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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"

41698 results found.

  1. GRB 030528, Teramo optical observation
  2. GRB 030528 Bisei optical observation
  3. GRB030528 (H2724): A long GRB localized by HETE
  4. GRB 030329: Correction to GCN 2254
  5. GRB 030329: Optical Observations
  6. GRB 030528: Optical observations at RIKEN
  7. GRB 030416: Optical Observations
  8. GRB 030329: Planned XMM-Newton Observation
  9. GRB030329, Optical observations
  10. GRB 030329/SN 2003dh: Possible increase in brightness
  11. GRB 030329: HST ACS Observations of the Host
  12. GRB 030329 Optical Observations
  13. GRB030329: XMM-Newton observation
  14. GRB 021004: HST observations
  15. GRB030324: Further Observations of the Candidate Optical Afterglow
  16. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  17. IPN triangulation of GRB030519B=H2716 (small error box)
  18. GRB 030418: Second Epoch Optical Observations with Magellan
  19. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  20. IPN triangulation of GRB030514 (annulus)
  21. HETE GRB030329, correction to Rc Observations in Loiano
  22. GRB 030329: Optical limit (contemporaneous imaging)
  23. GRB 030501: final TAROT limits
  24. IPN triangulation of GRB030509 (small errror box)
  25. IPN triangulation of GRB030509 - correction
  26. GRB030329: RTT150 optical observations
  27. GRB030329, BVRI photometry
  28. GRB030429, refiend optical brightness
  29. GRB 030329: Optical limit (contemporaneous photography)
  30. GRB030418, BVRcIc field photometry
  31. GRB 030429: Redshift of neighbor galaxy
  32. GRB030429, BVRcIc field photometry
  33. GRB030429: RTT150 optical obs., correction to GCN 2208
  34. GRB 030329: High-Resolution Spectroscopy of the Host
  35. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  36. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  37. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  38. GRB030429: RTT150 optical observations, a possible host galaxy
  39. IPN triangulation of GRB030505B (large error box)
  40. GRB030329: RTT150 optical observations and upper limit for a host
  41. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  42. GRB030501, optical observation
  43. GRB030501 observation report
  44. GRB030501 triangulation (correction to GCN 2194)
  45. GRB030329: RTT150 optical observations and upper limit for a host
  46. GRB 030429: Radio Observations
  47. GRB 030429: redshift from VLT spectroscopy
  48. GRB 030429: IR photometry with IRSF/SIRIUS
  49. GRB030501B triangulation (single error box)
  50. GRB 030329 Optical Observations
  51. GRB030328, optical observation
  52. GRB 030329, BVRI photometry
  53. GRB030429: Optical Observations
  54. GRB030501: TAROT candidate afterglow present in archival images
  55. GRB 030501: TAROT possible candidate counterpart
  56. IPN triangulation of GRB030501 (IBIS event; annulus)
  57. GRB 030429: confirmation of afterglow candidate
  58. GRB030425: CrAO optical observation
  59. IPN triangulation of GRB030428 (two large error boxes)
  60. GRB 030329 Oprical observations in Rozhen observatory
  61. GRB 030429: ROTSE-III observations
  62. GRB 030324: Radio Observations
  63. GRB030329 observed as a sudden ionospheric disturbance (SID)
  64. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  65. GRB030329, SPM optical observations (Correction)
  66. GRB030329, SPM optical observations
  67. GRB 030329, the review of the sky area in plate archive (1950-1998)
  68. GRB 030329: Spectral Evolution of SN 2003dh
  69. Optical Observations of GRB 030418 with Magellan
  70. GRB 030329: optical spectropolarimetry at VLT
  71. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  72. GRB030329: optical polarization
  73. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  74. GRB030329, optical observation
  75. MASTER:optical observations GRB030418
  76. MASTER:optical observations probable GRB030414
  77. GRB030329: 444 AAVSO Measurements
  78. MASTER:optical observations GRB030416
  79. ROTSE-III prompt optical detections of GRB 030418
  80. GRB030418: Upper limits from recent and historical observations.
  81. GRB030418: Kiso near infrared observations
  82. GRB 030418: Optical afterglow
  83. GRB 030418: Finder for afterglow candidate
  84. GRB 030418: Optical afterglow candidate
  85. GRB 030329 OT position
  86. GRB030329: Optical Observations
  87. OT GRB 030329: early UBVRcIc spectral evolution
  88. GRB030329, UBVRI polarimetry, R-polarization
  89. GRB 030329: SARA Optical Observations
  90. OT GRB 030329: early spectrum
  91. GRB030329: VR Photometry at TNG
  92. GRB030324: Candidate Optical Afterglow (Erratum)
  93. GRB030324: Candidate Optical Afterglow
  94. GRB 030413: Optical Observations
  95. GRB 030329 Rc observations
  96. Superluminal motion in GRB 030329 (Correction)
  97. Superluminal motion in GRB 030329
  98. GRB 030329 and SN 2003dh
  99. GRB030329, optical position
  100. GRB 030329 VLBA Observations

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