Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

24472 results found.

  1. GRB 241217a/EP241217B: 1.6m Mephisto optical upper limits
  2. GRB 241209B: EP-FXT afterglow detection
  3. Konus-Wind detection of GRB 241204A (short/hard)
  4. GRB 241218A: Swift-BAT refined analysis
  5. EP 241217a: Possible J-band detection with WINTER
  6. GRB 241217A/EP241217B: Fermi-GBM Sub-Threshold Detection
  7. EP241217a: refined EP-WXT analysis and EP-FXT follow-up observations
  8. GRB 241217A: refined SVOM/MXT data analysis. Long lasting X-ray emission.
  9. GRB 241218A: REM optical upper limit
  10. GRB 241217A/EP241217b: REM optical/NIR upper limits
  11. EP241217a: REM optical/NIR upper limits
  12. EP241217a: GROWTH-India Telescope optical observations
  13. GRB 241218A: NUTTelA-TAO / BSTI Optical Limits
  14. EP241119a: 7DT Optical upper limits
  15. EP241217b: Global MASTER-Net observations report
  16. EP241217a: Xinglong optical follow-up observations
  17. EP241217b/GRB 241217A: EP detection of the prompt X-ray emssion
  18. GRB 241218A: LCOGT Optical Upper Limit
  19. EP241217a: Global MASTER-Net observations report
  20. EP241217A: Non-detection from Fermi-GBM Observations
  21. GRB 241217A : SVOM/ECLAIRs,GRM,MXT detection of a long burst with a bright X-ray afterglow candidate
  22. GRB 241214A: GRBAlpha detection
  23. GRB 241213A (EP241213a): GRBAlpha detection
  24. GRB 241209D: GRBAlpha detection
  25. EP241217a: EP detection of an X-ray transient
  26. GRB 241213A: Swift-BAT refined analysis
  27. GRB 241214A: Swift/BAT-GUANO localization skymap of a burst
  28. Konus-Wind detection of GRB 241213A (EP 241213a)
  29. GRB 241215A: Mondy AZT-33IK optical observations
  30. GRB 241214A: SVOM/GRM observation
  31. GRB 241215A: GROWTH-India telescope optical upper limit
  32. GRB 241215A: A long GRB detected by INTEGRAL
  33. Integral GRB241215.58: Global MASTER-Net observations report
  34. GRB 241213B: Swift-XRT observations
  35. GRB 241209D: CALET Gamma-Ray Burst Monitor detection
  36. GRB 241209B: SVOM/VT optical continuous fading
  37. EP trigger ID 01709128824 is not a real source
  38. GRB 241213A: SVOM/VT optical candidate
  39. GRB 241212A: Fermi GBM detection
  40. GRB 241213A: LCOGT Optical Upper Limits
  41. EP 241208A : Detection of a long soft transient by SVOM/ECLAIRs
  42. EP241213a: EP detection of An X-ray Transient
  43. GRB 241213A: REM optical/NIR upper limits
  44. GRB241212A: OHP/T193 optical observations
  45. LIGO/Virgo/KAGRA S241210fu: Updated Sky localization
  46. Swift GRB 241213A: Global MASTER-Net observations report
  47. GRB 241212A : SVOM/C-GFT optical upper limit at early phase
  48. GRB 241212A: SVOM detection of a bright long burst
  49. GRB 241212A: Fermi GBM Final Real-time Localization
  50. GRB 241209A: Chandra X-ray Detection
  51. Konus-Wind detection of GRB 241209B
  52. GRB 241207A: EIRSAT-1 GMOD Detection
  53. GRB 241209B: GRBAlpha detection
  54. GRB 241206C: GRBAlpha detection
  55. LIGO/Virgo/KAGRA S241210cw: Updated Sky localization
  56. LIGO/Virgo/KAGRA S241210d: Updated Sky localization and EM Bright Classification
  57. GRB 241211A: Fermi GBM Final Real-time Localization
  58. GRB 241129A: Fermi GBM Observation
  59. GRB 241209B: Swift/BAT-GUANO localization skymap of a burst
  60. GRB 241209D: REM optical/NIR upper limits
  61. Konus-Wind detection of GRB 241209D
  62. GRB 241209B: Swift-XRT afterglow detection
  63. GRB 241209C: Fermi GBM Observation
  64. LIGO/Virgo/KAGRA S241210fu: Identification of a GW compact binary merger candidate
  65. GRB 241209A: EP-FXT follow-up observations
  66. GRB 241209B: SVOM/VT afterglow detection
  67. LIGO/Virgo/KAGRA S241210cw: Identification of a GW compact binary merger candidate
  68. EP241208a: Global MASTER-Net observations report
  69. EP241208a: EP-FXT follow-up observations
  70. LIGO/Virgo/KAGRA S241210d: Identification of a GW compact binary merger candidate
  71. Fermi trigger No 755485387: Global MASTER-Net observations report
  72. GRB 241207B: Fermi GBM Observation
  73. GRB 241209A: BOOTES-7 and 2.2m CAHA early optical upper limits
  74. GRB 241209D: Fermi GBM Observation
  75. GRB 241209A: VLT/HAWK-I near-IR counterpart candidate
  76. Fermi GRB 241209D: Global MASTER-Net observations report
  77. GRB 241209A: Fermi GBM Observation
  78. GRB 241209C: Swift/BAT-GUANO localization skymap of a burst
  79. Swift GRB 241209D: Global MASTER-Net observations report
  80. Fermi GRB 241209C: Global MASTER-Net observations report
  81. Fermi GRB 241209E: Global MASTER-Net observations report
  82. GRB 241209E: Fermi GBM Final Real-time Localization
  83. LIGO/Virgo/KAGRA S241102br: continued GRAWITA observations and detection of an optical transient (AT2024adip)
  84. GRB 241209A: REM optical/NIR observations
  85. GRB 241209D: Fermi GBM Final Real-time Localization
  86. GRB 241209A: VLT/X-shooter spectroscopy
  87. GRB 241114B: cubesat Avion detection
  88. GRB 241209A: VLT optical observations
  89. Fermi GRB 241209A: Global MASTER-Net observations report
  90. GRB 241209C: Fermi GBM Final Real-time Localization
  91. EP241206a: 1.5m OSN optical limit
  92. GRB 241209B: SVOM/ECLAIRs and GRM detection of a long burst
  93. Swift GRB241209.23: Global MASTER-Net observations report
  94. GRB 241209A: Fermi GBM Final Real-time Localization
  95. Fermi GRB 241207B: Global MASTER-Net observations report
  96. GRB 241207B: Swift/BAT-GUANO localization skymap of a short burst
  97. AT2024adec: X-ray Upper Limits from EP-FXT Observation
  98. EP241206a: BOOTES Global Network optical limits
  99. GRB 241207C: MASTER optical observations
  100. Fermi trigger No 755225799: Global MASTER-Net observations report

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov