optical polarization
  91. IPN triangulation of GRB030422 (two large error boxes)
  92. GRB030329, optical observation
  93. MASTER:optical observations GRB030418
  94. MASTER:optical observations probable GRB030414
  95. GRB030418: Kiso near infrared observations
  96. GRB 030418: Optical afterglow
  97. OT GRB 030329: early UBVRcIc spectral evolution
  98. OT GRB 030329: early spectrum
  99. IPN triangulation of GRB030414 (small error box)
  100. IPN triangulation of GRB030413 (small error box)

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